Riverside City Council
May 20, 2025

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 0.50 0.95
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.10 2.10
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 1.100(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.100(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 74.8 0.305 0.730 0.105 1.000 0.105 Sum (F) = 0.105
Area averaged mean soil loss (F) (In/Hr) = 0.105
Minimum soil loss rate ((In/Hr)) = 0.052
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5500 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 87.719 10.710 0.206 2 0.167 175.439 52.537 1.011 3 0.250 263.158 21.572 0.415 4 0.333 350.877 8.833 0.170 5 0.417 438.596 3.926 0.076 6 0.500 526.316 1.230 0.024 7 0.583 614.035 0.656 0.013 8 0.667 701.754 0.537 0.010 Sum = 100.000 Sum= 1.925
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.30 0.436 0.105 ( 0.139) 0.331 2 0.17 4.20 0.554 0.105 ( 0.177) 0.450 3 0.25 4.40 0.581 0.105 ( 0.186) 0.476 4 0.33 4.80 0.634 0.105 ( 0.203) 0.529 5 0.42 5.20 0.686 0.105 ( 0.220) 0.582 6 0.50 6.20 0.818 0.105 ( 0.262) 0.714 7 0.58 6.80 0.898 0.105 ( 0.287) 0.793 8 0.67 8.80 1.162 0.105 ( 0.372) 1.057 9 0.75 13.90 1.835 0.105 ( 0.587) 1.730 10 0.83 31.40 4.145 0.105 ( 1.326) 4.040 11 0.92 7.20 0.950 0.105 ( 0.304) 0.846 12 1.00 3.80 0.502 0.105 ( 0.161) 0.397 (Loss Rate Not Used)
Sum = 100.0 Sum = 11.9 Flood volume = Effective rainfall 1.00(In)
times area 1.9(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.10(In)
Total soil loss = 0.017(Ac.Ft)
Total rainfall = 1.10(In)
Flood volume = 6900.3 Cubic Feet
Total soil loss = 726.2 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 5.250(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0005 0.07 Q | | | | 0+10 0.0034 0.43 VQ | | | | 0+15 0.0082 0.69 | Q | | | | 0+20 0.0139 0.83 | Q | | | | 0+25 0.0205 0.95 | Q V | | | | 0+30 0.0279 1.08 | Q V | | | | 0+35 0.0366 1.27 | Q V| | | | 0+40 0.0468 1.48 | Q |V | | | 0+45 0.0602 1.94 | Q | V | | | 0+50 0.0825 3.24 | | Q V | | 0+55 0.1187 5.25 | | |Q V| | 1+ 0 0.1395 3.02 | | Q | | V | 1+ 5 0.1506 1.61 | Q | | | V | 1+10 0.1553 0.68 | Q | | | V| 1+15 0.1570 0.26 |Q | | | V| PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 1+20 0.1579 0.12 Q | | | V| 1+25 0.1583 0.06 Q | | | V| 1+30 0.1584 0.01 Q | | | V| 1+35 0.1584 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1a24100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
DMA A
Kimley-Horn
100 yr
-------------------------------------------------------------------- Drainage Area = 1.91(Ac.) = 0.003 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.60 3.06
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 4.00 7.64
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 4.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 4.000(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 74.8 0.305 0.730 0.105 1.000 0.105 Sum (F) = 0.105
Area averaged mean soil loss (F) (In/Hr) = 0.105
Minimum soil loss rate ((In/Hr)) = 0.052
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 87.719 10.710 0.206 2 0.167 175.439 52.537 1.011 3 0.250 263.158 21.572 0.415 4 0.333 350.877 8.833 0.170 5 0.417 438.596 3.926 0.076 6 0.500 526.316 1.230 0.024 7 0.583 614.035 0.656 0.013 8 0.667 701.754 0.537 0.010 Sum = 100.000 Sum= 1.925
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.032 ( 0.186) 0.010 0.022 2 0.17 0.07 0.032 ( 0.185) 0.010 0.022 3 0.25 0.07 0.032 ( 0.184) 0.010 0.022 4 0.33 0.10 0.048 ( 0.184) 0.015 0.033 5 0.42 0.10 0.048 ( 0.183) 0.015 0.033 6 0.50 0.10 0.048 ( 0.182) 0.015 0.033 7 0.58 0.10 0.048 ( 0.181) 0.015 0.033 8 0.67 0.10 0.048 ( 0.181) 0.015 0.033 9 0.75 0.10 0.048 ( 0.180) 0.015 0.033 10 0.83 0.13 0.064 ( 0.179) 0.020 0.044 11 0.92 0.13 0.064 ( 0.179) 0.020 0.044 12 1.00 0.13 0.064 ( 0.178) 0.020 0.044 13 1.08 0.10 0.048 ( 0.177) 0.015 0.033 14 1.17 0.10 0.048 ( 0.176) 0.015 0.033 15 1.25 0.10 0.048 ( 0.176) 0.015 0.033 16 1.33 0.10 0.048 ( 0.175) 0.015 0.033 17 1.42 0.10 0.048 ( 0.174) 0.015 0.033 18 1.50 0.10 0.048 ( 0.174) 0.015 0.033 19 1.58 0.10 0.048 ( 0.173) 0.015 0.033 20 1.67 0.10 0.048 ( 0.172) 0.015 0.033 21 1.75 0.10 0.048 ( 0.172) 0.015 0.033 22 1.83 0.13 0.064 ( 0.171) 0.020 0.044 23 1.92 0.13 0.064 ( 0.170) 0.020 0.044 24 2.00 0.13 0.064 ( 0.170) 0.020 0.044 25 2.08 0.13 0.064 ( 0.169) 0.020 0.044 26 2.17 0.13 0.064 ( 0.168) 0.020 0.044 27 2.25 0.13 0.064 ( 0.167) 0.020 0.044 28 2.33 0.13 0.064 ( 0.167) 0.020 0.044 29 2.42 0.13 0.064 ( 0.166) 0.020 0.044 30 2.50 0.13 0.064 ( 0.165) 0.020 0.044 31 2.58 0.17 0.080 ( 0.165) 0.026 0.054 32 2.67 0.17 0.080 ( 0.164) 0.026 0.054 33 2.75 0.17 0.080 ( 0.163) 0.026 0.054 34 2.83 0.17 0.080 ( 0.163) 0.026 0.054 35 2.92 0.17 0.080 ( 0.162) 0.026 0.054 36 3.00 0.17 0.080 ( 0.161) 0.026 0.054 37 3.08 0.17 0.080 ( 0.161) 0.026 0.054 38 3.17 0.17 0.080 ( 0.160) 0.026 0.054 39 3.25 0.17 0.080 ( 0.159) 0.026 0.054 40 3.33 0.17 0.080 ( 0.159) 0.026 0.054 41 3.42 0.17 0.080 ( 0.158) 0.026 0.054 42 3.50 0.17 0.080 ( 0.157) 0.026 0.054 43 3.58 0.17 0.080 ( 0.157) 0.026 0.054 44 3.67 0.17 0.080 ( 0.156) 0.026 0.054 45 3.75 0.17 0.080 ( 0.155) 0.026 0.054 46 3.83 0.20 0.096 ( 0.155) 0.031 0.065 47 3.92 0.20 0.096 ( 0.154) 0.031 0.065 48 4.00 0.20 0.096 ( 0.153) 0.031 0.065 49 4.08 0.20 0.096 ( 0.153) 0.031 0.065 50 4.17 0.20 0.096 ( 0.152) 0.031 0.065 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 51 4.25 0.20 0.096 ( 0.152) 0.031 0.065 52 4.33 0.23 0.112 ( 0.151) 0.036 0.076 53 4.42 0.23 0.112 ( 0.150) 0.036 0.076 54 4.50 0.23 0.112 ( 0.150) 0.036 0.076 55 4.58 0.23 0.112 ( 0.149) 0.036 0.076 56 4.67 0.23 0.112 ( 0.148) 0.036 0.076 57 4.75 0.23 0.112 ( 0.148) 0.036 0.076 58 4.83 0.27 0.128 ( 0.147) 0.041 0.087 59 4.92 0.27 0.128 ( 0.146) 0.041 0.087 60 5.00 0.27 0.128 ( 0.146) 0.041 0.087 61 5.08 0.20 0.096 ( 0.145) 0.031 0.065 62 5.17 0.20 0.096 ( 0.144) 0.031 0.065 63 5.25 0.20 0.096 ( 0.144) 0.031 0.065 64 5.33 0.23 0.112 ( 0.143) 0.036 0.076 65 5.42 0.23 0.112 ( 0.143) 0.036 0.076 66 5.50 0.23 0.112 ( 0.142) 0.036 0.076 67 5.58 0.27 0.128 ( 0.141) 0.041 0.087 68 5.67 0.27 0.128 ( 0.141) 0.041 0.087 69 5.75 0.27 0.128 ( 0.140) 0.041 0.087 70 5.83 0.27 0.128 ( 0.139) 0.041 0.087 71 5.92 0.27 0.128 ( 0.139) 0.041 0.087 72 6.00 0.27 0.128 ( 0.138) 0.041 0.087 73 6.08 0.30 0.144 ( 0.138) 0.046 0.098 74 6.17 0.30 0.144 ( 0.137) 0.046 0.098 75 6.25 0.30 0.144 ( 0.136) 0.046 0.098 76 6.33 0.30 0.144 ( 0.136) 0.046 0.098 77 6.42 0.30 0.144 ( 0.135) 0.046 0.098 78 6.50 0.30 0.144 ( 0.135) 0.046 0.098 79 6.58 0.33 0.160 ( 0.134) 0.051 0.109 80 6.67 0.33 0.160 ( 0.133) 0.051 0.109 81 6.75 0.33 0.160 ( 0.133) 0.051 0.109 82 6.83 0.33 0.160 ( 0.132) 0.051 0.109 83 6.92 0.33 0.160 ( 0.132) 0.051 0.109 84 7.00 0.33 0.160 ( 0.131) 0.051 0.109 85 7.08 0.33 0.160 ( 0.130) 0.051 0.109 86 7.17 0.33 0.160 ( 0.130) 0.051 0.109 87 7.25 0.33 0.160 ( 0.129) 0.051 0.109 88 7.33 0.37 0.176 ( 0.129) 0.056 0.120 89 7.42 0.37 0.176 ( 0.128) 0.056 0.120 90 7.50 0.37 0.176 ( 0.127) 0.056 0.120 91 7.58 0.40 0.192 ( 0.127) 0.061 0.131 92 7.67 0.40 0.192 ( 0.126) 0.061 0.131 93 7.75 0.40 0.192 ( 0.126) 0.061 0.131 94 7.83 0.43 0.208 ( 0.125) 0.067 0.141 95 7.92 0.43 0.208 ( 0.125) 0.067 0.141 96 8.00 0.43 0.208 ( 0.124) 0.067 0.141 97 8.08 0.50 0.240 ( 0.123) 0.077 0.163 98 8.17 0.50 0.240 ( 0.123) 0.077 0.163 99 8.25 0.50 0.240 ( 0.122) 0.077 0.163 100 8.33 0.50 0.240 ( 0.122) 0.077 0.163 101 8.42 0.50 0.240 ( 0.121) 0.077 0.163 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 102 8.50 0.50 0.240 ( 0.121) 0.077 0.163 103 8.58 0.53 0.256 ( 0.120) 0.082 0.174 104 8.67 0.53 0.256 ( 0.119) 0.082 0.174 105 8.75 0.53 0.256 ( 0.119) 0.082 0.174 106 8.83 0.57 0.272 ( 0.118) 0.087 0.185 107 8.92 0.57 0.272 ( 0.118) 0.087 0.185 108 9.00 0.57 0.272 ( 0.117) 0.087 0.185 109 9.08 0.63 0.304 ( 0.117) 0.097 0.207 110 9.17 0.63 0.304 ( 0.116) 0.097 0.207 111 9.25 0.63 0.304 ( 0.115) 0.097 0.207 112 9.33 0.67 0.320 ( 0.115) 0.102 0.218 113 9.42 0.67 0.320 ( 0.114) 0.102 0.218 114 9.50 0.67 0.320 ( 0.114) 0.102 0.218 115 9.58 0.70 0.336 ( 0.113) 0.108 0.228 116 9.67 0.70 0.336 ( 0.113) 0.108 0.228 117 9.75 0.70 0.336 ( 0.112) 0.108 0.228 118 9.83 0.73 0.352 0.112 ( 0.113) 0.240 119 9.92 0.73 0.352 0.111 ( 0.113) 0.241 120 10.00 0.73 0.352 0.111 ( 0.113) 0.241 121 10.08 0.50 0.240 ( 0.110) 0.077 0.163 122 10.17 0.50 0.240 ( 0.110) 0.077 0.163 123 10.25 0.50 0.240 ( 0.109) 0.077 0.163 124 10.33 0.50 0.240 ( 0.108) 0.077 0.163 125 10.42 0.50 0.240 ( 0.108) 0.077 0.163 126 10.50 0.50 0.240 ( 0.107) 0.077 0.163 127 10.58 0.67 0.320 ( 0.107) 0.102 0.218 128 10.67 0.67 0.320 ( 0.106) 0.102 0.218 129 10.75 0.67 0.320 ( 0.106) 0.102 0.218 130 10.83 0.67 0.320 ( 0.105) 0.102 0.218 131 10.92 0.67 0.320 ( 0.105) 0.102 0.218 132 11.00 0.67 0.320 ( 0.104) 0.102 0.218 133 11.08 0.63 0.304 ( 0.104) 0.097 0.207 134 11.17 0.63 0.304 ( 0.103) 0.097 0.207 135 11.25 0.63 0.304 ( 0.103) 0.097 0.207 136 11.33 0.63 0.304 ( 0.102) 0.097 0.207 137 11.42 0.63 0.304 ( 0.102) 0.097 0.207 138 11.50 0.63 0.304 ( 0.101) 0.097 0.207 139 11.58 0.57 0.272 ( 0.101) 0.087 0.185 140 11.67 0.57 0.272 ( 0.100) 0.087 0.185 141 11.75 0.57 0.272 ( 0.100) 0.087 0.185 142 11.83 0.60 0.288 ( 0.099) 0.092 0.196 143 11.92 0.60 0.288 ( 0.099) 0.092 0.196 144 12.00 0.60 0.288 ( 0.098) 0.092 0.196 145 12.08 0.83 0.400 0.098 ( 0.128) 0.302 146 12.17 0.83 0.400 0.097 ( 0.128) 0.303 147 12.25 0.83 0.400 0.097 ( 0.128) 0.303 148 12.33 0.87 0.416 0.096 ( 0.133) 0.320 149 12.42 0.87 0.416 0.096 ( 0.133) 0.320 150 12.50 0.87 0.416 0.095 ( 0.133) 0.321 151 12.58 0.93 0.448 0.095 ( 0.143) 0.353 152 12.67 0.93 0.448 0.094 ( 0.143) 0.354 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 153 12.75 0.93 0.448 0.094 ( 0.143) 0.354 154 12.83 0.97 0.464 0.093 ( 0.148) 0.371 155 12.92 0.97 0.464 0.093 ( 0.148) 0.371 156 13.00 0.97 0.464 0.092 ( 0.148) 0.372 157 13.08 1.13 0.544 0.092 ( 0.174) 0.452 158 13.17 1.13 0.544 0.092 ( 0.174) 0.452 159 13.25 1.13 0.544 0.091 ( 0.174) 0.453 160 13.33 1.13 0.544 0.091 ( 0.174) 0.453 161 13.42 1.13 0.544 0.090 ( 0.174) 0.454 162 13.50 1.13 0.544 0.090 ( 0.174) 0.454 163 13.58 0.77 0.368 0.089 ( 0.118) 0.279 164 13.67 0.77 0.368 0.089 ( 0.118) 0.279 165 13.75 0.77 0.368 0.088 ( 0.118) 0.280 166 13.83 0.77 0.368 0.088 ( 0.118) 0.280 167 13.92 0.77 0.368 0.087 ( 0.118) 0.281 168 14.00 0.77 0.368 0.087 ( 0.118) 0.281 169 14.08 0.90 0.432 0.087 ( 0.138) 0.345 170 14.17 0.90 0.432 0.086 ( 0.138) 0.346 171 14.25 0.90 0.432 0.086 ( 0.138) 0.346 172 14.33 0.87 0.416 0.085 ( 0.133) 0.331 173 14.42 0.87 0.416 0.085 ( 0.133) 0.331 174 14.50 0.87 0.416 0.084 ( 0.133) 0.332 175 14.58 0.87 0.416 0.084 ( 0.133) 0.332 176 14.67 0.87 0.416 0.084 ( 0.133) 0.332 177 14.75 0.87 0.416 0.083 ( 0.133) 0.333 178 14.83 0.83 0.400 0.083 ( 0.128) 0.317 179 14.92 0.83 0.400 0.082 ( 0.128) 0.318 180 15.00 0.83 0.400 0.082 ( 0.128) 0.318 181 15.08 0.80 0.384 0.081 ( 0.123) 0.303 182 15.17 0.80 0.384 0.081 ( 0.123) 0.303 183 15.25 0.80 0.384 0.081 ( 0.123) 0.303 184 15.33 0.77 0.368 0.080 ( 0.118) 0.288 185 15.42 0.77 0.368 0.080 ( 0.118) 0.288 186 15.50 0.77 0.368 0.079 ( 0.118) 0.289 187 15.58 0.63 0.304 0.079 ( 0.097) 0.225 188 15.67 0.63 0.304 0.079 ( 0.097) 0.225 189 15.75 0.63 0.304 0.078 ( 0.097) 0.226 190 15.83 0.63 0.304 0.078 ( 0.097) 0.226 191 15.92 0.63 0.304 0.077 ( 0.097) 0.227 192 16.00 0.63 0.304 0.077 ( 0.097) 0.227 193 16.08 0.13 0.064 ( 0.077) 0.020 0.044 194 16.17 0.13 0.064 ( 0.076) 0.020 0.044 195 16.25 0.13 0.064 ( 0.076) 0.020 0.044 196 16.33 0.13 0.064 ( 0.075) 0.020 0.044 197 16.42 0.13 0.064 ( 0.075) 0.020 0.044 198 16.50 0.13 0.064 ( 0.075) 0.020 0.044 199 16.58 0.10 0.048 ( 0.074) 0.015 0.033 200 16.67 0.10 0.048 ( 0.074) 0.015 0.033 201 16.75 0.10 0.048 ( 0.073) 0.015 0.033 202 16.83 0.10 0.048 ( 0.073) 0.015 0.033 203 16.92 0.10 0.048 ( 0.073) 0.015 0.033 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 204 17.00 0.10 0.048 ( 0.072) 0.015 0.033 205 17.08 0.17 0.080 ( 0.072) 0.026 0.054 206 17.17 0.17 0.080 ( 0.072) 0.026 0.054 207 17.25 0.17 0.080 ( 0.071) 0.026 0.054 208 17.33 0.17 0.080 ( 0.071) 0.026 0.054 209 17.42 0.17 0.080 ( 0.071) 0.026 0.054 210 17.50 0.17 0.080 ( 0.070) 0.026 0.054 211 17.58 0.17 0.080 ( 0.070) 0.026 0.054 212 17.67 0.17 0.080 ( 0.069) 0.026 0.054 213 17.75 0.17 0.080 ( 0.069) 0.026 0.054 214 17.83 0.13 0.064 ( 0.069) 0.020 0.044 215 17.92 0.13 0.064 ( 0.068) 0.020 0.044 216 18.00 0.13 0.064 ( 0.068) 0.020 0.044 217 18.08 0.13 0.064 ( 0.068) 0.020 0.044 218 18.17 0.13 0.064 ( 0.067) 0.020 0.044 219 18.25 0.13 0.064 ( 0.067) 0.020 0.044 220 18.33 0.13 0.064 ( 0.067) 0.020 0.044 221 18.42 0.13 0.064 ( 0.066) 0.020 0.044 222 18.50 0.13 0.064 ( 0.066) 0.020 0.044 223 18.58 0.10 0.048 ( 0.066) 0.015 0.033 224 18.67 0.10 0.048 ( 0.066) 0.015 0.033 225 18.75 0.10 0.048 ( 0.065) 0.015 0.033 226 18.83 0.07 0.032 ( 0.065) 0.010 0.022 227 18.92 0.07 0.032 ( 0.065) 0.010 0.022 228 19.00 0.07 0.032 ( 0.064) 0.010 0.022 229 19.08 0.10 0.048 ( 0.064) 0.015 0.033 230 19.17 0.10 0.048 ( 0.064) 0.015 0.033 231 19.25 0.10 0.048 ( 0.063) 0.015 0.033 232 19.33 0.13 0.064 ( 0.063) 0.020 0.044 233 19.42 0.13 0.064 ( 0.063) 0.020 0.044 234 19.50 0.13 0.064 ( 0.062) 0.020 0.044 235 19.58 0.10 0.048 ( 0.062) 0.015 0.033 236 19.67 0.10 0.048 ( 0.062) 0.015 0.033 237 19.75 0.10 0.048 ( 0.062) 0.015 0.033 238 19.83 0.07 0.032 ( 0.061) 0.010 0.022 239 19.92 0.07 0.032 ( 0.061) 0.010 0.022 240 20.00 0.07 0.032 ( 0.061) 0.010 0.022 241 20.08 0.10 0.048 ( 0.061) 0.015 0.033 242 20.17 0.10 0.048 ( 0.060) 0.015 0.033 243 20.25 0.10 0.048 ( 0.060) 0.015 0.033 244 20.33 0.10 0.048 ( 0.060) 0.015 0.033 245 20.42 0.10 0.048 ( 0.060) 0.015 0.033 246 20.50 0.10 0.048 ( 0.059) 0.015 0.033 247 20.58 0.10 0.048 ( 0.059) 0.015 0.033 248 20.67 0.10 0.048 ( 0.059) 0.015 0.033 249 20.75 0.10 0.048 ( 0.059) 0.015 0.033 250 20.83 0.07 0.032 ( 0.058) 0.010 0.022 251 20.92 0.07 0.032 ( 0.058) 0.010 0.022 252 21.00 0.07 0.032 ( 0.058) 0.010 0.022 253 21.08 0.10 0.048 ( 0.058) 0.015 0.033 254 21.17 0.10 0.048 ( 0.057) 0.015 0.033 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 255 21.25 0.10 0.048 ( 0.057) 0.015 0.033 256 21.33 0.07 0.032 ( 0.057) 0.010 0.022 257 21.42 0.07 0.032 ( 0.057) 0.010 0.022 258 21.50 0.07 0.032 ( 0.056) 0.010 0.022 259 21.58 0.10 0.048 ( 0.056) 0.015 0.033 260 21.67 0.10 0.048 ( 0.056) 0.015 0.033 261 21.75 0.10 0.048 ( 0.056) 0.015 0.033 262 21.83 0.07 0.032 ( 0.056) 0.010 0.022 263 21.92 0.07 0.032 ( 0.055) 0.010 0.022 264 22.00 0.07 0.032 ( 0.055) 0.010 0.022 265 22.08 0.10 0.048 ( 0.055) 0.015 0.033 266 22.17 0.10 0.048 ( 0.055) 0.015 0.033 267 22.25 0.10 0.048 ( 0.055) 0.015 0.033 268 22.33 0.07 0.032 ( 0.055) 0.010 0.022 269 22.42 0.07 0.032 ( 0.054) 0.010 0.022 270 22.50 0.07 0.032 ( 0.054) 0.010 0.022 271 22.58 0.07 0.032 ( 0.054) 0.010 0.022 272 22.67 0.07 0.032 ( 0.054) 0.010 0.022 273 22.75 0.07 0.032 ( 0.054) 0.010 0.022 274 22.83 0.07 0.032 ( 0.054) 0.010 0.022 275 22.92 0.07 0.032 ( 0.054) 0.010 0.022 276 23.00 0.07 0.032 ( 0.053) 0.010 0.022 277 23.08 0.07 0.032 ( 0.053) 0.010 0.022 278 23.17 0.07 0.032 ( 0.053) 0.010 0.022 279 23.25 0.07 0.032 ( 0.053) 0.010 0.022 280 23.33 0.07 0.032 ( 0.053) 0.010 0.022 281 23.42 0.07 0.032 ( 0.053) 0.010 0.022 282 23.50 0.07 0.032 ( 0.053) 0.010 0.022 283 23.58 0.07 0.032 ( 0.053) 0.010 0.022 284 23.67 0.07 0.032 ( 0.053) 0.010 0.022 285 23.75 0.07 0.032 ( 0.053) 0.010 0.022 286 23.83 0.07 0.032 ( 0.052) 0.010 0.022 287 23.92 0.07 0.032 ( 0.052) 0.010 0.022 288 24.00 0.07 0.032 ( 0.052) 0.010 0.022 (Loss Rate Not Used)
Sum = 100.0 Sum = 34.8 Flood volume = Effective rainfall 2.90(In)
times area 1.9(Ac.)/[(In)/(Ft.)] = 0.5(Ac.Ft) Total soil loss = 1.10(In)
Total soil loss = 0.175(Ac.Ft)
Total rainfall = 4.00(In)
Flood volume = 20096.5 Cubic Feet
Total soil loss = 7636.6 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.872(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0002 0.03 Q | | | | 0+15 0.0005 0.04 Q | | | | 0+20 0.0007 0.04 Q | | | | 0+25 0.0011 0.05 Q | | | | 0+30 0.0015 0.06 Q | | | | 0+35 0.0019 0.06 Q | | | | 0+40 0.0024 0.06 Q | | | | 0+45 0.0028 0.06 Q | | | | 0+50 0.0033 0.06 Q | | | | 0+55 0.0038 0.08 Q | | | | 1+ 0 0.0043 0.08 Q | | | | 1+ 5 0.0049 0.08 Q | | | | 1+10 0.0054 0.07 Q | | | | 1+15 0.0058 0.07 Q | | | | 1+20 0.0063 0.06 Q | | | | 1+25 0.0067 0.06 Q | | | | 1+30 0.0071 0.06 Q | | | | 1+35 0.0076 0.06 Q | | | | 1+40 0.0080 0.06 Q | | | | 1+45 0.0084 0.06 Q | | | | 1+50 0.0089 0.07 Q | | | | 1+55 0.0094 0.08 Q | | | | 2+ 0 0.0100 0.08 Q | | | | 2+ 5 0.0105 0.08 Q | | | | 2+10 0.0111 0.08 Q | | | | 2+15 0.0117 0.08 QV | | | | 2+20 0.0123 0.08 QV | | | | 2+25 0.0128 0.08 QV | | | | 2+30 0.0134 0.08 QV | | | | 2+35 0.0140 0.09 QV | | | | 2+40 0.0147 0.10 QV | | | | 2+45 0.0154 0.10 QV | | | | 2+50 0.0161 0.10 QV | | | | 2+55 0.0168 0.10 QV | | | | 3+ 0 0.0175 0.10 QV | | | | 3+ 5 0.0182 0.10 QV | | | | 3+10 0.0190 0.10 QV | | | | 3+15 0.0197 0.10 QV | | | | 3+20 0.0204 0.10 QV | | | | 3+25 0.0211 0.10 QV | | | | 3+30 0.0219 0.10 QV | | | | 3+35 0.0226 0.10 QV | | | | 3+40 0.0233 0.10 Q V | | | | 3+45 0.0240 0.10 Q V | | | | 3+50 0.0248 0.11 Q V | | | | 3+55 0.0256 0.12 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+ 0 0.0264 0.12 Q V | | | | 4+ 5 0.0273 0.12 Q V | | | | 4+10 0.0281 0.13 Q V | | | | 4+15 0.0290 0.13 Q V | | | | 4+20 0.0299 0.13 Q V | | | | 4+25 0.0308 0.14 Q V | | | | 4+30 0.0318 0.14 Q V | | | | 4+35 0.0328 0.15 Q V | | | | 4+40 0.0338 0.15 Q V | | | | 4+45 0.0348 0.15 Q V | | | | 4+50 0.0359 0.15 Q V | | | | 4+55 0.0370 0.16 Q V | | | | 5+ 0 0.0381 0.16 Q V | | | | 5+ 5 0.0392 0.16 Q V | | | | 5+10 0.0402 0.14 Q V | | | | 5+15 0.0411 0.13 Q V | | | | 5+20 0.0420 0.13 Q V | | | | 5+25 0.0429 0.14 Q V | | | | 5+30 0.0439 0.14 Q V | | | | 5+35 0.0450 0.15 Q V | | | | 5+40 0.0461 0.16 Q V | | | | 5+45 0.0472 0.16 Q V | | | | 5+50 0.0483 0.17 Q V | | | | 5+55 0.0495 0.17 Q V | | | | 6+ 0 0.0506 0.17 Q V | | | | 6+ 5 0.0518 0.17 Q V | | | | 6+10 0.0530 0.18 Q V | | | | 6+15 0.0543 0.19 Q V | | | | 6+20 0.0556 0.19 Q V | | | | 6+25 0.0569 0.19 Q V | | | | 6+30 0.0582 0.19 Q V | | | | 6+35 0.0595 0.19 Q V | | | | 6+40 0.0609 0.20 Q V | | | | 6+45 0.0623 0.21 Q V | | | | 6+50 0.0638 0.21 Q V | | | | 6+55 0.0652 0.21 Q V | | | | 7+ 0 0.0666 0.21 Q V | | | | 7+ 5 0.0681 0.21 Q V | | | | 7+10 0.0695 0.21 Q V | | | | 7+15 0.0710 0.21 Q V | | | | 7+20 0.0724 0.21 Q V | | | | 7+25 0.0740 0.22 Q V | | | | 7+30 0.0755 0.23 Q V | | | | 7+35 0.0771 0.23 Q V | | | | 7+40 0.0788 0.24 Q V | | | | 7+45 0.0805 0.25 Q V | | | | 7+50 0.0822 0.25 |Q V | | | | 7+55 0.0841 0.26 |Q V | | | | 8+ 0 0.0859 0.27 |Q V | | | | 8+ 5 0.0878 0.28 |Q V | | | | 8+10 0.0899 0.30 |Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+15 0.0920 0.31 |Q V | | | | 8+20 0.0941 0.31 |Q V | | | | 8+25 0.0963 0.31 |Q V | | | | 8+30 0.0985 0.31 |Q V | | | | 8+35 0.1006 0.32 |Q V | | | | 8+40 0.1029 0.33 |Q V | | | | 8+45 0.1052 0.33 |Q V| | | | 8+50 0.1075 0.34 |Q V| | | | 8+55 0.1099 0.35 |Q V| | | | 9+ 0 0.1123 0.35 |Q V| | | | 9+ 5 0.1148 0.36 |Q V| | | | 9+10 0.1174 0.38 |Q V | | | 9+15 0.1201 0.39 |Q V | | | 9+20 0.1229 0.40 |Q V | | | 9+25 0.1257 0.41 |Q V | | | 9+30 0.1285 0.42 |Q |V | | | 9+35 0.1314 0.42 |Q |V | | | 9+40 0.1344 0.43 |Q |V | | | 9+45 0.1374 0.44 |Q |V | | | 9+50 0.1405 0.44 |Q | V | | | 9+55 0.1436 0.45 |Q | V | | | 10+ 0 0.1468 0.46 |Q | V | | | 10+ 5 0.1498 0.45 |Q | V | | | 10+10 0.1524 0.37 |Q | V | | | 10+15 0.1547 0.34 |Q | V | | | 10+20 0.1569 0.32 |Q | V | | | 10+25 0.1591 0.32 |Q | V | | | 10+30 0.1613 0.32 |Q | V | | | 10+35 0.1635 0.33 |Q | V | | | 10+40 0.1662 0.38 |Q | V | | | 10+45 0.1689 0.40 |Q | V | | | 10+50 0.1718 0.41 |Q | V | | | 10+55 0.1746 0.42 |Q | V | | | 11+ 0 0.1775 0.42 |Q | V | | | 11+ 5 0.1804 0.42 |Q | V | | | 11+10 0.1832 0.41 |Q | V | | | 11+15 0.1859 0.40 |Q | V | | | 11+20 0.1887 0.40 |Q | V | | | 11+25 0.1914 0.40 |Q | V | | | 11+30 0.1942 0.40 |Q | V | | | 11+35 0.1969 0.39 |Q | V | | | 11+40 0.1995 0.37 |Q | V | | | 11+45 0.2019 0.36 |Q | V | | | 11+50 0.2044 0.36 |Q | V | | | 11+55 0.2070 0.37 |Q | V | | | 12+ 0 0.2096 0.37 |Q | V | | | 12+ 5 0.2123 0.40 |Q | V | | | 12+10 0.2158 0.51 | Q | V | | | 12+15 0.2196 0.55 | Q | V| | | 12+20 0.2235 0.57 | Q | V| | | 12+25 0.2277 0.60 | Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+30 0.2319 0.61 | Q | V | | 12+35 0.2361 0.62 | Q | V | | 12+40 0.2407 0.66 | Q | V | | 12+45 0.2453 0.67 | Q | |V | | 12+50 0.2500 0.68 | Q | |V | | 12+55 0.2548 0.70 | Q | | V | | 13+ 0 0.2597 0.71 | Q | | V | | 13+ 5 0.2647 0.73 | Q | | V | | 13+10 0.2703 0.81 | Q | | V | | 13+15 0.2761 0.85 | Q | | V | | 13+20 0.2821 0.86 | Q | | V | | 13+25 0.2880 0.87 | Q | | V | | 13+30 0.2940 0.87 | Q | | V | | 13+35 0.2998 0.84 | Q | | V | | 13+40 0.3044 0.66 | Q | | V | | 13+45 0.3084 0.59 | Q | | V | | 13+50 0.3123 0.56 | Q | | V | | 13+55 0.3160 0.55 | Q | | V | | 14+ 0 0.3198 0.54 | Q | | V | | 14+ 5 0.3236 0.56 | Q | | V | | 14+10 0.3279 0.62 | Q | | V | | 14+15 0.3323 0.65 | Q | | V | | 14+20 0.3369 0.66 | Q | | V| | 14+25 0.3413 0.64 | Q | | V| | 14+30 0.3457 0.64 | Q | | V| | 14+35 0.3501 0.64 | Q | | V | 14+40 0.3545 0.64 | Q | | V | 14+45 0.3589 0.64 | Q | | |V | 14+50 0.3633 0.64 | Q | | |V | 14+55 0.3676 0.62 | Q | | |V | 15+ 0 0.3718 0.62 | Q | | | V | 15+ 5 0.3761 0.61 | Q | | | V | 15+10 0.3802 0.59 | Q | | | V | 15+15 0.3842 0.59 | Q | | | V | 15+20 0.3882 0.58 | Q | | | V | 15+25 0.3921 0.57 | Q | | | V | 15+30 0.3960 0.56 | Q | | | V | 15+35 0.3997 0.54 | Q | | | V | 15+40 0.4030 0.48 |Q | | | V | 15+45 0.4061 0.45 |Q | | | V | 15+50 0.4092 0.44 |Q | | | V | 15+55 0.4122 0.44 |Q | | | V | 16+ 0 0.4152 0.44 |Q | | | V | 16+ 5 0.4180 0.40 |Q | | | V | 16+10 0.4194 0.21 Q | | | V | 16+15 0.4204 0.14 Q | | | V | 16+20 0.4211 0.11 Q | | | V | 16+25 0.4218 0.09 Q | | | V | 16+30 0.4224 0.09 Q | | | V | 16+35 0.4229 0.08 Q | | | V | 16+40 0.4234 0.07 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+45 0.4239 0.07 Q | | | V | 16+50 0.4243 0.06 Q | | | V | 16+55 0.4248 0.06 Q | | | V | 17+ 0 0.4252 0.06 Q | | | V | 17+ 5 0.4257 0.07 Q | | | V | 17+10 0.4263 0.09 Q | | | V | 17+15 0.4270 0.10 Q | | | V | 17+20 0.4277 0.10 Q | | | V | 17+25 0.4284 0.10 Q | | | V | 17+30 0.4291 0.10 Q | | | V | 17+35 0.4298 0.10 Q | | | V | 17+40 0.4305 0.10 Q | | | V | 17+45 0.4313 0.10 Q | | | V | 17+50 0.4320 0.10 Q | | | V | 17+55 0.4326 0.09 Q | | | V | 18+ 0 0.4332 0.09 Q | | | V | 18+ 5 0.4338 0.09 Q | | | V | 18+10 0.4344 0.08 Q | | | V | 18+15 0.4349 0.08 Q | | | V | 18+20 0.4355 0.08 Q | | | V | 18+25 0.4361 0.08 Q | | | V | 18+30 0.4367 0.08 Q | | | V | 18+35 0.4372 0.08 Q | | | V | 18+40 0.4377 0.07 Q | | | V | 18+45 0.4382 0.07 Q | | | V | 18+50 0.4386 0.06 Q | | | V | 18+55 0.4389 0.05 Q | | | V | 19+ 0 0.4393 0.05 Q | | | V | 19+ 5 0.4396 0.05 Q | | | V | 19+10 0.4399 0.06 Q | | | V | 19+15 0.4404 0.06 Q | | | V | 19+20 0.4408 0.06 Q | | | V | 19+25 0.4413 0.08 Q | | | V | 19+30 0.4419 0.08 Q | | | V | 19+35 0.4424 0.08 Q | | | V | 19+40 0.4429 0.07 Q | | | V | 19+45 0.4434 0.07 Q | | | V | 19+50 0.4438 0.06 Q | | | V | 19+55 0.4441 0.05 Q | | | V | 20+ 0 0.4444 0.05 Q | | | V | 20+ 5 0.4448 0.05 Q | | | V | 20+10 0.4451 0.06 Q | | | V | 20+15 0.4456 0.06 Q | | | V | 20+20 0.4460 0.06 Q | | | V | 20+25 0.4464 0.06 Q | | | V | 20+30 0.4468 0.06 Q | | | V | 20+35 0.4473 0.06 Q | | | V | 20+40 0.4477 0.06 Q | | | V | 20+45 0.4481 0.06 Q | | | V | 20+50 0.4486 0.06 Q | | | V | 20+55 0.4489 0.05 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 21+ 0 0.4492 0.05 Q | | | V | 21+ 5 0.4495 0.05 Q | | | V | 21+10 0.4499 0.06 Q | | | V| 21+15 0.4503 0.06 Q | | | V| 21+20 0.4507 0.06 Q | | | V| 21+25 0.4511 0.05 Q | | | V| 21+30 0.4514 0.04 Q | | | V| 21+35 0.4517 0.05 Q | | | V| 21+40 0.4521 0.06 Q | | | V| 21+45 0.4525 0.06 Q | | | V| 21+50 0.4529 0.06 Q | | | V| 21+55 0.4532 0.05 Q | | | V| 22+ 0 0.4535 0.04 Q | | | V| 22+ 5 0.4539 0.05 Q | | | V| 22+10 0.4542 0.06 Q | | | V| 22+15 0.4546 0.06 Q | | | V| 22+20 0.4551 0.06 Q | | | V| 22+25 0.4554 0.05 Q | | | V| 22+30 0.4557 0.04 Q | | | V| 22+35 0.4560 0.04 Q | | | V| 22+40 0.4563 0.04 Q | | | V| 22+45 0.4566 0.04 Q | | | V| 22+50 0.4569 0.04 Q | | | V| 22+55 0.4572 0.04 Q | | | V| 23+ 0 0.4575 0.04 Q | | | V| 23+ 5 0.4577 0.04 Q | | | V| 23+10 0.4580 0.04 Q | | | V| 23+15 0.4583 0.04 Q | | | V| 23+20 0.4586 0.04 Q | | | V| 23+25 0.4589 0.04 Q | | | V| 23+30 0.4592 0.04 Q | | | V| 23+35 0.4595 0.04 Q | | | V| 23+40 0.4598 0.04 Q | | | V| 23+45 0.4600 0.04 Q | | | V| 23+50 0.4603 0.04 Q | | | V| 23+55 0.4606 0.04 Q | | | V| 24+ 0 0.4609 0.04 Q | | | V| 24+ 5 0.4612 0.04 Q | | | V| 24+10 0.4613 0.02 Q | | | V| 24+15 0.4613 0.01 Q | | | V| 24+20 0.4613 0.00 Q | | | V| 24+25 0.4613 0.00 Q | | | V| 24+30 0.4613 0.00 Q | | | V| 24+35 0.4614 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b12.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
2 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.50 0.67
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.10 1.47
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.500(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.500(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5500 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.30 0.198 ( 0.191) 0.063 0.135 2 0.17 4.20 0.252 ( 0.191) 0.081 0.171 3 0.25 4.40 0.264 ( 0.191) 0.084 0.180 4 0.33 4.80 0.288 ( 0.191) 0.092 0.196 5 0.42 5.20 0.312 ( 0.191) 0.100 0.212 6 0.50 6.20 0.372 ( 0.191) 0.119 0.253 7 0.58 6.80 0.408 ( 0.191) 0.131 0.277 8 0.67 8.80 0.528 ( 0.191) 0.169 0.359 9 0.75 13.90 0.834 0.191 ( 0.267) 0.643 10 0.83 31.40 1.884 0.191 ( 0.603) 1.693 11 0.92 7.20 0.432 ( 0.191) 0.138 0.294 12 1.00 3.80 0.228 ( 0.191) 0.073 0.155 (Loss Rate Not Used)
Sum = 100.0 Sum = 4.6 Flood volume = Effective rainfall 0.38(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.0(Ac.Ft) Total soil loss = 0.12(In)
Total soil loss = 0.013(Ac.Ft)
Total rainfall = 0.50(In)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Flood volume = 1851.3 Cubic Feet
Total soil loss = 580.8 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 1.433(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.02 Q | | | | 0+10 0.0009 0.11 Q | | | | 0+15 0.0021 0.18 QV | | | | 0+20 0.0036 0.22 Q V | | | | 0+25 0.0053 0.24 Q V | | | | 0+30 0.0071 0.27 |Q V | | | | 0+35 0.0093 0.31 |Q V | | | | 0+40 0.0118 0.36 |Q |V | | | 0+45 0.0149 0.46 |Q | V | | | 0+50 0.0205 0.81 | Q | V| | | 0+55 0.0304 1.43 | Q | | V | | 1+ 0 0.0365 0.89 | Q | | | V | 1+ 5 0.0398 0.48 |Q | | | V | 1+10 0.0413 0.22 Q | | | V | 1+15 0.0420 0.09 Q | | | V| 1+20 0.0422 0.04 Q | | | V| 1+25 0.0424 0.02 Q | | | V| 1+30 0.0425 0.01 Q | | | V| 1+35 0.0425 0.00 Q | | | V| 1+40 0.0425 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b32.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
2 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 3 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.80 1.07
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.80 2.41
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 0.800(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.800(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 1.30 0.125 ( 0.191) 0.040 0.085 2 0.17 1.30 0.125 ( 0.191) 0.040 0.085 3 0.25 1.10 0.106 ( 0.191) 0.034 0.072 4 0.33 1.50 0.144 ( 0.191) 0.046 0.098 5 0.42 1.50 0.144 ( 0.191) 0.046 0.098 6 0.50 1.80 0.173 ( 0.191) 0.055 0.118 7 0.58 1.50 0.144 ( 0.191) 0.046 0.098 8 0.67 1.80 0.173 ( 0.191) 0.055 0.118 9 0.75 1.80 0.173 ( 0.191) 0.055 0.118 10 0.83 1.50 0.144 ( 0.191) 0.046 0.098 11 0.92 1.60 0.154 ( 0.191) 0.049 0.104 12 1.00 1.80 0.173 ( 0.191) 0.055 0.118 13 1.08 2.20 0.211 ( 0.191) 0.068 0.144 14 1.17 2.20 0.211 ( 0.191) 0.068 0.144 15 1.25 2.20 0.211 ( 0.191) 0.068 0.144 16 1.33 2.00 0.192 ( 0.191) 0.061 0.131 17 1.42 2.60 0.250 ( 0.191) 0.080 0.170 18 1.50 2.70 0.259 ( 0.191) 0.083 0.176 19 1.58 2.40 0.230 ( 0.191) 0.074 0.157 20 1.67 2.70 0.259 ( 0.191) 0.083 0.176 21 1.75 3.30 0.317 ( 0.191) 0.101 0.215 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 3.10 0.298 ( 0.191) 0.095 0.202 23 1.92 2.90 0.278 ( 0.191) 0.089 0.189 24 2.00 3.00 0.288 ( 0.191) 0.092 0.196 25 2.08 3.10 0.298 ( 0.191) 0.095 0.202 26 2.17 4.20 0.403 ( 0.191) 0.129 0.274 27 2.25 5.00 0.480 ( 0.191) 0.154 0.326 28 2.33 3.50 0.336 ( 0.191) 0.108 0.228 29 2.42 6.80 0.653 0.191 ( 0.209) 0.461 30 2.50 7.30 0.701 0.191 ( 0.224) 0.509 31 2.58 8.20 0.787 0.191 ( 0.252) 0.596 32 2.67 5.90 0.566 ( 0.191) 0.181 0.385 33 2.75 2.00 0.192 ( 0.191) 0.061 0.131 34 2.83 1.80 0.173 ( 0.191) 0.055 0.118 35 2.92 1.80 0.173 ( 0.191) 0.055 0.118 36 3.00 0.60 0.058 ( 0.191) 0.018 0.039 (Loss Rate Not Used)
Sum = 100.0 Sum = 6.6 Flood volume = Effective rainfall 0.55(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.25(In)
Total soil loss = 0.028(Ac.Ft)
Total rainfall = 0.80(In)
Flood volume = 2691.1 Cubic Feet
Total soil loss = 1200.2 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.694(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.01 Q | | | | 0+10 0.0005 0.07 Q | | | | 0+15 0.0012 0.09 Q | | | | 0+20 0.0018 0.10 QV | | | | 0+25 0.0026 0.12 QV | | | | 0+30 0.0035 0.13 Q V | | | | 0+35 0.0045 0.14 Q V | | | | 0+40 0.0055 0.14 Q V | | | | 0+45 0.0065 0.15 Q V | | | | 0+50 0.0075 0.15 Q V | | | | 0+55 0.0085 0.14 Q V | | | | 1+ 0 0.0095 0.14 Q V | | | | 1+ 5 0.0106 0.15 Q V | | | | 1+10 0.0118 0.18 Q V | | | | 1+15 0.0131 0.19 Q V | | | | 1+20 0.0144 0.19 Q V| | | | 1+25 0.0157 0.19 Q V | | | 1+30 0.0171 0.21 Q |V | | | 1+35 0.0186 0.22 Q | V | | | 1+40 0.0202 0.22 Q | V | | | 1+45 0.0218 0.23 Q | V | | | 1+50 0.0236 0.26 |Q | V | | | 1+55 0.0254 0.27 |Q | V | | | 2+ 0 0.0272 0.26 |Q | V | | | 2+ 5 0.0291 0.26 |Q | V | | | 2+10 0.0310 0.28 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 2+15 0.0333 0.33 |Q | |V | | 2+20 0.0359 0.38 |Q | | V | | 2+25 0.0385 0.37 |Q | | V | | 2+30 0.0420 0.51 | Q | | V | | 2+35 0.0462 0.62 | Q | | V| | 2+40 0.0510 0.69 | Q | | | V | 2+45 0.0550 0.57 | Q | | | V | 2+50 0.0574 0.36 |Q | | | V | 2+55 0.0591 0.24 Q | | | V | 3+ 0 0.0604 0.19 Q | | | V| 3+ 5 0.0612 0.11 Q | | | V| 3+10 0.0615 0.05 Q | | | V| 3+15 0.0617 0.02 Q | | | V| 3+20 0.0617 0.01 Q | | | V| 3+25 0.0618 0.00 Q | | | V| 3+30 0.0618 0.00 Q | | | V| 3+35 0.0618 0.00 Q | | | V| 3+40 0.0618 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b62.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
2 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.00 1.34
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 2.50 3.35
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.000(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.50 0.060 ( 0.191) 0.019 0.041 2 0.17 0.60 0.072 ( 0.191) 0.023 0.049 3 0.25 0.60 0.072 ( 0.191) 0.023 0.049 4 0.33 0.60 0.072 ( 0.191) 0.023 0.049 5 0.42 0.60 0.072 ( 0.191) 0.023 0.049 6 0.50 0.70 0.084 ( 0.191) 0.027 0.057 7 0.58 0.70 0.084 ( 0.191) 0.027 0.057 8 0.67 0.70 0.084 ( 0.191) 0.027 0.057 9 0.75 0.70 0.084 ( 0.191) 0.027 0.057 10 0.83 0.70 0.084 ( 0.191) 0.027 0.057 11 0.92 0.70 0.084 ( 0.191) 0.027 0.057 12 1.00 0.80 0.096 ( 0.191) 0.031 0.065 13 1.08 0.80 0.096 ( 0.191) 0.031 0.065 14 1.17 0.80 0.096 ( 0.191) 0.031 0.065 15 1.25 0.80 0.096 ( 0.191) 0.031 0.065 16 1.33 0.80 0.096 ( 0.191) 0.031 0.065 17 1.42 0.80 0.096 ( 0.191) 0.031 0.065 18 1.50 0.80 0.096 ( 0.191) 0.031 0.065 19 1.58 0.80 0.096 ( 0.191) 0.031 0.065 20 1.67 0.80 0.096 ( 0.191) 0.031 0.065 21 1.75 0.80 0.096 ( 0.191) 0.031 0.065 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.80 0.096 ( 0.191) 0.031 0.065 23 1.92 0.80 0.096 ( 0.191) 0.031 0.065 24 2.00 0.90 0.108 ( 0.191) 0.035 0.073 25 2.08 0.80 0.096 ( 0.191) 0.031 0.065 26 2.17 0.90 0.108 ( 0.191) 0.035 0.073 27 2.25 0.90 0.108 ( 0.191) 0.035 0.073 28 2.33 0.90 0.108 ( 0.191) 0.035 0.073 29 2.42 0.90 0.108 ( 0.191) 0.035 0.073 30 2.50 0.90 0.108 ( 0.191) 0.035 0.073 31 2.58 0.90 0.108 ( 0.191) 0.035 0.073 32 2.67 0.90 0.108 ( 0.191) 0.035 0.073 33 2.75 1.00 0.120 ( 0.191) 0.038 0.082 34 2.83 1.00 0.120 ( 0.191) 0.038 0.082 35 2.92 1.00 0.120 ( 0.191) 0.038 0.082 36 3.00 1.00 0.120 ( 0.191) 0.038 0.082 37 3.08 1.00 0.120 ( 0.191) 0.038 0.082 38 3.17 1.10 0.132 ( 0.191) 0.042 0.090 39 3.25 1.10 0.132 ( 0.191) 0.042 0.090 40 3.33 1.10 0.132 ( 0.191) 0.042 0.090 41 3.42 1.20 0.144 ( 0.191) 0.046 0.098 42 3.50 1.30 0.156 ( 0.191) 0.050 0.106 43 3.58 1.40 0.168 ( 0.191) 0.054 0.114 44 3.67 1.40 0.168 ( 0.191) 0.054 0.114 45 3.75 1.50 0.180 ( 0.191) 0.058 0.122 46 3.83 1.50 0.180 ( 0.191) 0.058 0.122 47 3.92 1.60 0.192 ( 0.191) 0.061 0.131 48 4.00 1.60 0.192 ( 0.191) 0.061 0.131 49 4.08 1.70 0.204 ( 0.191) 0.065 0.139 50 4.17 1.80 0.216 ( 0.191) 0.069 0.147 51 4.25 1.90 0.228 ( 0.191) 0.073 0.155 52 4.33 2.00 0.240 ( 0.191) 0.077 0.163 53 4.42 2.10 0.252 ( 0.191) 0.081 0.171 54 4.50 2.10 0.252 ( 0.191) 0.081 0.171 55 4.58 2.20 0.264 ( 0.191) 0.084 0.180 56 4.67 2.30 0.276 ( 0.191) 0.088 0.188 57 4.75 2.40 0.288 ( 0.191) 0.092 0.196 58 4.83 2.40 0.288 ( 0.191) 0.092 0.196 59 4.92 2.50 0.300 ( 0.191) 0.096 0.204 60 5.00 2.60 0.312 ( 0.191) 0.100 0.212 61 5.08 3.10 0.372 ( 0.191) 0.119 0.253 62 5.17 3.60 0.432 ( 0.191) 0.138 0.294 63 5.25 3.90 0.468 ( 0.191) 0.150 0.318 64 5.33 4.20 0.504 ( 0.191) 0.161 0.343 65 5.42 4.70 0.564 ( 0.191) 0.180 0.384 66 5.50 5.60 0.672 0.191 ( 0.215) 0.481 67 5.58 1.90 0.228 ( 0.191) 0.073 0.155 68 5.67 0.90 0.108 ( 0.191) 0.035 0.073 69 5.75 0.60 0.072 ( 0.191) 0.023 0.049 70 5.83 0.50 0.060 ( 0.191) 0.019 0.041 71 5.92 0.30 0.036 ( 0.191) 0.012 0.024 72 6.00 0.20 0.024 ( 0.191) 0.008 0.016 (Loss Rate Not Used)
Sum = 100.0 Sum = 8.2 Flood volume = Effective rainfall 0.68(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.32(In)
Total soil loss = 0.036(Ac.Ft)
Total rainfall = 1.00(In)
Flood volume = 3317.3 Cubic Feet
Total soil loss = 1546.9 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.539(CFS)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0003 0.03 Q | | | | 0+15 0.0006 0.05 Q | | | | 0+20 0.0010 0.06 Q | | | | 0+25 0.0015 0.06 Q | | | | 0+30 0.0019 0.07 QV | | | | 0+35 0.0024 0.07 QV | | | | 0+40 0.0029 0.07 QV | | | | 0+45 0.0034 0.08 QV | | | | 0+50 0.0040 0.08 Q V | | | | 0+55 0.0045 0.08 Q V | | | | 1+ 0 0.0050 0.08 Q V | | | | 1+ 5 0.0056 0.08 Q V | | | | 1+10 0.0062 0.09 Q V | | | | 1+15 0.0068 0.09 Q V | | | | 1+20 0.0074 0.09 Q V | | | | 1+25 0.0080 0.09 Q V | | | | 1+30 0.0086 0.09 Q V | | | | 1+35 0.0092 0.09 Q V | | | | 1+40 0.0098 0.09 Q V | | | | 1+45 0.0105 0.09 Q V | | | | 1+50 0.0111 0.09 Q V | | | | 1+55 0.0117 0.09 Q V | | | | 2+ 0 0.0123 0.09 Q V | | | | 2+ 5 0.0129 0.09 Q V | | | | 2+10 0.0136 0.09 Q V | | | | 2+15 0.0142 0.10 Q V | | | | 2+20 0.0149 0.10 Q V | | | | 2+25 0.0156 0.10 Q V | | | | 2+30 0.0163 0.10 Q V | | | | 2+35 0.0169 0.10 Q V | | | | 2+40 0.0176 0.10 Q V| | | | 2+45 0.0183 0.10 Q V| | | | 2+50 0.0190 0.11 Q V| | | | 2+55 0.0198 0.11 Q V | | | 3+ 0 0.0205 0.11 Q V | | | 3+ 5 0.0213 0.11 Q |V | | | 3+10 0.0221 0.11 Q |V | | | 3+15 0.0229 0.12 Q | V | | | 3+20 0.0237 0.12 Q | V | | | 3+25 0.0245 0.12 Q | V | | | 3+30 0.0254 0.13 Q | V | | | 3+35 0.0263 0.14 Q | V | | | 3+40 0.0274 0.15 Q | V | | | 3+45 0.0284 0.15 Q | V | | | 3+50 0.0295 0.16 Q | V | | | 3+55 0.0306 0.16 Q | V | | | 4+ 0 0.0318 0.17 Q | V | | | 4+ 5 0.0330 0.17 Q | V | | | 4+10 0.0343 0.18 Q | V | | | 4+15 0.0356 0.19 Q | V | | | 4+20 0.0370 0.20 Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+25 0.0385 0.21 Q | V | | 4+30 0.0400 0.22 Q | |V | | 4+35 0.0416 0.23 Q | |V | | 4+40 0.0432 0.24 Q | | V | | 4+45 0.0449 0.25 Q | | V | | 4+50 0.0467 0.26 |Q | | V | | 4+55 0.0485 0.26 |Q | | V | | 5+ 0 0.0503 0.27 |Q | | V | | 5+ 5 0.0523 0.28 |Q | | V | | 5+10 0.0545 0.32 |Q | | V | | 5+15 0.0570 0.37 |Q | | V| | 5+20 0.0598 0.40 |Q | | |V | 5+25 0.0628 0.44 |Q | | | V | 5+30 0.0662 0.49 |Q | | | V | 5+35 0.0700 0.54 | Q | | | V | 5+40 0.0724 0.36 |Q | | | V | 5+45 0.0738 0.21 Q | | | V | 5+50 0.0747 0.13 Q | | | V| 5+55 0.0753 0.09 Q | | | V| 6+ 0 0.0757 0.06 Q | | | V| 6+ 5 0.0760 0.04 Q | | | V| 6+10 0.0761 0.02 Q | | | V| 6+15 0.0761 0.01 Q | | | V| 6+20 0.0761 0.00 Q | | | V| 6+25 0.0761 0.00 Q | | | V| 6+30 0.0762 0.00 Q | | | V| 6+35 0.0762 0.00 Q | | | V| 6+40 0.0762 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b242.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
2 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.60 2.14
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 4.00 5.36
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 1.600(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.600(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.013 ( 0.339) 0.004 0.009 2 0.17 0.07 0.013 ( 0.338) 0.004 0.009 3 0.25 0.07 0.013 ( 0.337) 0.004 0.009 4 0.33 0.10 0.019 ( 0.335) 0.006 0.013 5 0.42 0.10 0.019 ( 0.334) 0.006 0.013 6 0.50 0.10 0.019 ( 0.333) 0.006 0.013 7 0.58 0.10 0.019 ( 0.331) 0.006 0.013 8 0.67 0.10 0.019 ( 0.330) 0.006 0.013 9 0.75 0.10 0.019 ( 0.329) 0.006 0.013 10 0.83 0.13 0.026 ( 0.327) 0.008 0.017 11 0.92 0.13 0.026 ( 0.326) 0.008 0.017 12 1.00 0.13 0.026 ( 0.325) 0.008 0.017 13 1.08 0.10 0.019 ( 0.324) 0.006 0.013 14 1.17 0.10 0.019 ( 0.322) 0.006 0.013 15 1.25 0.10 0.019 ( 0.321) 0.006 0.013 16 1.33 0.10 0.019 ( 0.320) 0.006 0.013 17 1.42 0.10 0.019 ( 0.318) 0.006 0.013 18 1.50 0.10 0.019 ( 0.317) 0.006 0.013 19 1.58 0.10 0.019 ( 0.316) 0.006 0.013 20 1.67 0.10 0.019 ( 0.315) 0.006 0.013 21 1.75 0.10 0.019 ( 0.313) 0.006 0.013 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.13 0.026 ( 0.312) 0.008 0.017 23 1.92 0.13 0.026 ( 0.311) 0.008 0.017 24 2.00 0.13 0.026 ( 0.310) 0.008 0.017 25 2.08 0.13 0.026 ( 0.308) 0.008 0.017 26 2.17 0.13 0.026 ( 0.307) 0.008 0.017 27 2.25 0.13 0.026 ( 0.306) 0.008 0.017 28 2.33 0.13 0.026 ( 0.305) 0.008 0.017 29 2.42 0.13 0.026 ( 0.303) 0.008 0.017 30 2.50 0.13 0.026 ( 0.302) 0.008 0.017 31 2.58 0.17 0.032 ( 0.301) 0.010 0.022 32 2.67 0.17 0.032 ( 0.300) 0.010 0.022 33 2.75 0.17 0.032 ( 0.298) 0.010 0.022 34 2.83 0.17 0.032 ( 0.297) 0.010 0.022 35 2.92 0.17 0.032 ( 0.296) 0.010 0.022 36 3.00 0.17 0.032 ( 0.295) 0.010 0.022 37 3.08 0.17 0.032 ( 0.294) 0.010 0.022 38 3.17 0.17 0.032 ( 0.292) 0.010 0.022 39 3.25 0.17 0.032 ( 0.291) 0.010 0.022 40 3.33 0.17 0.032 ( 0.290) 0.010 0.022 41 3.42 0.17 0.032 ( 0.289) 0.010 0.022 42 3.50 0.17 0.032 ( 0.288) 0.010 0.022 43 3.58 0.17 0.032 ( 0.286) 0.010 0.022 44 3.67 0.17 0.032 ( 0.285) 0.010 0.022 45 3.75 0.17 0.032 ( 0.284) 0.010 0.022 46 3.83 0.20 0.038 ( 0.283) 0.012 0.026 47 3.92 0.20 0.038 ( 0.282) 0.012 0.026 48 4.00 0.20 0.038 ( 0.280) 0.012 0.026 49 4.08 0.20 0.038 ( 0.279) 0.012 0.026 50 4.17 0.20 0.038 ( 0.278) 0.012 0.026 51 4.25 0.20 0.038 ( 0.277) 0.012 0.026 52 4.33 0.23 0.045 ( 0.276) 0.014 0.030 53 4.42 0.23 0.045 ( 0.274) 0.014 0.030 54 4.50 0.23 0.045 ( 0.273) 0.014 0.030 55 4.58 0.23 0.045 ( 0.272) 0.014 0.030 56 4.67 0.23 0.045 ( 0.271) 0.014 0.030 57 4.75 0.23 0.045 ( 0.270) 0.014 0.030 58 4.83 0.27 0.051 ( 0.269) 0.016 0.035 59 4.92 0.27 0.051 ( 0.267) 0.016 0.035 60 5.00 0.27 0.051 ( 0.266) 0.016 0.035 61 5.08 0.20 0.038 ( 0.265) 0.012 0.026 62 5.17 0.20 0.038 ( 0.264) 0.012 0.026 63 5.25 0.20 0.038 ( 0.263) 0.012 0.026 64 5.33 0.23 0.045 ( 0.262) 0.014 0.030 65 5.42 0.23 0.045 ( 0.260) 0.014 0.030 66 5.50 0.23 0.045 ( 0.259) 0.014 0.030 67 5.58 0.27 0.051 ( 0.258) 0.016 0.035 68 5.67 0.27 0.051 ( 0.257) 0.016 0.035 69 5.75 0.27 0.051 ( 0.256) 0.016 0.035 70 5.83 0.27 0.051 ( 0.255) 0.016 0.035 71 5.92 0.27 0.051 ( 0.254) 0.016 0.035 72 6.00 0.27 0.051 ( 0.253) 0.016 0.035 73 6.08 0.30 0.058 ( 0.251) 0.018 0.039 74 6.17 0.30 0.058 ( 0.250) 0.018 0.039 75 6.25 0.30 0.058 ( 0.249) 0.018 0.039 76 6.33 0.30 0.058 ( 0.248) 0.018 0.039 77 6.42 0.30 0.058 ( 0.247) 0.018 0.039 78 6.50 0.30 0.058 ( 0.246) 0.018 0.039 79 6.58 0.33 0.064 ( 0.245) 0.020 0.044 80 6.67 0.33 0.064 ( 0.244) 0.020 0.044 81 6.75 0.33 0.064 ( 0.243) 0.020 0.044 82 6.83 0.33 0.064 ( 0.241) 0.020 0.044 83 6.92 0.33 0.064 ( 0.240) 0.020 0.044 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 84 7.00 0.33 0.064 ( 0.239) 0.020 0.044 85 7.08 0.33 0.064 ( 0.238) 0.020 0.044 86 7.17 0.33 0.064 ( 0.237) 0.020 0.044 87 7.25 0.33 0.064 ( 0.236) 0.020 0.044 88 7.33 0.37 0.070 ( 0.235) 0.023 0.048 89 7.42 0.37 0.070 ( 0.234) 0.023 0.048 90 7.50 0.37 0.070 ( 0.233) 0.023 0.048 91 7.58 0.40 0.077 ( 0.232) 0.025 0.052 92 7.67 0.40 0.077 ( 0.231) 0.025 0.052 93 7.75 0.40 0.077 ( 0.230) 0.025 0.052 94 7.83 0.43 0.083 ( 0.229) 0.027 0.057 95 7.92 0.43 0.083 ( 0.227) 0.027 0.057 96 8.00 0.43 0.083 ( 0.226) 0.027 0.057 97 8.08 0.50 0.096 ( 0.225) 0.031 0.065 98 8.17 0.50 0.096 ( 0.224) 0.031 0.065 99 8.25 0.50 0.096 ( 0.223) 0.031 0.065 100 8.33 0.50 0.096 ( 0.222) 0.031 0.065 101 8.42 0.50 0.096 ( 0.221) 0.031 0.065 102 8.50 0.50 0.096 ( 0.220) 0.031 0.065 103 8.58 0.53 0.102 ( 0.219) 0.033 0.070 104 8.67 0.53 0.102 ( 0.218) 0.033 0.070 105 8.75 0.53 0.102 ( 0.217) 0.033 0.070 106 8.83 0.57 0.109 ( 0.216) 0.035 0.074 107 8.92 0.57 0.109 ( 0.215) 0.035 0.074 108 9.00 0.57 0.109 ( 0.214) 0.035 0.074 109 9.08 0.63 0.122 ( 0.213) 0.039 0.083 110 9.17 0.63 0.122 ( 0.212) 0.039 0.083 111 9.25 0.63 0.122 ( 0.211) 0.039 0.083 112 9.33 0.67 0.128 ( 0.210) 0.041 0.087 113 9.42 0.67 0.128 ( 0.209) 0.041 0.087 114 9.50 0.67 0.128 ( 0.208) 0.041 0.087 115 9.58 0.70 0.134 ( 0.207) 0.043 0.091 116 9.67 0.70 0.134 ( 0.206) 0.043 0.091 117 9.75 0.70 0.134 ( 0.205) 0.043 0.091 118 9.83 0.73 0.141 ( 0.204) 0.045 0.096 119 9.92 0.73 0.141 ( 0.203) 0.045 0.096 120 10.00 0.73 0.141 ( 0.202) 0.045 0.096 121 10.08 0.50 0.096 ( 0.201) 0.031 0.065 122 10.17 0.50 0.096 ( 0.200) 0.031 0.065 123 10.25 0.50 0.096 ( 0.199) 0.031 0.065 124 10.33 0.50 0.096 ( 0.198) 0.031 0.065 125 10.42 0.50 0.096 ( 0.197) 0.031 0.065 126 10.50 0.50 0.096 ( 0.196) 0.031 0.065 127 10.58 0.67 0.128 ( 0.195) 0.041 0.087 128 10.67 0.67 0.128 ( 0.194) 0.041 0.087 129 10.75 0.67 0.128 ( 0.193) 0.041 0.087 130 10.83 0.67 0.128 ( 0.192) 0.041 0.087 131 10.92 0.67 0.128 ( 0.191) 0.041 0.087 132 11.00 0.67 0.128 ( 0.191) 0.041 0.087 133 11.08 0.63 0.122 ( 0.190) 0.039 0.083 134 11.17 0.63 0.122 ( 0.189) 0.039 0.083 135 11.25 0.63 0.122 ( 0.188) 0.039 0.083 136 11.33 0.63 0.122 ( 0.187) 0.039 0.083 137 11.42 0.63 0.122 ( 0.186) 0.039 0.083 138 11.50 0.63 0.122 ( 0.185) 0.039 0.083 139 11.58 0.57 0.109 ( 0.184) 0.035 0.074 140 11.67 0.57 0.109 ( 0.183) 0.035 0.074 141 11.75 0.57 0.109 ( 0.182) 0.035 0.074 142 11.83 0.60 0.115 ( 0.181) 0.037 0.078 143 11.92 0.60 0.115 ( 0.180) 0.037 0.078 144 12.00 0.60 0.115 ( 0.179) 0.037 0.078 145 12.08 0.83 0.160 ( 0.179) 0.051 0.109 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 146 12.17 0.83 0.160 ( 0.178) 0.051 0.109 147 12.25 0.83 0.160 ( 0.177) 0.051 0.109 148 12.33 0.87 0.166 ( 0.176) 0.053 0.113 149 12.42 0.87 0.166 ( 0.175) 0.053 0.113 150 12.50 0.87 0.166 ( 0.174) 0.053 0.113 151 12.58 0.93 0.179 ( 0.173) 0.057 0.122 152 12.67 0.93 0.179 ( 0.172) 0.057 0.122 153 12.75 0.93 0.179 ( 0.172) 0.057 0.122 154 12.83 0.97 0.186 ( 0.171) 0.059 0.126 155 12.92 0.97 0.186 ( 0.170) 0.059 0.126 156 13.00 0.97 0.186 ( 0.169) 0.059 0.126 157 13.08 1.13 0.218 ( 0.168) 0.070 0.148 158 13.17 1.13 0.218 ( 0.167) 0.070 0.148 159 13.25 1.13 0.218 ( 0.166) 0.070 0.148 160 13.33 1.13 0.218 ( 0.166) 0.070 0.148 161 13.42 1.13 0.218 ( 0.165) 0.070 0.148 162 13.50 1.13 0.218 ( 0.164) 0.070 0.148 163 13.58 0.77 0.147 ( 0.163) 0.047 0.100 164 13.67 0.77 0.147 ( 0.162) 0.047 0.100 165 13.75 0.77 0.147 ( 0.161) 0.047 0.100 166 13.83 0.77 0.147 ( 0.161) 0.047 0.100 167 13.92 0.77 0.147 ( 0.160) 0.047 0.100 168 14.00 0.77 0.147 ( 0.159) 0.047 0.100 169 14.08 0.90 0.173 ( 0.158) 0.055 0.118 170 14.17 0.90 0.173 ( 0.157) 0.055 0.118 171 14.25 0.90 0.173 ( 0.157) 0.055 0.118 172 14.33 0.87 0.166 ( 0.156) 0.053 0.113 173 14.42 0.87 0.166 ( 0.155) 0.053 0.113 174 14.50 0.87 0.166 ( 0.154) 0.053 0.113 175 14.58 0.87 0.166 ( 0.153) 0.053 0.113 176 14.67 0.87 0.166 ( 0.153) 0.053 0.113 177 14.75 0.87 0.166 ( 0.152) 0.053 0.113 178 14.83 0.83 0.160 ( 0.151) 0.051 0.109 179 14.92 0.83 0.160 ( 0.150) 0.051 0.109 180 15.00 0.83 0.160 ( 0.149) 0.051 0.109 181 15.08 0.80 0.154 ( 0.149) 0.049 0.104 182 15.17 0.80 0.154 ( 0.148) 0.049 0.104 183 15.25 0.80 0.154 ( 0.147) 0.049 0.104 184 15.33 0.77 0.147 ( 0.146) 0.047 0.100 185 15.42 0.77 0.147 ( 0.146) 0.047 0.100 186 15.50 0.77 0.147 ( 0.145) 0.047 0.100 187 15.58 0.63 0.122 ( 0.144) 0.039 0.083 188 15.67 0.63 0.122 ( 0.143) 0.039 0.083 189 15.75 0.63 0.122 ( 0.143) 0.039 0.083 190 15.83 0.63 0.122 ( 0.142) 0.039 0.083 191 15.92 0.63 0.122 ( 0.141) 0.039 0.083 192 16.00 0.63 0.122 ( 0.141) 0.039 0.083 193 16.08 0.13 0.026 ( 0.140) 0.008 0.017 194 16.17 0.13 0.026 ( 0.139) 0.008 0.017 195 16.25 0.13 0.026 ( 0.138) 0.008 0.017 196 16.33 0.13 0.026 ( 0.138) 0.008 0.017 197 16.42 0.13 0.026 ( 0.137) 0.008 0.017 198 16.50 0.13 0.026 ( 0.136) 0.008 0.017 199 16.58 0.10 0.019 ( 0.136) 0.006 0.013 200 16.67 0.10 0.019 ( 0.135) 0.006 0.013 201 16.75 0.10 0.019 ( 0.134) 0.006 0.013 202 16.83 0.10 0.019 ( 0.134) 0.006 0.013 203 16.92 0.10 0.019 ( 0.133) 0.006 0.013 204 17.00 0.10 0.019 ( 0.132) 0.006 0.013 205 17.08 0.17 0.032 ( 0.131) 0.010 0.022 206 17.17 0.17 0.032 ( 0.131) 0.010 0.022 207 17.25 0.17 0.032 ( 0.130) 0.010 0.022 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 208 17.33 0.17 0.032 ( 0.130) 0.010 0.022 209 17.42 0.17 0.032 ( 0.129) 0.010 0.022 210 17.50 0.17 0.032 ( 0.128) 0.010 0.022 211 17.58 0.17 0.032 ( 0.128) 0.010 0.022 212 17.67 0.17 0.032 ( 0.127) 0.010 0.022 213 17.75 0.17 0.032 ( 0.126) 0.010 0.022 214 17.83 0.13 0.026 ( 0.126) 0.008 0.017 215 17.92 0.13 0.026 ( 0.125) 0.008 0.017 216 18.00 0.13 0.026 ( 0.124) 0.008 0.017 217 18.08 0.13 0.026 ( 0.124) 0.008 0.017 218 18.17 0.13 0.026 ( 0.123) 0.008 0.017 219 18.25 0.13 0.026 ( 0.123) 0.008 0.017 220 18.33 0.13 0.026 ( 0.122) 0.008 0.017 221 18.42 0.13 0.026 ( 0.121) 0.008 0.017 222 18.50 0.13 0.026 ( 0.121) 0.008 0.017 223 18.58 0.10 0.019 ( 0.120) 0.006 0.013 224 18.67 0.10 0.019 ( 0.120) 0.006 0.013 225 18.75 0.10 0.019 ( 0.119) 0.006 0.013 226 18.83 0.07 0.013 ( 0.119) 0.004 0.009 227 18.92 0.07 0.013 ( 0.118) 0.004 0.009 228 19.00 0.07 0.013 ( 0.117) 0.004 0.009 229 19.08 0.10 0.019 ( 0.117) 0.006 0.013 230 19.17 0.10 0.019 ( 0.116) 0.006 0.013 231 19.25 0.10 0.019 ( 0.116) 0.006 0.013 232 19.33 0.13 0.026 ( 0.115) 0.008 0.017 233 19.42 0.13 0.026 ( 0.115) 0.008 0.017 234 19.50 0.13 0.026 ( 0.114) 0.008 0.017 235 19.58 0.10 0.019 ( 0.114) 0.006 0.013 236 19.67 0.10 0.019 ( 0.113) 0.006 0.013 237 19.75 0.10 0.019 ( 0.113) 0.006 0.013 238 19.83 0.07 0.013 ( 0.112) 0.004 0.009 239 19.92 0.07 0.013 ( 0.112) 0.004 0.009 240 20.00 0.07 0.013 ( 0.111) 0.004 0.009 241 20.08 0.10 0.019 ( 0.111) 0.006 0.013 242 20.17 0.10 0.019 ( 0.110) 0.006 0.013 243 20.25 0.10 0.019 ( 0.110) 0.006 0.013 244 20.33 0.10 0.019 ( 0.109) 0.006 0.013 245 20.42 0.10 0.019 ( 0.109) 0.006 0.013 246 20.50 0.10 0.019 ( 0.108) 0.006 0.013 247 20.58 0.10 0.019 ( 0.108) 0.006 0.013 248 20.67 0.10 0.019 ( 0.107) 0.006 0.013 249 20.75 0.10 0.019 ( 0.107) 0.006 0.013 250 20.83 0.07 0.013 ( 0.106) 0.004 0.009 251 20.92 0.07 0.013 ( 0.106) 0.004 0.009 252 21.00 0.07 0.013 ( 0.106) 0.004 0.009 253 21.08 0.10 0.019 ( 0.105) 0.006 0.013 254 21.17 0.10 0.019 ( 0.105) 0.006 0.013 255 21.25 0.10 0.019 ( 0.104) 0.006 0.013 256 21.33 0.07 0.013 ( 0.104) 0.004 0.009 257 21.42 0.07 0.013 ( 0.104) 0.004 0.009 258 21.50 0.07 0.013 ( 0.103) 0.004 0.009 259 21.58 0.10 0.019 ( 0.103) 0.006 0.013 260 21.67 0.10 0.019 ( 0.102) 0.006 0.013 261 21.75 0.10 0.019 ( 0.102) 0.006 0.013 262 21.83 0.07 0.013 ( 0.102) 0.004 0.009 263 21.92 0.07 0.013 ( 0.101) 0.004 0.009 264 22.00 0.07 0.013 ( 0.101) 0.004 0.009 265 22.08 0.10 0.019 ( 0.101) 0.006 0.013 266 22.17 0.10 0.019 ( 0.100) 0.006 0.013 267 22.25 0.10 0.019 ( 0.100) 0.006 0.013 268 22.33 0.07 0.013 ( 0.100) 0.004 0.009 269 22.42 0.07 0.013 ( 0.099) 0.004 0.009 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 270 22.50 0.07 0.013 ( 0.099) 0.004 0.009 271 22.58 0.07 0.013 ( 0.099) 0.004 0.009 272 22.67 0.07 0.013 ( 0.099) 0.004 0.009 273 22.75 0.07 0.013 ( 0.098) 0.004 0.009 274 22.83 0.07 0.013 ( 0.098) 0.004 0.009 275 22.92 0.07 0.013 ( 0.098) 0.004 0.009 276 23.00 0.07 0.013 ( 0.098) 0.004 0.009 277 23.08 0.07 0.013 ( 0.097) 0.004 0.009 278 23.17 0.07 0.013 ( 0.097) 0.004 0.009 279 23.25 0.07 0.013 ( 0.097) 0.004 0.009 280 23.33 0.07 0.013 ( 0.097) 0.004 0.009 281 23.42 0.07 0.013 ( 0.097) 0.004 0.009 282 23.50 0.07 0.013 ( 0.096) 0.004 0.009 283 23.58 0.07 0.013 ( 0.096) 0.004 0.009 284 23.67 0.07 0.013 ( 0.096) 0.004 0.009 285 23.75 0.07 0.013 ( 0.096) 0.004 0.009 286 23.83 0.07 0.013 ( 0.096) 0.004 0.009 287 23.92 0.07 0.013 ( 0.096) 0.004 0.009 288 24.00 0.07 0.013 ( 0.096) 0.004 0.009 (Loss Rate Not Used)
Sum = 100.0 Sum = 13.1 Flood volume = Effective rainfall 1.09(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.51(In)
Total soil loss = 0.057(Ac.Ft)
Total rainfall = 1.60(In)
Flood volume = 5292.2 Cubic Feet
Total soil loss = 2490.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.199(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0001 0.01 Q | | | | 0+20 0.0002 0.01 Q | | | | 0+25 0.0003 0.01 Q | | | | 0+30 0.0004 0.02 Q | | | | 0+35 0.0005 0.02 Q | | | | 0+40 0.0006 0.02 Q | | | | 0+45 0.0008 0.02 Q | | | | 0+50 0.0009 0.02 Q | | | | 0+55 0.0010 0.02 Q | | | | 1+ 0 0.0012 0.02 Q | | | | 1+ 5 0.0013 0.02 Q | | | | 1+10 0.0015 0.02 Q | | | | 1+15 0.0016 0.02 Q | | | | 1+20 0.0017 0.02 Q | | | | 1+25 0.0019 0.02 Q | | | | 1+30 0.0020 0.02 Q | | | | 1+35 0.0021 0.02 Q | | | | 1+40 0.0022 0.02 Q | | | | 1+45 0.0023 0.02 Q | | | | 1+50 0.0025 0.02 Q | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 1+55 0.0026 0.02 Q | | | | 2+ 0 0.0028 0.02 Q | | | | 2+ 5 0.0029 0.02 Q | | | | 2+10 0.0031 0.02 QV | | | | 2+15 0.0033 0.02 QV | | | | 2+20 0.0034 0.02 QV | | | | 2+25 0.0036 0.02 QV | | | | 2+30 0.0037 0.02 QV | | | | 2+35 0.0039 0.02 QV | | | | 2+40 0.0041 0.03 QV | | | | 2+45 0.0043 0.03 QV | | | | 2+50 0.0045 0.03 QV | | | | 2+55 0.0047 0.03 QV | | | | 3+ 0 0.0049 0.03 QV | | | | 3+ 5 0.0051 0.03 QV | | | | 3+10 0.0053 0.03 QV | | | | 3+15 0.0055 0.03 QV | | | | 3+20 0.0057 0.03 QV | | | | 3+25 0.0059 0.03 QV | | | | 3+30 0.0061 0.03 Q V | | | | 3+35 0.0063 0.03 Q V | | | | 3+40 0.0065 0.03 Q V | | | | 3+45 0.0067 0.03 Q V | | | | 3+50 0.0069 0.03 Q V | | | | 3+55 0.0071 0.03 Q V | | | | 4+ 0 0.0074 0.03 Q V | | | | 4+ 5 0.0076 0.03 Q V | | | | 4+10 0.0079 0.04 Q V | | | | 4+15 0.0081 0.04 Q V | | | | 4+20 0.0083 0.04 Q V | | | | 4+25 0.0086 0.04 Q V | | | | 4+30 0.0089 0.04 Q V | | | | 4+35 0.0092 0.04 Q V | | | | 4+40 0.0095 0.04 Q V | | | | 4+45 0.0097 0.04 Q V | | | | 4+50 0.0100 0.04 Q V | | | | 4+55 0.0103 0.04 Q V | | | | 5+ 0 0.0106 0.05 Q V | | | | 5+ 5 0.0110 0.05 Q V | | | | 5+10 0.0112 0.04 Q V | | | | 5+15 0.0115 0.04 Q V | | | | 5+20 0.0117 0.04 Q V | | | | 5+25 0.0120 0.04 Q V | | | | 5+30 0.0123 0.04 Q V | | | | 5+35 0.0126 0.04 Q V | | | | 5+40 0.0129 0.04 Q V | | | | 5+45 0.0132 0.05 Q V | | | | 5+50 0.0135 0.05 Q V | | | | 5+55 0.0138 0.05 Q V | | | | 6+ 0 0.0142 0.05 Q V | | | | 6+ 5 0.0145 0.05 Q V | | | | 6+10 0.0148 0.05 Q V | | | | 6+15 0.0152 0.05 Q V | | | | 6+20 0.0156 0.05 Q V | | | | 6+25 0.0159 0.05 Q V | | | | 6+30 0.0163 0.05 Q V | | | | 6+35 0.0167 0.05 Q V | | | | 6+40 0.0170 0.06 Q V | | | | 6+45 0.0174 0.06 Q V | | | | 6+50 0.0178 0.06 Q V | | | | 6+55 0.0182 0.06 Q V | | | | 7+ 0 0.0186 0.06 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 7+ 5 0.0190 0.06 Q V | | | | 7+10 0.0195 0.06 Q V | | | | 7+15 0.0199 0.06 Q V | | | | 7+20 0.0203 0.06 Q V | | | | 7+25 0.0207 0.06 Q V | | | | 7+30 0.0211 0.06 Q V | | | | 7+35 0.0216 0.06 Q V | | | | 7+40 0.0220 0.07 Q V | | | | 7+45 0.0225 0.07 Q V | | | | 7+50 0.0230 0.07 Q V | | | | 7+55 0.0235 0.07 Q V | | | | 8+ 0 0.0240 0.08 Q V | | | | 8+ 5 0.0246 0.08 Q V | | | | 8+10 0.0251 0.08 Q V | | | | 8+15 0.0257 0.09 Q V | | | | 8+20 0.0263 0.09 Q V | | | | 8+25 0.0269 0.09 Q V | | | | 8+30 0.0275 0.09 Q V| | | | 8+35 0.0282 0.09 Q V| | | | 8+40 0.0288 0.09 Q V| | | | 8+45 0.0294 0.09 Q V| | | | 8+50 0.0301 0.09 Q V| | | | 8+55 0.0307 0.10 Q V | | | 9+ 0 0.0314 0.10 Q V | | | 9+ 5 0.0321 0.10 Q V | | | 9+10 0.0328 0.11 Q V | | | 9+15 0.0336 0.11 Q |V | | | 9+20 0.0344 0.11 Q |V | | | 9+25 0.0352 0.11 Q |V | | | 9+30 0.0360 0.12 Q |V | | | 9+35 0.0368 0.12 Q | V | | | 9+40 0.0376 0.12 Q | V | | | 9+45 0.0384 0.12 Q | V | | | 9+50 0.0393 0.12 Q | V | | | 9+55 0.0402 0.13 Q | V | | | 10+ 0 0.0410 0.13 Q | V | | | 10+ 5 0.0419 0.13 Q | V | | | 10+10 0.0426 0.11 Q | V | | | 10+15 0.0433 0.10 Q | V | | | 10+20 0.0439 0.09 Q | V | | | 10+25 0.0445 0.09 Q | V | | | 10+30 0.0452 0.09 Q | V | | | 10+35 0.0458 0.09 Q | V | | | 10+40 0.0465 0.11 Q | V | | | 10+45 0.0473 0.11 Q | V | | | 10+50 0.0481 0.12 Q | V | | | 10+55 0.0489 0.12 Q | V | | | 11+ 0 0.0497 0.12 Q | V | | | 11+ 5 0.0505 0.12 Q | V | | | 11+10 0.0513 0.11 Q | V | | | 11+15 0.0521 0.11 Q | V | | | 11+20 0.0528 0.11 Q | V | | | 11+25 0.0536 0.11 Q | V | | | 11+30 0.0544 0.11 Q | V | | | 11+35 0.0551 0.11 Q | V | | | 11+40 0.0559 0.10 Q | V | | | 11+45 0.0566 0.10 Q | V | | | 11+50 0.0573 0.10 Q | V | | | 11+55 0.0580 0.10 Q | V| | | 12+ 0 0.0587 0.10 Q | V| | | 12+ 5 0.0594 0.11 Q | V| | | 12+10 0.0603 0.13 Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+15 0.0613 0.14 Q | V | | 12+20 0.0623 0.14 Q | V | | 12+25 0.0633 0.15 Q | V | | 12+30 0.0644 0.15 Q | |V | | 12+35 0.0654 0.15 Q | |V | | 12+40 0.0665 0.16 Q | |V | | 12+45 0.0676 0.16 Q | | V | | 12+50 0.0688 0.16 Q | | V | | 12+55 0.0699 0.17 Q | | V | | 13+ 0 0.0711 0.17 Q | | V | | 13+ 5 0.0723 0.17 Q | | V | | 13+10 0.0736 0.19 Q | | V | | 13+15 0.0749 0.19 Q | | V | | 13+20 0.0762 0.20 Q | | V | | 13+25 0.0776 0.20 Q | | V | | 13+30 0.0790 0.20 Q | | V | | 13+35 0.0803 0.19 Q | | V | | 13+40 0.0814 0.16 Q | | V | | 13+45 0.0825 0.15 Q | | V | | 13+50 0.0834 0.14 Q | | V | | 13+55 0.0844 0.14 Q | | V | | 14+ 0 0.0853 0.14 Q | | V | | 14+ 5 0.0863 0.14 Q | | V | | 14+10 0.0873 0.15 Q | | V | | 14+15 0.0884 0.15 Q | | V| | 14+20 0.0894 0.16 Q | | V| | 14+25 0.0905 0.15 Q | | V| | 14+30 0.0916 0.15 Q | | V | 14+35 0.0926 0.15 Q | | V | 14+40 0.0937 0.15 Q | | V | 14+45 0.0947 0.15 Q | | |V | 14+50 0.0958 0.15 Q | | |V | 14+55 0.0968 0.15 Q | | |V | 15+ 0 0.0978 0.15 Q | | | V | 15+ 5 0.0988 0.15 Q | | | V | 15+10 0.0998 0.14 Q | | | V | 15+15 0.1008 0.14 Q | | | V | 15+20 0.1018 0.14 Q | | | V | 15+25 0.1027 0.14 Q | | | V | 15+30 0.1037 0.14 Q | | | V | 15+35 0.1046 0.13 Q | | | V | 15+40 0.1054 0.12 Q | | | V | 15+45 0.1062 0.12 Q | | | V | 15+50 0.1070 0.11 Q | | | V | 15+55 0.1078 0.11 Q | | | V | 16+ 0 0.1085 0.11 Q | | | V | 16+ 5 0.1093 0.10 Q | | | V | 16+10 0.1097 0.06 Q | | | V | 16+15 0.1100 0.04 Q | | | V | 16+20 0.1102 0.03 Q | | | V | 16+25 0.1104 0.03 Q | | | V | 16+30 0.1105 0.02 Q | | | V | 16+35 0.1107 0.02 Q | | | V | 16+40 0.1108 0.02 Q | | | V | 16+45 0.1110 0.02 Q | | | V | 16+50 0.1111 0.02 Q | | | V | 16+55 0.1112 0.02 Q | | | V | 17+ 0 0.1113 0.02 Q | | | V | 17+ 5 0.1115 0.02 Q | | | V | 17+10 0.1116 0.02 Q | | | V | 17+15 0.1118 0.03 Q | | | V | 17+20 0.1120 0.03 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 17+25 0.1122 0.03 Q | | | V | 17+30 0.1124 0.03 Q | | | V | 17+35 0.1126 0.03 Q | | | V | 17+40 0.1128 0.03 Q | | | V | 17+45 0.1130 0.03 Q | | | V | 17+50 0.1132 0.03 Q | | | V | 17+55 0.1134 0.03 Q | | | V | 18+ 0 0.1136 0.02 Q | | | V | 18+ 5 0.1137 0.02 Q | | | V | 18+10 0.1139 0.02 Q | | | V | 18+15 0.1141 0.02 Q | | | V | 18+20 0.1142 0.02 Q | | | V | 18+25 0.1144 0.02 Q | | | V | 18+30 0.1145 0.02 Q | | | V | 18+35 0.1147 0.02 Q | | | V | 18+40 0.1148 0.02 Q | | | V | 18+45 0.1150 0.02 Q | | | V | 18+50 0.1151 0.02 Q | | | V | 18+55 0.1152 0.01 Q | | | V | 19+ 0 0.1153 0.01 Q | | | V | 19+ 5 0.1154 0.01 Q | | | V | 19+10 0.1155 0.02 Q | | | V | 19+15 0.1156 0.02 Q | | | V | 19+20 0.1157 0.02 Q | | | V | 19+25 0.1159 0.02 Q | | | V | 19+30 0.1160 0.02 Q | | | V | 19+35 0.1162 0.02 Q | | | V | 19+40 0.1163 0.02 Q | | | V | 19+45 0.1164 0.02 Q | | | V | 19+50 0.1165 0.02 Q | | | V | 19+55 0.1166 0.01 Q | | | V | 20+ 0 0.1167 0.01 Q | | | V | 20+ 5 0.1168 0.01 Q | | | V | 20+10 0.1169 0.02 Q | | | V | 20+15 0.1170 0.02 Q | | | V | 20+20 0.1172 0.02 Q | | | V | 20+25 0.1173 0.02 Q | | | V | 20+30 0.1174 0.02 Q | | | V | 20+35 0.1175 0.02 Q | | | V | 20+40 0.1176 0.02 Q | | | V | 20+45 0.1178 0.02 Q | | | V | 20+50 0.1179 0.02 Q | | | V | 20+55 0.1180 0.01 Q | | | V | 21+ 0 0.1181 0.01 Q | | | V | 21+ 5 0.1182 0.01 Q | | | V | 21+10 0.1183 0.02 Q | | | V | 21+15 0.1184 0.02 Q | | | V | 21+20 0.1185 0.02 Q | | | V| 21+25 0.1186 0.01 Q | | | V| 21+30 0.1187 0.01 Q | | | V| 21+35 0.1188 0.01 Q | | | V| 21+40 0.1189 0.02 Q | | | V| 21+45 0.1190 0.02 Q | | | V| 21+50 0.1191 0.02 Q | | | V| 21+55 0.1192 0.01 Q | | | V| 22+ 0 0.1193 0.01 Q | | | V| 22+ 5 0.1194 0.01 Q | | | V| 22+10 0.1195 0.02 Q | | | V| 22+15 0.1196 0.02 Q | | | V| 22+20 0.1197 0.02 Q | | | V| 22+25 0.1198 0.01 Q | | | V| 22+30 0.1199 0.01 Q | | | V| PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22+35 0.1200 0.01 Q | | | V| 22+40 0.1201 0.01 Q | | | V| 22+45 0.1201 0.01 Q | | | V| 22+50 0.1202 0.01 Q | | | V| 22+55 0.1203 0.01 Q | | | V| 23+ 0 0.1204 0.01 Q | | | V| 23+ 5 0.1205 0.01 Q | | | V| 23+10 0.1205 0.01 Q | | | V| 23+15 0.1206 0.01 Q | | | V| 23+20 0.1207 0.01 Q | | | V| 23+25 0.1208 0.01 Q | | | V| 23+30 0.1209 0.01 Q | | | V| 23+35 0.1210 0.01 Q | | | V| 23+40 0.1210 0.01 Q | | | V| 23+45 0.1211 0.01 Q | | | V| 23+50 0.1212 0.01 Q | | | V| 23+55 0.1213 0.01 Q | | | V| 24+ 0 0.1214 0.01 Q | | | V| 24+ 5 0.1214 0.01 Q | | | V| 24+10 0.1215 0.00 Q | | | V| 24+15 0.1215 0.00 Q | | | V| 24+20 0.1215 0.00 Q | | | V| 24+25 0.1215 0.00 Q | | | V| 24+30 0.1215 0.00 Q | | | V| 24+35 0.1215 0.00 Q | | | V| 24+40 0.1215 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b15.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
5 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.50 0.67
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.10 1.47
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.641(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.641(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5500 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.30 0.254 ( 0.191) 0.081 0.172 2 0.17 4.20 0.323 ( 0.191) 0.103 0.220 3 0.25 4.40 0.338 ( 0.191) 0.108 0.230 4 0.33 4.80 0.369 ( 0.191) 0.118 0.251 5 0.42 5.20 0.400 ( 0.191) 0.128 0.272 6 0.50 6.20 0.477 ( 0.191) 0.152 0.324 7 0.58 6.80 0.523 ( 0.191) 0.167 0.355 8 0.67 8.80 0.676 0.191 ( 0.216) 0.485 9 0.75 13.90 1.068 0.191 ( 0.342) 0.877 10 0.83 31.40 2.414 0.191 ( 0.772) 2.222 11 0.92 7.20 0.553 ( 0.191) 0.177 0.376 12 1.00 3.80 0.292 ( 0.191) 0.093 0.199 (Loss Rate Not Used)
Sum = 100.0 Sum = 6.0 Flood volume = Effective rainfall 0.50(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.14(In)
Total soil loss = 0.016(Ac.Ft)
Total rainfall = 0.64(In)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Flood volume = 2425.4 Cubic Feet
Total soil loss = 690.3 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 1.892(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.02 Q | | | | 0+10 0.0011 0.14 Q | | | | 0+15 0.0027 0.23 QV | | | | 0+20 0.0046 0.28 |Q V | | | | 0+25 0.0067 0.31 |Q V | | | | 0+30 0.0092 0.35 |Q V | | | | 0+35 0.0119 0.40 |Q V | | | | 0+40 0.0151 0.46 |Q V | | | 0+45 0.0193 0.61 | Q | V | | | 0+50 0.0268 1.09 | Q | V| | | 0+55 0.0398 1.89 | Q | | V | | 1+ 0 0.0478 1.17 | Q | | | V | 1+ 5 0.0521 0.62 | Q | | | V | 1+10 0.0542 0.29 |Q | | | V | 1+15 0.0550 0.12 Q | | | V| 1+20 0.0553 0.05 Q | | | V| 1+25 0.0555 0.03 Q | | | V| 1+30 0.0557 0.01 Q | | | V| 1+35 0.0557 0.00 Q | | | V| 1+40 0.0557 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b35.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
5 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 3 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.80 1.07
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.80 2.41
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.034(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.034(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 1.30 0.161 ( 0.191) 0.052 0.110 2 0.17 1.30 0.161 ( 0.191) 0.052 0.110 3 0.25 1.10 0.137 ( 0.191) 0.044 0.093 4 0.33 1.50 0.186 ( 0.191) 0.060 0.127 5 0.42 1.50 0.186 ( 0.191) 0.060 0.127 6 0.50 1.80 0.223 ( 0.191) 0.071 0.152 7 0.58 1.50 0.186 ( 0.191) 0.060 0.127 8 0.67 1.80 0.223 ( 0.191) 0.071 0.152 9 0.75 1.80 0.223 ( 0.191) 0.071 0.152 10 0.83 1.50 0.186 ( 0.191) 0.060 0.127 11 0.92 1.60 0.199 ( 0.191) 0.064 0.135 12 1.00 1.80 0.223 ( 0.191) 0.071 0.152 13 1.08 2.20 0.273 ( 0.191) 0.087 0.186 14 1.17 2.20 0.273 ( 0.191) 0.087 0.186 15 1.25 2.20 0.273 ( 0.191) 0.087 0.186 16 1.33 2.00 0.248 ( 0.191) 0.079 0.169 17 1.42 2.60 0.323 ( 0.191) 0.103 0.219 18 1.50 2.70 0.335 ( 0.191) 0.107 0.228 19 1.58 2.40 0.298 ( 0.191) 0.095 0.203 20 1.67 2.70 0.335 ( 0.191) 0.107 0.228 21 1.75 3.30 0.410 ( 0.191) 0.131 0.278 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 3.10 0.385 ( 0.191) 0.123 0.262 23 1.92 2.90 0.360 ( 0.191) 0.115 0.245 24 2.00 3.00 0.372 ( 0.191) 0.119 0.253 25 2.08 3.10 0.385 ( 0.191) 0.123 0.262 26 2.17 4.20 0.521 ( 0.191) 0.167 0.354 27 2.25 5.00 0.621 0.191 ( 0.199) 0.429 28 2.33 3.50 0.434 ( 0.191) 0.139 0.295 29 2.42 6.80 0.844 0.191 ( 0.270) 0.653 30 2.50 7.30 0.906 0.191 ( 0.290) 0.715 31 2.58 8.20 1.018 0.191 ( 0.326) 0.826 32 2.67 5.90 0.732 0.191 ( 0.234) 0.541 33 2.75 2.00 0.248 ( 0.191) 0.079 0.169 34 2.83 1.80 0.223 ( 0.191) 0.071 0.152 35 2.92 1.80 0.223 ( 0.191) 0.071 0.152 36 3.00 0.60 0.074 ( 0.191) 0.024 0.051 (Loss Rate Not Used)
Sum = 100.0 Sum = 8.8 Flood volume = Effective rainfall 0.73(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.30(In)
Total soil loss = 0.034(Ac.Ft)
Total rainfall = 1.03(In)
Flood volume = 3567.5 Cubic Feet
Total soil loss = 1463.1 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.966(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.01 Q | | | | 0+10 0.0007 0.09 Q | | | | 0+15 0.0015 0.12 Q | | | | 0+20 0.0024 0.13 QV | | | | 0+25 0.0034 0.15 QV | | | | 0+30 0.0046 0.17 Q V | | | | 0+35 0.0058 0.18 Q V | | | | 0+40 0.0071 0.18 Q V | | | | 0+45 0.0084 0.19 Q V | | | | 0+50 0.0098 0.20 Q V | | | | 0+55 0.0110 0.18 Q V | | | | 1+ 0 0.0123 0.18 Q V | | | | 1+ 5 0.0137 0.20 Q V | | | | 1+10 0.0152 0.23 Q V | | | | 1+15 0.0169 0.24 Q V | | | | 1+20 0.0186 0.24 Q V| | | | 1+25 0.0202 0.24 Q V| | | | 1+30 0.0221 0.27 |Q V | | | 1+35 0.0241 0.29 |Q |V | | | 1+40 0.0261 0.28 |Q | V | | | 1+45 0.0281 0.30 |Q | V | | | 1+50 0.0305 0.34 |Q | V | | | 1+55 0.0329 0.35 |Q | V | | | 2+ 0 0.0352 0.34 |Q | V | | | 2+ 5 0.0376 0.34 |Q | V | | | 2+10 0.0400 0.36 |Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 2+15 0.0430 0.43 |Q | |V | | 2+20 0.0464 0.50 |Q | | V | | 2+25 0.0498 0.49 |Q | | V | | 2+30 0.0547 0.70 | Q | | V | | 2+35 0.0606 0.87 | Q | | V| | 2+40 0.0673 0.97 | Q | | | V | 2+45 0.0728 0.80 | Q | | | V | 2+50 0.0761 0.49 |Q | | | V | 2+55 0.0784 0.33 |Q | | | V | 3+ 0 0.0801 0.25 Q | | | V| 3+ 5 0.0811 0.14 Q | | | V| 3+10 0.0816 0.07 Q | | | V| 3+15 0.0818 0.03 Q | | | V| 3+20 0.0818 0.01 Q | | | V| 3+25 0.0819 0.00 Q | | | V| 3+30 0.0819 0.00 Q | | | V| 3+35 0.0819 0.00 Q | | | V| 3+40 0.0819 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b65.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
5 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.00 1.34
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 2.50 3.35
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.351(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.351(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.50 0.081 ( 0.191) 0.026 0.055 2 0.17 0.60 0.097 ( 0.191) 0.031 0.066 3 0.25 0.60 0.097 ( 0.191) 0.031 0.066 4 0.33 0.60 0.097 ( 0.191) 0.031 0.066 5 0.42 0.60 0.097 ( 0.191) 0.031 0.066 6 0.50 0.70 0.114 ( 0.191) 0.036 0.077 7 0.58 0.70 0.114 ( 0.191) 0.036 0.077 8 0.67 0.70 0.114 ( 0.191) 0.036 0.077 9 0.75 0.70 0.114 ( 0.191) 0.036 0.077 10 0.83 0.70 0.114 ( 0.191) 0.036 0.077 11 0.92 0.70 0.114 ( 0.191) 0.036 0.077 12 1.00 0.80 0.130 ( 0.191) 0.042 0.088 13 1.08 0.80 0.130 ( 0.191) 0.042 0.088 14 1.17 0.80 0.130 ( 0.191) 0.042 0.088 15 1.25 0.80 0.130 ( 0.191) 0.042 0.088 16 1.33 0.80 0.130 ( 0.191) 0.042 0.088 17 1.42 0.80 0.130 ( 0.191) 0.042 0.088 18 1.50 0.80 0.130 ( 0.191) 0.042 0.088 19 1.58 0.80 0.130 ( 0.191) 0.042 0.088 20 1.67 0.80 0.130 ( 0.191) 0.042 0.088 21 1.75 0.80 0.130 ( 0.191) 0.042 0.088 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.80 0.130 ( 0.191) 0.042 0.088 23 1.92 0.80 0.130 ( 0.191) 0.042 0.088 24 2.00 0.90 0.146 ( 0.191) 0.047 0.099 25 2.08 0.80 0.130 ( 0.191) 0.042 0.088 26 2.17 0.90 0.146 ( 0.191) 0.047 0.099 27 2.25 0.90 0.146 ( 0.191) 0.047 0.099 28 2.33 0.90 0.146 ( 0.191) 0.047 0.099 29 2.42 0.90 0.146 ( 0.191) 0.047 0.099 30 2.50 0.90 0.146 ( 0.191) 0.047 0.099 31 2.58 0.90 0.146 ( 0.191) 0.047 0.099 32 2.67 0.90 0.146 ( 0.191) 0.047 0.099 33 2.75 1.00 0.162 ( 0.191) 0.052 0.110 34 2.83 1.00 0.162 ( 0.191) 0.052 0.110 35 2.92 1.00 0.162 ( 0.191) 0.052 0.110 36 3.00 1.00 0.162 ( 0.191) 0.052 0.110 37 3.08 1.00 0.162 ( 0.191) 0.052 0.110 38 3.17 1.10 0.178 ( 0.191) 0.057 0.121 39 3.25 1.10 0.178 ( 0.191) 0.057 0.121 40 3.33 1.10 0.178 ( 0.191) 0.057 0.121 41 3.42 1.20 0.195 ( 0.191) 0.062 0.132 42 3.50 1.30 0.211 ( 0.191) 0.067 0.143 43 3.58 1.40 0.227 ( 0.191) 0.073 0.154 44 3.67 1.40 0.227 ( 0.191) 0.073 0.154 45 3.75 1.50 0.243 ( 0.191) 0.078 0.165 46 3.83 1.50 0.243 ( 0.191) 0.078 0.165 47 3.92 1.60 0.259 ( 0.191) 0.083 0.176 48 4.00 1.60 0.259 ( 0.191) 0.083 0.176 49 4.08 1.70 0.276 ( 0.191) 0.088 0.187 50 4.17 1.80 0.292 ( 0.191) 0.093 0.198 51 4.25 1.90 0.308 ( 0.191) 0.099 0.210 52 4.33 2.00 0.324 ( 0.191) 0.104 0.221 53 4.42 2.10 0.341 ( 0.191) 0.109 0.232 54 4.50 2.10 0.341 ( 0.191) 0.109 0.232 55 4.58 2.20 0.357 ( 0.191) 0.114 0.243 56 4.67 2.30 0.373 ( 0.191) 0.119 0.254 57 4.75 2.40 0.389 ( 0.191) 0.125 0.265 58 4.83 2.40 0.389 ( 0.191) 0.125 0.265 59 4.92 2.50 0.405 ( 0.191) 0.130 0.276 60 5.00 2.60 0.422 ( 0.191) 0.135 0.287 61 5.08 3.10 0.503 ( 0.191) 0.161 0.342 62 5.17 3.60 0.584 ( 0.191) 0.187 0.397 63 5.25 3.90 0.632 0.191 ( 0.202) 0.441 64 5.33 4.20 0.681 0.191 ( 0.218) 0.490 65 5.42 4.70 0.762 0.191 ( 0.244) 0.571 66 5.50 5.60 0.908 0.191 ( 0.291) 0.717 67 5.58 1.90 0.308 ( 0.191) 0.099 0.210 68 5.67 0.90 0.146 ( 0.191) 0.047 0.099 69 5.75 0.60 0.097 ( 0.191) 0.031 0.066 70 5.83 0.50 0.081 ( 0.191) 0.026 0.055 71 5.92 0.30 0.049 ( 0.191) 0.016 0.033 72 6.00 0.20 0.032 ( 0.191) 0.010 0.022 (Loss Rate Not Used)
Sum = 100.0 Sum = 11.2 Flood volume = Effective rainfall 0.93(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.42(In)
Total soil loss = 0.047(Ac.Ft)
Total rainfall = 1.35(In)
Flood volume = 4546.5 Cubic Feet
Total soil loss = 2026.6 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.793(CFS)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.01 Q | | | | 0+10 0.0004 0.04 Q | | | | 0+15 0.0008 0.07 Q | | | | 0+20 0.0014 0.08 Q | | | | 0+25 0.0020 0.09 Q | | | | 0+30 0.0026 0.09 Q | | | | 0+35 0.0033 0.10 QV | | | | 0+40 0.0040 0.10 QV | | | | 0+45 0.0047 0.10 QV | | | | 0+50 0.0054 0.10 Q V | | | | 0+55 0.0061 0.10 Q V | | | | 1+ 0 0.0068 0.11 Q V | | | | 1+ 5 0.0076 0.11 Q V | | | | 1+10 0.0084 0.12 Q V | | | | 1+15 0.0092 0.12 Q V | | | | 1+20 0.0100 0.12 Q V | | | | 1+25 0.0108 0.12 Q V | | | | 1+30 0.0117 0.12 Q V | | | | 1+35 0.0125 0.12 Q V | | | | 1+40 0.0133 0.12 Q V | | | | 1+45 0.0141 0.12 Q V | | | | 1+50 0.0150 0.12 Q V | | | | 1+55 0.0158 0.12 Q V | | | | 2+ 0 0.0166 0.12 Q V | | | | 2+ 5 0.0175 0.13 Q V | | | | 2+10 0.0183 0.12 Q V | | | | 2+15 0.0192 0.13 Q V | | | | 2+20 0.0201 0.13 Q V | | | | 2+25 0.0210 0.13 Q V | | | | 2+30 0.0220 0.13 Q V | | | | 2+35 0.0229 0.13 Q V | | | | 2+40 0.0238 0.13 Q V| | | | 2+45 0.0247 0.14 Q V| | | | 2+50 0.0257 0.14 Q V| | | | 2+55 0.0267 0.15 Q V | | | 3+ 0 0.0278 0.15 Q V | | | 3+ 5 0.0288 0.15 Q |V | | | 3+10 0.0298 0.15 Q |V | | | 3+15 0.0309 0.16 Q |V | | | 3+20 0.0320 0.16 Q | V | | | 3+25 0.0331 0.16 Q | V | | | 3+30 0.0343 0.17 Q | V | | | 3+35 0.0356 0.19 Q | V | | | 3+40 0.0370 0.20 Q | V | | | 3+45 0.0384 0.21 Q | V | | | 3+50 0.0399 0.22 Q | V | | | 3+55 0.0414 0.22 Q | V | | | 4+ 0 0.0430 0.23 Q | V | | | 4+ 5 0.0446 0.24 Q | V | | | 4+10 0.0463 0.25 Q | V | | | 4+15 0.0481 0.26 |Q | V | | | 4+20 0.0500 0.27 |Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+25 0.0520 0.29 |Q | V| | | 4+30 0.0540 0.30 |Q | V | | 4+35 0.0562 0.31 |Q | |V | | 4+40 0.0584 0.32 |Q | | V | | 4+45 0.0607 0.33 |Q | | V | | 4+50 0.0631 0.35 |Q | | V | | 4+55 0.0655 0.35 |Q | | V | | 5+ 0 0.0680 0.37 |Q | | V | | 5+ 5 0.0707 0.38 |Q | | V | | 5+10 0.0737 0.43 |Q | | V | | 5+15 0.0771 0.49 |Q | | V| | 5+20 0.0809 0.56 | Q | | |V | 5+25 0.0852 0.62 | Q | | | V | 5+30 0.0902 0.72 | Q | | | V | 5+35 0.0956 0.79 | Q | | | V | 5+40 0.0991 0.51 | Q | | | V | 5+45 0.1012 0.30 |Q | | | V | 5+50 0.1024 0.18 Q | | | V| 5+55 0.1032 0.12 Q | | | V| 6+ 0 0.1038 0.08 Q | | | V| 6+ 5 0.1041 0.05 Q | | | V| 6+10 0.1043 0.02 Q | | | V| 6+15 0.1043 0.01 Q | | | V| 6+20 0.1044 0.00 Q | | | V| 6+25 0.1044 0.00 Q | | | V| 6+30 0.1044 0.00 Q | | | V| 6+35 0.1044 0.00 Q | | | V| 6+40 0.1044 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b245.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
5 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.60 2.14
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 4.00 5.36
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.162(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.162(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.810 0.191 1.000 0.191 Sum (F) = 0.191
Area averaged mean soil loss (F) (In/Hr) = 0.191
Minimum soil loss rate ((In/Hr)) = 0.096
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.017 ( 0.339) 0.006 0.012 2 0.17 0.07 0.017 ( 0.338) 0.006 0.012 3 0.25 0.07 0.017 ( 0.337) 0.006 0.012 4 0.33 0.10 0.026 ( 0.335) 0.008 0.018 5 0.42 0.10 0.026 ( 0.334) 0.008 0.018 6 0.50 0.10 0.026 ( 0.333) 0.008 0.018 7 0.58 0.10 0.026 ( 0.331) 0.008 0.018 8 0.67 0.10 0.026 ( 0.330) 0.008 0.018 9 0.75 0.10 0.026 ( 0.329) 0.008 0.018 10 0.83 0.13 0.035 ( 0.327) 0.011 0.024 11 0.92 0.13 0.035 ( 0.326) 0.011 0.024 12 1.00 0.13 0.035 ( 0.325) 0.011 0.024 13 1.08 0.10 0.026 ( 0.324) 0.008 0.018 14 1.17 0.10 0.026 ( 0.322) 0.008 0.018 15 1.25 0.10 0.026 ( 0.321) 0.008 0.018 16 1.33 0.10 0.026 ( 0.320) 0.008 0.018 17 1.42 0.10 0.026 ( 0.318) 0.008 0.018 18 1.50 0.10 0.026 ( 0.317) 0.008 0.018 19 1.58 0.10 0.026 ( 0.316) 0.008 0.018 20 1.67 0.10 0.026 ( 0.315) 0.008 0.018 21 1.75 0.10 0.026 ( 0.313) 0.008 0.018 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.13 0.035 ( 0.312) 0.011 0.024 23 1.92 0.13 0.035 ( 0.311) 0.011 0.024 24 2.00 0.13 0.035 ( 0.310) 0.011 0.024 25 2.08 0.13 0.035 ( 0.308) 0.011 0.024 26 2.17 0.13 0.035 ( 0.307) 0.011 0.024 27 2.25 0.13 0.035 ( 0.306) 0.011 0.024 28 2.33 0.13 0.035 ( 0.305) 0.011 0.024 29 2.42 0.13 0.035 ( 0.303) 0.011 0.024 30 2.50 0.13 0.035 ( 0.302) 0.011 0.024 31 2.58 0.17 0.043 ( 0.301) 0.014 0.029 32 2.67 0.17 0.043 ( 0.300) 0.014 0.029 33 2.75 0.17 0.043 ( 0.298) 0.014 0.029 34 2.83 0.17 0.043 ( 0.297) 0.014 0.029 35 2.92 0.17 0.043 ( 0.296) 0.014 0.029 36 3.00 0.17 0.043 ( 0.295) 0.014 0.029 37 3.08 0.17 0.043 ( 0.294) 0.014 0.029 38 3.17 0.17 0.043 ( 0.292) 0.014 0.029 39 3.25 0.17 0.043 ( 0.291) 0.014 0.029 40 3.33 0.17 0.043 ( 0.290) 0.014 0.029 41 3.42 0.17 0.043 ( 0.289) 0.014 0.029 42 3.50 0.17 0.043 ( 0.288) 0.014 0.029 43 3.58 0.17 0.043 ( 0.286) 0.014 0.029 44 3.67 0.17 0.043 ( 0.285) 0.014 0.029 45 3.75 0.17 0.043 ( 0.284) 0.014 0.029 46 3.83 0.20 0.052 ( 0.283) 0.017 0.035 47 3.92 0.20 0.052 ( 0.282) 0.017 0.035 48 4.00 0.20 0.052 ( 0.280) 0.017 0.035 49 4.08 0.20 0.052 ( 0.279) 0.017 0.035 50 4.17 0.20 0.052 ( 0.278) 0.017 0.035 51 4.25 0.20 0.052 ( 0.277) 0.017 0.035 52 4.33 0.23 0.061 ( 0.276) 0.019 0.041 53 4.42 0.23 0.061 ( 0.274) 0.019 0.041 54 4.50 0.23 0.061 ( 0.273) 0.019 0.041 55 4.58 0.23 0.061 ( 0.272) 0.019 0.041 56 4.67 0.23 0.061 ( 0.271) 0.019 0.041 57 4.75 0.23 0.061 ( 0.270) 0.019 0.041 58 4.83 0.27 0.069 ( 0.269) 0.022 0.047 59 4.92 0.27 0.069 ( 0.267) 0.022 0.047 60 5.00 0.27 0.069 ( 0.266) 0.022 0.047 61 5.08 0.20 0.052 ( 0.265) 0.017 0.035 62 5.17 0.20 0.052 ( 0.264) 0.017 0.035 63 5.25 0.20 0.052 ( 0.263) 0.017 0.035 64 5.33 0.23 0.061 ( 0.262) 0.019 0.041 65 5.42 0.23 0.061 ( 0.260) 0.019 0.041 66 5.50 0.23 0.061 ( 0.259) 0.019 0.041 67 5.58 0.27 0.069 ( 0.258) 0.022 0.047 68 5.67 0.27 0.069 ( 0.257) 0.022 0.047 69 5.75 0.27 0.069 ( 0.256) 0.022 0.047 70 5.83 0.27 0.069 ( 0.255) 0.022 0.047 71 5.92 0.27 0.069 ( 0.254) 0.022 0.047 72 6.00 0.27 0.069 ( 0.253) 0.022 0.047 73 6.08 0.30 0.078 ( 0.251) 0.025 0.053 74 6.17 0.30 0.078 ( 0.250) 0.025 0.053 75 6.25 0.30 0.078 ( 0.249) 0.025 0.053 76 6.33 0.30 0.078 ( 0.248) 0.025 0.053 77 6.42 0.30 0.078 ( 0.247) 0.025 0.053 78 6.50 0.30 0.078 ( 0.246) 0.025 0.053 79 6.58 0.33 0.086 ( 0.245) 0.028 0.059 80 6.67 0.33 0.086 ( 0.244) 0.028 0.059 81 6.75 0.33 0.086 ( 0.243) 0.028 0.059 82 6.83 0.33 0.086 ( 0.241) 0.028 0.059 83 6.92 0.33 0.086 ( 0.240) 0.028 0.059 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 84 7.00 0.33 0.086 ( 0.239) 0.028 0.059 85 7.08 0.33 0.086 ( 0.238) 0.028 0.059 86 7.17 0.33 0.086 ( 0.237) 0.028 0.059 87 7.25 0.33 0.086 ( 0.236) 0.028 0.059 88 7.33 0.37 0.095 ( 0.235) 0.030 0.065 89 7.42 0.37 0.095 ( 0.234) 0.030 0.065 90 7.50 0.37 0.095 ( 0.233) 0.030 0.065 91 7.58 0.40 0.104 ( 0.232) 0.033 0.071 92 7.67 0.40 0.104 ( 0.231) 0.033 0.071 93 7.75 0.40 0.104 ( 0.230) 0.033 0.071 94 7.83 0.43 0.112 ( 0.229) 0.036 0.076 95 7.92 0.43 0.112 ( 0.227) 0.036 0.076 96 8.00 0.43 0.112 ( 0.226) 0.036 0.076 97 8.08 0.50 0.130 ( 0.225) 0.042 0.088 98 8.17 0.50 0.130 ( 0.224) 0.042 0.088 99 8.25 0.50 0.130 ( 0.223) 0.042 0.088 100 8.33 0.50 0.130 ( 0.222) 0.042 0.088 101 8.42 0.50 0.130 ( 0.221) 0.042 0.088 102 8.50 0.50 0.130 ( 0.220) 0.042 0.088 103 8.58 0.53 0.138 ( 0.219) 0.044 0.094 104 8.67 0.53 0.138 ( 0.218) 0.044 0.094 105 8.75 0.53 0.138 ( 0.217) 0.044 0.094 106 8.83 0.57 0.147 ( 0.216) 0.047 0.100 107 8.92 0.57 0.147 ( 0.215) 0.047 0.100 108 9.00 0.57 0.147 ( 0.214) 0.047 0.100 109 9.08 0.63 0.164 ( 0.213) 0.053 0.112 110 9.17 0.63 0.164 ( 0.212) 0.053 0.112 111 9.25 0.63 0.164 ( 0.211) 0.053 0.112 112 9.33 0.67 0.173 ( 0.210) 0.055 0.118 113 9.42 0.67 0.173 ( 0.209) 0.055 0.118 114 9.50 0.67 0.173 ( 0.208) 0.055 0.118 115 9.58 0.70 0.182 ( 0.207) 0.058 0.124 116 9.67 0.70 0.182 ( 0.206) 0.058 0.124 117 9.75 0.70 0.182 ( 0.205) 0.058 0.124 118 9.83 0.73 0.190 ( 0.204) 0.061 0.129 119 9.92 0.73 0.190 ( 0.203) 0.061 0.129 120 10.00 0.73 0.190 ( 0.202) 0.061 0.129 121 10.08 0.50 0.130 ( 0.201) 0.042 0.088 122 10.17 0.50 0.130 ( 0.200) 0.042 0.088 123 10.25 0.50 0.130 ( 0.199) 0.042 0.088 124 10.33 0.50 0.130 ( 0.198) 0.042 0.088 125 10.42 0.50 0.130 ( 0.197) 0.042 0.088 126 10.50 0.50 0.130 ( 0.196) 0.042 0.088 127 10.58 0.67 0.173 ( 0.195) 0.055 0.118 128 10.67 0.67 0.173 ( 0.194) 0.055 0.118 129 10.75 0.67 0.173 ( 0.193) 0.055 0.118 130 10.83 0.67 0.173 ( 0.192) 0.055 0.118 131 10.92 0.67 0.173 ( 0.191) 0.055 0.118 132 11.00 0.67 0.173 ( 0.191) 0.055 0.118 133 11.08 0.63 0.164 ( 0.190) 0.053 0.112 134 11.17 0.63 0.164 ( 0.189) 0.053 0.112 135 11.25 0.63 0.164 ( 0.188) 0.053 0.112 136 11.33 0.63 0.164 ( 0.187) 0.053 0.112 137 11.42 0.63 0.164 ( 0.186) 0.053 0.112 138 11.50 0.63 0.164 ( 0.185) 0.053 0.112 139 11.58 0.57 0.147 ( 0.184) 0.047 0.100 140 11.67 0.57 0.147 ( 0.183) 0.047 0.100 141 11.75 0.57 0.147 ( 0.182) 0.047 0.100 142 11.83 0.60 0.156 ( 0.181) 0.050 0.106 143 11.92 0.60 0.156 ( 0.180) 0.050 0.106 144 12.00 0.60 0.156 ( 0.179) 0.050 0.106 145 12.08 0.83 0.216 ( 0.179) 0.069 0.147 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 146 12.17 0.83 0.216 ( 0.178) 0.069 0.147 147 12.25 0.83 0.216 ( 0.177) 0.069 0.147 148 12.33 0.87 0.225 ( 0.176) 0.072 0.153 149 12.42 0.87 0.225 ( 0.175) 0.072 0.153 150 12.50 0.87 0.225 ( 0.174) 0.072 0.153 151 12.58 0.93 0.242 ( 0.173) 0.077 0.165 152 12.67 0.93 0.242 ( 0.172) 0.077 0.165 153 12.75 0.93 0.242 ( 0.172) 0.077 0.165 154 12.83 0.97 0.251 ( 0.171) 0.080 0.171 155 12.92 0.97 0.251 ( 0.170) 0.080 0.171 156 13.00 0.97 0.251 ( 0.169) 0.080 0.171 157 13.08 1.13 0.294 ( 0.168) 0.094 0.200 158 13.17 1.13 0.294 ( 0.167) 0.094 0.200 159 13.25 1.13 0.294 ( 0.166) 0.094 0.200 160 13.33 1.13 0.294 ( 0.166) 0.094 0.200 161 13.42 1.13 0.294 ( 0.165) 0.094 0.200 162 13.50 1.13 0.294 ( 0.164) 0.094 0.200 163 13.58 0.77 0.199 ( 0.163) 0.064 0.135 164 13.67 0.77 0.199 ( 0.162) 0.064 0.135 165 13.75 0.77 0.199 ( 0.161) 0.064 0.135 166 13.83 0.77 0.199 ( 0.161) 0.064 0.135 167 13.92 0.77 0.199 ( 0.160) 0.064 0.135 168 14.00 0.77 0.199 ( 0.159) 0.064 0.135 169 14.08 0.90 0.234 ( 0.158) 0.075 0.159 170 14.17 0.90 0.234 ( 0.157) 0.075 0.159 171 14.25 0.90 0.234 ( 0.157) 0.075 0.159 172 14.33 0.87 0.225 ( 0.156) 0.072 0.153 173 14.42 0.87 0.225 ( 0.155) 0.072 0.153 174 14.50 0.87 0.225 ( 0.154) 0.072 0.153 175 14.58 0.87 0.225 ( 0.153) 0.072 0.153 176 14.67 0.87 0.225 ( 0.153) 0.072 0.153 177 14.75 0.87 0.225 ( 0.152) 0.072 0.153 178 14.83 0.83 0.216 ( 0.151) 0.069 0.147 179 14.92 0.83 0.216 ( 0.150) 0.069 0.147 180 15.00 0.83 0.216 ( 0.149) 0.069 0.147 181 15.08 0.80 0.208 ( 0.149) 0.066 0.141 182 15.17 0.80 0.208 ( 0.148) 0.066 0.141 183 15.25 0.80 0.208 ( 0.147) 0.066 0.141 184 15.33 0.77 0.199 ( 0.146) 0.064 0.135 185 15.42 0.77 0.199 ( 0.146) 0.064 0.135 186 15.50 0.77 0.199 ( 0.145) 0.064 0.135 187 15.58 0.63 0.164 ( 0.144) 0.053 0.112 188 15.67 0.63 0.164 ( 0.143) 0.053 0.112 189 15.75 0.63 0.164 ( 0.143) 0.053 0.112 190 15.83 0.63 0.164 ( 0.142) 0.053 0.112 191 15.92 0.63 0.164 ( 0.141) 0.053 0.112 192 16.00 0.63 0.164 ( 0.141) 0.053 0.112 193 16.08 0.13 0.035 ( 0.140) 0.011 0.024 194 16.17 0.13 0.035 ( 0.139) 0.011 0.024 195 16.25 0.13 0.035 ( 0.138) 0.011 0.024 196 16.33 0.13 0.035 ( 0.138) 0.011 0.024 197 16.42 0.13 0.035 ( 0.137) 0.011 0.024 198 16.50 0.13 0.035 ( 0.136) 0.011 0.024 199 16.58 0.10 0.026 ( 0.136) 0.008 0.018 200 16.67 0.10 0.026 ( 0.135) 0.008 0.018 201 16.75 0.10 0.026 ( 0.134) 0.008 0.018 202 16.83 0.10 0.026 ( 0.134) 0.008 0.018 203 16.92 0.10 0.026 ( 0.133) 0.008 0.018 204 17.00 0.10 0.026 ( 0.132) 0.008 0.018 205 17.08 0.17 0.043 ( 0.131) 0.014 0.029 206 17.17 0.17 0.043 ( 0.131) 0.014 0.029 207 17.25 0.17 0.043 ( 0.130) 0.014 0.029 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 208 17.33 0.17 0.043 ( 0.130) 0.014 0.029 209 17.42 0.17 0.043 ( 0.129) 0.014 0.029 210 17.50 0.17 0.043 ( 0.128) 0.014 0.029 211 17.58 0.17 0.043 ( 0.128) 0.014 0.029 212 17.67 0.17 0.043 ( 0.127) 0.014 0.029 213 17.75 0.17 0.043 ( 0.126) 0.014 0.029 214 17.83 0.13 0.035 ( 0.126) 0.011 0.024 215 17.92 0.13 0.035 ( 0.125) 0.011 0.024 216 18.00 0.13 0.035 ( 0.124) 0.011 0.024 217 18.08 0.13 0.035 ( 0.124) 0.011 0.024 218 18.17 0.13 0.035 ( 0.123) 0.011 0.024 219 18.25 0.13 0.035 ( 0.123) 0.011 0.024 220 18.33 0.13 0.035 ( 0.122) 0.011 0.024 221 18.42 0.13 0.035 ( 0.121) 0.011 0.024 222 18.50 0.13 0.035 ( 0.121) 0.011 0.024 223 18.58 0.10 0.026 ( 0.120) 0.008 0.018 224 18.67 0.10 0.026 ( 0.120) 0.008 0.018 225 18.75 0.10 0.026 ( 0.119) 0.008 0.018 226 18.83 0.07 0.017 ( 0.119) 0.006 0.012 227 18.92 0.07 0.017 ( 0.118) 0.006 0.012 228 19.00 0.07 0.017 ( 0.117) 0.006 0.012 229 19.08 0.10 0.026 ( 0.117) 0.008 0.018 230 19.17 0.10 0.026 ( 0.116) 0.008 0.018 231 19.25 0.10 0.026 ( 0.116) 0.008 0.018 232 19.33 0.13 0.035 ( 0.115) 0.011 0.024 233 19.42 0.13 0.035 ( 0.115) 0.011 0.024 234 19.50 0.13 0.035 ( 0.114) 0.011 0.024 235 19.58 0.10 0.026 ( 0.114) 0.008 0.018 236 19.67 0.10 0.026 ( 0.113) 0.008 0.018 237 19.75 0.10 0.026 ( 0.113) 0.008 0.018 238 19.83 0.07 0.017 ( 0.112) 0.006 0.012 239 19.92 0.07 0.017 ( 0.112) 0.006 0.012 240 20.00 0.07 0.017 ( 0.111) 0.006 0.012 241 20.08 0.10 0.026 ( 0.111) 0.008 0.018 242 20.17 0.10 0.026 ( 0.110) 0.008 0.018 243 20.25 0.10 0.026 ( 0.110) 0.008 0.018 244 20.33 0.10 0.026 ( 0.109) 0.008 0.018 245 20.42 0.10 0.026 ( 0.109) 0.008 0.018 246 20.50 0.10 0.026 ( 0.108) 0.008 0.018 247 20.58 0.10 0.026 ( 0.108) 0.008 0.018 248 20.67 0.10 0.026 ( 0.107) 0.008 0.018 249 20.75 0.10 0.026 ( 0.107) 0.008 0.018 250 20.83 0.07 0.017 ( 0.106) 0.006 0.012 251 20.92 0.07 0.017 ( 0.106) 0.006 0.012 252 21.00 0.07 0.017 ( 0.106) 0.006 0.012 253 21.08 0.10 0.026 ( 0.105) 0.008 0.018 254 21.17 0.10 0.026 ( 0.105) 0.008 0.018 255 21.25 0.10 0.026 ( 0.104) 0.008 0.018 256 21.33 0.07 0.017 ( 0.104) 0.006 0.012 257 21.42 0.07 0.017 ( 0.104) 0.006 0.012 258 21.50 0.07 0.017 ( 0.103) 0.006 0.012 259 21.58 0.10 0.026 ( 0.103) 0.008 0.018 260 21.67 0.10 0.026 ( 0.102) 0.008 0.018 261 21.75 0.10 0.026 ( 0.102) 0.008 0.018 262 21.83 0.07 0.017 ( 0.102) 0.006 0.012 263 21.92 0.07 0.017 ( 0.101) 0.006 0.012 264 22.00 0.07 0.017 ( 0.101) 0.006 0.012 265 22.08 0.10 0.026 ( 0.101) 0.008 0.018 266 22.17 0.10 0.026 ( 0.100) 0.008 0.018 267 22.25 0.10 0.026 ( 0.100) 0.008 0.018 268 22.33 0.07 0.017 ( 0.100) 0.006 0.012 269 22.42 0.07 0.017 ( 0.099) 0.006 0.012 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 270 22.50 0.07 0.017 ( 0.099) 0.006 0.012 271 22.58 0.07 0.017 ( 0.099) 0.006 0.012 272 22.67 0.07 0.017 ( 0.099) 0.006 0.012 273 22.75 0.07 0.017 ( 0.098) 0.006 0.012 274 22.83 0.07 0.017 ( 0.098) 0.006 0.012 275 22.92 0.07 0.017 ( 0.098) 0.006 0.012 276 23.00 0.07 0.017 ( 0.098) 0.006 0.012 277 23.08 0.07 0.017 ( 0.097) 0.006 0.012 278 23.17 0.07 0.017 ( 0.097) 0.006 0.012 279 23.25 0.07 0.017 ( 0.097) 0.006 0.012 280 23.33 0.07 0.017 ( 0.097) 0.006 0.012 281 23.42 0.07 0.017 ( 0.097) 0.006 0.012 282 23.50 0.07 0.017 ( 0.096) 0.006 0.012 283 23.58 0.07 0.017 ( 0.096) 0.006 0.012 284 23.67 0.07 0.017 ( 0.096) 0.006 0.012 285 23.75 0.07 0.017 ( 0.096) 0.006 0.012 286 23.83 0.07 0.017 ( 0.096) 0.006 0.012 287 23.92 0.07 0.017 ( 0.096) 0.006 0.012 288 24.00 0.07 0.017 ( 0.096) 0.006 0.012 (Loss Rate Not Used)
Sum = 100.0 Sum = 17.6 Flood volume = Effective rainfall 1.47(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.69(In)
Total soil loss = 0.077(Ac.Ft)
Total rainfall = 2.16(In)
Flood volume = 7151.6 Cubic Feet
Total soil loss = 3365.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.270(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0002 0.01 Q | | | | 0+20 0.0003 0.02 Q | | | | 0+25 0.0004 0.02 Q | | | | 0+30 0.0006 0.02 Q | | | | 0+35 0.0007 0.02 Q | | | | 0+40 0.0009 0.02 Q | | | | 0+45 0.0010 0.02 Q | | | | 0+50 0.0012 0.02 Q | | | | 0+55 0.0014 0.03 Q | | | | 1+ 0 0.0016 0.03 Q | | | | 1+ 5 0.0018 0.03 Q | | | | 1+10 0.0020 0.03 Q | | | | 1+15 0.0022 0.03 Q | | | | 1+20 0.0024 0.02 Q | | | | 1+25 0.0025 0.02 Q | | | | 1+30 0.0027 0.02 Q | | | | 1+35 0.0028 0.02 Q | | | | 1+40 0.0030 0.02 Q | | | | 1+45 0.0032 0.02 Q | | | | 1+50 0.0033 0.02 Q | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 1+55 0.0035 0.03 Q | | | | 2+ 0 0.0037 0.03 Q | | | | 2+ 5 0.0040 0.03 Q | | | | 2+10 0.0042 0.03 QV | | | | 2+15 0.0044 0.03 QV | | | | 2+20 0.0046 0.03 QV | | | | 2+25 0.0048 0.03 QV | | | | 2+30 0.0051 0.03 QV | | | | 2+35 0.0053 0.03 QV | | | | 2+40 0.0055 0.04 QV | | | | 2+45 0.0058 0.04 QV | | | | 2+50 0.0061 0.04 QV | | | | 2+55 0.0063 0.04 QV | | | | 3+ 0 0.0066 0.04 QV | | | | 3+ 5 0.0069 0.04 QV | | | | 3+10 0.0072 0.04 QV | | | | 3+15 0.0074 0.04 QV | | | | 3+20 0.0077 0.04 QV | | | | 3+25 0.0080 0.04 QV | | | | 3+30 0.0082 0.04 Q V | | | | 3+35 0.0085 0.04 Q V | | | | 3+40 0.0088 0.04 Q V | | | | 3+45 0.0091 0.04 Q V | | | | 3+50 0.0093 0.04 Q V | | | | 3+55 0.0097 0.04 Q V | | | | 4+ 0 0.0100 0.05 Q V | | | | 4+ 5 0.0103 0.05 Q V | | | | 4+10 0.0106 0.05 Q V | | | | 4+15 0.0109 0.05 Q V | | | | 4+20 0.0113 0.05 Q V | | | | 4+25 0.0116 0.05 Q V | | | | 4+30 0.0120 0.05 Q V | | | | 4+35 0.0124 0.05 Q V | | | | 4+40 0.0128 0.06 Q V | | | | 4+45 0.0132 0.06 Q V | | | | 4+50 0.0135 0.06 Q V | | | | 4+55 0.0140 0.06 Q V | | | | 5+ 0 0.0144 0.06 Q V | | | | 5+ 5 0.0148 0.06 Q V | | | | 5+10 0.0152 0.05 Q V | | | | 5+15 0.0155 0.05 Q V | | | | 5+20 0.0159 0.05 Q V | | | | 5+25 0.0162 0.05 Q V | | | | 5+30 0.0166 0.05 Q V | | | | 5+35 0.0170 0.06 Q V | | | | 5+40 0.0174 0.06 Q V | | | | 5+45 0.0178 0.06 Q V | | | | 5+50 0.0183 0.06 Q V | | | | 5+55 0.0187 0.06 Q V | | | | 6+ 0 0.0191 0.06 Q V | | | | 6+ 5 0.0196 0.06 Q V | | | | 6+10 0.0201 0.07 Q V | | | | 6+15 0.0205 0.07 Q V | | | | 6+20 0.0210 0.07 Q V | | | | 6+25 0.0215 0.07 Q V | | | | 6+30 0.0220 0.07 Q V | | | | 6+35 0.0225 0.07 Q V | | | | 6+40 0.0230 0.08 Q V | | | | 6+45 0.0236 0.08 Q V | | | | 6+50 0.0241 0.08 Q V | | | | 6+55 0.0246 0.08 Q V | | | | 7+ 0 0.0252 0.08 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 7+ 5 0.0257 0.08 Q V | | | | 7+10 0.0263 0.08 Q V | | | | 7+15 0.0268 0.08 Q V | | | | 7+20 0.0274 0.08 Q V | | | | 7+25 0.0280 0.08 Q V | | | | 7+30 0.0286 0.09 Q V | | | | 7+35 0.0292 0.09 Q V | | | | 7+40 0.0298 0.09 Q V | | | | 7+45 0.0304 0.09 Q V | | | | 7+50 0.0311 0.10 Q V | | | | 7+55 0.0318 0.10 Q V | | | | 8+ 0 0.0325 0.10 Q V | | | | 8+ 5 0.0332 0.10 Q V | | | | 8+10 0.0340 0.11 Q V | | | | 8+15 0.0348 0.12 Q V | | | | 8+20 0.0356 0.12 Q V | | | | 8+25 0.0364 0.12 Q V | | | | 8+30 0.0372 0.12 Q V| | | | 8+35 0.0380 0.12 Q V| | | | 8+40 0.0389 0.12 Q V| | | | 8+45 0.0398 0.13 Q V| | | | 8+50 0.0406 0.13 Q V| | | | 8+55 0.0415 0.13 Q V | | | 9+ 0 0.0425 0.13 Q V | | | 9+ 5 0.0434 0.14 Q V | | | 9+10 0.0444 0.14 Q V | | | 9+15 0.0454 0.15 Q |V | | | 9+20 0.0464 0.15 Q |V | | | 9+25 0.0475 0.15 Q |V | | | 9+30 0.0486 0.16 Q |V | | | 9+35 0.0497 0.16 Q | V | | | 9+40 0.0508 0.16 Q | V | | | 9+45 0.0519 0.17 Q | V | | | 9+50 0.0531 0.17 Q | V | | | 9+55 0.0543 0.17 Q | V | | | 10+ 0 0.0555 0.17 Q | V | | | 10+ 5 0.0566 0.17 Q | V | | | 10+10 0.0576 0.14 Q | V | | | 10+15 0.0585 0.13 Q | V | | | 10+20 0.0594 0.12 Q | V | | | 10+25 0.0602 0.12 Q | V | | | 10+30 0.0610 0.12 Q | V | | | 10+35 0.0619 0.12 Q | V | | | 10+40 0.0628 0.14 Q | V | | | 10+45 0.0639 0.15 Q | V | | | 10+50 0.0650 0.16 Q | V | | | 10+55 0.0660 0.16 Q | V | | | 11+ 0 0.0671 0.16 Q | V | | | 11+ 5 0.0682 0.16 Q | V | | | 11+10 0.0693 0.15 Q | V | | | 11+15 0.0703 0.15 Q | V | | | 11+20 0.0714 0.15 Q | V | | | 11+25 0.0724 0.15 Q | V | | | 11+30 0.0735 0.15 Q | V | | | 11+35 0.0745 0.15 Q | V | | | 11+40 0.0755 0.14 Q | V | | | 11+45 0.0764 0.14 Q | V | | | 11+50 0.0774 0.14 Q | V | | | 11+55 0.0783 0.14 Q | V| | | 12+ 0 0.0793 0.14 Q | V| | | 12+ 5 0.0803 0.15 Q | V| | | 12+10 0.0815 0.17 Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+15 0.0828 0.19 Q | V | | 12+20 0.0842 0.19 Q | V | | 12+25 0.0856 0.20 Q | V | | 12+30 0.0870 0.20 Q | |V | | 12+35 0.0884 0.21 Q | |V | | 12+40 0.0899 0.22 Q | |V | | 12+45 0.0914 0.22 Q | | V | | 12+50 0.0929 0.22 Q | | V | | 12+55 0.0945 0.23 Q | | V | | 13+ 0 0.0960 0.23 Q | | V | | 13+ 5 0.0976 0.23 Q | | V | | 13+10 0.0994 0.25 |Q | | V | | 13+15 0.1012 0.26 |Q | | V | | 13+20 0.1030 0.27 |Q | | V | | 13+25 0.1049 0.27 |Q | | V | | 13+30 0.1067 0.27 |Q | | V | | 13+35 0.1086 0.26 |Q | | V | | 13+40 0.1101 0.22 Q | | V | | 13+45 0.1114 0.20 Q | | V | | 13+50 0.1127 0.19 Q | | V | | 13+55 0.1140 0.19 Q | | V | | 14+ 0 0.1153 0.18 Q | | V | | 14+ 5 0.1166 0.19 Q | | V | | 14+10 0.1180 0.20 Q | | V | | 14+15 0.1194 0.21 Q | | V| | 14+20 0.1209 0.21 Q | | V| | 14+25 0.1223 0.21 Q | | V| | 14+30 0.1237 0.21 Q | | V | 14+35 0.1251 0.21 Q | | V | 14+40 0.1266 0.21 Q | | V | 14+45 0.1280 0.21 Q | | |V | 14+50 0.1294 0.21 Q | | |V | 14+55 0.1308 0.20 Q | | |V | 15+ 0 0.1322 0.20 Q | | | V | 15+ 5 0.1335 0.20 Q | | | V | 15+10 0.1349 0.19 Q | | | V | 15+15 0.1362 0.19 Q | | | V | 15+20 0.1375 0.19 Q | | | V | 15+25 0.1388 0.19 Q | | | V | 15+30 0.1401 0.18 Q | | | V | 15+35 0.1413 0.18 Q | | | V | 15+40 0.1425 0.16 Q | | | V | 15+45 0.1435 0.16 Q | | | V | 15+50 0.1446 0.15 Q | | | V | 15+55 0.1456 0.15 Q | | | V | 16+ 0 0.1467 0.15 Q | | | V | 16+ 5 0.1477 0.14 Q | | | V | 16+10 0.1482 0.08 Q | | | V | 16+15 0.1486 0.05 Q | | | V | 16+20 0.1489 0.04 Q | | | V | 16+25 0.1491 0.04 Q | | | V | 16+30 0.1494 0.03 Q | | | V | 16+35 0.1496 0.03 Q | | | V | 16+40 0.1498 0.03 Q | | | V | 16+45 0.1499 0.03 Q | | | V | 16+50 0.1501 0.02 Q | | | V | 16+55 0.1503 0.02 Q | | | V | 17+ 0 0.1504 0.02 Q | | | V | 17+ 5 0.1506 0.03 Q | | | V | 17+10 0.1508 0.03 Q | | | V | 17+15 0.1511 0.04 Q | | | V | 17+20 0.1514 0.04 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 17+25 0.1516 0.04 Q | | | V | 17+30 0.1519 0.04 Q | | | V | 17+35 0.1522 0.04 Q | | | V | 17+40 0.1524 0.04 Q | | | V | 17+45 0.1527 0.04 Q | | | V | 17+50 0.1530 0.04 Q | | | V | 17+55 0.1532 0.04 Q | | | V | 18+ 0 0.1535 0.03 Q | | | V | 18+ 5 0.1537 0.03 Q | | | V | 18+10 0.1539 0.03 Q | | | V | 18+15 0.1541 0.03 Q | | | V | 18+20 0.1543 0.03 Q | | | V | 18+25 0.1546 0.03 Q | | | V | 18+30 0.1548 0.03 Q | | | V | 18+35 0.1550 0.03 Q | | | V | 18+40 0.1552 0.03 Q | | | V | 18+45 0.1554 0.03 Q | | | V | 18+50 0.1555 0.02 Q | | | V | 18+55 0.1557 0.02 Q | | | V | 19+ 0 0.1558 0.02 Q | | | V | 19+ 5 0.1559 0.02 Q | | | V | 19+10 0.1560 0.02 Q | | | V | 19+15 0.1562 0.02 Q | | | V | 19+20 0.1564 0.02 Q | | | V | 19+25 0.1566 0.03 Q | | | V | 19+30 0.1568 0.03 Q | | | V | 19+35 0.1570 0.03 Q | | | V | 19+40 0.1572 0.03 Q | | | V | 19+45 0.1573 0.03 Q | | | V | 19+50 0.1575 0.02 Q | | | V | 19+55 0.1576 0.02 Q | | | V | 20+ 0 0.1577 0.02 Q | | | V | 20+ 5 0.1579 0.02 Q | | | V | 20+10 0.1580 0.02 Q | | | V | 20+15 0.1582 0.02 Q | | | V | 20+20 0.1583 0.02 Q | | | V | 20+25 0.1585 0.02 Q | | | V | 20+30 0.1587 0.02 Q | | | V | 20+35 0.1588 0.02 Q | | | V | 20+40 0.1590 0.02 Q | | | V | 20+45 0.1591 0.02 Q | | | V | 20+50 0.1593 0.02 Q | | | V | 20+55 0.1594 0.02 Q | | | V | 21+ 0 0.1596 0.02 Q | | | V | 21+ 5 0.1597 0.02 Q | | | V | 21+10 0.1598 0.02 Q | | | V | 21+15 0.1600 0.02 Q | | | V | 21+20 0.1601 0.02 Q | | | V| 21+25 0.1603 0.02 Q | | | V| 21+30 0.1604 0.02 Q | | | V| 21+35 0.1605 0.02 Q | | | V| 21+40 0.1606 0.02 Q | | | V| 21+45 0.1608 0.02 Q | | | V| 21+50 0.1609 0.02 Q | | | V| 21+55 0.1611 0.02 Q | | | V| 22+ 0 0.1612 0.02 Q | | | V| 22+ 5 0.1613 0.02 Q | | | V| 22+10 0.1615 0.02 Q | | | V| 22+15 0.1616 0.02 Q | | | V| 22+20 0.1618 0.02 Q | | | V| 22+25 0.1619 0.02 Q | | | V| 22+30 0.1620 0.02 Q | | | V| PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22+35 0.1621 0.02 Q | | | V| 22+40 0.1622 0.02 Q | | | V| 22+45 0.1624 0.02 Q | | | V| 22+50 0.1625 0.02 Q | | | V| 22+55 0.1626 0.02 Q | | | V| 23+ 0 0.1627 0.02 Q | | | V| 23+ 5 0.1628 0.02 Q | | | V| 23+10 0.1629 0.02 Q | | | V| 23+15 0.1630 0.02 Q | | | V| 23+20 0.1631 0.02 Q | | | V| 23+25 0.1632 0.02 Q | | | V| 23+30 0.1633 0.02 Q | | | V| 23+35 0.1634 0.02 Q | | | V| 23+40 0.1636 0.02 Q | | | V| 23+45 0.1637 0.02 Q | | | V| 23+50 0.1638 0.02 Q | | | V| 23+55 0.1639 0.02 Q | | | V| 24+ 0 0.1640 0.02 Q | | | V| 24+ 5 0.1641 0.01 Q | | | V| 24+10 0.1641 0.01 Q | | | V| 24+15 0.1642 0.00 Q | | | V| 24+20 0.1642 0.00 Q | | | V| 24+25 0.1642 0.00 Q | | | V| 24+30 0.1642 0.00 Q | | | V| 24+35 0.1642 0.00 Q | | | V| 24+40 0.1642 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b110.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
10 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.50 0.67
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.10 1.47
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.747(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.747(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.810 0.138 1.000 0.138 Sum (F) = 0.138
Area averaged mean soil loss (F) (In/Hr) = 0.138
Minimum soil loss rate ((In/Hr)) = 0.069
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5500 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.30 0.296 ( 0.138) 0.095 0.201 2 0.17 4.20 0.376 ( 0.138) 0.120 0.256 3 0.25 4.40 0.394 ( 0.138) 0.126 0.268 4 0.33 4.80 0.430 ( 0.138) 0.138 0.293 5 0.42 5.20 0.466 0.138 ( 0.149) 0.328 6 0.50 6.20 0.556 0.138 ( 0.178) 0.417 7 0.58 6.80 0.609 0.138 ( 0.195) 0.471 8 0.67 8.80 0.789 0.138 ( 0.252) 0.650 9 0.75 13.90 1.246 0.138 ( 0.399) 1.107 10 0.83 31.40 2.814 0.138 ( 0.901) 2.676 11 0.92 7.20 0.645 0.138 ( 0.206) 0.507 12 1.00 3.80 0.341 ( 0.138) 0.109 0.232 (Loss Rate Not Used)
Sum = 100.0 Sum = 7.4 Flood volume = Effective rainfall 0.62(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.13(In)
Total soil loss = 0.014(Ac.Ft)
Total rainfall = 0.75(In)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Flood volume = 3001.7 Cubic Feet
Total soil loss = 631.1 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 2.313(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0002 0.02 Q | | | | 0+10 0.0013 0.16 Q | | | | 0+15 0.0031 0.27 |Q | | | | 0+20 0.0053 0.32 |Q V | | | | 0+25 0.0079 0.37 |Q V | | | | 0+30 0.0108 0.42 |Q V | | | | 0+35 0.0142 0.50 | Q V | | | | 0+40 0.0184 0.60 | Q V | | | 0+45 0.0239 0.81 | Q | V | | | 0+50 0.0333 1.37 | Q | V| | | 0+55 0.0493 2.31 | Q| | V | | 1+ 0 0.0593 1.45 | Q | | | V | 1+ 5 0.0646 0.77 | Q | | | V | 1+10 0.0670 0.36 |Q | | | V | 1+15 0.0681 0.15 Q | | | V| 1+20 0.0685 0.07 Q | | | V| 1+25 0.0687 0.04 Q | | | V| 1+30 0.0689 0.02 Q | | | V| 1+35 0.0689 0.00 Q | | | V| 1+40 0.0689 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b310.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
10 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 3 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.80 1.07
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.80 2.41
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.211(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.211(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.810 0.138 1.000 0.138 Sum (F) = 0.138
Area averaged mean soil loss (F) (In/Hr) = 0.138
Minimum soil loss rate ((In/Hr)) = 0.069
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 1.30 0.189 ( 0.138) 0.060 0.129 2 0.17 1.30 0.189 ( 0.138) 0.060 0.129 3 0.25 1.10 0.160 ( 0.138) 0.051 0.109 4 0.33 1.50 0.218 ( 0.138) 0.070 0.148 5 0.42 1.50 0.218 ( 0.138) 0.070 0.148 6 0.50 1.80 0.262 ( 0.138) 0.084 0.178 7 0.58 1.50 0.218 ( 0.138) 0.070 0.148 8 0.67 1.80 0.262 ( 0.138) 0.084 0.178 9 0.75 1.80 0.262 ( 0.138) 0.084 0.178 10 0.83 1.50 0.218 ( 0.138) 0.070 0.148 11 0.92 1.60 0.233 ( 0.138) 0.074 0.158 12 1.00 1.80 0.262 ( 0.138) 0.084 0.178 13 1.08 2.20 0.320 ( 0.138) 0.102 0.217 14 1.17 2.20 0.320 ( 0.138) 0.102 0.217 15 1.25 2.20 0.320 ( 0.138) 0.102 0.217 16 1.33 2.00 0.291 ( 0.138) 0.093 0.198 17 1.42 2.60 0.378 ( 0.138) 0.121 0.257 18 1.50 2.70 0.392 ( 0.138) 0.126 0.267 19 1.58 2.40 0.349 ( 0.138) 0.112 0.237 20 1.67 2.70 0.392 ( 0.138) 0.126 0.267 21 1.75 3.30 0.480 0.138 ( 0.154) 0.341 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 3.10 0.451 0.138 ( 0.144) 0.312 23 1.92 2.90 0.422 ( 0.138) 0.135 0.287 24 2.00 3.00 0.436 0.138 ( 0.140) 0.298 25 2.08 3.10 0.451 0.138 ( 0.144) 0.312 26 2.17 4.20 0.611 0.138 ( 0.195) 0.472 27 2.25 5.00 0.727 0.138 ( 0.233) 0.588 28 2.33 3.50 0.509 0.138 ( 0.163) 0.370 29 2.42 6.80 0.989 0.138 ( 0.316) 0.850 30 2.50 7.30 1.061 0.138 ( 0.340) 0.923 31 2.58 8.20 1.192 0.138 ( 0.381) 1.054 32 2.67 5.90 0.858 0.138 ( 0.274) 0.719 33 2.75 2.00 0.291 ( 0.138) 0.093 0.198 34 2.83 1.80 0.262 ( 0.138) 0.084 0.178 35 2.92 1.80 0.262 ( 0.138) 0.084 0.178 36 3.00 0.60 0.087 ( 0.138) 0.028 0.059 (Loss Rate Not Used)
Sum = 100.0 Sum = 10.8 Flood volume = Effective rainfall 0.90(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.31(In)
Total soil loss = 0.034(Ac.Ft)
Total rainfall = 1.21(In)
Flood volume = 4396.6 Cubic Feet
Total soil loss = 1495.9 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 1.242(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.02 Q | | | | 0+10 0.0008 0.10 Q | | | | 0+15 0.0018 0.14 Q | | | | 0+20 0.0028 0.15 QV | | | | 0+25 0.0040 0.18 QV | | | | 0+30 0.0053 0.19 Q V | | | | 0+35 0.0068 0.21 Q V | | | | 0+40 0.0083 0.21 Q V | | | | 0+45 0.0098 0.23 Q V | | | | 0+50 0.0114 0.23 Q V | | | | 0+55 0.0129 0.22 Q V | | | | 1+ 0 0.0144 0.22 Q V | | | | 1+ 5 0.0160 0.23 Q V | | | | 1+10 0.0178 0.27 |Q V | | | | 1+15 0.0198 0.28 |Q V | | | | 1+20 0.0218 0.29 |Q V | | | | 1+25 0.0237 0.28 |Q V| | | | 1+30 0.0259 0.32 |Q V | | | 1+35 0.0282 0.34 |Q |V | | | 1+40 0.0305 0.33 |Q | V | | | 1+45 0.0330 0.36 |Q | V | | | 1+50 0.0358 0.41 |Q | V | | | 1+55 0.0387 0.41 |Q | V | | | 2+ 0 0.0414 0.40 |Q | V | | | 2+ 5 0.0442 0.40 |Q | V | | | 2+10 0.0472 0.43 |Q | V | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 2+15 0.0510 0.56 | Q | V | | 2+20 0.0556 0.66 | Q | | V | | 2+25 0.0600 0.64 | Q | | V | | 2+30 0.0662 0.91 | Q | | V | | 2+35 0.0740 1.12 | Q | | V| | 2+40 0.0825 1.24 | Q | | | V | 2+45 0.0897 1.04 | Q | | | V | 2+50 0.0939 0.62 | Q | | | V | 2+55 0.0967 0.40 |Q | | | V | 3+ 0 0.0988 0.30 |Q | | | V| 3+ 5 0.1000 0.17 Q | | | V| 3+10 0.1005 0.08 Q | | | V| 3+15 0.1008 0.04 Q | | | V| 3+20 0.1009 0.01 Q | | | V| 3+25 0.1009 0.01 Q | | | V| 3+30 0.1009 0.00 Q | | | V| 3+35 0.1009 0.00 Q | | | V| 3+40 0.1009 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b610.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
10 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.00 1.34
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 2.50 3.35
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.617(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.617(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.810 0.138 1.000 0.138 Sum (F) = 0.138
Area averaged mean soil loss (F) (In/Hr) = 0.138
Minimum soil loss rate ((In/Hr)) = 0.069
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.50 0.097 ( 0.138) 0.031 0.066 2 0.17 0.60 0.116 ( 0.138) 0.037 0.079 3 0.25 0.60 0.116 ( 0.138) 0.037 0.079 4 0.33 0.60 0.116 ( 0.138) 0.037 0.079 5 0.42 0.60 0.116 ( 0.138) 0.037 0.079 6 0.50 0.70 0.136 ( 0.138) 0.043 0.092 7 0.58 0.70 0.136 ( 0.138) 0.043 0.092 8 0.67 0.70 0.136 ( 0.138) 0.043 0.092 9 0.75 0.70 0.136 ( 0.138) 0.043 0.092 10 0.83 0.70 0.136 ( 0.138) 0.043 0.092 11 0.92 0.70 0.136 ( 0.138) 0.043 0.092 12 1.00 0.80 0.155 ( 0.138) 0.050 0.106 13 1.08 0.80 0.155 ( 0.138) 0.050 0.106 14 1.17 0.80 0.155 ( 0.138) 0.050 0.106 15 1.25 0.80 0.155 ( 0.138) 0.050 0.106 16 1.33 0.80 0.155 ( 0.138) 0.050 0.106 17 1.42 0.80 0.155 ( 0.138) 0.050 0.106 18 1.50 0.80 0.155 ( 0.138) 0.050 0.106 19 1.58 0.80 0.155 ( 0.138) 0.050 0.106 20 1.67 0.80 0.155 ( 0.138) 0.050 0.106 21 1.75 0.80 0.155 ( 0.138) 0.050 0.106 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.80 0.155 ( 0.138) 0.050 0.106 23 1.92 0.80 0.155 ( 0.138) 0.050 0.106 24 2.00 0.90 0.175 ( 0.138) 0.056 0.119 25 2.08 0.80 0.155 ( 0.138) 0.050 0.106 26 2.17 0.90 0.175 ( 0.138) 0.056 0.119 27 2.25 0.90 0.175 ( 0.138) 0.056 0.119 28 2.33 0.90 0.175 ( 0.138) 0.056 0.119 29 2.42 0.90 0.175 ( 0.138) 0.056 0.119 30 2.50 0.90 0.175 ( 0.138) 0.056 0.119 31 2.58 0.90 0.175 ( 0.138) 0.056 0.119 32 2.67 0.90 0.175 ( 0.138) 0.056 0.119 33 2.75 1.00 0.194 ( 0.138) 0.062 0.132 34 2.83 1.00 0.194 ( 0.138) 0.062 0.132 35 2.92 1.00 0.194 ( 0.138) 0.062 0.132 36 3.00 1.00 0.194 ( 0.138) 0.062 0.132 37 3.08 1.00 0.194 ( 0.138) 0.062 0.132 38 3.17 1.10 0.213 ( 0.138) 0.068 0.145 39 3.25 1.10 0.213 ( 0.138) 0.068 0.145 40 3.33 1.10 0.213 ( 0.138) 0.068 0.145 41 3.42 1.20 0.233 ( 0.138) 0.075 0.158 42 3.50 1.30 0.252 ( 0.138) 0.081 0.172 43 3.58 1.40 0.272 ( 0.138) 0.087 0.185 44 3.67 1.40 0.272 ( 0.138) 0.087 0.185 45 3.75 1.50 0.291 ( 0.138) 0.093 0.198 46 3.83 1.50 0.291 ( 0.138) 0.093 0.198 47 3.92 1.60 0.310 ( 0.138) 0.099 0.211 48 4.00 1.60 0.310 ( 0.138) 0.099 0.211 49 4.08 1.70 0.330 ( 0.138) 0.106 0.224 50 4.17 1.80 0.349 ( 0.138) 0.112 0.238 51 4.25 1.90 0.369 ( 0.138) 0.118 0.251 52 4.33 2.00 0.388 ( 0.138) 0.124 0.264 53 4.42 2.10 0.408 ( 0.138) 0.130 0.277 54 4.50 2.10 0.408 ( 0.138) 0.130 0.277 55 4.58 2.20 0.427 ( 0.138) 0.137 0.290 56 4.67 2.30 0.446 0.138 ( 0.143) 0.308 57 4.75 2.40 0.466 0.138 ( 0.149) 0.327 58 4.83 2.40 0.466 0.138 ( 0.149) 0.327 59 4.92 2.50 0.485 0.138 ( 0.155) 0.347 60 5.00 2.60 0.505 0.138 ( 0.161) 0.366 61 5.08 3.10 0.602 0.138 ( 0.193) 0.463 62 5.17 3.60 0.699 0.138 ( 0.224) 0.560 63 5.25 3.90 0.757 0.138 ( 0.242) 0.618 64 5.33 4.20 0.815 0.138 ( 0.261) 0.677 65 5.42 4.70 0.912 0.138 ( 0.292) 0.774 66 5.50 5.60 1.087 0.138 ( 0.348) 0.948 67 5.58 1.90 0.369 ( 0.138) 0.118 0.251 68 5.67 0.90 0.175 ( 0.138) 0.056 0.119 69 5.75 0.60 0.116 ( 0.138) 0.037 0.079 70 5.83 0.50 0.097 ( 0.138) 0.031 0.066 71 5.92 0.30 0.058 ( 0.138) 0.019 0.040 72 6.00 0.20 0.039 ( 0.138) 0.012 0.026 (Loss Rate Not Used)
Sum = 100.0 Sum = 14.0 Flood volume = Effective rainfall 1.17(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.45(In)
Total soil loss = 0.050(Ac.Ft)
Total rainfall = 1.62(In)
Flood volume = 5670.5 Cubic Feet
Total soil loss = 2195.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 1.059(CFS)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0001 0.01 Q | | | | 0+10 0.0004 0.05 Q | | | | 0+15 0.0010 0.08 Q | | | | 0+20 0.0017 0.10 Q | | | | 0+25 0.0024 0.10 Q | | | | 0+30 0.0031 0.11 Q | | | | 0+35 0.0039 0.12 QV | | | | 0+40 0.0047 0.12 QV | | | | 0+45 0.0056 0.12 QV | | | | 0+50 0.0064 0.12 QV | | | | 0+55 0.0073 0.12 Q V | | | | 1+ 0 0.0082 0.13 Q V | | | | 1+ 5 0.0091 0.13 Q V | | | | 1+10 0.0101 0.14 Q V | | | | 1+15 0.0110 0.14 Q V | | | | 1+20 0.0120 0.14 Q V | | | | 1+25 0.0130 0.14 Q V | | | | 1+30 0.0140 0.14 Q V | | | | 1+35 0.0149 0.14 Q V | | | | 1+40 0.0159 0.14 Q V | | | | 1+45 0.0169 0.14 Q V | | | | 1+50 0.0179 0.14 Q V | | | | 1+55 0.0189 0.14 Q V | | | | 2+ 0 0.0199 0.14 Q V | | | | 2+ 5 0.0209 0.15 Q V | | | | 2+10 0.0219 0.15 Q V | | | | 2+15 0.0230 0.15 Q V | | | | 2+20 0.0241 0.16 Q V | | | | 2+25 0.0252 0.16 Q V | | | | 2+30 0.0263 0.16 Q V | | | | 2+35 0.0274 0.16 Q V | | | | 2+40 0.0285 0.16 Q V | | | | 2+45 0.0296 0.16 Q V| | | | 2+50 0.0308 0.17 Q V| | | | 2+55 0.0320 0.18 Q V| | | | 3+ 0 0.0332 0.18 Q V | | | 3+ 5 0.0344 0.18 Q V | | | 3+10 0.0357 0.18 Q V | | | 3+15 0.0370 0.19 Q |V | | | 3+20 0.0383 0.19 Q |V | | | 3+25 0.0396 0.20 Q | V | | | 3+30 0.0411 0.21 Q | V | | | 3+35 0.0426 0.22 Q | V | | | 3+40 0.0442 0.24 Q | V | | | 3+45 0.0459 0.25 Q | V | | | 3+50 0.0477 0.26 |Q | V | | | 3+55 0.0495 0.26 |Q | V | | | 4+ 0 0.0514 0.28 |Q | V | | | 4+ 5 0.0534 0.28 |Q | V | | | 4+10 0.0554 0.30 |Q | V | | | 4+15 0.0576 0.31 |Q | V | | | 4+20 0.0598 0.33 |Q | V | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+25 0.0622 0.35 |Q | V| | | 4+30 0.0647 0.36 |Q | V| | | 4+35 0.0672 0.37 |Q | V | | 4+40 0.0699 0.38 |Q | |V | | 4+45 0.0727 0.40 |Q | | V | | 4+50 0.0756 0.42 |Q | | V | | 4+55 0.0786 0.44 |Q | | V | | 5+ 0 0.0817 0.46 |Q | | V | | 5+ 5 0.0851 0.49 |Q | | V | | 5+10 0.0891 0.57 | Q | | V | | 5+15 0.0937 0.68 | Q | | V | | 5+20 0.0991 0.77 | Q | | V | 5+25 0.1050 0.86 | Q | | | V | 5+30 0.1118 0.98 | Q | | | V | 5+35 0.1191 1.06 | Q | | | V | 5+40 0.1236 0.66 | Q | | | V | 5+45 0.1262 0.37 |Q | | | V | 5+50 0.1278 0.23 Q | | | V| 5+55 0.1288 0.15 Q | | | V| 6+ 0 0.1294 0.09 Q | | | V| 6+ 5 0.1299 0.06 Q | | | V| 6+10 0.1301 0.03 Q | | | V| 6+15 0.1301 0.01 Q | | | V| 6+20 0.1302 0.00 Q | | | V| 6+25 0.1302 0.00 Q | | | V| 6+30 0.1302 0.00 Q | | | V| 6+35 0.1302 0.00 Q | | | V| 6+40 0.1302 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b2410.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
10 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.60 2.14
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 4.00 5.36
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.587(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.587(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.810 0.138 1.000 0.138 Sum (F) = 0.138
Area averaged mean soil loss (F) (In/Hr) = 0.138
Minimum soil loss rate ((In/Hr)) = 0.069
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.021 ( 0.245) 0.007 0.014 2 0.17 0.07 0.021 ( 0.244) 0.007 0.014 3 0.25 0.07 0.021 ( 0.243) 0.007 0.014 4 0.33 0.10 0.031 ( 0.243) 0.010 0.021 5 0.42 0.10 0.031 ( 0.242) 0.010 0.021 6 0.50 0.10 0.031 ( 0.241) 0.010 0.021 7 0.58 0.10 0.031 ( 0.240) 0.010 0.021 8 0.67 0.10 0.031 ( 0.239) 0.010 0.021 9 0.75 0.10 0.031 ( 0.238) 0.010 0.021 10 0.83 0.13 0.041 ( 0.237) 0.013 0.028 11 0.92 0.13 0.041 ( 0.236) 0.013 0.028 12 1.00 0.13 0.041 ( 0.235) 0.013 0.028 13 1.08 0.10 0.031 ( 0.234) 0.010 0.021 14 1.17 0.10 0.031 ( 0.233) 0.010 0.021 15 1.25 0.10 0.031 ( 0.232) 0.010 0.021 16 1.33 0.10 0.031 ( 0.231) 0.010 0.021 17 1.42 0.10 0.031 ( 0.230) 0.010 0.021 18 1.50 0.10 0.031 ( 0.230) 0.010 0.021 19 1.58 0.10 0.031 ( 0.229) 0.010 0.021 20 1.67 0.10 0.031 ( 0.228) 0.010 0.021 21 1.75 0.10 0.031 ( 0.227) 0.010 0.021 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.13 0.041 ( 0.226) 0.013 0.028 23 1.92 0.13 0.041 ( 0.225) 0.013 0.028 24 2.00 0.13 0.041 ( 0.224) 0.013 0.028 25 2.08 0.13 0.041 ( 0.223) 0.013 0.028 26 2.17 0.13 0.041 ( 0.222) 0.013 0.028 27 2.25 0.13 0.041 ( 0.221) 0.013 0.028 28 2.33 0.13 0.041 ( 0.220) 0.013 0.028 29 2.42 0.13 0.041 ( 0.220) 0.013 0.028 30 2.50 0.13 0.041 ( 0.219) 0.013 0.028 31 2.58 0.17 0.052 ( 0.218) 0.017 0.035 32 2.67 0.17 0.052 ( 0.217) 0.017 0.035 33 2.75 0.17 0.052 ( 0.216) 0.017 0.035 34 2.83 0.17 0.052 ( 0.215) 0.017 0.035 35 2.92 0.17 0.052 ( 0.214) 0.017 0.035 36 3.00 0.17 0.052 ( 0.213) 0.017 0.035 37 3.08 0.17 0.052 ( 0.212) 0.017 0.035 38 3.17 0.17 0.052 ( 0.212) 0.017 0.035 39 3.25 0.17 0.052 ( 0.211) 0.017 0.035 40 3.33 0.17 0.052 ( 0.210) 0.017 0.035 41 3.42 0.17 0.052 ( 0.209) 0.017 0.035 42 3.50 0.17 0.052 ( 0.208) 0.017 0.035 43 3.58 0.17 0.052 ( 0.207) 0.017 0.035 44 3.67 0.17 0.052 ( 0.206) 0.017 0.035 45 3.75 0.17 0.052 ( 0.205) 0.017 0.035 46 3.83 0.20 0.062 ( 0.205) 0.020 0.042 47 3.92 0.20 0.062 ( 0.204) 0.020 0.042 48 4.00 0.20 0.062 ( 0.203) 0.020 0.042 49 4.08 0.20 0.062 ( 0.202) 0.020 0.042 50 4.17 0.20 0.062 ( 0.201) 0.020 0.042 51 4.25 0.20 0.062 ( 0.200) 0.020 0.042 52 4.33 0.23 0.072 ( 0.199) 0.023 0.049 53 4.42 0.23 0.072 ( 0.199) 0.023 0.049 54 4.50 0.23 0.072 ( 0.198) 0.023 0.049 55 4.58 0.23 0.072 ( 0.197) 0.023 0.049 56 4.67 0.23 0.072 ( 0.196) 0.023 0.049 57 4.75 0.23 0.072 ( 0.195) 0.023 0.049 58 4.83 0.27 0.083 ( 0.194) 0.026 0.056 59 4.92 0.27 0.083 ( 0.193) 0.026 0.056 60 5.00 0.27 0.083 ( 0.193) 0.026 0.056 61 5.08 0.20 0.062 ( 0.192) 0.020 0.042 62 5.17 0.20 0.062 ( 0.191) 0.020 0.042 63 5.25 0.20 0.062 ( 0.190) 0.020 0.042 64 5.33 0.23 0.072 ( 0.189) 0.023 0.049 65 5.42 0.23 0.072 ( 0.188) 0.023 0.049 66 5.50 0.23 0.072 ( 0.188) 0.023 0.049 67 5.58 0.27 0.083 ( 0.187) 0.026 0.056 68 5.67 0.27 0.083 ( 0.186) 0.026 0.056 69 5.75 0.27 0.083 ( 0.185) 0.026 0.056 70 5.83 0.27 0.083 ( 0.184) 0.026 0.056 71 5.92 0.27 0.083 ( 0.184) 0.026 0.056 72 6.00 0.27 0.083 ( 0.183) 0.026 0.056 73 6.08 0.30 0.093 ( 0.182) 0.030 0.063 74 6.17 0.30 0.093 ( 0.181) 0.030 0.063 75 6.25 0.30 0.093 ( 0.180) 0.030 0.063 76 6.33 0.30 0.093 ( 0.179) 0.030 0.063 77 6.42 0.30 0.093 ( 0.179) 0.030 0.063 78 6.50 0.30 0.093 ( 0.178) 0.030 0.063 79 6.58 0.33 0.103 ( 0.177) 0.033 0.070 80 6.67 0.33 0.103 ( 0.176) 0.033 0.070 81 6.75 0.33 0.103 ( 0.175) 0.033 0.070 82 6.83 0.33 0.103 ( 0.175) 0.033 0.070 83 6.92 0.33 0.103 ( 0.174) 0.033 0.070 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 84 7.00 0.33 0.103 ( 0.173) 0.033 0.070 85 7.08 0.33 0.103 ( 0.172) 0.033 0.070 86 7.17 0.33 0.103 ( 0.172) 0.033 0.070 87 7.25 0.33 0.103 ( 0.171) 0.033 0.070 88 7.33 0.37 0.114 ( 0.170) 0.036 0.077 89 7.42 0.37 0.114 ( 0.169) 0.036 0.077 90 7.50 0.37 0.114 ( 0.168) 0.036 0.077 91 7.58 0.40 0.124 ( 0.168) 0.040 0.084 92 7.67 0.40 0.124 ( 0.167) 0.040 0.084 93 7.75 0.40 0.124 ( 0.166) 0.040 0.084 94 7.83 0.43 0.135 ( 0.165) 0.043 0.091 95 7.92 0.43 0.135 ( 0.165) 0.043 0.091 96 8.00 0.43 0.135 ( 0.164) 0.043 0.091 97 8.08 0.50 0.155 ( 0.163) 0.050 0.106 98 8.17 0.50 0.155 ( 0.162) 0.050 0.106 99 8.25 0.50 0.155 ( 0.162) 0.050 0.106 100 8.33 0.50 0.155 ( 0.161) 0.050 0.106 101 8.42 0.50 0.155 ( 0.160) 0.050 0.106 102 8.50 0.50 0.155 ( 0.159) 0.050 0.106 103 8.58 0.53 0.166 ( 0.159) 0.053 0.113 104 8.67 0.53 0.166 ( 0.158) 0.053 0.113 105 8.75 0.53 0.166 ( 0.157) 0.053 0.113 106 8.83 0.57 0.176 ( 0.156) 0.056 0.120 107 8.92 0.57 0.176 ( 0.156) 0.056 0.120 108 9.00 0.57 0.176 ( 0.155) 0.056 0.120 109 9.08 0.63 0.197 ( 0.154) 0.063 0.134 110 9.17 0.63 0.197 ( 0.153) 0.063 0.134 111 9.25 0.63 0.197 ( 0.153) 0.063 0.134 112 9.33 0.67 0.207 ( 0.152) 0.066 0.141 113 9.42 0.67 0.207 ( 0.151) 0.066 0.141 114 9.50 0.67 0.207 ( 0.150) 0.066 0.141 115 9.58 0.70 0.217 ( 0.150) 0.070 0.148 116 9.67 0.70 0.217 ( 0.149) 0.070 0.148 117 9.75 0.70 0.217 ( 0.148) 0.070 0.148 118 9.83 0.73 0.228 ( 0.148) 0.073 0.155 119 9.92 0.73 0.228 ( 0.147) 0.073 0.155 120 10.00 0.73 0.228 ( 0.146) 0.073 0.155 121 10.08 0.50 0.155 ( 0.145) 0.050 0.106 122 10.17 0.50 0.155 ( 0.145) 0.050 0.106 123 10.25 0.50 0.155 ( 0.144) 0.050 0.106 124 10.33 0.50 0.155 ( 0.143) 0.050 0.106 125 10.42 0.50 0.155 ( 0.143) 0.050 0.106 126 10.50 0.50 0.155 ( 0.142) 0.050 0.106 127 10.58 0.67 0.207 ( 0.141) 0.066 0.141 128 10.67 0.67 0.207 ( 0.141) 0.066 0.141 129 10.75 0.67 0.207 ( 0.140) 0.066 0.141 130 10.83 0.67 0.207 ( 0.139) 0.066 0.141 131 10.92 0.67 0.207 ( 0.139) 0.066 0.141 132 11.00 0.67 0.207 ( 0.138) 0.066 0.141 133 11.08 0.63 0.197 ( 0.137) 0.063 0.134 134 11.17 0.63 0.197 ( 0.136) 0.063 0.134 135 11.25 0.63 0.197 ( 0.136) 0.063 0.134 136 11.33 0.63 0.197 ( 0.135) 0.063 0.134 137 11.42 0.63 0.197 ( 0.134) 0.063 0.134 138 11.50 0.63 0.197 ( 0.134) 0.063 0.134 139 11.58 0.57 0.176 ( 0.133) 0.056 0.120 140 11.67 0.57 0.176 ( 0.132) 0.056 0.120 141 11.75 0.57 0.176 ( 0.132) 0.056 0.120 142 11.83 0.60 0.186 ( 0.131) 0.060 0.127 143 11.92 0.60 0.186 ( 0.131) 0.060 0.127 144 12.00 0.60 0.186 ( 0.130) 0.060 0.127 145 12.08 0.83 0.259 ( 0.129) 0.083 0.176 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 146 12.17 0.83 0.259 ( 0.129) 0.083 0.176 147 12.25 0.83 0.259 ( 0.128) 0.083 0.176 148 12.33 0.87 0.269 ( 0.127) 0.086 0.183 149 12.42 0.87 0.269 ( 0.127) 0.086 0.183 150 12.50 0.87 0.269 ( 0.126) 0.086 0.183 151 12.58 0.93 0.290 ( 0.125) 0.093 0.197 152 12.67 0.93 0.290 ( 0.125) 0.093 0.197 153 12.75 0.93 0.290 ( 0.124) 0.093 0.197 154 12.83 0.97 0.300 ( 0.123) 0.096 0.204 155 12.92 0.97 0.300 ( 0.123) 0.096 0.204 156 13.00 0.97 0.300 ( 0.122) 0.096 0.204 157 13.08 1.13 0.352 ( 0.122) 0.113 0.239 158 13.17 1.13 0.352 ( 0.121) 0.113 0.239 159 13.25 1.13 0.352 ( 0.120) 0.113 0.239 160 13.33 1.13 0.352 ( 0.120) 0.113 0.239 161 13.42 1.13 0.352 ( 0.119) 0.113 0.239 162 13.50 1.13 0.352 ( 0.119) 0.113 0.239 163 13.58 0.77 0.238 ( 0.118) 0.076 0.162 164 13.67 0.77 0.238 ( 0.117) 0.076 0.162 165 13.75 0.77 0.238 ( 0.117) 0.076 0.162 166 13.83 0.77 0.238 ( 0.116) 0.076 0.162 167 13.92 0.77 0.238 ( 0.116) 0.076 0.162 168 14.00 0.77 0.238 ( 0.115) 0.076 0.162 169 14.08 0.90 0.279 ( 0.114) 0.089 0.190 170 14.17 0.90 0.279 ( 0.114) 0.089 0.190 171 14.25 0.90 0.279 ( 0.113) 0.089 0.190 172 14.33 0.87 0.269 ( 0.113) 0.086 0.183 173 14.42 0.87 0.269 ( 0.112) 0.086 0.183 174 14.50 0.87 0.269 ( 0.112) 0.086 0.183 175 14.58 0.87 0.269 ( 0.111) 0.086 0.183 176 14.67 0.87 0.269 ( 0.110) 0.086 0.183 177 14.75 0.87 0.269 ( 0.110) 0.086 0.183 178 14.83 0.83 0.259 ( 0.109) 0.083 0.176 179 14.92 0.83 0.259 ( 0.109) 0.083 0.176 180 15.00 0.83 0.259 ( 0.108) 0.083 0.176 181 15.08 0.80 0.248 ( 0.108) 0.079 0.169 182 15.17 0.80 0.248 ( 0.107) 0.079 0.169 183 15.25 0.80 0.248 ( 0.106) 0.079 0.169 184 15.33 0.77 0.238 ( 0.106) 0.076 0.162 185 15.42 0.77 0.238 ( 0.105) 0.076 0.162 186 15.50 0.77 0.238 ( 0.105) 0.076 0.162 187 15.58 0.63 0.197 ( 0.104) 0.063 0.134 188 15.67 0.63 0.197 ( 0.104) 0.063 0.134 189 15.75 0.63 0.197 ( 0.103) 0.063 0.134 190 15.83 0.63 0.197 ( 0.103) 0.063 0.134 191 15.92 0.63 0.197 ( 0.102) 0.063 0.134 192 16.00 0.63 0.197 ( 0.102) 0.063 0.134 193 16.08 0.13 0.041 ( 0.101) 0.013 0.028 194 16.17 0.13 0.041 ( 0.101) 0.013 0.028 195 16.25 0.13 0.041 ( 0.100) 0.013 0.028 196 16.33 0.13 0.041 ( 0.100) 0.013 0.028 197 16.42 0.13 0.041 ( 0.099) 0.013 0.028 198 16.50 0.13 0.041 ( 0.099) 0.013 0.028 199 16.58 0.10 0.031 ( 0.098) 0.010 0.021 200 16.67 0.10 0.031 ( 0.098) 0.010 0.021 201 16.75 0.10 0.031 ( 0.097) 0.010 0.021 202 16.83 0.10 0.031 ( 0.097) 0.010 0.021 203 16.92 0.10 0.031 ( 0.096) 0.010 0.021 204 17.00 0.10 0.031 ( 0.096) 0.010 0.021 205 17.08 0.17 0.052 ( 0.095) 0.017 0.035 206 17.17 0.17 0.052 ( 0.095) 0.017 0.035 207 17.25 0.17 0.052 ( 0.094) 0.017 0.035 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 208 17.33 0.17 0.052 ( 0.094) 0.017 0.035 209 17.42 0.17 0.052 ( 0.093) 0.017 0.035 210 17.50 0.17 0.052 ( 0.093) 0.017 0.035 211 17.58 0.17 0.052 ( 0.092) 0.017 0.035 212 17.67 0.17 0.052 ( 0.092) 0.017 0.035 213 17.75 0.17 0.052 ( 0.091) 0.017 0.035 214 17.83 0.13 0.041 ( 0.091) 0.013 0.028 215 17.92 0.13 0.041 ( 0.090) 0.013 0.028 216 18.00 0.13 0.041 ( 0.090) 0.013 0.028 217 18.08 0.13 0.041 ( 0.090) 0.013 0.028 218 18.17 0.13 0.041 ( 0.089) 0.013 0.028 219 18.25 0.13 0.041 ( 0.089) 0.013 0.028 220 18.33 0.13 0.041 ( 0.088) 0.013 0.028 221 18.42 0.13 0.041 ( 0.088) 0.013 0.028 222 18.50 0.13 0.041 ( 0.087) 0.013 0.028 223 18.58 0.10 0.031 ( 0.087) 0.010 0.021 224 18.67 0.10 0.031 ( 0.087) 0.010 0.021 225 18.75 0.10 0.031 ( 0.086) 0.010 0.021 226 18.83 0.07 0.021 ( 0.086) 0.007 0.014 227 18.92 0.07 0.021 ( 0.085) 0.007 0.014 228 19.00 0.07 0.021 ( 0.085) 0.007 0.014 229 19.08 0.10 0.031 ( 0.085) 0.010 0.021 230 19.17 0.10 0.031 ( 0.084) 0.010 0.021 231 19.25 0.10 0.031 ( 0.084) 0.010 0.021 232 19.33 0.13 0.041 ( 0.083) 0.013 0.028 233 19.42 0.13 0.041 ( 0.083) 0.013 0.028 234 19.50 0.13 0.041 ( 0.083) 0.013 0.028 235 19.58 0.10 0.031 ( 0.082) 0.010 0.021 236 19.67 0.10 0.031 ( 0.082) 0.010 0.021 237 19.75 0.10 0.031 ( 0.081) 0.010 0.021 238 19.83 0.07 0.021 ( 0.081) 0.007 0.014 239 19.92 0.07 0.021 ( 0.081) 0.007 0.014 240 20.00 0.07 0.021 ( 0.080) 0.007 0.014 241 20.08 0.10 0.031 ( 0.080) 0.010 0.021 242 20.17 0.10 0.031 ( 0.080) 0.010 0.021 243 20.25 0.10 0.031 ( 0.079) 0.010 0.021 244 20.33 0.10 0.031 ( 0.079) 0.010 0.021 245 20.42 0.10 0.031 ( 0.079) 0.010 0.021 246 20.50 0.10 0.031 ( 0.078) 0.010 0.021 247 20.58 0.10 0.031 ( 0.078) 0.010 0.021 248 20.67 0.10 0.031 ( 0.078) 0.010 0.021 249 20.75 0.10 0.031 ( 0.077) 0.010 0.021 250 20.83 0.07 0.021 ( 0.077) 0.007 0.014 251 20.92 0.07 0.021 ( 0.077) 0.007 0.014 252 21.00 0.07 0.021 ( 0.076) 0.007 0.014 253 21.08 0.10 0.031 ( 0.076) 0.010 0.021 254 21.17 0.10 0.031 ( 0.076) 0.010 0.021 255 21.25 0.10 0.031 ( 0.076) 0.010 0.021 256 21.33 0.07 0.021 ( 0.075) 0.007 0.014 257 21.42 0.07 0.021 ( 0.075) 0.007 0.014 258 21.50 0.07 0.021 ( 0.075) 0.007 0.014 259 21.58 0.10 0.031 ( 0.074) 0.010 0.021 260 21.67 0.10 0.031 ( 0.074) 0.010 0.021 261 21.75 0.10 0.031 ( 0.074) 0.010 0.021 262 21.83 0.07 0.021 ( 0.074) 0.007 0.014 263 21.92 0.07 0.021 ( 0.073) 0.007 0.014 264 22.00 0.07 0.021 ( 0.073) 0.007 0.014 265 22.08 0.10 0.031 ( 0.073) 0.010 0.021 266 22.17 0.10 0.031 ( 0.073) 0.010 0.021 267 22.25 0.10 0.031 ( 0.072) 0.010 0.021 268 22.33 0.07 0.021 ( 0.072) 0.007 0.014 269 22.42 0.07 0.021 ( 0.072) 0.007 0.014 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 270 22.50 0.07 0.021 ( 0.072) 0.007 0.014 271 22.58 0.07 0.021 ( 0.072) 0.007 0.014 272 22.67 0.07 0.021 ( 0.071) 0.007 0.014 273 22.75 0.07 0.021 ( 0.071) 0.007 0.014 274 22.83 0.07 0.021 ( 0.071) 0.007 0.014 275 22.92 0.07 0.021 ( 0.071) 0.007 0.014 276 23.00 0.07 0.021 ( 0.071) 0.007 0.014 277 23.08 0.07 0.021 ( 0.070) 0.007 0.014 278 23.17 0.07 0.021 ( 0.070) 0.007 0.014 279 23.25 0.07 0.021 ( 0.070) 0.007 0.014 280 23.33 0.07 0.021 ( 0.070) 0.007 0.014 281 23.42 0.07 0.021 ( 0.070) 0.007 0.014 282 23.50 0.07 0.021 ( 0.070) 0.007 0.014 283 23.58 0.07 0.021 ( 0.070) 0.007 0.014 284 23.67 0.07 0.021 ( 0.069) 0.007 0.014 285 23.75 0.07 0.021 ( 0.069) 0.007 0.014 286 23.83 0.07 0.021 ( 0.069) 0.007 0.014 287 23.92 0.07 0.021 ( 0.069) 0.007 0.014 288 24.00 0.07 0.021 ( 0.069) 0.007 0.014 (Loss Rate Not Used)
Sum = 100.0 Sum = 21.1 Flood volume = Effective rainfall 1.76(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.83(In)
Total soil loss = 0.092(Ac.Ft)
Total rainfall = 2.59(In)
Flood volume = 8558.1 Cubic Feet
Total soil loss = 4027.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.323(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0002 0.02 Q | | | | 0+20 0.0003 0.02 Q | | | | 0+25 0.0005 0.02 Q | | | | 0+30 0.0007 0.03 Q | | | | 0+35 0.0009 0.03 Q | | | | 0+40 0.0011 0.03 Q | | | | 0+45 0.0012 0.03 Q | | | | 0+50 0.0014 0.03 Q | | | | 0+55 0.0017 0.03 Q | | | | 1+ 0 0.0019 0.04 Q | | | | 1+ 5 0.0022 0.04 Q | | | | 1+10 0.0024 0.03 Q | | | | 1+15 0.0026 0.03 Q | | | | 1+20 0.0028 0.03 Q | | | | 1+25 0.0030 0.03 Q | | | | 1+30 0.0032 0.03 Q | | | | 1+35 0.0034 0.03 Q | | | | 1+40 0.0036 0.03 Q | | | | 1+45 0.0038 0.03 Q | | | | 1+50 0.0040 0.03 Q | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 1+55 0.0042 0.03 Q | | | | 2+ 0 0.0045 0.04 Q | | | | 2+ 5 0.0047 0.04 Q | | | | 2+10 0.0050 0.04 QV | | | | 2+15 0.0053 0.04 QV | | | | 2+20 0.0055 0.04 QV | | | | 2+25 0.0058 0.04 QV | | | | 2+30 0.0060 0.04 QV | | | | 2+35 0.0063 0.04 QV | | | | 2+40 0.0066 0.04 QV | | | | 2+45 0.0069 0.05 QV | | | | 2+50 0.0073 0.05 QV | | | | 2+55 0.0076 0.05 QV | | | | 3+ 0 0.0079 0.05 QV | | | | 3+ 5 0.0082 0.05 QV | | | | 3+10 0.0086 0.05 QV | | | | 3+15 0.0089 0.05 QV | | | | 3+20 0.0092 0.05 QV | | | | 3+25 0.0095 0.05 QV | | | | 3+30 0.0099 0.05 Q V | | | | 3+35 0.0102 0.05 Q V | | | | 3+40 0.0105 0.05 Q V | | | | 3+45 0.0109 0.05 Q V | | | | 3+50 0.0112 0.05 Q V | | | | 3+55 0.0115 0.05 Q V | | | | 4+ 0 0.0119 0.06 Q V | | | | 4+ 5 0.0123 0.06 Q V | | | | 4+10 0.0127 0.06 Q V | | | | 4+15 0.0131 0.06 Q V | | | | 4+20 0.0135 0.06 Q V | | | | 4+25 0.0139 0.06 Q V | | | | 4+30 0.0144 0.06 Q V | | | | 4+35 0.0148 0.07 Q V | | | | 4+40 0.0153 0.07 Q V | | | | 4+45 0.0157 0.07 Q V | | | | 4+50 0.0162 0.07 Q V | | | | 4+55 0.0167 0.07 Q V | | | | 5+ 0 0.0172 0.07 Q V | | | | 5+ 5 0.0177 0.07 Q V | | | | 5+10 0.0182 0.06 Q V | | | | 5+15 0.0186 0.06 Q V | | | | 5+20 0.0190 0.06 Q V | | | | 5+25 0.0194 0.06 Q V | | | | 5+30 0.0199 0.07 Q V | | | | 5+35 0.0203 0.07 Q V | | | | 5+40 0.0208 0.07 Q V | | | | 5+45 0.0213 0.07 Q V | | | | 5+50 0.0219 0.08 Q V | | | | 5+55 0.0224 0.08 Q V | | | | 6+ 0 0.0229 0.08 Q V | | | | 6+ 5 0.0234 0.08 Q V | | | | 6+10 0.0240 0.08 Q V | | | | 6+15 0.0246 0.08 Q V | | | | 6+20 0.0252 0.08 Q V | | | | 6+25 0.0257 0.09 Q V | | | | 6+30 0.0263 0.09 Q V | | | | 6+35 0.0269 0.09 Q V | | | | 6+40 0.0276 0.09 Q V | | | | 6+45 0.0282 0.09 Q V | | | | 6+50 0.0288 0.09 Q V | | | | 6+55 0.0295 0.09 Q V | | | | 7+ 0 0.0302 0.09 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 7+ 5 0.0308 0.10 Q V | | | | 7+10 0.0315 0.10 Q V | | | | 7+15 0.0321 0.10 Q V | | | | 7+20 0.0328 0.10 Q V | | | | 7+25 0.0335 0.10 Q V | | | | 7+30 0.0342 0.10 Q V | | | | 7+35 0.0349 0.10 Q V | | | | 7+40 0.0357 0.11 Q V | | | | 7+45 0.0364 0.11 Q V | | | | 7+50 0.0372 0.11 Q V | | | | 7+55 0.0380 0.12 Q V | | | | 8+ 0 0.0389 0.12 Q V | | | | 8+ 5 0.0397 0.12 Q V | | | | 8+10 0.0407 0.13 Q V | | | | 8+15 0.0416 0.14 Q V | | | | 8+20 0.0426 0.14 Q V | | | | 8+25 0.0436 0.14 Q V | | | | 8+30 0.0445 0.14 Q V| | | | 8+35 0.0455 0.14 Q V| | | | 8+40 0.0465 0.15 Q V| | | | 8+45 0.0476 0.15 Q V| | | | 8+50 0.0486 0.15 Q V| | | | 8+55 0.0497 0.16 Q V | | | 9+ 0 0.0508 0.16 Q V | | | 9+ 5 0.0519 0.16 Q V | | | 9+10 0.0531 0.17 Q V | | | 9+15 0.0543 0.18 Q |V | | | 9+20 0.0556 0.18 Q |V | | | 9+25 0.0569 0.19 Q |V | | | 9+30 0.0582 0.19 Q |V | | | 9+35 0.0595 0.19 Q | V | | | 9+40 0.0608 0.20 Q | V | | | 9+45 0.0622 0.20 Q | V | | | 9+50 0.0635 0.20 Q | V | | | 9+55 0.0650 0.20 Q | V | | | 10+ 0 0.0664 0.21 Q | V | | | 10+ 5 0.0678 0.20 Q | V | | | 10+10 0.0689 0.17 Q | V | | | 10+15 0.0700 0.15 Q | V | | | 10+20 0.0710 0.15 Q | V | | | 10+25 0.0720 0.14 Q | V | | | 10+30 0.0730 0.14 Q | V | | | 10+35 0.0740 0.15 Q | V | | | 10+40 0.0752 0.17 Q | V | | | 10+45 0.0765 0.18 Q | V | | | 10+50 0.0777 0.19 Q | V | | | 10+55 0.0790 0.19 Q | V | | | 11+ 0 0.0803 0.19 Q | V | | | 11+ 5 0.0816 0.19 Q | V | | | 11+10 0.0829 0.18 Q | V | | | 11+15 0.0842 0.18 Q | V | | | 11+20 0.0854 0.18 Q | V | | | 11+25 0.0867 0.18 Q | V | | | 11+30 0.0879 0.18 Q | V | | | 11+35 0.0891 0.18 Q | V | | | 11+40 0.0903 0.17 Q | V | | | 11+45 0.0915 0.17 Q | V | | | 11+50 0.0926 0.16 Q | V | | | 11+55 0.0937 0.17 Q | V| | | 12+ 0 0.0949 0.17 Q | V| | | 12+ 5 0.0961 0.18 Q | V| | | 12+10 0.0976 0.21 Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+15 0.0991 0.23 Q | V | | 12+20 0.1007 0.23 Q | V | | 12+25 0.1024 0.24 Q | V | | 12+30 0.1041 0.24 Q | |V | | 12+35 0.1058 0.25 Q | |V | | 12+40 0.1075 0.26 |Q | |V | | 12+45 0.1094 0.26 |Q | | V | | 12+50 0.1112 0.27 |Q | | V | | 12+55 0.1130 0.27 |Q | | V | | 13+ 0 0.1149 0.27 |Q | | V | | 13+ 5 0.1169 0.28 |Q | | V | | 13+10 0.1189 0.30 |Q | | V | | 13+15 0.1211 0.31 |Q | | V | | 13+20 0.1233 0.32 |Q | | V | | 13+25 0.1255 0.32 |Q | | V | | 13+30 0.1277 0.32 |Q | | V | | 13+35 0.1299 0.31 |Q | | V | | 13+40 0.1317 0.26 |Q | | V | | 13+45 0.1333 0.24 Q | | V | | 13+50 0.1349 0.23 Q | | V | | 13+55 0.1364 0.22 Q | | V | | 14+ 0 0.1380 0.22 Q | | V | | 14+ 5 0.1395 0.22 Q | | V | | 14+10 0.1412 0.24 Q | | V | | 14+15 0.1429 0.25 Q | | V| | 14+20 0.1446 0.25 |Q | | V| | 14+25 0.1463 0.25 Q | | V| | 14+30 0.1481 0.25 Q | | V | 14+35 0.1498 0.25 Q | | V | 14+40 0.1515 0.25 Q | | V | 14+45 0.1532 0.25 Q | | |V | 14+50 0.1549 0.25 Q | | |V | 14+55 0.1565 0.24 Q | | |V | 15+ 0 0.1582 0.24 Q | | | V | 15+ 5 0.1598 0.24 Q | | | V | 15+10 0.1614 0.23 Q | | | V | 15+15 0.1630 0.23 Q | | | V | 15+20 0.1646 0.23 Q | | | V | 15+25 0.1661 0.22 Q | | | V | 15+30 0.1676 0.22 Q | | | V | 15+35 0.1691 0.22 Q | | | V | 15+40 0.1705 0.20 Q | | | V | 15+45 0.1718 0.19 Q | | | V | 15+50 0.1730 0.18 Q | | | V | 15+55 0.1743 0.18 Q | | | V | 16+ 0 0.1755 0.18 Q | | | V | 16+ 5 0.1767 0.17 Q | | | V | 16+10 0.1774 0.10 Q | | | V | 16+15 0.1778 0.06 Q | | | V | 16+20 0.1782 0.05 Q | | | V | 16+25 0.1785 0.04 Q | | | V | 16+30 0.1787 0.04 Q | | | V | 16+35 0.1790 0.04 Q | | | V | 16+40 0.1792 0.03 Q | | | V | 16+45 0.1794 0.03 Q | | | V | 16+50 0.1796 0.03 Q | | | V | 16+55 0.1798 0.03 Q | | | V | 17+ 0 0.1800 0.03 Q | | | V | 17+ 5 0.1802 0.03 Q | | | V | 17+10 0.1805 0.04 Q | | | V | 17+15 0.1808 0.04 Q | | | V | 17+20 0.1811 0.05 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 17+25 0.1815 0.05 Q | | | V | 17+30 0.1818 0.05 Q | | | V | 17+35 0.1821 0.05 Q | | | V | 17+40 0.1824 0.05 Q | | | V | 17+45 0.1828 0.05 Q | | | V | 17+50 0.1831 0.05 Q | | | V | 17+55 0.1834 0.04 Q | | | V | 18+ 0 0.1836 0.04 Q | | | V | 18+ 5 0.1839 0.04 Q | | | V | 18+10 0.1842 0.04 Q | | | V | 18+15 0.1844 0.04 Q | | | V | 18+20 0.1847 0.04 Q | | | V | 18+25 0.1850 0.04 Q | | | V | 18+30 0.1852 0.04 Q | | | V | 18+35 0.1855 0.04 Q | | | V | 18+40 0.1857 0.03 Q | | | V | 18+45 0.1859 0.03 Q | | | V | 18+50 0.1861 0.03 Q | | | V | 18+55 0.1863 0.02 Q | | | V | 19+ 0 0.1864 0.02 Q | | | V | 19+ 5 0.1866 0.02 Q | | | V | 19+10 0.1867 0.02 Q | | | V | 19+15 0.1869 0.03 Q | | | V | 19+20 0.1871 0.03 Q | | | V | 19+25 0.1873 0.03 Q | | | V | 19+30 0.1876 0.04 Q | | | V | 19+35 0.1878 0.04 Q | | | V | 19+40 0.1881 0.03 Q | | | V | 19+45 0.1883 0.03 Q | | | V | 19+50 0.1885 0.03 Q | | | V | 19+55 0.1886 0.02 Q | | | V | 20+ 0 0.1888 0.02 Q | | | V | 20+ 5 0.1889 0.02 Q | | | V | 20+10 0.1891 0.02 Q | | | V | 20+15 0.1893 0.03 Q | | | V | 20+20 0.1895 0.03 Q | | | V | 20+25 0.1897 0.03 Q | | | V | 20+30 0.1899 0.03 Q | | | V | 20+35 0.1901 0.03 Q | | | V | 20+40 0.1902 0.03 Q | | | V | 20+45 0.1904 0.03 Q | | | V | 20+50 0.1906 0.03 Q | | | V | 20+55 0.1908 0.02 Q | | | V | 21+ 0 0.1909 0.02 Q | | | V | 21+ 5 0.1911 0.02 Q | | | V | 21+10 0.1912 0.02 Q | | | V | 21+15 0.1914 0.03 Q | | | V | 21+20 0.1916 0.03 Q | | | V| 21+25 0.1918 0.02 Q | | | V| 21+30 0.1919 0.02 Q | | | V| 21+35 0.1921 0.02 Q | | | V| 21+40 0.1922 0.02 Q | | | V| 21+45 0.1924 0.03 Q | | | V| 21+50 0.1926 0.03 Q | | | V| 21+55 0.1928 0.02 Q | | | V| 22+ 0 0.1929 0.02 Q | | | V| 22+ 5 0.1930 0.02 Q | | | V| 22+10 0.1932 0.02 Q | | | V| 22+15 0.1934 0.03 Q | | | V| 22+20 0.1936 0.03 Q | | | V| 22+25 0.1937 0.02 Q | | | V| 22+30 0.1939 0.02 Q | | | V| PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22+35 0.1940 0.02 Q | | | V| 22+40 0.1942 0.02 Q | | | V| 22+45 0.1943 0.02 Q | | | V| 22+50 0.1944 0.02 Q | | | V| 22+55 0.1945 0.02 Q | | | V| 23+ 0 0.1947 0.02 Q | | | V| 23+ 5 0.1948 0.02 Q | | | V| 23+10 0.1949 0.02 Q | | | V| 23+15 0.1951 0.02 Q | | | V| 23+20 0.1952 0.02 Q | | | V| 23+25 0.1953 0.02 Q | | | V| 23+30 0.1955 0.02 Q | | | V| 23+35 0.1956 0.02 Q | | | V| 23+40 0.1957 0.02 Q | | | V| 23+45 0.1959 0.02 Q | | | V| 23+50 0.1960 0.02 Q | | | V| 23+55 0.1961 0.02 Q | | | V| 24+ 0 0.1963 0.02 Q | | | V| 24+ 5 0.1964 0.02 Q | | | V| 24+10 0.1964 0.01 Q | | | V| 24+15 0.1964 0.00 Q | | | V| 24+20 0.1965 0.00 Q | | | V| 24+25 0.1965 0.00 Q | | | V| 24+30 0.1965 0.00 Q | | | V| 24+35 0.1965 0.00 Q | | | V| 24+40 0.1965 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b1100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
100 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 0.50 0.67
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.10 1.47
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 1.100(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.100(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 74.8 0.305 0.810 0.083 1.000 0.083 Sum (F) = 0.083
Area averaged mean soil loss (F) (In/Hr) = 0.083
Minimum soil loss rate ((In/Hr)) = 0.041
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5500 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.30 0.436 0.083 ( 0.139) 0.353 2 0.17 4.20 0.554 0.083 ( 0.177) 0.472 3 0.25 4.40 0.581 0.083 ( 0.186) 0.498 4 0.33 4.80 0.634 0.083 ( 0.203) 0.551 5 0.42 5.20 0.686 0.083 ( 0.220) 0.604 6 0.50 6.20 0.818 0.083 ( 0.262) 0.736 7 0.58 6.80 0.898 0.083 ( 0.287) 0.815 8 0.67 8.80 1.162 0.083 ( 0.372) 1.079 9 0.75 13.90 1.835 0.083 ( 0.587) 1.752 10 0.83 31.40 4.145 0.083 ( 1.326) 4.062 11 0.92 7.20 0.950 0.083 ( 0.304) 0.868 12 1.00 3.80 0.502 0.083 ( 0.161) 0.419 (Loss Rate Not Used)
Sum = 100.0 Sum = 12.2 Flood volume = Effective rainfall 1.02(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.1(Ac.Ft) Total soil loss = 0.08(In)
Total soil loss = 0.009(Ac.Ft)
Total rainfall = 1.10(In)
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Flood volume = 4948.0 Cubic Feet
Total soil loss = 402.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 3.571(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0003 0.04 Q | | | | 0+10 0.0023 0.29 VQ | | | | 0+15 0.0056 0.49 |Q | | | | 0+20 0.0097 0.60 | QV | | | | 0+25 0.0144 0.68 | Q V | | | | 0+30 0.0198 0.77 | Q V | | | | 0+35 0.0260 0.90 | Q V| | | | 0+40 0.0332 1.04 | Q |V | | | 0+45 0.0425 1.35 | Q | V | | | 0+50 0.0575 2.18 | Q | V | | 0+55 0.0821 3.57 | | Q | V | | 1+ 0 0.0979 2.30 | Q| | | V | 1+ 5 0.1065 1.25 | Q | | | V | 1+10 0.1105 0.58 | Q | | | V | 1+15 0.1122 0.24 Q | | | V| 1+20 0.1129 0.11 Q | | | V| 1+25 0.1133 0.06 Q | | | V| 1+30 0.1135 0.03 Q | | | V| 1+35 0.1136 0.01 Q | | | V| 1+40 0.1136 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 10/07/24 File: rchph1b24100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH DMA B/A4
Kimley-Horn
100 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.34(Ac.) = 0.002 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.104 Hr.

Lag time = 6.24 Min.
25% of lag time = 1.56 Min.
40% of lag time = 2.50 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 1.60 2.14
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.34 4.00 5.36
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 4.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 4.000(In)
Sub-Area Data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.) Runoff Index Impervious %

1.340 56.00 0.810
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 74.8 0.305 0.810 0.083 1.000 0.083 Sum (F) = 0.083
Area averaged mean soil loss (F) (In/Hr) = 0.083
Minimum soil loss rate ((In/Hr)) = 0.041
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 80.128 9.037 0.122 2 0.167 160.256 48.467 0.655 3 0.250 240.385 24.442 0.330 4 0.333 320.513 9.714 0.131 5 0.417 400.641 4.868 0.066 6 0.500 480.769 1.848 0.025 7 0.583 560.897 0.741 0.010 8 0.667 641.026 0.548 0.007 9 0.750 721.154 0.334 0.005 Sum = 100.000 Sum= 1.350
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.032 ( 0.147) 0.010 0.022 2 0.17 0.07 0.032 ( 0.146) 0.010 0.022 3 0.25 0.07 0.032 ( 0.146) 0.010 0.022 4 0.33 0.10 0.048 ( 0.145) 0.015 0.033 5 0.42 0.10 0.048 ( 0.144) 0.015 0.033 6 0.50 0.10 0.048 ( 0.144) 0.015 0.033 7 0.58 0.10 0.048 ( 0.143) 0.015 0.033 8 0.67 0.10 0.048 ( 0.143) 0.015 0.033 9 0.75 0.10 0.048 ( 0.142) 0.015 0.033 10 0.83 0.13 0.064 ( 0.142) 0.020 0.044 11 0.92 0.13 0.064 ( 0.141) 0.020 0.044 12 1.00 0.13 0.064 ( 0.141) 0.020 0.044 13 1.08 0.10 0.048 ( 0.140) 0.015 0.033 14 1.17 0.10 0.048 ( 0.139) 0.015 0.033 15 1.25 0.10 0.048 ( 0.139) 0.015 0.033 16 1.33 0.10 0.048 ( 0.138) 0.015 0.033 17 1.42 0.10 0.048 ( 0.138) 0.015 0.033 18 1.50 0.10 0.048 ( 0.137) 0.015 0.033 19 1.58 0.10 0.048 ( 0.137) 0.015 0.033 20 1.67 0.10 0.048 ( 0.136) 0.015 0.033 21 1.75 0.10 0.048 ( 0.136) 0.015 0.033 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22 1.83 0.13 0.064 ( 0.135) 0.020 0.044 23 1.92 0.13 0.064 ( 0.134) 0.020 0.044 24 2.00 0.13 0.064 ( 0.134) 0.020 0.044 25 2.08 0.13 0.064 ( 0.133) 0.020 0.044 26 2.17 0.13 0.064 ( 0.133) 0.020 0.044 27 2.25 0.13 0.064 ( 0.132) 0.020 0.044 28 2.33 0.13 0.064 ( 0.132) 0.020 0.044 29 2.42 0.13 0.064 ( 0.131) 0.020 0.044 30 2.50 0.13 0.064 ( 0.131) 0.020 0.044 31 2.58 0.17 0.080 ( 0.130) 0.026 0.054 32 2.67 0.17 0.080 ( 0.130) 0.026 0.054 33 2.75 0.17 0.080 ( 0.129) 0.026 0.054 34 2.83 0.17 0.080 ( 0.129) 0.026 0.054 35 2.92 0.17 0.080 ( 0.128) 0.026 0.054 36 3.00 0.17 0.080 ( 0.128) 0.026 0.054 37 3.08 0.17 0.080 ( 0.127) 0.026 0.054 38 3.17 0.17 0.080 ( 0.126) 0.026 0.054 39 3.25 0.17 0.080 ( 0.126) 0.026 0.054 40 3.33 0.17 0.080 ( 0.125) 0.026 0.054 41 3.42 0.17 0.080 ( 0.125) 0.026 0.054 42 3.50 0.17 0.080 ( 0.124) 0.026 0.054 43 3.58 0.17 0.080 ( 0.124) 0.026 0.054 44 3.67 0.17 0.080 ( 0.123) 0.026 0.054 45 3.75 0.17 0.080 ( 0.123) 0.026 0.054 46 3.83 0.20 0.096 ( 0.122) 0.031 0.065 47 3.92 0.20 0.096 ( 0.122) 0.031 0.065 48 4.00 0.20 0.096 ( 0.121) 0.031 0.065 49 4.08 0.20 0.096 ( 0.121) 0.031 0.065 50 4.17 0.20 0.096 ( 0.120) 0.031 0.065 51 4.25 0.20 0.096 ( 0.120) 0.031 0.065 52 4.33 0.23 0.112 ( 0.119) 0.036 0.076 53 4.42 0.23 0.112 ( 0.119) 0.036 0.076 54 4.50 0.23 0.112 ( 0.118) 0.036 0.076 55 4.58 0.23 0.112 ( 0.118) 0.036 0.076 56 4.67 0.23 0.112 ( 0.117) 0.036 0.076 57 4.75 0.23 0.112 ( 0.117) 0.036 0.076 58 4.83 0.27 0.128 ( 0.116) 0.041 0.087 59 4.92 0.27 0.128 ( 0.116) 0.041 0.087 60 5.00 0.27 0.128 ( 0.115) 0.041 0.087 61 5.08 0.20 0.096 ( 0.115) 0.031 0.065 62 5.17 0.20 0.096 ( 0.114) 0.031 0.065 63 5.25 0.20 0.096 ( 0.114) 0.031 0.065 64 5.33 0.23 0.112 ( 0.113) 0.036 0.076 65 5.42 0.23 0.112 ( 0.113) 0.036 0.076 66 5.50 0.23 0.112 ( 0.112) 0.036 0.076 67 5.58 0.27 0.128 ( 0.112) 0.041 0.087 68 5.67 0.27 0.128 ( 0.111) 0.041 0.087 69 5.75 0.27 0.128 ( 0.111) 0.041 0.087 70 5.83 0.27 0.128 ( 0.110) 0.041 0.087 71 5.92 0.27 0.128 ( 0.110) 0.041 0.087 72 6.00 0.27 0.128 ( 0.109) 0.041 0.087 73 6.08 0.30 0.144 ( 0.109) 0.046 0.098 74 6.17 0.30 0.144 ( 0.108) 0.046 0.098 75 6.25 0.30 0.144 ( 0.108) 0.046 0.098 76 6.33 0.30 0.144 ( 0.107) 0.046 0.098 77 6.42 0.30 0.144 ( 0.107) 0.046 0.098 78 6.50 0.30 0.144 ( 0.106) 0.046 0.098 79 6.58 0.33 0.160 ( 0.106) 0.051 0.109 80 6.67 0.33 0.160 ( 0.105) 0.051 0.109 81 6.75 0.33 0.160 ( 0.105) 0.051 0.109 82 6.83 0.33 0.160 ( 0.104) 0.051 0.109 83 6.92 0.33 0.160 ( 0.104) 0.051 0.109 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 84 7.00 0.33 0.160 ( 0.103) 0.051 0.109 85 7.08 0.33 0.160 ( 0.103) 0.051 0.109 86 7.17 0.33 0.160 ( 0.103) 0.051 0.109 87 7.25 0.33 0.160 ( 0.102) 0.051 0.109 88 7.33 0.37 0.176 ( 0.102) 0.056 0.120 89 7.42 0.37 0.176 ( 0.101) 0.056 0.120 90 7.50 0.37 0.176 ( 0.101) 0.056 0.120 91 7.58 0.40 0.192 ( 0.100) 0.061 0.131 92 7.67 0.40 0.192 ( 0.100) 0.061 0.131 93 7.75 0.40 0.192 ( 0.099) 0.061 0.131 94 7.83 0.43 0.208 ( 0.099) 0.067 0.141 95 7.92 0.43 0.208 ( 0.098) 0.067 0.141 96 8.00 0.43 0.208 ( 0.098) 0.067 0.141 97 8.08 0.50 0.240 ( 0.097) 0.077 0.163 98 8.17 0.50 0.240 ( 0.097) 0.077 0.163 99 8.25 0.50 0.240 ( 0.097) 0.077 0.163 100 8.33 0.50 0.240 ( 0.096) 0.077 0.163 101 8.42 0.50 0.240 ( 0.096) 0.077 0.163 102 8.50 0.50 0.240 ( 0.095) 0.077 0.163 103 8.58 0.53 0.256 ( 0.095) 0.082 0.174 104 8.67 0.53 0.256 ( 0.094) 0.082 0.174 105 8.75 0.53 0.256 ( 0.094) 0.082 0.174 106 8.83 0.57 0.272 ( 0.093) 0.087 0.185 107 8.92 0.57 0.272 ( 0.093) 0.087 0.185 108 9.00 0.57 0.272 ( 0.093) 0.087 0.185 109 9.08 0.63 0.304 0.092 ( 0.097) 0.212 110 9.17 0.63 0.304 0.092 ( 0.097) 0.212 111 9.25 0.63 0.304 0.091 ( 0.097) 0.213 112 9.33 0.67 0.320 0.091 ( 0.102) 0.229 113 9.42 0.67 0.320 0.090 ( 0.102) 0.230 114 9.50 0.67 0.320 0.090 ( 0.102) 0.230 115 9.58 0.70 0.336 0.090 ( 0.108) 0.246 116 9.67 0.70 0.336 0.089 ( 0.108) 0.247 117 9.75 0.70 0.336 0.089 ( 0.108) 0.247 118 9.83 0.73 0.352 0.088 ( 0.113) 0.264 119 9.92 0.73 0.352 0.088 ( 0.113) 0.264 120 10.00 0.73 0.352 0.087 ( 0.113) 0.265 121 10.08 0.50 0.240 ( 0.087) 0.077 0.163 122 10.17 0.50 0.240 ( 0.087) 0.077 0.163 123 10.25 0.50 0.240 ( 0.086) 0.077 0.163 124 10.33 0.50 0.240 ( 0.086) 0.077 0.163 125 10.42 0.50 0.240 ( 0.085) 0.077 0.163 126 10.50 0.50 0.240 ( 0.085) 0.077 0.163 127 10.58 0.67 0.320 0.084 ( 0.102) 0.236 128 10.67 0.67 0.320 0.084 ( 0.102) 0.236 129 10.75 0.67 0.320 0.084 ( 0.102) 0.236 130 10.83 0.67 0.320 0.083 ( 0.102) 0.237 131 10.92 0.67 0.320 0.083 ( 0.102) 0.237 132 11.00 0.67 0.320 0.082 ( 0.102) 0.238 133 11.08 0.63 0.304 0.082 ( 0.097) 0.222 134 11.17 0.63 0.304 0.082 ( 0.097) 0.222 135 11.25 0.63 0.304 0.081 ( 0.097) 0.223 136 11.33 0.63 0.304 0.081 ( 0.097) 0.223 137 11.42 0.63 0.304 0.080 ( 0.097) 0.224 138 11.50 0.63 0.304 0.080 ( 0.097) 0.224 139 11.58 0.57 0.272 0.080 ( 0.087) 0.192 140 11.67 0.57 0.272 0.079 ( 0.087) 0.193 141 11.75 0.57 0.272 0.079 ( 0.087) 0.193 142 11.83 0.60 0.288 0.078 ( 0.092) 0.210 143 11.92 0.60 0.288 0.078 ( 0.092) 0.210 144 12.00 0.60 0.288 0.078 ( 0.092) 0.210 145 12.08 0.83 0.400 0.077 ( 0.128) 0.323 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 146 12.17 0.83 0.400 0.077 ( 0.128) 0.323 147 12.25 0.83 0.400 0.076 ( 0.128) 0.324 148 12.33 0.87 0.416 0.076 ( 0.133) 0.340 149 12.42 0.87 0.416 0.076 ( 0.133) 0.340 150 12.50 0.87 0.416 0.075 ( 0.133) 0.341 151 12.58 0.93 0.448 0.075 ( 0.143) 0.373 152 12.67 0.93 0.448 0.075 ( 0.143) 0.373 153 12.75 0.93 0.448 0.074 ( 0.143) 0.374 154 12.83 0.97 0.464 0.074 ( 0.148) 0.390 155 12.92 0.97 0.464 0.073 ( 0.148) 0.391 156 13.00 0.97 0.464 0.073 ( 0.148) 0.391 157 13.08 1.13 0.544 0.073 ( 0.174) 0.471 158 13.17 1.13 0.544 0.072 ( 0.174) 0.472 159 13.25 1.13 0.544 0.072 ( 0.174) 0.472 160 13.33 1.13 0.544 0.072 ( 0.174) 0.472 161 13.42 1.13 0.544 0.071 ( 0.174) 0.473 162 13.50 1.13 0.544 0.071 ( 0.174) 0.473 163 13.58 0.77 0.368 0.071 ( 0.118) 0.297 164 13.67 0.77 0.368 0.070 ( 0.118) 0.298 165 13.75 0.77 0.368 0.070 ( 0.118) 0.298 166 13.83 0.77 0.368 0.069 ( 0.118) 0.299 167 13.92 0.77 0.368 0.069 ( 0.118) 0.299 168 14.00 0.77 0.368 0.069 ( 0.118) 0.299 169 14.08 0.90 0.432 0.068 ( 0.138) 0.364 170 14.17 0.90 0.432 0.068 ( 0.138) 0.364 171 14.25 0.90 0.432 0.068 ( 0.138) 0.364 172 14.33 0.87 0.416 0.067 ( 0.133) 0.349 173 14.42 0.87 0.416 0.067 ( 0.133) 0.349 174 14.50 0.87 0.416 0.067 ( 0.133) 0.349 175 14.58 0.87 0.416 0.066 ( 0.133) 0.350 176 14.67 0.87 0.416 0.066 ( 0.133) 0.350 177 14.75 0.87 0.416 0.066 ( 0.133) 0.350 178 14.83 0.83 0.400 0.065 ( 0.128) 0.335 179 14.92 0.83 0.400 0.065 ( 0.128) 0.335 180 15.00 0.83 0.400 0.065 ( 0.128) 0.335 181 15.08 0.80 0.384 0.064 ( 0.123) 0.320 182 15.17 0.80 0.384 0.064 ( 0.123) 0.320 183 15.25 0.80 0.384 0.064 ( 0.123) 0.320 184 15.33 0.77 0.368 0.063 ( 0.118) 0.305 185 15.42 0.77 0.368 0.063 ( 0.118) 0.305 186 15.50 0.77 0.368 0.063 ( 0.118) 0.305 187 15.58 0.63 0.304 0.062 ( 0.097) 0.242 188 15.67 0.63 0.304 0.062 ( 0.097) 0.242 189 15.75 0.63 0.304 0.062 ( 0.097) 0.242 190 15.83 0.63 0.304 0.061 ( 0.097) 0.243 191 15.92 0.63 0.304 0.061 ( 0.097) 0.243 192 16.00 0.63 0.304 0.061 ( 0.097) 0.243 193 16.08 0.13 0.064 ( 0.060) 0.020 0.044 194 16.17 0.13 0.064 ( 0.060) 0.020 0.044 195 16.25 0.13 0.064 ( 0.060) 0.020 0.044 196 16.33 0.13 0.064 ( 0.060) 0.020 0.044 197 16.42 0.13 0.064 ( 0.059) 0.020 0.044 198 16.50 0.13 0.064 ( 0.059) 0.020 0.044 199 16.58 0.10 0.048 ( 0.059) 0.015 0.033 200 16.67 0.10 0.048 ( 0.058) 0.015 0.033 201 16.75 0.10 0.048 ( 0.058) 0.015 0.033 202 16.83 0.10 0.048 ( 0.058) 0.015 0.033 203 16.92 0.10 0.048 ( 0.057) 0.015 0.033 204 17.00 0.10 0.048 ( 0.057) 0.015 0.033 205 17.08 0.17 0.080 ( 0.057) 0.026 0.054 206 17.17 0.17 0.080 ( 0.057) 0.026 0.054 207 17.25 0.17 0.080 ( 0.056) 0.026 0.054 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 208 17.33 0.17 0.080 ( 0.056) 0.026 0.054 209 17.42 0.17 0.080 ( 0.056) 0.026 0.054 210 17.50 0.17 0.080 ( 0.055) 0.026 0.054 211 17.58 0.17 0.080 ( 0.055) 0.026 0.054 212 17.67 0.17 0.080 ( 0.055) 0.026 0.054 213 17.75 0.17 0.080 ( 0.055) 0.026 0.054 214 17.83 0.13 0.064 ( 0.054) 0.020 0.044 215 17.92 0.13 0.064 ( 0.054) 0.020 0.044 216 18.00 0.13 0.064 ( 0.054) 0.020 0.044 217 18.08 0.13 0.064 ( 0.054) 0.020 0.044 218 18.17 0.13 0.064 ( 0.053) 0.020 0.044 219 18.25 0.13 0.064 ( 0.053) 0.020 0.044 220 18.33 0.13 0.064 ( 0.053) 0.020 0.044 221 18.42 0.13 0.064 ( 0.053) 0.020 0.044 222 18.50 0.13 0.064 ( 0.052) 0.020 0.044 223 18.58 0.10 0.048 ( 0.052) 0.015 0.033 224 18.67 0.10 0.048 ( 0.052) 0.015 0.033 225 18.75 0.10 0.048 ( 0.052) 0.015 0.033 226 18.83 0.07 0.032 ( 0.051) 0.010 0.022 227 18.92 0.07 0.032 ( 0.051) 0.010 0.022 228 19.00 0.07 0.032 ( 0.051) 0.010 0.022 229 19.08 0.10 0.048 ( 0.051) 0.015 0.033 230 19.17 0.10 0.048 ( 0.050) 0.015 0.033 231 19.25 0.10 0.048 ( 0.050) 0.015 0.033 232 19.33 0.13 0.064 ( 0.050) 0.020 0.044 233 19.42 0.13 0.064 ( 0.050) 0.020 0.044 234 19.50 0.13 0.064 ( 0.049) 0.020 0.044 235 19.58 0.10 0.048 ( 0.049) 0.015 0.033 236 19.67 0.10 0.048 ( 0.049) 0.015 0.033 237 19.75 0.10 0.048 ( 0.049) 0.015 0.033 238 19.83 0.07 0.032 ( 0.048) 0.010 0.022 239 19.92 0.07 0.032 ( 0.048) 0.010 0.022 240 20.00 0.07 0.032 ( 0.048) 0.010 0.022 241 20.08 0.10 0.048 ( 0.048) 0.015 0.033 242 20.17 0.10 0.048 ( 0.048) 0.015 0.033 243 20.25 0.10 0.048 ( 0.047) 0.015 0.033 244 20.33 0.10 0.048 ( 0.047) 0.015 0.033 245 20.42 0.10 0.048 ( 0.047) 0.015 0.033 246 20.50 0.10 0.048 ( 0.047) 0.015 0.033 247 20.58 0.10 0.048 ( 0.047) 0.015 0.033 248 20.67 0.10 0.048 ( 0.046) 0.015 0.033 249 20.75 0.10 0.048 ( 0.046) 0.015 0.033 250 20.83 0.07 0.032 ( 0.046) 0.010 0.022 251 20.92 0.07 0.032 ( 0.046) 0.010 0.022 252 21.00 0.07 0.032 ( 0.046) 0.010 0.022 253 21.08 0.10 0.048 ( 0.045) 0.015 0.033 254 21.17 0.10 0.048 ( 0.045) 0.015 0.033 255 21.25 0.10 0.048 ( 0.045) 0.015 0.033 256 21.33 0.07 0.032 ( 0.045) 0.010 0.022 257 21.42 0.07 0.032 ( 0.045) 0.010 0.022 258 21.50 0.07 0.032 ( 0.045) 0.010 0.022 259 21.58 0.10 0.048 ( 0.044) 0.015 0.033 260 21.67 0.10 0.048 ( 0.044) 0.015 0.033 261 21.75 0.10 0.048 ( 0.044) 0.015 0.033 262 21.83 0.07 0.032 ( 0.044) 0.010 0.022 263 21.92 0.07 0.032 ( 0.044) 0.010 0.022 264 22.00 0.07 0.032 ( 0.044) 0.010 0.022 265 22.08 0.10 0.048 ( 0.044) 0.015 0.033 266 22.17 0.10 0.048 ( 0.043) 0.015 0.033 267 22.25 0.10 0.048 ( 0.043) 0.015 0.033 268 22.33 0.07 0.032 ( 0.043) 0.010 0.022 269 22.42 0.07 0.032 ( 0.043) 0.010 0.022 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 270 22.50 0.07 0.032 ( 0.043) 0.010 0.022 271 22.58 0.07 0.032 ( 0.043) 0.010 0.022 272 22.67 0.07 0.032 ( 0.043) 0.010 0.022 273 22.75 0.07 0.032 ( 0.043) 0.010 0.022 274 22.83 0.07 0.032 ( 0.042) 0.010 0.022 275 22.92 0.07 0.032 ( 0.042) 0.010 0.022 276 23.00 0.07 0.032 ( 0.042) 0.010 0.022 277 23.08 0.07 0.032 ( 0.042) 0.010 0.022 278 23.17 0.07 0.032 ( 0.042) 0.010 0.022 279 23.25 0.07 0.032 ( 0.042) 0.010 0.022 280 23.33 0.07 0.032 ( 0.042) 0.010 0.022 281 23.42 0.07 0.032 ( 0.042) 0.010 0.022 282 23.50 0.07 0.032 ( 0.042) 0.010 0.022 283 23.58 0.07 0.032 ( 0.042) 0.010 0.022 284 23.67 0.07 0.032 ( 0.042) 0.010 0.022 285 23.75 0.07 0.032 ( 0.041) 0.010 0.022 286 23.83 0.07 0.032 ( 0.041) 0.010 0.022 287 23.92 0.07 0.032 ( 0.041) 0.010 0.022 288 24.00 0.07 0.032 ( 0.041) 0.010 0.022 (Loss Rate Not Used)
Sum = 100.0 Sum = 36.1 Flood volume = Effective rainfall 3.01(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.3(Ac.Ft) Total soil loss = 0.99(In)
Total soil loss = 0.111(Ac.Ft)
Total rainfall = 4.00(In)
Flood volume = 14639.0 Cubic Feet
Total soil loss = 4817.8 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.637(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.02 Q | | | | 0+15 0.0003 0.02 Q | | | | 0+20 0.0005 0.03 Q | | | | 0+25 0.0007 0.04 Q | | | | 0+30 0.0010 0.04 Q | | | | 0+35 0.0013 0.04 Q | | | | 0+40 0.0016 0.04 Q | | | | 0+45 0.0019 0.04 Q | | | | 0+50 0.0022 0.05 Q | | | | 0+55 0.0026 0.05 Q | | | | 1+ 0 0.0030 0.06 Q | | | | 1+ 5 0.0034 0.06 Q | | | | 1+10 0.0037 0.05 Q | | | | 1+15 0.0040 0.05 Q | | | | 1+20 0.0043 0.05 Q | | | | 1+25 0.0047 0.04 Q | | | | 1+30 0.0050 0.04 Q | | | | 1+35 0.0053 0.04 Q | | | | 1+40 0.0056 0.04 Q | | | | 1+45 0.0059 0.04 Q | | | | 1+50 0.0062 0.05 Q | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 1+55 0.0065 0.05 Q | | | | 2+ 0 0.0069 0.06 Q | | | | 2+ 5 0.0073 0.06 Q | | | | 2+10 0.0077 0.06 Q | | | | 2+15 0.0081 0.06 Q | | | | 2+20 0.0085 0.06 QV | | | | 2+25 0.0089 0.06 QV | | | | 2+30 0.0094 0.06 QV | | | | 2+35 0.0098 0.06 QV | | | | 2+40 0.0102 0.07 QV | | | | 2+45 0.0107 0.07 QV | | | | 2+50 0.0112 0.07 QV | | | | 2+55 0.0117 0.07 QV | | | | 3+ 0 0.0122 0.07 QV | | | | 3+ 5 0.0127 0.07 QV | | | | 3+10 0.0132 0.07 QV | | | | 3+15 0.0137 0.07 QV | | | | 3+20 0.0142 0.07 QV | | | | 3+25 0.0148 0.07 QV | | | | 3+30 0.0153 0.07 QV | | | | 3+35 0.0158 0.07 QV | | | | 3+40 0.0163 0.07 QV | | | | 3+45 0.0168 0.07 QV | | | | 3+50 0.0173 0.07 Q V | | | | 3+55 0.0179 0.08 Q V | | | | 4+ 0 0.0184 0.09 Q V | | | | 4+ 5 0.0190 0.09 Q V | | | | 4+10 0.0196 0.09 Q V | | | | 4+15 0.0203 0.09 Q V | | | | 4+20 0.0209 0.09 Q V | | | | 4+25 0.0215 0.10 Q V | | | | 4+30 0.0222 0.10 Q V | | | | 4+35 0.0229 0.10 Q V | | | | 4+40 0.0236 0.10 Q V | | | | 4+45 0.0243 0.10 Q V | | | | 4+50 0.0251 0.10 Q V | | | | 4+55 0.0258 0.11 Q V | | | | 5+ 0 0.0266 0.11 Q V | | | | 5+ 5 0.0274 0.11 Q V | | | | 5+10 0.0281 0.10 Q V | | | | 5+15 0.0287 0.09 Q V | | | | 5+20 0.0294 0.09 Q V | | | | 5+25 0.0300 0.10 Q V | | | | 5+30 0.0307 0.10 Q V | | | | 5+35 0.0314 0.10 Q V | | | | 5+40 0.0322 0.11 Q V | | | | 5+45 0.0330 0.11 Q V | | | | 5+50 0.0338 0.12 Q V | | | | 5+55 0.0346 0.12 Q V | | | | 6+ 0 0.0354 0.12 Q V | | | | 6+ 5 0.0362 0.12 Q V | | | | 6+10 0.0371 0.13 Q V | | | | 6+15 0.0380 0.13 Q V | | | | 6+20 0.0389 0.13 Q V | | | | 6+25 0.0398 0.13 Q V | | | | 6+30 0.0407 0.13 Q V | | | | 6+35 0.0416 0.13 Q V | | | | 6+40 0.0426 0.14 Q V | | | | 6+45 0.0436 0.14 Q V | | | | 6+50 0.0446 0.15 Q V | | | | 6+55 0.0456 0.15 Q V | | | | 7+ 0 0.0466 0.15 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 7+ 5 0.0476 0.15 Q V | | | | 7+10 0.0486 0.15 Q V | | | | 7+15 0.0496 0.15 Q V | | | | 7+20 0.0507 0.15 Q V | | | | 7+25 0.0517 0.16 Q V | | | | 7+30 0.0528 0.16 Q V | | | | 7+35 0.0540 0.16 Q V | | | | 7+40 0.0551 0.17 Q V | | | | 7+45 0.0563 0.17 Q V | | | | 7+50 0.0575 0.18 Q V | | | | 7+55 0.0588 0.18 Q V | | | | 8+ 0 0.0601 0.19 Q V | | | | 8+ 5 0.0614 0.19 Q V | | | | 8+10 0.0628 0.21 Q V | | | | 8+15 0.0643 0.21 Q V | | | | 8+20 0.0658 0.22 Q V | | | | 8+25 0.0673 0.22 Q V | | | | 8+30 0.0689 0.22 Q V | | | | 8+35 0.0704 0.22 Q V | | | | 8+40 0.0720 0.23 Q V | | | | 8+45 0.0736 0.23 Q V | | | | 8+50 0.0752 0.24 Q V | | | | 8+55 0.0769 0.24 Q V| | | | 9+ 0 0.0786 0.25 Q V| | | | 9+ 5 0.0803 0.25 |Q V| | | | 9+10 0.0822 0.27 |Q V| | | | 9+15 0.0841 0.28 |Q V | | | 9+20 0.0860 0.29 |Q V | | | 9+25 0.0881 0.30 |Q V | | | 9+30 0.0902 0.31 |Q V | | | 9+35 0.0923 0.31 |Q V | | | 9+40 0.0946 0.32 |Q |V | | | 9+45 0.0968 0.33 |Q |V | | | 9+50 0.0991 0.33 |Q |V | | | 9+55 0.1015 0.35 |Q | V | | | 10+ 0 0.1039 0.35 |Q | V | | | 10+ 5 0.1063 0.34 |Q | V | | | 10+10 0.1082 0.28 |Q | V | | | 10+15 0.1099 0.24 Q | V | | | 10+20 0.1115 0.23 Q | V | | | 10+25 0.1130 0.23 Q | V | | | 10+30 0.1146 0.22 Q | V | | | 10+35 0.1162 0.23 Q | V | | | 10+40 0.1181 0.28 |Q | V | | | 10+45 0.1202 0.30 |Q | V | | | 10+50 0.1223 0.31 |Q | V | | | 10+55 0.1245 0.32 |Q | V | | | 11+ 0 0.1267 0.32 |Q | V | | | 11+ 5 0.1289 0.32 |Q | V | | | 11+10 0.1310 0.31 |Q | V | | | 11+15 0.1331 0.30 |Q | V | | | 11+20 0.1352 0.30 |Q | V | | | 11+25 0.1372 0.30 |Q | V | | | 11+30 0.1393 0.30 |Q | V | | | 11+35 0.1414 0.30 |Q | V | | | 11+40 0.1433 0.28 |Q | V | | | 11+45 0.1451 0.27 |Q | V | | | 11+50 0.1470 0.27 |Q | V | | | 11+55 0.1489 0.28 |Q | V | | | 12+ 0 0.1508 0.28 |Q | V | | | 12+ 5 0.1528 0.30 |Q | V | | | 12+10 0.1554 0.37 |Q | V | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+15 0.1582 0.41 |Q | V | | | 12+20 0.1611 0.43 |Q | V| | | 12+25 0.1642 0.44 |Q | V| | | 12+30 0.1673 0.45 |Q | V| | | 12+35 0.1705 0.46 |Q | V | | 12+40 0.1738 0.48 |Q | V | | 12+45 0.1772 0.50 |Q | |V | | 12+50 0.1807 0.50 | Q | |V | | 12+55 0.1843 0.52 | Q | |V | | 13+ 0 0.1879 0.52 | Q | | V | | 13+ 5 0.1915 0.54 | Q | | V | | 13+10 0.1956 0.59 | Q | | V | | 13+15 0.1999 0.62 | Q | | V | | 13+20 0.2042 0.63 | Q | | V | | 13+25 0.2085 0.63 | Q | | V | | 13+30 0.2129 0.64 | Q | | V | | 13+35 0.2172 0.62 | Q | | V | | 13+40 0.2206 0.50 | Q | | V | | 13+45 0.2237 0.45 |Q | | V | | 13+50 0.2266 0.42 |Q | | V | | 13+55 0.2294 0.41 |Q | | V | | 14+ 0 0.2323 0.41 |Q | | V | | 14+ 5 0.2351 0.41 |Q | | V | | 14+10 0.2382 0.46 |Q | | V | | 14+15 0.2415 0.48 |Q | | V | | 14+20 0.2448 0.48 |Q | | V| | 14+25 0.2481 0.48 |Q | | V| | 14+30 0.2514 0.47 |Q | | V| | 14+35 0.2546 0.47 |Q | | V | 14+40 0.2579 0.47 |Q | | V | 14+45 0.2612 0.47 |Q | | |V | 14+50 0.2644 0.47 |Q | | |V | 14+55 0.2676 0.46 |Q | | |V | 15+ 0 0.2707 0.46 |Q | | | V | 15+ 5 0.2738 0.45 |Q | | | V | 15+10 0.2769 0.44 |Q | | | V | 15+15 0.2799 0.44 |Q | | | V | 15+20 0.2829 0.43 |Q | | | V | 15+25 0.2858 0.42 |Q | | | V | 15+30 0.2886 0.42 |Q | | | V | 15+35 0.2914 0.41 |Q | | | V | 15+40 0.2939 0.36 |Q | | | V | 15+45 0.2963 0.34 |Q | | | V | 15+50 0.2986 0.33 |Q | | | V | 15+55 0.3009 0.33 |Q | | | V | 16+ 0 0.3031 0.33 |Q | | | V | 16+ 5 0.3052 0.30 |Q | | | V | 16+10 0.3064 0.17 Q | | | V | 16+15 0.3072 0.11 Q | | | V | 16+20 0.3077 0.08 Q | | | V | 16+25 0.3082 0.07 Q | | | V | 16+30 0.3086 0.06 Q | | | V | 16+35 0.3091 0.06 Q | | | V | 16+40 0.3094 0.05 Q | | | V | 16+45 0.3097 0.05 Q | | | V | 16+50 0.3100 0.05 Q | | | V | 16+55 0.3103 0.04 Q | | | V | 17+ 0 0.3107 0.04 Q | | | V | 17+ 5 0.3110 0.05 Q | | | V | 17+10 0.3114 0.06 Q | | | V | 17+15 0.3119 0.07 Q | | | V | 17+20 0.3124 0.07 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 17+25 0.3129 0.07 Q | | | V | 17+30 0.3134 0.07 Q | | | V | 17+35 0.3139 0.07 Q | | | V | 17+40 0.3144 0.07 Q | | | V | 17+45 0.3149 0.07 Q | | | V | 17+50 0.3154 0.07 Q | | | V | 17+55 0.3158 0.07 Q | | | V | 18+ 0 0.3162 0.06 Q | | | V | 18+ 5 0.3167 0.06 Q | | | V | 18+10 0.3171 0.06 Q | | | V | 18+15 0.3175 0.06 Q | | | V | 18+20 0.3179 0.06 Q | | | V | 18+25 0.3183 0.06 Q | | | V | 18+30 0.3187 0.06 Q | | | V | 18+35 0.3191 0.06 Q | | | V | 18+40 0.3194 0.05 Q | | | V | 18+45 0.3198 0.05 Q | | | V | 18+50 0.3201 0.04 Q | | | V | 18+55 0.3203 0.04 Q | | | V | 19+ 0 0.3205 0.03 Q | | | V | 19+ 5 0.3207 0.03 Q | | | V | 19+10 0.3210 0.04 Q | | | V | 19+15 0.3213 0.04 Q | | | V | 19+20 0.3216 0.04 Q | | | V | 19+25 0.3220 0.05 Q | | | V | 19+30 0.3223 0.06 Q | | | V | 19+35 0.3227 0.06 Q | | | V | 19+40 0.3231 0.05 Q | | | V | 19+45 0.3234 0.05 Q | | | V | 19+50 0.3237 0.04 Q | | | V | 19+55 0.3239 0.04 Q | | | V | 20+ 0 0.3242 0.03 Q | | | V | 20+ 5 0.3244 0.03 Q | | | V | 20+10 0.3247 0.04 Q | | | V | 20+15 0.3249 0.04 Q | | | V | 20+20 0.3252 0.04 Q | | | V | 20+25 0.3255 0.04 Q | | | V | 20+30 0.3258 0.04 Q | | | V | 20+35 0.3261 0.04 Q | | | V | 20+40 0.3264 0.04 Q | | | V | 20+45 0.3268 0.04 Q | | | V | 20+50 0.3270 0.04 Q | | | V | 20+55 0.3273 0.04 Q | | | V | 21+ 0 0.3275 0.03 Q | | | V | 21+ 5 0.3277 0.03 Q | | | V| 21+10 0.3280 0.04 Q | | | V| 21+15 0.3283 0.04 Q | | | V| 21+20 0.3286 0.04 Q | | | V| 21+25 0.3288 0.04 Q | | | V| 21+30 0.3290 0.03 Q | | | V| 21+35 0.3293 0.03 Q | | | V| 21+40 0.3295 0.04 Q | | | V| 21+45 0.3298 0.04 Q | | | V| 21+50 0.3301 0.04 Q | | | V| 21+55 0.3303 0.04 Q | | | V| 22+ 0 0.3306 0.03 Q | | | V| 22+ 5 0.3308 0.03 Q | | | V| 22+10 0.3310 0.04 Q | | | V| 22+15 0.3313 0.04 Q | | | V| 22+20 0.3316 0.04 Q | | | V| 22+25 0.3319 0.04 Q | | | V| 22+30 0.3321 0.03 Q | | | V| PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 22+35 0.3323 0.03 Q | | | V| 22+40 0.3325 0.03 Q | | | V| 22+45 0.3327 0.03 Q | | | V| 22+50 0.3329 0.03 Q | | | V| 22+55 0.3331 0.03 Q | | | V| 23+ 0 0.3333 0.03 Q | | | V| 23+ 5 0.3335 0.03 Q | | | V| 23+10 0.3337 0.03 Q | | | V| 23+15 0.3339 0.03 Q | | | V| 23+20 0.3341 0.03 Q | | | V| 23+25 0.3343 0.03 Q | | | V| 23+30 0.3345 0.03 Q | | | V| 23+35 0.3347 0.03 Q | | | V| 23+40 0.3349 0.03 Q | | | V| 23+45 0.3351 0.03 Q | | | V| 23+50 0.3353 0.03 Q | | | V| 23+55 0.3355 0.03 Q | | | V| 24+ 0 0.3357 0.03 Q | | | V| 24+ 5 0.3359 0.03 Q | | | V| 24+10 0.3360 0.01 Q | | | V| 24+15 0.3360 0.01 Q | | | V| 24+20 0.3361 0.00 Q | | | V| 24+25 0.3361 0.00 Q | | | V| 24+30 0.3361 0.00 Q | | | V| 24+35 0.3361 0.00 Q | | | V| 24+40 0.3361 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 21 Riverside Community Hospital Phase 1 │ Preliminary Hydrology Report January 2025

Appendix I - Basin Routing Analysis

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Detention Basin Infiltration Calculation
Project Name: RCH Garage Expansion
Completed by: BY
Reviewed by: LAC
Date: 24-Jan-24
Updated: 15-Oct-24
County: Riverside
BMP Measured Infiltration
Rate
Design Factor of
Safety Design Infiltration Rate Detention Basin
Infiltration Area
In/Hr to Ft/Sec
Conversion Value
Constant Infiltration
Rate
(in/hr) (in/hr) (sf) (cf/sec)
BMP 1 2.775 2.00 1.39 1647 43200 0.053
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Drawdown Calculations
Project Name: RCH Garage Expansion
Completed by: BY
Reviewed by: LAC
Date: 24-Jan-24
Updated: 15-Oct-24
County: San Bernardino
BMP
Design
Infiltration
Rate
Design
Infiltration Rate
Converted
Detention Basin
Infiltration Area
Volume to
Infiltrate Drawdown Time
(in/hr) (ft/hr) (sf) (cf) (hrs)
BMP 1 1.388 0.116 1647 2745 14.415
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Date: 10/7/2024
Project Name: BMP 1 - 55739 (10-7-2024 22-50-45)
City / County:

State:

Designed By:

Company:
=Adjustable Input Cells Telephone:

Out-to-out length (ft): 61.0 Backfill Porosity (%): 40% System Diameter (in): 84 Out-to-out width (ft): 27.0 Depth Above Pipe (in): 12.0 Pipe Spacing (in): 36 Number of Manifolds (ea): 1.0 Depth Below Pipe (in): 12.0 Incremental Analysis (in): 2 Number of Barrels (ea): 3.0 Width At Ends (ft): 1.0 System Invert (Elevation): 0 Width At Sides (ft): 1.0
Depth (ft) Elevation (ft)
Incremental
Storage (cf)
Cumulative
Storage (cf)
Incremental
Storage (cf)
Cumulative
Storage (cf)
Incremental
Storage (cf)
Cumulative
Storage (cf)
Percent Open
Storage (%)
Ave. Surface
Area (sf)

0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.0% 730.8

0.17 0.16 0.0 0.0 121.8 121.8 121.8 121.8 0.0% 730.8

0.33 0.33 0.0 0.0 121.8 243.6 121.8 243.6 0.0% 730.8

0.50 0.50 0.0 0.0 121.8 365.4 121.8 365.4 0.0% 730.8

0.67 0.66 0.0 0.0 121.8 487.2 121.8 487.2 0.0% 730.8

0.83 0.83 0.0 0.0 121.8 609.0 121.8 609.0 0.0% 730.8

1.00 1.00 0.0 0.0 121.8 730.8 121.8 730.8 0.0% 730.8

1.17 1.16 45.0 45.0 103.8 834.6 148.8 879.6 5.1% 972.8

1.33 1.33 81.4 126.5 89.2 923.8 170.7 1,050.3 12.0% 1,068.9

1.50 1.50 104.1 230.6 80.1 1,004.0 184.3 1,234.6 18.7% 1,139.7

1.67 1.66 121.8 352.4 73.1 1,077.1 194.9 1,429.4 24.7% 1,196.8

1.83 1.83 136.3 488.7 67.3 1,144.3 203.6 1,633.0 29.9% 1,244.9

2.00 2.00 148.7 637.4 62.3 1,206.6 211.0 1,844.0 34.6% 1,286.3

2.17 2.16 159.4 796.8 58.0 1,264.7 217.5 2,061.5 38.7% 1,322.5

2.33 2.33 168.9 965.7 54.3 1,318.9 223.1 2,284.6 42.3% 1,354.2

2.50 2.50 177.1 1,142.8 50.9 1,369.9 228.1 2,512.7 45.5% 1,382.2

2.67 2.66 184.5 1,327.3 48.0 1,417.9 232.5 2,745.2 48.3% 1,407.0

2.83 2.83 190.9 1,518.2 45.4 1,463.3 236.4 2,981.5 50.9% 1,428.8

3.00 3.00 196.6 1,714.8 43.2 1,506.5 239.8 3,221.3 53.2% 1,448.0

3.17 3.16 201.6 1,916.4 41.2 1,547.6 242.8 3,464.1 55.3% 1,464.7

3.33 3.33 205.9 2,122.4 39.4 1,587.1 245.4 3,709.4 57.2% 1,479.2

3.50 3.50 209.6 2,332.0 37.9 1,625.0 247.6 3,957.0 58.9% 1,491.5

3.67 3.66 212.8 2,544.8 36.7 1,661.7 249.5 4,206.5 60.5% 1,501.8

3.83 3.83 215.4 2,760.1 35.7 1,697.3 251.0 4,457.5 61.9% 1,510.1

4.00 4.00 217.4 2,977.5 34.8 1,732.2 252.2 4,709.7 63.2% 1,516.5

4.17 4.16 218.9 3,196.5 34.2 1,766.4 253.1 4,962.9 64.4% 1,521.0

4.33 4.33 219.9 3,416.4 33.8 1,800.3 253.7 5,216.6 65.5% 1,523.7

4.50 4.50 220.4 3,636.8 33.6 1,833.9 254.0 5,470.7 66.5% 1,524.6

4.67 4.66 220.4 3,857.2 33.6 1,867.5 254.0 5,724.7 67.4% 1,523.7

4.83 4.83 219.9 4,077.1 33.8 1,901.4 253.7 5,978.5 68.2% 1,521.0

5.00 5.00 218.9 4,296.0 34.2 1,935.6 253.1 6,231.6 68.9% 1,516.5

5.17 5.16 217.4 4,513.4 34.8 1,970.4 252.2 6,483.9 69.6% 1,510.1

5.33 5.33 215.4 4,728.8 35.7 2,006.1 251.0 6,734.9 70.2% 1,501.8

5.50 5.50 212.8 4,941.6 36.7 2,042.8 249.5 6,984.3 70.8% 1,491.5

5.67 5.66 209.6 5,151.2 37.9 2,080.7 247.6 7,231.9 71.2% 1,479.2

5.83 5.83 205.9 5,357.1 39.4 2,120.1 245.4 7,477.3 71.6% 1,464.7

6.00 6.00 201.6 5,558.7 41.2 2,161.3 242.8 7,720.0 72.0% 1,448.0 Pipe Stone Total SystemSystem
Storage Volume Estimation
Miscellaneous
Contech Engineered Solutions, LLC is pleased to offer the following estimate of storage volume for the above named project. The results are submitted as an estimate only, without liability on the part of Contech Engineered Solutions, LLC for accuracy or suitability to any particular applicaton and are subject to verification of the Engineer of Record. This tool is only applicable for rectangular shaped systems.

CMP: Underground Detention System
Storage Volume Estimation
Summary of Inputs
Pipe & Analysis InformationSystem Information Backfill Information These results are submitted to you as a guideline only, without liability on the part of CONTECH Engineered Solutions, LLC for accuracy or suitability to any particular application, and are subject to your verification.

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

6.17 6.16 196.6 5,755.4 43.2 2,204.5 239.8 7,959.8 72.3% 1,428.8

6.33 6.33 190.9 5,946.3 45.4 2,249.9 236.4 8,196.2 72.5% 1,407.0

6.50 6.50 184.5 6,130.7 48.0 2,297.9 232.5 8,428.6 72.7% 1,382.2

6.67 6.66 177.1 6,307.9 50.9 2,348.8 228.1 8,656.7 72.9% 1,354.2

6.83 6.83 168.9 6,476.7 54.3 2,403.1 223.1 8,879.8 72.9% 1,322.5

7.00 7.00 159.4 6,636.2 58.0 2,461.1 217.5 9,097.3 72.9% 1,286.3

7.17 7.16 148.7 6,784.9 62.3 2,523.4 211.0 9,308.3 72.9% 1,244.9

7.33 7.33 136.3 6,921.2 67.3 2,590.7 203.6 9,511.9 72.8% 1,196.8

7.50 7.50 121.8 7,043.0 73.1 2,663.8 194.9 9,706.8 72.6% 1,139.7

7.67 7.66 104.1 7,147.1 80.1 2,744.0 184.3 9,891.1 72.3% 1,068.9

7.83 7.83 81.4 7,228.5 89.2 2,833.2 170.7 10,061.7 71.8% 972.8

8.00 8.00 45.0 7,273.6 103.8 2,937.0 148.8 10,210.5 71.2% 730.8

8.17 8.16 0.0 7,273.6 121.8 3,058.8 121.8 10,332.3 70.4% 730.8

8.33 8.33 0.0 7,273.6 121.8 3,180.6 121.8 10,454.1 69.6% 730.8

8.50 8.50 0.0 7,273.6 121.8 3,302.4 121.8 10,575.9 68.8% 730.8

8.67 8.66 0.0 7,273.6 121.8 3,424.2 121.8 10,697.7 68.0% 730.8

8.83 8.83 0.0 7,273.6 121.8 3,546.0 121.8 10,819.5 67.2% 730.8

9.00 9.00 0.0 7,273.6 121.8 3,667.8 121.8 10,941.3 66.5% 730.8 These results are submitted to you as a guideline only, without liability on the part of CONTECH Engineered Solutions, LLC for accuracy or suitability to any particular application, and are subject to your verification.

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
2-YEAR 1-HOUR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A12.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 19
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 2.060 (CFS)
Total volume = 0.059 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 19
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.5 1.03 1.55 2.06 (Ft.)

0.083 0.03 0.00 0.000 O | | | | 0.01

0.167 0.17 0.00 0.001 O I | | | | 0.05

0.250 0.27 0.00 0.002 O I | | | | 0.14

0.333 0.32 0.00 0.004 O I | | | | 0.27

0.417 0.36 0.00 0.007 O I | | | | 0.41

0.500 0.39 0.00 0.009 O I | | | | 0.57

0.583 0.45 0.00 0.012 O I| | | | 0.73

0.667 0.52 0.00 0.015 O I | | | 0.91

0.750 0.67 0.00 0.020 O | I | | | 1.11

0.833 1.16 0.00 0.026 O | | I | | 1.40

0.917 2.06 0.00 0.037 O | | | I 1.82

1.000 1.15 0.00 0.048 O | |I | | 2.19

1.083 0.62 0.00 0.054 O |I | | | 2.38

1.167 0.26 0.00 0.057 O I | | | | 2.47

1.250 0.10 0.00 0.058 OI | | | | 2.51

1.333 0.05 0.00 0.059 O | | | | 2.52

1.417 0.02 0.00 0.059 O | | | | 2.53

1.500 0.00 0.01 0.059 O | | | | 2.53 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.00 0.01 0.059 O | | | | 2.53

1.667 0.00 0.01 0.059 O | | | | 2.53

1.750 0.00 0.00 0.059 O | | | | 2.53

1.833 0.00 0.00 0.059 O | | | | 2.53

1.917 0.00 0.00 0.059 O | | | | 2.53

2.000 0.00 0.00 0.059 O | | | | 2.53

2.083 0.00 0.00 0.059 O | | | | 2.53

2.167 0.00 0.00 0.059 O | | | | 2.53

2.250 0.00 0.00 0.059 O | | | | 2.53

2.333 0.00 0.00 0.059 O | | | | 2.52

2.417 0.00 0.00 0.059 O | | | | 2.52

2.500 0.00 0.00 0.059 O | | | | 2.52

2.583 0.00 0.00 0.059 O | | | | 2.52

2.667 0.00 0.00 0.059 O | | | | 2.52

2.750 0.00 0.00 0.059 O | | | | 2.52

2.833 0.00 0.00 0.059 O | | | | 2.52

2.917 0.00 0.00 0.059 O | | | | 2.52

3.000 0.00 0.00 0.059 O | | | | 2.52

3.083 0.00 0.00 0.059 O | | | | 2.52

3.167 0.00 0.00 0.059 O | | | | 2.52

3.250 0.00 0.00 0.059 O | | | | 2.52

3.333 0.00 0.00 0.059 O | | | | 2.52

3.417 0.00 0.00 0.059 O | | | | 2.52

3.500 0.00 0.00 0.058 O | | | | 2.52

3.583 0.00 0.00 0.058 O | | | | 2.51

3.667 0.00 0.00 0.058 O | | | | 2.51

3.750 0.00 0.00 0.058 O | | | | 2.51

3.833 0.00 0.00 0.058 O | | | | 2.51

3.917 0.00 0.00 0.058 O | | | | 2.51

4.000 0.00 0.00 0.058 O | | | | 2.51

4.083 0.00 0.00 0.058 O | | | | 2.51

4.167 0.00 0.00 0.058 O | | | | 2.51

4.250 0.00 0.00 0.058 O | | | | 2.51

4.333 0.00 0.00 0.058 O | | | | 2.51

4.417 0.00 0.00 0.058 O | | | | 2.51

4.500 0.00 0.00 0.058 O | | | | 2.51

4.583 0.00 0.00 0.058 O | | | | 2.51

4.667 0.00 0.00 0.058 O | | | | 2.51

4.750 0.00 0.00 0.058 O | | | | 2.51

4.833 0.00 0.00 0.058 O | | | | 2.51

4.917 0.00 0.00 0.058 O | | | | 2.51

5.000 0.00 0.00 0.058 O | | | | 2.51

5.083 0.00 0.00 0.058 O | | | | 2.51

5.167 0.00 0.00 0.058 O | | | | 2.51

5.250 0.00 0.00 0.058 O | | | | 2.51

5.333 0.00 0.00 0.058 O | | | | 2.51

5.417 0.00 0.00 0.058 O | | | | 2.51

5.500 0.00 0.00 0.058 O | | | | 2.51

5.583 0.00 0.00 0.058 O | | | | 2.51

5.667 0.00 0.00 0.058 O | | | | 2.51

5.750 0.00 0.00 0.058 O | | | | 2.51 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 69
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.005 (CFS)
Total volume = 0.001 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
2-YEAR 3-HOUR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A32.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 43
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.935 (CFS)
Total volume = 0.087 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 43
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.2 0.47 0.70 0.93 (Ft.)

0.083 0.02 0.00 0.000 O | | | | 0.00

0.167 0.10 0.00 0.000 O I | | | | 0.03

0.250 0.14 0.00 0.001 O I | | | | 0.08

0.333 0.14 0.00 0.002 O I | | | | 0.14

0.417 0.17 0.00 0.003 O I | | | | 0.21

0.500 0.18 0.00 0.005 O I | | | | 0.28

0.583 0.20 0.00 0.006 O I| | | | 0.37

0.667 0.20 0.00 0.007 O I | | | | 0.45

0.750 0.22 0.00 0.009 O I| | | | 0.54

0.833 0.22 0.00 0.010 O I| | | | 0.62

0.917 0.20 0.00 0.012 O I | | | | 0.70

1.000 0.20 0.00 0.013 O I | | | | 0.78

1.083 0.22 0.00 0.014 O I| | | | 0.86

1.167 0.25 0.00 0.016 O I | | | 0.95

1.250 0.27 0.00 0.018 O |I | | | 1.04

1.333 0.27 0.00 0.020 O |I | | | 1.12

1.417 0.27 0.00 0.022 O |I | | | 1.21

1.500 0.30 0.00 0.024 O | I | | | 1.30 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.32 0.00 0.026 O | I | | | 1.40

1.667 0.31 0.00 0.028 O | I | | | 1.49

1.750 0.34 0.00 0.030 O | I | | | 1.58

1.833 0.38 0.00 0.033 O | I | | | 1.66

1.917 0.38 0.00 0.035 O | I | | | 1.76

2.000 0.37 0.00 0.038 O | I | | | 1.85

2.083 0.38 0.00 0.040 O | I | | | 1.94

2.167 0.40 0.00 0.043 O | I | | | 2.03

2.250 0.49 0.00 0.046 O | I | | 2.13

2.333 0.55 0.00 0.050 O | | I | | 2.24

2.417 0.53 0.00 0.053 O | | I | | 2.36

2.500 0.73 0.00 0.058 O | | I | 2.49

2.583 0.85 0.02 0.063 O | | | I | 2.66

2.667 0.93 0.05 0.069 |O | | | I 2.84

2.750 0.77 0.08 0.074 | O | | | I | 3.01

2.833 0.46 0.09 0.078 | O | I| | | 3.12

2.917 0.32 0.10 0.080 | O | I | | | 3.18

3.000 0.25 0.10 0.081 | O I | | | 3.22

3.083 0.14 0.11 0.082 | OI | | | | 3.23

3.167 0.06 0.11 0.082 | IO | | | | 3.23

3.250 0.02 0.11 0.081 I O | | | | 3.22

3.333 0.01 0.10 0.081 I O | | | | 3.20

3.417 0.00 0.10 0.080 I O | | | | 3.18

3.500 0.00 0.10 0.080 I O | | | | 3.16

3.583 0.00 0.10 0.079 I O | | | | 3.14

3.667 0.00 0.09 0.078 I O | | | | 3.12

3.750 0.00 0.09 0.078 I O | | | | 3.11

3.833 0.00 0.09 0.077 I O | | | | 3.09

3.917 0.00 0.09 0.076 I O | | | | 3.07

4.000 0.00 0.08 0.076 I O | | | | 3.05

4.083 0.00 0.08 0.075 I O | | | | 3.04

4.167 0.00 0.08 0.075 I O | | | | 3.02

4.250 0.00 0.08 0.074 I O | | | | 3.00

4.333 0.00 0.08 0.074 I O | | | | 2.99

4.417 0.00 0.07 0.073 I O | | | | 2.97

4.500 0.00 0.07 0.073 I O | | | | 2.95

4.583 0.00 0.07 0.072 I O | | | | 2.94

4.667 0.00 0.07 0.072 I O | | | | 2.93

4.750 0.00 0.06 0.071 I O | | | | 2.91

4.833 0.00 0.06 0.071 I O | | | | 2.90

4.917 0.00 0.06 0.070 I O | | | | 2.88

5.000 0.00 0.06 0.070 IO | | | | 2.87

5.083 0.00 0.06 0.070 IO | | | | 2.86

5.167 0.00 0.05 0.069 IO | | | | 2.85

5.250 0.00 0.05 0.069 IO | | | | 2.84

5.333 0.00 0.05 0.068 IO | | | | 2.83

5.417 0.00 0.05 0.068 IO | | | | 2.81

5.500 0.00 0.05 0.068 IO | | | | 2.80

5.583 0.00 0.05 0.067 IO | | | | 2.79

5.667 0.00 0.04 0.067 IO | | | | 2.78

5.750 0.00 0.04 0.067 IO | | | | 2.77 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.00 0.04 0.067 IO | | | | 2.77

5.917 0.00 0.04 0.066 IO | | | | 2.76

6.000 0.00 0.04 0.066 IO | | | | 2.75

6.083 0.00 0.04 0.066 IO | | | | 2.74

6.167 0.00 0.04 0.065 IO | | | | 2.73

6.250 0.00 0.04 0.065 IO | | | | 2.72

6.333 0.00 0.03 0.065 IO | | | | 2.72

6.417 0.00 0.03 0.065 IO | | | | 2.71

6.500 0.00 0.03 0.065 IO | | | | 2.70

6.583 0.00 0.03 0.064 IO | | | | 2.70

6.667 0.00 0.03 0.064 IO | | | | 2.69

6.750 0.00 0.03 0.064 O | | | | 2.68

6.833 0.00 0.03 0.064 O | | | | 2.68

6.917 0.00 0.03 0.063 O | | | | 2.67

7.000 0.00 0.03 0.063 O | | | | 2.67

7.083 0.00 0.03 0.063 O | | | | 2.66

7.167 0.00 0.02 0.063 O | | | | 2.66

7.250 0.00 0.02 0.063 O | | | | 2.65

7.333 0.00 0.02 0.063 O | | | | 2.65

7.417 0.00 0.02 0.062 O | | | | 2.64

7.500 0.00 0.02 0.062 O | | | | 2.64

7.583 0.00 0.02 0.062 O | | | | 2.63

7.667 0.00 0.02 0.062 O | | | | 2.63

7.750 0.00 0.02 0.062 O | | | | 2.62

7.833 0.00 0.02 0.062 O | | | | 2.62

7.917 0.00 0.02 0.062 O | | | | 2.61

8.000 0.00 0.02 0.062 O | | | | 2.61

8.083 0.00 0.02 0.061 O | | | | 2.61

8.167 0.00 0.02 0.061 O | | | | 2.60

8.250 0.00 0.02 0.061 O | | | | 2.60

8.333 0.00 0.02 0.061 O | | | | 2.60

8.417 0.00 0.01 0.061 O | | | | 2.59

8.500 0.00 0.01 0.061 O | | | | 2.59

8.583 0.00 0.01 0.061 O | | | | 2.59

8.667 0.00 0.01 0.061 O | | | | 2.58

8.750 0.00 0.01 0.061 O | | | | 2.58

8.833 0.00 0.01 0.061 O | | | | 2.58

8.917 0.00 0.01 0.060 O | | | | 2.58

9.000 0.00 0.01 0.060 O | | | | 2.57

9.083 0.00 0.01 0.060 O | | | | 2.57

9.167 0.00 0.01 0.060 O | | | | 2.57

9.250 0.00 0.01 0.060 O | | | | 2.57

9.333 0.00 0.01 0.060 O | | | | 2.56

9.417 0.00 0.01 0.060 O | | | | 2.56

9.500 0.00 0.01 0.060 O | | | | 2.56

9.583 0.00 0.01 0.060 O | | | | 2.56

9.667 0.00 0.01 0.060 O | | | | 2.56

9.750 0.00 0.01 0.060 O | | | | 2.55

9.833 0.00 0.01 0.060 O | | | | 2.55

9.917 0.00 0.01 0.060 O | | | | 2.55

10.000 0.00 0.01 0.060 O | | | | 2.55 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.01 0.060 O | | | | 2.55

10.167 0.00 0.01 0.059 O | | | | 2.55

10.250 0.00 0.01 0.059 O | | | | 2.54

10.333 0.00 0.01 0.059 O | | | | 2.54

10.417 0.00 0.01 0.059 O | | | | 2.54

10.500 0.00 0.01 0.059 O | | | | 2.54

10.583 0.00 0.01 0.059 O | | | | 2.54

10.667 0.00 0.01 0.059 O | | | | 2.54

10.750 0.00 0.01 0.059 O | | | | 2.54

10.833 0.00 0.01 0.059 O | | | | 2.54

10.917 0.00 0.01 0.059 O | | | | 2.53

11.000 0.00 0.01 0.059 O | | | | 2.53

11.083 0.00 0.01 0.059 O | | | | 2.53

11.167 0.00 0.00 0.059 O | | | | 2.53

11.250 0.00 0.00 0.059 O | | | | 2.53

11.333 0.00 0.00 0.059 O | | | | 2.53

11.417 0.00 0.00 0.059 O | | | | 2.53

11.500 0.00 0.00 0.059 O | | | | 2.53

11.583 0.00 0.00 0.059 O | | | | 2.53

11.667 0.00 0.00 0.059 O | | | | 2.53

11.750 0.00 0.00 0.059 O | | | | 2.52

11.833 0.00 0.00 0.059 O | | | | 2.52

11.917 0.00 0.00 0.059 O | | | | 2.52

12.000 0.00 0.00 0.059 O | | | | 2.52

12.083 0.00 0.00 0.059 O | | | | 2.52

12.167 0.00 0.00 0.059 O | | | | 2.52

12.250 0.00 0.00 0.059 O | | | | 2.52

12.333 0.00 0.00 0.059 O | | | | 2.52

12.417 0.00 0.00 0.059 O | | | | 2.52

12.500 0.00 0.00 0.059 O | | | | 2.52

12.583 0.00 0.00 0.059 O | | | | 2.52

12.667 0.00 0.00 0.059 O | | | | 2.52

12.750 0.00 0.00 0.059 O | | | | 2.52

12.833 0.00 0.00 0.059 O | | | | 2.52

12.917 0.00 0.00 0.058 O | | | | 2.52

13.000 0.00 0.00 0.058 O | | | | 2.51

13.083 0.00 0.00 0.058 O | | | | 2.51

13.167 0.00 0.00 0.058 O | | | | 2.51

13.250 0.00 0.00 0.058 O | | | | 2.51

13.333 0.00 0.00 0.058 O | | | | 2.51

13.417 0.00 0.00 0.058 O | | | | 2.51

13.500 0.00 0.00 0.058 O | | | | 2.51

13.583 0.00 0.00 0.058 O | | | | 2.51

13.667 0.00 0.00 0.058 O | | | | 2.51

13.750 0.00 0.00 0.058 O | | | | 2.51

13.833 0.00 0.00 0.058 O | | | | 2.51

13.917 0.00 0.00 0.058 O | | | | 2.51

14.000 0.00 0.00 0.058 O | | | | 2.51

14.083 0.00 0.00 0.058 O | | | | 2.51

14.167 0.00 0.00 0.058 O | | | | 2.51

14.250 0.00 0.00 0.058 O | | | | 2.51 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.00 0.00 0.058 O | | | | 2.51

14.417 0.00 0.00 0.058 O | | | | 2.51

14.500 0.00 0.00 0.058 O | | | | 2.51

14.583 0.00 0.00 0.058 O | | | | 2.51

14.667 0.00 0.00 0.058 O | | | | 2.51

14.750 0.00 0.00 0.058 O | | | | 2.51

14.833 0.00 0.00 0.058 O | | | | 2.51

14.917 0.00 0.00 0.058 O | | | | 2.51

15.000 0.00 0.00 0.058 O | | | | 2.51

15.083 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 181
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.107 (CFS)
Total volume = 0.029 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
2-YEAR 6-HOUR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A62.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 79
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.748 (CFS)
Total volume = 0.108 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 79
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.2 0.37 0.56 0.75 (Ft.)

0.083 0.01 0.00 0.000 O | | | | 0.00

0.167 0.05 0.00 0.000 O I | | | | 0.01

0.250 0.08 0.00 0.001 O I | | | | 0.04

0.333 0.09 0.00 0.001 O I | | | | 0.08

0.417 0.09 0.00 0.002 O I | | | | 0.12

0.500 0.09 0.00 0.002 O I | | | | 0.16

0.583 0.10 0.00 0.003 O I | | | | 0.20

0.667 0.11 0.00 0.004 O I | | | | 0.24

0.750 0.11 0.00 0.005 O I | | | | 0.29

0.833 0.11 0.00 0.005 O I | | | | 0.34

0.917 0.11 0.00 0.006 O I | | | | 0.38

1.000 0.11 0.00 0.007 O I | | | | 0.43

1.083 0.12 0.00 0.008 O I | | | | 0.48

1.167 0.12 0.00 0.009 O I | | | | 0.53

1.250 0.12 0.00 0.009 O I | | | | 0.58

1.333 0.13 0.00 0.010 O I | | | | 0.62

1.417 0.13 0.00 0.011 O I | | | | 0.67

1.500 0.13 0.00 0.012 O I | | | | 0.72 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.13 0.00 0.013 O I | | | | 0.77

1.667 0.13 0.00 0.014 O I | | | | 0.81

1.750 0.13 0.00 0.015 O I | | | | 0.86

1.833 0.13 0.00 0.015 O I | | | | 0.91

1.917 0.13 0.00 0.016 O I | | | | 0.96

2.000 0.13 0.00 0.017 O I | | | | 1.00

2.083 0.13 0.00 0.018 O I | | | | 1.04

2.167 0.13 0.00 0.019 O I | | | | 1.09

2.250 0.14 0.00 0.020 O I | | | | 1.13

2.333 0.14 0.00 0.021 O I | | | | 1.17

2.417 0.14 0.00 0.022 O I | | | | 1.21

2.500 0.14 0.00 0.023 O I | | | | 1.26

2.583 0.14 0.00 0.024 O I | | | | 1.30

2.667 0.14 0.00 0.025 O I | | | | 1.35

2.750 0.14 0.00 0.026 O I | | | | 1.39

2.833 0.15 0.00 0.027 O I | | | | 1.44

2.917 0.15 0.00 0.028 O I | | | | 1.48

3.000 0.16 0.00 0.029 O I | | | | 1.53

3.083 0.16 0.00 0.030 O I | | | | 1.56

3.167 0.16 0.00 0.031 O I | | | | 1.60

3.250 0.17 0.00 0.032 O I| | | | 1.64

3.333 0.17 0.00 0.033 O I| | | | 1.69

3.417 0.17 0.00 0.034 O I| | | | 1.73

3.500 0.18 0.00 0.036 O I| | | | 1.77

3.583 0.20 0.00 0.037 O I | | | 1.82

3.667 0.21 0.00 0.038 O |I | | | 1.87

3.750 0.22 0.00 0.040 O |I | | | 1.92

3.833 0.23 0.00 0.041 O |I | | | 1.98

3.917 0.23 0.00 0.043 O | I | | | 2.03

4.000 0.24 0.00 0.045 O | I | | | 2.08

4.083 0.25 0.00 0.046 O | I | | | 2.13

4.167 0.26 0.00 0.048 O | I | | | 2.19

4.250 0.28 0.00 0.050 O | I | | | 2.25

4.333 0.29 0.00 0.052 O | I | | | 2.31

4.417 0.31 0.00 0.054 O | I | | | 2.37

4.500 0.32 0.00 0.056 O | I | | | 2.44

4.583 0.33 0.00 0.058 O | I | | | 2.51

4.667 0.34 0.01 0.061 O | I | | | 2.58

4.750 0.35 0.02 0.063 |O | I| | | 2.65

4.833 0.37 0.03 0.065 |O | I| | | 2.72

4.917 0.38 0.05 0.067 |O | I | | 2.79

5.000 0.39 0.06 0.070 | O | I | | 2.86

5.083 0.41 0.07 0.072 | O | |I | | 2.94

5.167 0.46 0.08 0.074 | O | | I | | 3.01

5.250 0.53 0.09 0.077 | O | | I | | 3.10

5.333 0.58 0.10 0.080 | O | | I | 3.19

5.417 0.64 0.11 0.084 | O | | | I | 3.29

5.500 0.71 0.13 0.088 | O | | | I | 3.40

5.583 0.75 0.14 0.092 | O | | | I| 3.52

5.667 0.47 0.15 0.095 | O | | I | | 3.62

5.750 0.27 0.15 0.096 | O | I | | | 3.66 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.17 0.15 0.097 | OI| | | | 3.67

5.917 0.11 0.15 0.097 | I O | | | | 3.67

6.000 0.07 0.15 0.096 | I O | | | | 3.66

6.083 0.05 0.15 0.096 |I O | | | | 3.64

6.167 0.02 0.15 0.095 I O | | | | 3.62

6.250 0.01 0.15 0.094 I O | | | | 3.59

6.333 0.00 0.14 0.093 I O | | | | 3.56

6.417 0.00 0.14 0.092 I O | | | | 3.53

6.500 0.00 0.14 0.091 I O | | | | 3.50

6.583 0.00 0.14 0.090 I O | | | | 3.47

6.667 0.00 0.13 0.089 I O | | | | 3.45

6.750 0.00 0.13 0.088 I O | | | | 3.42

6.833 0.00 0.13 0.087 I O | | | | 3.39

6.917 0.00 0.12 0.087 I O | | | | 3.37

7.000 0.00 0.12 0.086 I O | | | | 3.34

7.083 0.00 0.12 0.085 I O | | | | 3.32

7.167 0.00 0.11 0.084 I O | | | | 3.30

7.250 0.00 0.11 0.083 I O | | | | 3.27

7.333 0.00 0.11 0.083 I O | | | | 3.25

7.417 0.00 0.11 0.082 I O | | | | 3.23

7.500 0.00 0.10 0.081 I O | | | | 3.21

7.583 0.00 0.10 0.080 I O | | | | 3.19

7.667 0.00 0.10 0.080 I O | | | | 3.17

7.750 0.00 0.10 0.079 I O | | | | 3.15

7.833 0.00 0.09 0.078 I O | | | | 3.13

7.917 0.00 0.09 0.078 I O | | | | 3.11

8.000 0.00 0.09 0.077 I O | | | | 3.09

8.083 0.00 0.09 0.076 I O | | | | 3.07

8.167 0.00 0.08 0.076 I O | | | | 3.06

8.250 0.00 0.08 0.075 I O | | | | 3.04

8.333 0.00 0.08 0.075 I O | | | | 3.02

8.417 0.00 0.08 0.074 I O | | | | 3.01

8.500 0.00 0.08 0.074 I O | | | | 2.99

8.583 0.00 0.07 0.073 I O | | | | 2.97

8.667 0.00 0.07 0.073 I O | | | | 2.96

8.750 0.00 0.07 0.072 I O | | | | 2.94

8.833 0.00 0.07 0.072 I O | | | | 2.93

8.917 0.00 0.06 0.071 I O | | | | 2.91

9.000 0.00 0.06 0.071 I O | | | | 2.90

9.083 0.00 0.06 0.070 I O | | | | 2.89

9.167 0.00 0.06 0.070 I O | | | | 2.87

9.250 0.00 0.06 0.070 I O | | | | 2.86

9.333 0.00 0.05 0.069 I O | | | | 2.85

9.417 0.00 0.05 0.069 I O | | | | 2.84

9.500 0.00 0.05 0.068 I O | | | | 2.83

9.583 0.00 0.05 0.068 I O | | | | 2.82

9.667 0.00 0.05 0.068 I O | | | | 2.81

9.750 0.00 0.05 0.067 IO | | | | 2.80

9.833 0.00 0.04 0.067 IO | | | | 2.79

9.917 0.00 0.04 0.067 IO | | | | 2.78

10.000 0.00 0.04 0.067 IO | | | | 2.77 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.04 0.066 IO | | | | 2.76

10.167 0.00 0.04 0.066 IO | | | | 2.75

10.250 0.00 0.04 0.066 IO | | | | 2.74

10.333 0.00 0.04 0.065 IO | | | | 2.73

10.417 0.00 0.04 0.065 IO | | | | 2.73

10.500 0.00 0.03 0.065 IO | | | | 2.72

10.583 0.00 0.03 0.065 IO | | | | 2.71

10.667 0.00 0.03 0.065 IO | | | | 2.70

10.750 0.00 0.03 0.064 IO | | | | 2.70

10.833 0.00 0.03 0.064 IO | | | | 2.69

10.917 0.00 0.03 0.064 IO | | | | 2.68

11.000 0.00 0.03 0.064 IO | | | | 2.68

11.083 0.00 0.03 0.064 IO | | | | 2.67

11.167 0.00 0.03 0.063 IO | | | | 2.67

11.250 0.00 0.03 0.063 IO | | | | 2.66

11.333 0.00 0.02 0.063 IO | | | | 2.66

11.417 0.00 0.02 0.063 IO | | | | 2.65

11.500 0.00 0.02 0.063 O | | | | 2.65

11.583 0.00 0.02 0.063 O | | | | 2.64

11.667 0.00 0.02 0.062 O | | | | 2.64

11.750 0.00 0.02 0.062 O | | | | 2.63

11.833 0.00 0.02 0.062 O | | | | 2.63

11.917 0.00 0.02 0.062 O | | | | 2.62

12.000 0.00 0.02 0.062 O | | | | 2.62

12.083 0.00 0.02 0.062 O | | | | 2.62

12.167 0.00 0.02 0.062 O | | | | 2.61

12.250 0.00 0.02 0.061 O | | | | 2.61

12.333 0.00 0.02 0.061 O | | | | 2.60

12.417 0.00 0.02 0.061 O | | | | 2.60

12.500 0.00 0.02 0.061 O | | | | 2.60

12.583 0.00 0.01 0.061 O | | | | 2.59

12.667 0.00 0.01 0.061 O | | | | 2.59

12.750 0.00 0.01 0.061 O | | | | 2.59

12.833 0.00 0.01 0.061 O | | | | 2.59

12.917 0.00 0.01 0.061 O | | | | 2.58

13.000 0.00 0.01 0.061 O | | | | 2.58

13.083 0.00 0.01 0.060 O | | | | 2.58

13.167 0.00 0.01 0.060 O | | | | 2.57

13.250 0.00 0.01 0.060 O | | | | 2.57

13.333 0.00 0.01 0.060 O | | | | 2.57

13.417 0.00 0.01 0.060 O | | | | 2.57

13.500 0.00 0.01 0.060 O | | | | 2.57

13.583 0.00 0.01 0.060 O | | | | 2.56

13.667 0.00 0.01 0.060 O | | | | 2.56

13.750 0.00 0.01 0.060 O | | | | 2.56

13.833 0.00 0.01 0.060 O | | | | 2.56

13.917 0.00 0.01 0.060 O | | | | 2.56

14.000 0.00 0.01 0.060 O | | | | 2.55

14.083 0.00 0.01 0.060 O | | | | 2.55

14.167 0.00 0.01 0.060 O | | | | 2.55

14.250 0.00 0.01 0.060 O | | | | 2.55 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.00 0.01 0.059 O | | | | 2.55

14.417 0.00 0.01 0.059 O | | | | 2.55

14.500 0.00 0.01 0.059 O | | | | 2.54

14.583 0.00 0.01 0.059 O | | | | 2.54

14.667 0.00 0.01 0.059 O | | | | 2.54

14.750 0.00 0.01 0.059 O | | | | 2.54

14.833 0.00 0.01 0.059 O | | | | 2.54

14.917 0.00 0.01 0.059 O | | | | 2.54

15.000 0.00 0.01 0.059 O | | | | 2.54

15.083 0.00 0.01 0.059 O | | | | 2.53

15.167 0.00 0.01 0.059 O | | | | 2.53

15.250 0.00 0.01 0.059 O | | | | 2.53

15.333 0.00 0.00 0.059 O | | | | 2.53

15.417 0.00 0.00 0.059 O | | | | 2.53

15.500 0.00 0.00 0.059 O | | | | 2.53

15.583 0.00 0.00 0.059 O | | | | 2.53

15.667 0.00 0.00 0.059 O | | | | 2.53

15.750 0.00 0.00 0.059 O | | | | 2.53

15.833 0.00 0.00 0.059 O | | | | 2.53

15.917 0.00 0.00 0.059 O | | | | 2.52

16.000 0.00 0.00 0.059 O | | | | 2.52

16.083 0.00 0.00 0.059 O | | | | 2.52

16.167 0.00 0.00 0.059 O | | | | 2.52

16.250 0.00 0.00 0.059 O | | | | 2.52

16.333 0.00 0.00 0.059 O | | | | 2.52

16.417 0.00 0.00 0.059 O | | | | 2.52

16.500 0.00 0.00 0.059 O | | | | 2.52

16.583 0.00 0.00 0.059 O | | | | 2.52

16.667 0.00 0.00 0.059 O | | | | 2.52

16.750 0.00 0.00 0.059 O | | | | 2.52

16.833 0.00 0.00 0.059 O | | | | 2.52

16.917 0.00 0.00 0.059 O | | | | 2.52

17.000 0.00 0.00 0.059 O | | | | 2.52

17.083 0.00 0.00 0.058 O | | | | 2.52

17.167 0.00 0.00 0.058 O | | | | 2.51

17.250 0.00 0.00 0.058 O | | | | 2.51

17.333 0.00 0.00 0.058 O | | | | 2.51

17.417 0.00 0.00 0.058 O | | | | 2.51

17.500 0.00 0.00 0.058 O | | | | 2.51

17.583 0.00 0.00 0.058 O | | | | 2.51

17.667 0.00 0.00 0.058 O | | | | 2.51

17.750 0.00 0.00 0.058 O | | | | 2.51

17.833 0.00 0.00 0.058 O | | | | 2.51

17.917 0.00 0.00 0.058 O | | | | 2.51

18.000 0.00 0.00 0.058 O | | | | 2.51

18.083 0.00 0.00 0.058 O | | | | 2.51

18.167 0.00 0.00 0.058 O | | | | 2.51

18.250 0.00 0.00 0.058 O | | | | 2.51

18.333 0.00 0.00 0.058 O | | | | 2.51

18.417 0.00 0.00 0.058 O | | | | 2.51

18.500 0.00 0.00 0.058 O | | | | 2.51 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

18.583 0.00 0.00 0.058 O | | | | 2.51

18.667 0.00 0.00 0.058 O | | | | 2.51

18.750 0.00 0.00 0.058 O | | | | 2.51

18.833 0.00 0.00 0.058 O | | | | 2.51

18.917 0.00 0.00 0.058 O | | | | 2.51

19.000 0.00 0.00 0.058 O | | | | 2.51

19.083 0.00 0.00 0.058 O | | | | 2.51

19.167 0.00 0.00 0.058 O | | | | 2.51

19.250 0.00 0.00 0.058 O | | | | 2.51

19.333 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 232
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.155 (CFS)
Total volume = 0.050 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
2-YEAR 24-HOUR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A242.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 295
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.284 (CFS)
Total volume = 0.173 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 295
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.1 0.14 0.21 0.28 (Ft.)

0.083 0.00 0.00 0.000 O | | | | 0.00

0.167 0.01 0.00 0.000 OI | | | | 0.00

0.250 0.01 0.00 0.000 OI | | | | 0.01

0.333 0.02 0.00 0.000 OI | | | | 0.02

0.417 0.02 0.00 0.000 O I | | | | 0.02

0.500 0.02 0.00 0.001 O I | | | | 0.03

0.583 0.02 0.00 0.001 O I | | | | 0.04

0.667 0.02 0.00 0.001 O I | | | | 0.05

0.750 0.03 0.00 0.001 O I | | | | 0.06

0.833 0.03 0.00 0.001 O I | | | | 0.08

0.917 0.03 0.00 0.001 O I | | | | 0.09

1.000 0.03 0.00 0.002 O I | | | | 0.10

1.083 0.03 0.00 0.002 O I | | | | 0.11

1.167 0.03 0.00 0.002 O I | | | | 0.13

1.250 0.03 0.00 0.002 O I | | | | 0.14

1.333 0.03 0.00 0.002 O I | | | | 0.15

1.417 0.03 0.00 0.003 O I | | | | 0.16

1.500 0.03 0.00 0.003 O I | | | | 0.17 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.03 0.00 0.003 O I | | | | 0.18

1.667 0.03 0.00 0.003 O I | | | | 0.19

1.750 0.03 0.00 0.003 O I | | | | 0.20

1.833 0.03 0.00 0.003 O I | | | | 0.21

1.917 0.03 0.00 0.004 O I | | | | 0.23

2.000 0.03 0.00 0.004 O I | | | | 0.24

2.083 0.03 0.00 0.004 O I | | | | 0.25

2.167 0.03 0.00 0.004 O I | | | | 0.27

2.250 0.03 0.00 0.005 O I | | | | 0.28

2.333 0.03 0.00 0.005 O I | | | | 0.30

2.417 0.03 0.00 0.005 O I | | | | 0.31

2.500 0.03 0.00 0.005 O I | | | | 0.32

2.583 0.03 0.00 0.005 O I | | | | 0.34

2.667 0.04 0.00 0.006 O I | | | | 0.35

2.750 0.04 0.00 0.006 O I | | | | 0.37

2.833 0.04 0.00 0.006 O I | | | | 0.39

2.917 0.04 0.00 0.006 O I | | | | 0.41

3.000 0.04 0.00 0.007 O I | | | | 0.42

3.083 0.04 0.00 0.007 O I | | | | 0.44

3.167 0.04 0.00 0.007 O I | | | | 0.46

3.250 0.04 0.00 0.008 O I | | | | 0.48

3.333 0.04 0.00 0.008 O I | | | | 0.49

3.417 0.04 0.00 0.008 O I | | | | 0.51

3.500 0.04 0.00 0.008 O I | | | | 0.53

3.583 0.04 0.00 0.009 O I | | | | 0.54

3.667 0.04 0.00 0.009 O I | | | | 0.56

3.750 0.04 0.00 0.009 O I | | | | 0.57

3.833 0.04 0.00 0.010 O I | | | | 0.59

3.917 0.05 0.00 0.010 O I | | | | 0.61

4.000 0.05 0.00 0.010 O I | | | | 0.62

4.083 0.05 0.00 0.011 O I | | | | 0.64

4.167 0.05 0.00 0.011 O I | | | | 0.66

4.250 0.05 0.00 0.011 O I | | | | 0.68

4.333 0.05 0.00 0.012 O I | | | | 0.70

4.417 0.06 0.00 0.012 O I | | | | 0.72

4.500 0.06 0.00 0.012 O I | | | | 0.74

4.583 0.06 0.00 0.013 O I | | | | 0.76

4.667 0.06 0.00 0.013 O I | | | | 0.78

4.750 0.06 0.00 0.014 O I | | | | 0.81

4.833 0.06 0.00 0.014 O I | | | | 0.83

4.917 0.06 0.00 0.014 O I| | | | 0.85

5.000 0.07 0.00 0.015 O I| | | | 0.88

5.083 0.06 0.00 0.015 O I| | | | 0.90

5.167 0.06 0.00 0.016 O I | | | | 0.92

5.250 0.05 0.00 0.016 O I | | | | 0.94

5.333 0.05 0.00 0.016 O I | | | | 0.96

5.417 0.06 0.00 0.017 O I | | | | 0.98

5.500 0.06 0.00 0.017 O I | | | | 1.00

5.583 0.06 0.00 0.017 O I | | | | 1.02

5.667 0.06 0.00 0.018 O I| | | | 1.04

5.750 0.07 0.00 0.018 O I| | | | 1.06 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.07 0.00 0.019 O I| | | | 1.08

5.917 0.07 0.00 0.019 O I| | | | 1.10

6.000 0.07 0.00 0.020 O I| | | | 1.12

6.083 0.07 0.00 0.020 O I| | | | 1.14

6.167 0.07 0.00 0.021 O I | | | 1.17

6.250 0.07 0.00 0.021 O I | | | 1.19

6.333 0.07 0.00 0.022 O I | | | 1.21

6.417 0.08 0.00 0.022 O I | | | 1.23

6.500 0.08 0.00 0.023 O I | | | 1.26

6.583 0.08 0.00 0.023 O I | | | 1.28

6.667 0.08 0.00 0.024 O |I | | | 1.31

6.750 0.08 0.00 0.024 O |I | | | 1.33

6.833 0.08 0.00 0.025 O |I | | | 1.36

6.917 0.08 0.00 0.025 O |I | | | 1.38

7.000 0.08 0.00 0.026 O |I | | | 1.41

7.083 0.08 0.00 0.027 O |I | | | 1.44

7.167 0.08 0.00 0.027 O |I | | | 1.46

7.250 0.08 0.00 0.028 O |I | | | 1.49

7.333 0.08 0.00 0.028 O |I | | | 1.51

7.417 0.09 0.00 0.029 O | I | | | 1.53

7.500 0.09 0.00 0.030 O | I | | | 1.55

7.583 0.09 0.00 0.030 O | I | | | 1.58

7.667 0.10 0.00 0.031 O | I | | | 1.60

7.750 0.10 0.00 0.031 O | I | | | 1.62

7.833 0.10 0.00 0.032 O | I | | | 1.65

7.917 0.11 0.00 0.033 O | I | | | 1.67

8.000 0.11 0.00 0.034 O | I | | | 1.70

8.083 0.11 0.00 0.034 O | I | | | 1.73

8.167 0.12 0.00 0.035 O | I | | | 1.76

8.250 0.12 0.00 0.036 O | I | | | 1.79

8.333 0.12 0.00 0.037 O | I | | | 1.82

8.417 0.13 0.00 0.038 O | I | | | 1.85

8.500 0.13 0.00 0.039 O | I | | | 1.88

8.583 0.13 0.00 0.039 O | I | | | 1.91

8.667 0.13 0.00 0.040 O | I | | | 1.94

8.750 0.13 0.00 0.041 O | I | | | 1.97

8.833 0.13 0.00 0.042 O | I| | | 2.01

8.917 0.14 0.00 0.043 O | I| | | 2.03

9.000 0.14 0.00 0.044 O | I| | | 2.06

9.083 0.14 0.00 0.045 O | I | | 2.10

9.167 0.15 0.00 0.046 O | |I | | 2.13

9.250 0.16 0.00 0.047 O | |I | | 2.16

9.333 0.16 0.00 0.048 O | |I | | 2.19

9.417 0.16 0.00 0.049 O | | I | | 2.23

9.500 0.17 0.00 0.050 O | | I | | 2.26

9.583 0.17 0.00 0.052 O | | I | | 2.30

9.667 0.17 0.00 0.053 O | | I | | 2.34

9.750 0.17 0.00 0.054 O | | I | | 2.37

9.833 0.18 0.00 0.055 O | | I | | 2.41

9.917 0.18 0.00 0.056 O | | I | | 2.45

10.000 0.18 0.00 0.058 O | | I | | 2.49 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.18 0.00 0.059 O | | I | | 2.53

10.167 0.15 0.01 0.060 |O | I | | 2.56

10.250 0.13 0.01 0.061 |O | I| | | 2.59

10.333 0.13 0.02 0.062 | O | I | | | 2.61

10.417 0.13 0.02 0.062 | O | I | | | 2.64

10.500 0.13 0.03 0.063 | O | I | | | 2.66

10.583 0.13 0.03 0.064 | O | I | | | 2.68

10.667 0.15 0.03 0.065 | O | |I | | 2.71

10.750 0.16 0.04 0.065 | O | | I | | 2.73

10.833 0.16 0.04 0.066 | O | | I | | 2.76

10.917 0.17 0.04 0.067 | O | | I | | 2.79

11.000 0.17 0.05 0.068 | O | | I | | 2.81

11.083 0.17 0.05 0.069 | O | | I | | 2.84

11.167 0.16 0.06 0.070 | O | | I | | 2.86

11.250 0.16 0.06 0.070 | O | | I | | 2.88

11.333 0.16 0.06 0.071 | O| |I | | 2.90

11.417 0.16 0.07 0.072 | O| |I | | 2.92

11.500 0.16 0.07 0.072 | O| |I | | 2.94

11.583 0.16 0.07 0.073 | O |I | | 2.96

11.667 0.15 0.07 0.073 | O I | | 2.98

11.750 0.15 0.08 0.074 | O I | | 3.00

11.833 0.14 0.08 0.074 | O I | | 3.01

11.917 0.15 0.08 0.075 | |O I | | 3.02

12.000 0.15 0.08 0.075 | |O I | | 3.04

12.083 0.16 0.08 0.076 | |O |I | | 3.05

12.167 0.19 0.09 0.076 | |O | I | | 3.07

12.250 0.20 0.09 0.077 | | O | I | | 3.09

12.333 0.21 0.09 0.078 | | O | I| | 3.11

12.417 0.21 0.09 0.079 | | O | I | 3.14

12.500 0.22 0.10 0.079 | | O | I | 3.16

12.583 0.22 0.10 0.080 | | O | I | 3.18

12.667 0.23 0.10 0.081 | | O | |I | 3.21

12.750 0.23 0.11 0.082 | | O | | I | 3.23

12.833 0.23 0.11 0.083 | | O | | I | 3.26

12.917 0.24 0.11 0.084 | | O | | I | 3.28

13.000 0.24 0.12 0.085 | | O | | I | 3.31

13.083 0.25 0.12 0.085 | | O | | I | 3.34

13.167 0.27 0.12 0.086 | | O | | I | 3.36

13.250 0.28 0.13 0.087 | | O | | I| 3.39

13.333 0.28 0.13 0.088 | | O | | I| 3.42

13.417 0.28 0.13 0.089 | | O| | I| 3.45

13.500 0.28 0.14 0.090 | | O| | I| 3.48

13.583 0.27 0.14 0.091 | | O| | I | 3.51

13.667 0.23 0.14 0.092 | | O |I | 3.53

13.750 0.21 0.14 0.093 | | O I| | 3.55

13.833 0.20 0.15 0.093 | | O I | | 3.56

13.917 0.20 0.15 0.093 | | O I | | 3.57

14.000 0.19 0.15 0.094 | | O I | | 3.58

14.083 0.20 0.15 0.094 | | O I | | 3.59

14.167 0.21 0.15 0.095 | | O I | 3.60

14.250 0.22 0.15 0.095 | | O I | 3.62 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.22 0.15 0.095 | | O |I | 3.63

14.417 0.22 0.15 0.096 | | |O I | 3.65

14.500 0.22 0.15 0.096 | | |O I | 3.66

14.583 0.22 0.15 0.097 | | |O I | 3.67

14.667 0.22 0.16 0.097 | | |O I | 3.68

14.750 0.22 0.16 0.098 | | |O I | 3.70

14.833 0.22 0.16 0.098 | | |O I | 3.71

14.917 0.21 0.16 0.099 | | |O I| | 3.72

15.000 0.21 0.16 0.099 | | |O I| | 3.73

15.083 0.21 0.16 0.099 | | | O I| | 3.74

15.167 0.20 0.16 0.100 | | | O I | | 3.75

15.250 0.20 0.16 0.100 | | | O I | | 3.76

15.333 0.20 0.16 0.100 | | | O I | | 3.77

15.417 0.20 0.16 0.100 | | | O I | | 3.78

15.500 0.19 0.16 0.101 | | | O I | | 3.78

15.583 0.19 0.16 0.101 | | | O I | | 3.79

15.667 0.17 0.16 0.101 | | | OI | | 3.79

15.750 0.16 0.16 0.101 | | | O | | 3.79

15.833 0.16 0.16 0.101 | | | O | | 3.79

15.917 0.16 0.16 0.101 | | | O | | 3.79

16.000 0.16 0.16 0.101 | | |IO | | 3.79

16.083 0.15 0.16 0.101 | | I O | | 3.79

16.167 0.08 0.16 0.100 | I | O | | 3.78

16.250 0.05 0.16 0.100 | I | | O | | 3.76

16.333 0.04 0.16 0.099 | I | |O | | 3.73

16.417 0.04 0.16 0.098 | I | |O | | 3.71

16.500 0.04 0.16 0.097 | I | |O | | 3.69

16.583 0.03 0.15 0.096 | I | |O | | 3.66

16.667 0.03 0.15 0.096 | I | |O | | 3.64

16.750 0.03 0.15 0.095 | I | O | | 3.61

16.833 0.03 0.15 0.094 | I | O | | 3.59

16.917 0.03 0.15 0.093 | I | O | | 3.56

17.000 0.03 0.14 0.092 | I | O | | 3.54

17.083 0.03 0.14 0.092 | I | O| | | 3.51

17.167 0.04 0.14 0.091 | I | O| | | 3.49

17.250 0.04 0.14 0.090 | I | O| | | 3.47

17.333 0.04 0.13 0.089 | I | O| | | 3.45

17.417 0.04 0.13 0.089 | I | O | | | 3.43

17.500 0.04 0.13 0.088 | I | O | | | 3.42

17.583 0.04 0.13 0.088 | I | O | | | 3.40

17.667 0.04 0.13 0.087 | I | O | | | 3.38

17.750 0.04 0.12 0.086 | I | O | | | 3.37

17.833 0.04 0.12 0.086 | I | O | | | 3.35

17.917 0.04 0.12 0.085 | I | O | | | 3.33

18.000 0.03 0.12 0.085 | I | O | | | 3.32

18.083 0.03 0.12 0.084 | I | O | | | 3.30

18.167 0.03 0.11 0.084 | I | O | | | 3.28

18.250 0.03 0.11 0.083 | I | O | | | 3.27

18.333 0.03 0.11 0.083 | I | O | | | 3.25

18.417 0.03 0.11 0.082 | I | O | | | 3.24

18.500 0.03 0.11 0.082 | I | O | | | 3.22 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

18.583 0.03 0.10 0.081 | I | O | | | 3.21

18.667 0.03 0.10 0.081 | I | O | | | 3.19

18.750 0.03 0.10 0.080 | I | O | | | 3.18

18.833 0.02 0.10 0.080 | I | O | | | 3.16

18.917 0.02 0.10 0.079 | I | O | | | 3.15

19.000 0.02 0.09 0.078 | I | O | | | 3.13

19.083 0.02 0.09 0.078 | I | O | | | 3.12

19.167 0.02 0.09 0.077 | I | O | | | 3.10

19.250 0.02 0.09 0.077 | I | O | | | 3.09

19.333 0.03 0.09 0.077 | I |O | | | 3.08

19.417 0.03 0.09 0.076 | I |O | | | 3.06

19.500 0.03 0.08 0.076 | I |O | | | 3.05

19.583 0.03 0.08 0.075 | I |O | | | 3.04

19.667 0.03 0.08 0.075 | I |O | | | 3.03

19.750 0.03 0.08 0.075 | I |O | | | 3.02

19.833 0.02 0.08 0.074 | I O | | | 3.01

19.917 0.02 0.08 0.074 | I O | | | 3.00

20.000 0.02 0.08 0.074 | I O | | | 2.99

20.083 0.02 0.07 0.073 | I O | | | 2.97

20.167 0.02 0.07 0.073 | I O | | | 2.96

20.250 0.02 0.07 0.072 | I O| | | | 2.95

20.333 0.02 0.07 0.072 | I O| | | | 2.94

20.417 0.02 0.07 0.072 | I O| | | | 2.93

20.500 0.03 0.07 0.072 | I O| | | | 2.92

20.583 0.03 0.06 0.071 | I O| | | | 2.92

20.667 0.03 0.06 0.071 | I O| | | | 2.91

20.750 0.03 0.06 0.071 | I O | | | | 2.90

20.833 0.02 0.06 0.071 | I O | | | | 2.89

20.917 0.02 0.06 0.070 | I O | | | | 2.88

21.000 0.02 0.06 0.070 | I O | | | | 2.87

21.083 0.02 0.06 0.070 | I O | | | | 2.87

21.167 0.02 0.06 0.069 | I O | | | | 2.86

21.250 0.02 0.05 0.069 | I O | | | | 2.85

21.333 0.02 0.05 0.069 | I O | | | | 2.84

21.417 0.02 0.05 0.069 | I O | | | | 2.84

21.500 0.02 0.05 0.069 | I O | | | | 2.83

21.583 0.02 0.05 0.068 | I O | | | | 2.82

21.667 0.02 0.05 0.068 | I O | | | | 2.82

21.750 0.02 0.05 0.068 | I O | | | | 2.81

21.833 0.02 0.05 0.068 | I O | | | | 2.81

21.917 0.02 0.05 0.068 | I O | | | | 2.80

22.000 0.02 0.05 0.067 | I O | | | | 2.79

22.083 0.02 0.05 0.067 | I O | | | | 2.79

22.167 0.02 0.04 0.067 | I O | | | | 2.78

22.250 0.02 0.04 0.067 | I O | | | | 2.78

22.333 0.02 0.04 0.067 | I O | | | | 2.77

22.417 0.02 0.04 0.067 | I O | | | | 2.77

22.500 0.02 0.04 0.066 | I O | | | | 2.77

22.583 0.02 0.04 0.066 |I O | | | | 2.76

22.667 0.02 0.04 0.066 |I O | | | | 2.76

22.750 0.02 0.04 0.066 |I O | | | | 2.75 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

22.833 0.02 0.04 0.066 |I O | | | | 2.75

22.917 0.02 0.04 0.066 |I O | | | | 2.74

23.000 0.02 0.04 0.066 |I O | | | | 2.74

23.083 0.02 0.04 0.065 |I O | | | | 2.73

23.167 0.02 0.04 0.065 |I O | | | | 2.73

23.250 0.02 0.04 0.065 |I O | | | | 2.72

23.333 0.02 0.03 0.065 |I O | | | | 2.72

23.417 0.02 0.03 0.065 |I O | | | | 2.72

23.500 0.02 0.03 0.065 |I O | | | | 2.71

23.583 0.02 0.03 0.065 |I O | | | | 2.71

23.667 0.02 0.03 0.065 |I O | | | | 2.71

23.750 0.02 0.03 0.064 |I O | | | | 2.70

23.833 0.02 0.03 0.064 |I O | | | | 2.70

23.917 0.02 0.03 0.064 |I O | | | | 2.70

24.000 0.02 0.03 0.064 |I O | | | | 2.69

24.083 0.01 0.03 0.064 |I O | | | | 2.69

24.167 0.01 0.03 0.064 I O | | | | 2.69

24.250 0.00 0.03 0.064 I O | | | | 2.68

24.333 0.00 0.03 0.064 I O | | | | 2.68

24.417 0.00 0.03 0.063 I O | | | | 2.67

24.500 0.00 0.03 0.063 I O | | | | 2.66

24.583 0.00 0.02 0.063 I O | | | | 2.66

24.667 0.00 0.02 0.063 I O | | | | 2.65

24.750 0.00 0.02 0.063 I O | | | | 2.65

24.833 0.00 0.02 0.063 I O | | | | 2.64

24.917 0.00 0.02 0.062 I O | | | | 2.64

25.000 0.00 0.02 0.062 I O | | | | 2.63

25.083 0.00 0.02 0.062 I O | | | | 2.63

25.167 0.00 0.02 0.062 I O | | | | 2.63

25.250 0.00 0.02 0.062 I O | | | | 2.62

25.333 0.00 0.02 0.062 I O | | | | 2.62

25.417 0.00 0.02 0.062 IO | | | | 2.61

25.500 0.00 0.02 0.062 IO | | | | 2.61

25.583 0.00 0.02 0.061 IO | | | | 2.61

25.667 0.00 0.02 0.061 IO | | | | 2.60

25.750 0.00 0.02 0.061 IO | | | | 2.60

25.833 0.00 0.02 0.061 IO | | | | 2.60

25.917 0.00 0.01 0.061 IO | | | | 2.59

26.000 0.00 0.01 0.061 IO | | | | 2.59

26.083 0.00 0.01 0.061 IO | | | | 2.59

26.167 0.00 0.01 0.061 IO | | | | 2.58

26.250 0.00 0.01 0.061 IO | | | | 2.58

26.333 0.00 0.01 0.061 IO | | | | 2.58

26.417 0.00 0.01 0.060 IO | | | | 2.58

26.500 0.00 0.01 0.060 IO | | | | 2.57

26.583 0.00 0.01 0.060 IO | | | | 2.57

26.667 0.00 0.01 0.060 IO | | | | 2.57

26.750 0.00 0.01 0.060 IO | | | | 2.57

26.833 0.00 0.01 0.060 IO | | | | 2.56

26.917 0.00 0.01 0.060 IO | | | | 2.56

27.000 0.00 0.01 0.060 IO | | | | 2.56 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

27.083 0.00 0.01 0.060 IO | | | | 2.56

27.167 0.00 0.01 0.060 O | | | | 2.56

27.250 0.00 0.01 0.060 O | | | | 2.55

27.333 0.00 0.01 0.060 O | | | | 2.55

27.417 0.00 0.01 0.060 O | | | | 2.55

27.500 0.00 0.01 0.060 O | | | | 2.55

27.583 0.00 0.01 0.060 O | | | | 2.55

27.667 0.00 0.01 0.059 O | | | | 2.55

27.750 0.00 0.01 0.059 O | | | | 2.54

27.833 0.00 0.01 0.059 O | | | | 2.54

27.917 0.00 0.01 0.059 O | | | | 2.54

28.000 0.00 0.01 0.059 O | | | | 2.54

28.083 0.00 0.01 0.059 O | | | | 2.54

28.167 0.00 0.01 0.059 O | | | | 2.54

28.250 0.00 0.01 0.059 O | | | | 2.54

28.333 0.00 0.01 0.059 O | | | | 2.54

28.417 0.00 0.01 0.059 O | | | | 2.53

28.500 0.00 0.01 0.059 O | | | | 2.53

28.583 0.00 0.00 0.059 O | | | | 2.53

28.667 0.00 0.00 0.059 O | | | | 2.53

28.750 0.00 0.00 0.059 O | | | | 2.53

28.833 0.00 0.00 0.059 O | | | | 2.53

28.917 0.00 0.00 0.059 O | | | | 2.53

29.000 0.00 0.00 0.059 O | | | | 2.53

29.083 0.00 0.00 0.059 O | | | | 2.53

29.167 0.00 0.00 0.059 O | | | | 2.53

29.250 0.00 0.00 0.059 O | | | | 2.52

29.333 0.00 0.00 0.059 O | | | | 2.52

29.417 0.00 0.00 0.059 O | | | | 2.52

29.500 0.00 0.00 0.059 O | | | | 2.52

29.583 0.00 0.00 0.059 O | | | | 2.52

29.667 0.00 0.00 0.059 O | | | | 2.52

29.750 0.00 0.00 0.059 O | | | | 2.52

29.833 0.00 0.00 0.059 O | | | | 2.52

29.917 0.00 0.00 0.059 O | | | | 2.52

30.000 0.00 0.00 0.059 O | | | | 2.52

30.083 0.00 0.00 0.059 O | | | | 2.52

30.167 0.00 0.00 0.059 O | | | | 2.52

30.250 0.00 0.00 0.059 O | | | | 2.52

30.333 0.00 0.00 0.059 O | | | | 2.52

30.417 0.00 0.00 0.058 O | | | | 2.52

30.500 0.00 0.00 0.058 O | | | | 2.51

30.583 0.00 0.00 0.058 O | | | | 2.51

30.667 0.00 0.00 0.058 O | | | | 2.51

30.750 0.00 0.00 0.058 O | | | | 2.51

30.833 0.00 0.00 0.058 O | | | | 2.51

30.917 0.00 0.00 0.058 O | | | | 2.51

31.000 0.00 0.00 0.058 O | | | | 2.51

31.083 0.00 0.00 0.058 O | | | | 2.51

31.167 0.00 0.00 0.058 O | | | | 2.51

31.250 0.00 0.00 0.058 O | | | | 2.51 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

31.333 0.00 0.00 0.058 O | | | | 2.51

31.417 0.00 0.00 0.058 O | | | | 2.51

31.500 0.00 0.00 0.058 O | | | | 2.51

31.583 0.00 0.00 0.058 O | | | | 2.51

31.667 0.00 0.00 0.058 O | | | | 2.51

31.750 0.00 0.00 0.058 O | | | | 2.51

31.833 0.00 0.00 0.058 O | | | | 2.51

31.917 0.00 0.00 0.058 O | | | | 2.51

32.000 0.00 0.00 0.058 O | | | | 2.51

32.083 0.00 0.00 0.058 O | | | | 2.51

32.167 0.00 0.00 0.058 O | | | | 2.51

32.250 0.00 0.00 0.058 O | | | | 2.51

32.333 0.00 0.00 0.058 O | | | | 2.51

32.417 0.00 0.00 0.058 O | | | | 2.51

32.500 0.00 0.00 0.058 O | | | | 2.51

32.583 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 391
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.164 (CFS)
Total volume = 0.115 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
5-YR 1-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A15.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 19
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 2.737 (CFS)
Total volume = 0.078 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 19
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.7 1.37 2.05 2.74 (Ft.)

0.083 0.04 0.00 0.000 O | | | | 0.01

0.167 0.22 0.00 0.001 O I | | | | 0.06

0.250 0.34 0.00 0.003 O I | | | | 0.18

0.333 0.40 0.00 0.005 O I | | | | 0.34

0.417 0.46 0.00 0.008 O I | | | | 0.53

0.500 0.51 0.00 0.012 O I | | | | 0.71

0.583 0.58 0.00 0.015 O I | | | | 0.92

0.667 0.66 0.00 0.020 O I| | | | 1.13

0.750 0.87 0.00 0.025 O | I | | | 1.37

0.833 1.57 0.00 0.033 O | | I | | 1.70

0.917 2.74 0.00 0.048 O | | | I 2.20

1.000 1.51 0.02 0.063 O | |I | | 2.65

1.083 0.81 0.06 0.071 O |I | | | 2.89

1.167 0.34 0.08 0.074 O I | | | | 3.00

1.250 0.13 0.08 0.075 OI | | | | 3.03

1.333 0.06 0.08 0.075 O | | | | 3.03

1.417 0.03 0.08 0.075 O | | | | 3.03

1.500 0.01 0.08 0.075 O | | | | 3.02 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.00 0.08 0.074 O | | | | 3.00

1.667 0.00 0.08 0.073 O | | | | 2.98

1.750 0.00 0.07 0.073 O | | | | 2.97

1.833 0.00 0.07 0.072 O | | | | 2.95

1.917 0.00 0.07 0.072 O | | | | 2.94

2.000 0.00 0.07 0.072 O | | | | 2.92

2.083 0.00 0.06 0.071 O | | | | 2.91

2.167 0.00 0.06 0.071 O | | | | 2.90

2.250 0.00 0.06 0.070 O | | | | 2.88

2.333 0.00 0.06 0.070 O | | | | 2.87

2.417 0.00 0.06 0.069 O | | | | 2.86

2.500 0.00 0.05 0.069 O | | | | 2.85

2.583 0.00 0.05 0.069 O | | | | 2.83

2.667 0.00 0.05 0.068 O | | | | 2.82

2.750 0.00 0.05 0.068 O | | | | 2.81

2.833 0.00 0.05 0.068 O | | | | 2.80

2.917 0.00 0.05 0.067 O | | | | 2.79

3.000 0.00 0.04 0.067 O | | | | 2.78

3.083 0.00 0.04 0.067 O | | | | 2.77

3.167 0.00 0.04 0.066 O | | | | 2.76

3.250 0.00 0.04 0.066 O | | | | 2.76

3.333 0.00 0.04 0.066 O | | | | 2.75

3.417 0.00 0.04 0.066 O | | | | 2.74

3.500 0.00 0.04 0.065 O | | | | 2.73

3.583 0.00 0.03 0.065 O | | | | 2.72

3.667 0.00 0.03 0.065 O | | | | 2.72

3.750 0.00 0.03 0.065 O | | | | 2.71

3.833 0.00 0.03 0.064 O | | | | 2.70

3.917 0.00 0.03 0.064 O | | | | 2.70

4.000 0.00 0.03 0.064 O | | | | 2.69

4.083 0.00 0.03 0.064 O | | | | 2.68

4.167 0.00 0.03 0.064 O | | | | 2.68

4.250 0.00 0.03 0.063 O | | | | 2.67

4.333 0.00 0.03 0.063 O | | | | 2.67

4.417 0.00 0.02 0.063 O | | | | 2.66

4.500 0.00 0.02 0.063 O | | | | 2.65

4.583 0.00 0.02 0.063 O | | | | 2.65

4.667 0.00 0.02 0.063 O | | | | 2.64

4.750 0.00 0.02 0.062 O | | | | 2.64

4.833 0.00 0.02 0.062 O | | | | 2.64

4.917 0.00 0.02 0.062 O | | | | 2.63

5.000 0.00 0.02 0.062 O | | | | 2.63

5.083 0.00 0.02 0.062 O | | | | 2.62

5.167 0.00 0.02 0.062 O | | | | 2.62

5.250 0.00 0.02 0.062 O | | | | 2.61

5.333 0.00 0.02 0.062 O | | | | 2.61

5.417 0.00 0.02 0.061 O | | | | 2.61

5.500 0.00 0.02 0.061 O | | | | 2.60

5.583 0.00 0.02 0.061 O | | | | 2.60

5.667 0.00 0.02 0.061 O | | | | 2.60

5.750 0.00 0.01 0.061 O | | | | 2.59 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.00 0.01 0.061 O | | | | 2.59

5.917 0.00 0.01 0.061 O | | | | 2.59

6.000 0.00 0.01 0.061 O | | | | 2.58

6.083 0.00 0.01 0.061 O | | | | 2.58

6.167 0.00 0.01 0.061 O | | | | 2.58

6.250 0.00 0.01 0.060 O | | | | 2.58

6.333 0.00 0.01 0.060 O | | | | 2.57

6.417 0.00 0.01 0.060 O | | | | 2.57

6.500 0.00 0.01 0.060 O | | | | 2.57

6.583 0.00 0.01 0.060 O | | | | 2.57

6.667 0.00 0.01 0.060 O | | | | 2.56

6.750 0.00 0.01 0.060 O | | | | 2.56

6.833 0.00 0.01 0.060 O | | | | 2.56

6.917 0.00 0.01 0.060 O | | | | 2.56

7.000 0.00 0.01 0.060 O | | | | 2.56

7.083 0.00 0.01 0.060 O | | | | 2.55

7.167 0.00 0.01 0.060 O | | | | 2.55

7.250 0.00 0.01 0.060 O | | | | 2.55

7.333 0.00 0.01 0.060 O | | | | 2.55

7.417 0.00 0.01 0.060 O | | | | 2.55

7.500 0.00 0.01 0.059 O | | | | 2.55

7.583 0.00 0.01 0.059 O | | | | 2.54

7.667 0.00 0.01 0.059 O | | | | 2.54

7.750 0.00 0.01 0.059 O | | | | 2.54

7.833 0.00 0.01 0.059 O | | | | 2.54

7.917 0.00 0.01 0.059 O | | | | 2.54

8.000 0.00 0.01 0.059 O | | | | 2.54

8.083 0.00 0.01 0.059 O | | | | 2.54

8.167 0.00 0.01 0.059 O | | | | 2.54

8.250 0.00 0.01 0.059 O | | | | 2.53

8.333 0.00 0.01 0.059 O | | | | 2.53

8.417 0.00 0.00 0.059 O | | | | 2.53

8.500 0.00 0.00 0.059 O | | | | 2.53

8.583 0.00 0.00 0.059 O | | | | 2.53

8.667 0.00 0.00 0.059 O | | | | 2.53

8.750 0.00 0.00 0.059 O | | | | 2.53

8.833 0.00 0.00 0.059 O | | | | 2.53

8.917 0.00 0.00 0.059 O | | | | 2.53

9.000 0.00 0.00 0.059 O | | | | 2.53

9.083 0.00 0.00 0.059 O | | | | 2.52

9.167 0.00 0.00 0.059 O | | | | 2.52

9.250 0.00 0.00 0.059 O | | | | 2.52

9.333 0.00 0.00 0.059 O | | | | 2.52

9.417 0.00 0.00 0.059 O | | | | 2.52

9.500 0.00 0.00 0.059 O | | | | 2.52

9.583 0.00 0.00 0.059 O | | | | 2.52

9.667 0.00 0.00 0.059 O | | | | 2.52

9.750 0.00 0.00 0.059 O | | | | 2.52

9.833 0.00 0.00 0.059 O | | | | 2.52

9.917 0.00 0.00 0.059 O | | | | 2.52

10.000 0.00 0.00 0.059 O | | | | 2.52 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.00 0.059 O | | | | 2.52

10.167 0.00 0.00 0.059 O | | | | 2.52

10.250 0.00 0.00 0.058 O | | | | 2.52

10.333 0.00 0.00 0.058 O | | | | 2.51

10.417 0.00 0.00 0.058 O | | | | 2.51

10.500 0.00 0.00 0.058 O | | | | 2.51

10.583 0.00 0.00 0.058 O | | | | 2.51

10.667 0.00 0.00 0.058 O | | | | 2.51

10.750 0.00 0.00 0.058 O | | | | 2.51

10.833 0.00 0.00 0.058 O | | | | 2.51

10.917 0.00 0.00 0.058 O | | | | 2.51

11.000 0.00 0.00 0.058 O | | | | 2.51

11.083 0.00 0.00 0.058 O | | | | 2.51

11.167 0.00 0.00 0.058 O | | | | 2.51

11.250 0.00 0.00 0.058 O | | | | 2.51

11.333 0.00 0.00 0.058 O | | | | 2.51

11.417 0.00 0.00 0.058 O | | | | 2.51

11.500 0.00 0.00 0.058 O | | | | 2.51

11.583 0.00 0.00 0.058 O | | | | 2.51

11.667 0.00 0.00 0.058 O | | | | 2.51

11.750 0.00 0.00 0.058 O | | | | 2.51

11.833 0.00 0.00 0.058 O | | | | 2.51

11.917 0.00 0.00 0.058 O | | | | 2.51

12.000 0.00 0.00 0.058 O | | | | 2.51

12.083 0.00 0.00 0.058 O | | | | 2.51

12.167 0.00 0.00 0.058 O | | | | 2.51

12.250 0.00 0.00 0.058 O | | | | 2.51

12.333 0.00 0.00 0.058 O | | | | 2.51

12.417 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 149
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.082 (CFS)
Total volume = 0.019 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
5-YR 3-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A35.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 43
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 1.305 (CFS)
Total volume = 0.114 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 43
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.3 0.65 0.98 1.31 (Ft.)

0.083 0.02 0.00 0.000 O | | | | 0.00

0.167 0.13 0.00 0.001 O I | | | | 0.04

0.250 0.18 0.00 0.002 O I | | | | 0.11

0.333 0.18 0.00 0.003 O I | | | | 0.18

0.417 0.22 0.00 0.004 O I | | | | 0.27

0.500 0.24 0.00 0.006 O I | | | | 0.37

0.583 0.26 0.00 0.008 O I | | | | 0.48

0.667 0.26 0.00 0.009 O I | | | | 0.58

0.750 0.28 0.00 0.011 O I | | | | 0.68

0.833 0.28 0.00 0.013 O I | | | | 0.79

0.917 0.26 0.00 0.015 O I | | | | 0.89

1.000 0.26 0.00 0.017 O I | | | | 0.99

1.083 0.29 0.00 0.019 O I| | | | 1.08

1.167 0.33 0.00 0.021 O I | | | 1.17

1.250 0.35 0.00 0.023 O I | | | 1.28

1.333 0.35 0.00 0.026 O I | | | 1.39

1.417 0.35 0.00 0.028 O I | | | 1.50

1.500 0.39 0.00 0.030 O |I | | | 1.59 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.41 0.00 0.033 O | I | | | 1.69

1.667 0.41 0.00 0.036 O |I | | | 1.79

1.750 0.44 0.00 0.039 O | I | | | 1.89

1.833 0.49 0.00 0.042 O | I | | | 2.01

1.917 0.49 0.00 0.046 O | I | | | 2.11

2.000 0.48 0.00 0.049 O | I | | | 2.22

2.083 0.49 0.00 0.052 O | I | | | 2.32

2.167 0.52 0.00 0.056 O | I | | | 2.43

2.250 0.63 0.01 0.060 O | I| | | 2.55

2.333 0.71 0.03 0.064 O | |I | | 2.69

2.417 0.69 0.05 0.069 |O | I | | 2.83

2.500 0.98 0.08 0.074 |O | | I | 3.00

2.583 1.18 0.10 0.081 | O | | | I | 3.20

2.667 1.31 0.13 0.089 | O | | | I| 3.43

2.750 1.04 0.15 0.096 | O | | |I | 3.64

2.833 0.61 0.16 0.100 | O | I| | | 3.77

2.917 0.42 0.17 0.103 | O | I | | | 3.84

3.000 0.33 0.17 0.104 | O I | | | 3.88

3.083 0.18 0.17 0.105 | O | | | | 3.90

3.167 0.08 0.17 0.104 |I O | | | | 3.89

3.250 0.03 0.17 0.103 I O | | | | 3.87

3.333 0.01 0.17 0.102 I O | | | | 3.84

3.417 0.00 0.17 0.101 I O | | | | 3.81

3.500 0.00 0.16 0.100 I O | | | | 3.77

3.583 0.00 0.16 0.099 I O | | | | 3.74

3.667 0.00 0.16 0.098 I O | | | | 3.71

3.750 0.00 0.15 0.097 I O | | | | 3.68

3.833 0.00 0.15 0.096 I O | | | | 3.65

3.917 0.00 0.15 0.095 I O | | | | 3.61

4.000 0.00 0.15 0.094 I O | | | | 3.58

4.083 0.00 0.14 0.093 I O | | | | 3.56

4.167 0.00 0.14 0.092 I O | | | | 3.53

4.250 0.00 0.14 0.091 I O | | | | 3.50

4.333 0.00 0.14 0.090 I O | | | | 3.47

4.417 0.00 0.13 0.089 I O | | | | 3.44

4.500 0.00 0.13 0.088 I O | | | | 3.42

4.583 0.00 0.13 0.087 I O | | | | 3.39

4.667 0.00 0.12 0.086 I O | | | | 3.36

4.750 0.00 0.12 0.086 I O | | | | 3.34

4.833 0.00 0.12 0.085 I O | | | | 3.32

4.917 0.00 0.11 0.084 I O | | | | 3.29

5.000 0.00 0.11 0.083 I O | | | | 3.27

5.083 0.00 0.11 0.082 I O | | | | 3.25

5.167 0.00 0.11 0.082 I O | | | | 3.23

5.250 0.00 0.10 0.081 I O | | | | 3.20

5.333 0.00 0.10 0.080 I O | | | | 3.18

5.417 0.00 0.10 0.080 I O | | | | 3.16

5.500 0.00 0.10 0.079 I O | | | | 3.14

5.583 0.00 0.09 0.078 I O | | | | 3.12

5.667 0.00 0.09 0.078 I O | | | | 3.11

5.750 0.00 0.09 0.077 I O | | | | 3.09 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.00 0.09 0.076 I O | | | | 3.07

5.917 0.00 0.08 0.076 I O | | | | 3.05

6.000 0.00 0.08 0.075 I O | | | | 3.04

6.083 0.00 0.08 0.075 IO | | | | 3.02

6.167 0.00 0.08 0.074 IO | | | | 3.00

6.250 0.00 0.08 0.074 IO | | | | 2.99

6.333 0.00 0.07 0.073 IO | | | | 2.97

6.417 0.00 0.07 0.073 IO | | | | 2.96

6.500 0.00 0.07 0.072 IO | | | | 2.94

6.583 0.00 0.07 0.072 IO | | | | 2.93

6.667 0.00 0.06 0.071 IO | | | | 2.91

6.750 0.00 0.06 0.071 IO | | | | 2.90

6.833 0.00 0.06 0.070 IO | | | | 2.88

6.917 0.00 0.06 0.070 IO | | | | 2.87

7.000 0.00 0.06 0.070 IO | | | | 2.86

7.083 0.00 0.05 0.069 IO | | | | 2.85

7.167 0.00 0.05 0.069 IO | | | | 2.84

7.250 0.00 0.05 0.068 IO | | | | 2.83

7.333 0.00 0.05 0.068 IO | | | | 2.81

7.417 0.00 0.05 0.068 IO | | | | 2.80

7.500 0.00 0.05 0.067 IO | | | | 2.79

7.583 0.00 0.04 0.067 IO | | | | 2.78

7.667 0.00 0.04 0.067 IO | | | | 2.78

7.750 0.00 0.04 0.067 IO | | | | 2.77

7.833 0.00 0.04 0.066 O | | | | 2.76

7.917 0.00 0.04 0.066 O | | | | 2.75

8.000 0.00 0.04 0.066 O | | | | 2.74

8.083 0.00 0.04 0.065 O | | | | 2.73

8.167 0.00 0.04 0.065 O | | | | 2.72

8.250 0.00 0.03 0.065 O | | | | 2.72

8.333 0.00 0.03 0.065 O | | | | 2.71

8.417 0.00 0.03 0.065 O | | | | 2.70

8.500 0.00 0.03 0.064 O | | | | 2.70

8.583 0.00 0.03 0.064 O | | | | 2.69

8.667 0.00 0.03 0.064 O | | | | 2.68

8.750 0.00 0.03 0.064 O | | | | 2.68

8.833 0.00 0.03 0.064 O | | | | 2.67

8.917 0.00 0.03 0.063 O | | | | 2.67

9.000 0.00 0.03 0.063 O | | | | 2.66

9.083 0.00 0.02 0.063 O | | | | 2.66

9.167 0.00 0.02 0.063 O | | | | 2.65

9.250 0.00 0.02 0.063 O | | | | 2.65

9.333 0.00 0.02 0.062 O | | | | 2.64

9.417 0.00 0.02 0.062 O | | | | 2.64

9.500 0.00 0.02 0.062 O | | | | 2.63

9.583 0.00 0.02 0.062 O | | | | 2.63

9.667 0.00 0.02 0.062 O | | | | 2.62

9.750 0.00 0.02 0.062 O | | | | 2.62

9.833 0.00 0.02 0.062 O | | | | 2.61

9.917 0.00 0.02 0.062 O | | | | 2.61

10.000 0.00 0.02 0.061 O | | | | 2.61 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.02 0.061 O | | | | 2.60

10.167 0.00 0.02 0.061 O | | | | 2.60

10.250 0.00 0.02 0.061 O | | | | 2.60

10.333 0.00 0.01 0.061 O | | | | 2.59

10.417 0.00 0.01 0.061 O | | | | 2.59

10.500 0.00 0.01 0.061 O | | | | 2.59

10.583 0.00 0.01 0.061 O | | | | 2.58

10.667 0.00 0.01 0.061 O | | | | 2.58

10.750 0.00 0.01 0.061 O | | | | 2.58

10.833 0.00 0.01 0.060 O | | | | 2.58

10.917 0.00 0.01 0.060 O | | | | 2.57

11.000 0.00 0.01 0.060 O | | | | 2.57

11.083 0.00 0.01 0.060 O | | | | 2.57

11.167 0.00 0.01 0.060 O | | | | 2.57

11.250 0.00 0.01 0.060 O | | | | 2.56

11.333 0.00 0.01 0.060 O | | | | 2.56

11.417 0.00 0.01 0.060 O | | | | 2.56

11.500 0.00 0.01 0.060 O | | | | 2.56

11.583 0.00 0.01 0.060 O | | | | 2.56

11.667 0.00 0.01 0.060 O | | | | 2.55

11.750 0.00 0.01 0.060 O | | | | 2.55

11.833 0.00 0.01 0.060 O | | | | 2.55

11.917 0.00 0.01 0.060 O | | | | 2.55

12.000 0.00 0.01 0.060 O | | | | 2.55

12.083 0.00 0.01 0.059 O | | | | 2.55

12.167 0.00 0.01 0.059 O | | | | 2.54

12.250 0.00 0.01 0.059 O | | | | 2.54

12.333 0.00 0.01 0.059 O | | | | 2.54

12.417 0.00 0.01 0.059 O | | | | 2.54

12.500 0.00 0.01 0.059 O | | | | 2.54

12.583 0.00 0.01 0.059 O | | | | 2.54

12.667 0.00 0.01 0.059 O | | | | 2.54

12.750 0.00 0.01 0.059 O | | | | 2.54

12.833 0.00 0.01 0.059 O | | | | 2.53

12.917 0.00 0.01 0.059 O | | | | 2.53

13.000 0.00 0.01 0.059 O | | | | 2.53

13.083 0.00 0.00 0.059 O | | | | 2.53

13.167 0.00 0.00 0.059 O | | | | 2.53

13.250 0.00 0.00 0.059 O | | | | 2.53

13.333 0.00 0.00 0.059 O | | | | 2.53

13.417 0.00 0.00 0.059 O | | | | 2.53

13.500 0.00 0.00 0.059 O | | | | 2.53

13.583 0.00 0.00 0.059 O | | | | 2.53

13.667 0.00 0.00 0.059 O | | | | 2.52

13.750 0.00 0.00 0.059 O | | | | 2.52

13.833 0.00 0.00 0.059 O | | | | 2.52

13.917 0.00 0.00 0.059 O | | | | 2.52

14.000 0.00 0.00 0.059 O | | | | 2.52

14.083 0.00 0.00 0.059 O | | | | 2.52

14.167 0.00 0.00 0.059 O | | | | 2.52

14.250 0.00 0.00 0.059 O | | | | 2.52 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.00 0.00 0.059 O | | | | 2.52

14.417 0.00 0.00 0.059 O | | | | 2.52

14.500 0.00 0.00 0.059 O | | | | 2.52

14.583 0.00 0.00 0.059 O | | | | 2.52

14.667 0.00 0.00 0.059 O | | | | 2.52

14.750 0.00 0.00 0.059 O | | | | 2.52

14.833 0.00 0.00 0.058 O | | | | 2.52

14.917 0.00 0.00 0.058 O | | | | 2.51

15.000 0.00 0.00 0.058 O | | | | 2.51

15.083 0.00 0.00 0.058 O | | | | 2.51

15.167 0.00 0.00 0.058 O | | | | 2.51

15.250 0.00 0.00 0.058 O | | | | 2.51

15.333 0.00 0.00 0.058 O | | | | 2.51

15.417 0.00 0.00 0.058 O | | | | 2.51

15.500 0.00 0.00 0.058 O | | | | 2.51

15.583 0.00 0.00 0.058 O | | | | 2.51

15.667 0.00 0.00 0.058 O | | | | 2.51

15.750 0.00 0.00 0.058 O | | | | 2.51

15.833 0.00 0.00 0.058 O | | | | 2.51

15.917 0.00 0.00 0.058 O | | | | 2.51

16.000 0.00 0.00 0.058 O | | | | 2.51

16.083 0.00 0.00 0.058 O | | | | 2.51

16.167 0.00 0.00 0.058 O | | | | 2.51

16.250 0.00 0.00 0.058 O | | | | 2.51

16.333 0.00 0.00 0.058 O | | | | 2.51

16.417 0.00 0.00 0.058 O | | | | 2.51

16.500 0.00 0.00 0.058 O | | | | 2.51

16.583 0.00 0.00 0.058 O | | | | 2.51

16.667 0.00 0.00 0.058 O | | | | 2.51

16.750 0.00 0.00 0.058 O | | | | 2.51

16.833 0.00 0.00 0.058 O | | | | 2.51

16.917 0.00 0.00 0.058 O | | | | 2.51

17.000 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 204
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.174 (CFS)
Total volume = 0.056 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
5-YR 6-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A65.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 79
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 1.061 (CFS)
Total volume = 0.147 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 79
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.3 0.53 0.80 1.06 (Ft.)

0.083 0.01 0.00 0.000 O | | | | 0.00

0.167 0.07 0.00 0.000 O I | | | | 0.02

0.250 0.10 0.00 0.001 O I | | | | 0.06

0.333 0.12 0.00 0.002 O I | | | | 0.10

0.417 0.12 0.00 0.002 O I | | | | 0.16

0.500 0.13 0.00 0.003 O I | | | | 0.21

0.583 0.14 0.00 0.004 O I | | | | 0.27

0.667 0.15 0.00 0.005 O I | | | | 0.33

0.750 0.15 0.00 0.006 O I | | | | 0.39

0.833 0.15 0.00 0.007 O I | | | | 0.45

0.917 0.15 0.00 0.008 O I | | | | 0.52

1.000 0.15 0.00 0.009 O I | | | | 0.57

1.083 0.16 0.00 0.010 O I | | | | 0.63

1.167 0.17 0.00 0.012 O I | | | | 0.69

1.250 0.17 0.00 0.013 O I | | | | 0.76

1.333 0.17 0.00 0.014 O I | | | | 0.82

1.417 0.17 0.00 0.015 O I | | | | 0.89

1.500 0.17 0.00 0.016 O I | | | | 0.95 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.17 0.00 0.017 O I | | | | 1.01

1.667 0.17 0.00 0.018 O I | | | | 1.07

1.750 0.17 0.00 0.020 O I | | | | 1.12

1.833 0.17 0.00 0.021 O I | | | | 1.17

1.917 0.17 0.00 0.022 O I | | | | 1.23

2.000 0.17 0.00 0.023 O I | | | | 1.28

2.083 0.18 0.00 0.024 O I | | | | 1.33

2.167 0.18 0.00 0.026 O I | | | | 1.39

2.250 0.19 0.00 0.027 O I | | | | 1.45

2.333 0.19 0.00 0.028 O I | | | | 1.50

2.417 0.19 0.00 0.029 O I | | | | 1.55

2.500 0.19 0.00 0.031 O I | | | | 1.60

2.583 0.19 0.00 0.032 O I | | | | 1.64

2.667 0.19 0.00 0.033 O I | | | | 1.69

2.750 0.19 0.00 0.035 O I | | | | 1.74

2.833 0.20 0.00 0.036 O I | | | | 1.79

2.917 0.21 0.00 0.037 O I | | | | 1.84

3.000 0.21 0.00 0.039 O I | | | | 1.89

3.083 0.21 0.00 0.040 O I | | | | 1.94

3.167 0.21 0.00 0.042 O I | | | | 1.99

3.250 0.23 0.00 0.043 O I | | | | 2.04

3.333 0.23 0.00 0.045 O I | | | | 2.09

3.417 0.23 0.00 0.047 O I| | | | 2.14

3.500 0.25 0.00 0.048 O I| | | | 2.19

3.583 0.27 0.00 0.050 O I | | | 2.25

3.667 0.28 0.00 0.052 O I | | | 2.31

3.750 0.29 0.00 0.054 O I | | | 2.37

3.833 0.31 0.00 0.056 O |I | | | 2.44

3.917 0.32 0.00 0.058 O |I | | | 2.50

4.000 0.33 0.01 0.060 O |I | | | 2.57

4.083 0.34 0.02 0.062 O | I | | | 2.64

4.167 0.35 0.03 0.065 O | I | | | 2.71

4.250 0.37 0.04 0.067 |O | I | | | 2.78

4.333 0.39 0.05 0.069 |O | I | | | 2.85

4.417 0.41 0.07 0.072 |O | I | | | 2.92

4.500 0.43 0.08 0.074 | O | I | | | 3.00

4.583 0.44 0.09 0.076 | O | I | | | 3.07

4.667 0.46 0.10 0.079 | O | I | | | 3.14

4.750 0.48 0.11 0.081 | O | I | | | 3.22

4.833 0.50 0.11 0.084 | O | I | | | 3.30

4.917 0.51 0.12 0.087 | O | I| | | 3.37

5.000 0.52 0.13 0.089 | O | I| | | 3.45

5.083 0.55 0.14 0.092 | O | I | | 3.53

5.167 0.63 0.15 0.095 | O | | I | | 3.62

5.250 0.71 0.16 0.099 | O | | I | | 3.73

5.333 0.79 0.17 0.103 | O | | I| | 3.85

5.417 0.86 0.18 0.107 | O | | |I | 3.98

5.500 0.97 0.19 0.112 | O | | | I | 4.12

5.583 1.06 0.20 0.118 | O | | | I 4.28

5.667 0.65 0.21 0.122 | O | | I | | 4.40

5.750 0.37 0.21 0.124 | O | I | | | 4.46 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.23 0.21 0.125 | O | | | | 4.47

5.917 0.15 0.21 0.125 | I O | | | | 4.47

6.000 0.10 0.21 0.124 | I O | | | | 4.45

6.083 0.06 0.21 0.123 |I O | | | | 4.43

6.167 0.02 0.21 0.122 I O | | | | 4.40

6.250 0.01 0.21 0.121 I O | | | | 4.36

6.333 0.00 0.20 0.120 I O | | | | 4.32

6.417 0.00 0.20 0.118 I O | | | | 4.28

6.500 0.00 0.20 0.117 I O | | | | 4.24

6.583 0.00 0.20 0.115 I O | | | | 4.21

6.667 0.00 0.19 0.114 I O | | | | 4.17

6.750 0.00 0.19 0.113 I O | | | | 4.13

6.833 0.00 0.19 0.111 I O | | | | 4.10

6.917 0.00 0.19 0.110 I O | | | | 4.06

7.000 0.00 0.18 0.109 I O | | | | 4.03

7.083 0.00 0.18 0.108 I O | | | | 3.99

7.167 0.00 0.18 0.106 I O | | | | 3.95

7.250 0.00 0.18 0.105 I O | | | | 3.92

7.333 0.00 0.17 0.104 I O | | | | 3.88

7.417 0.00 0.17 0.103 I O | | | | 3.85

7.500 0.00 0.17 0.102 I O | | | | 3.81

7.583 0.00 0.16 0.101 I O | | | | 3.78

7.667 0.00 0.16 0.099 I O | | | | 3.75

7.750 0.00 0.16 0.098 I O | | | | 3.72

7.833 0.00 0.16 0.097 I O | | | | 3.68

7.917 0.00 0.15 0.096 I O | | | | 3.65

8.000 0.00 0.15 0.095 I O | | | | 3.62

8.083 0.00 0.15 0.094 I O | | | | 3.59

8.167 0.00 0.15 0.093 I O | | | | 3.56

8.250 0.00 0.14 0.092 I O | | | | 3.53

8.333 0.00 0.14 0.091 I O | | | | 3.50

8.417 0.00 0.14 0.090 I O | | | | 3.48

8.500 0.00 0.13 0.089 I O | | | | 3.45

8.583 0.00 0.13 0.088 I O | | | | 3.42

8.667 0.00 0.13 0.087 I O | | | | 3.40

8.750 0.00 0.12 0.087 I O | | | | 3.37

8.833 0.00 0.12 0.086 I O | | | | 3.35

8.917 0.00 0.12 0.085 I O | | | | 3.32

9.000 0.00 0.11 0.084 I O | | | | 3.30

9.083 0.00 0.11 0.083 I O | | | | 3.27

9.167 0.00 0.11 0.083 I O | | | | 3.25

9.250 0.00 0.11 0.082 I O | | | | 3.23

9.333 0.00 0.10 0.081 I O | | | | 3.21

9.417 0.00 0.10 0.080 I O | | | | 3.19

9.500 0.00 0.10 0.080 I O | | | | 3.17

9.583 0.00 0.10 0.079 I O | | | | 3.15

9.667 0.00 0.09 0.078 I O | | | | 3.13

9.750 0.00 0.09 0.078 I O | | | | 3.11

9.833 0.00 0.09 0.077 I O | | | | 3.09

9.917 0.00 0.09 0.077 I O | | | | 3.07

10.000 0.00 0.09 0.076 I O | | | | 3.06 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.08 0.075 I O | | | | 3.04

10.167 0.00 0.08 0.075 I O | | | | 3.02

10.250 0.00 0.08 0.074 I O | | | | 3.01

10.333 0.00 0.08 0.074 I O | | | | 2.99

10.417 0.00 0.07 0.073 I O | | | | 2.97

10.500 0.00 0.07 0.073 I O | | | | 2.96

10.583 0.00 0.07 0.072 I O | | | | 2.94

10.667 0.00 0.07 0.072 I O | | | | 2.93

10.750 0.00 0.06 0.071 IO | | | | 2.91

10.833 0.00 0.06 0.071 IO | | | | 2.90

10.917 0.00 0.06 0.070 IO | | | | 2.89

11.000 0.00 0.06 0.070 IO | | | | 2.88

11.083 0.00 0.06 0.070 IO | | | | 2.86

11.167 0.00 0.05 0.069 IO | | | | 2.85

11.250 0.00 0.05 0.069 IO | | | | 2.84

11.333 0.00 0.05 0.068 IO | | | | 2.83

11.417 0.00 0.05 0.068 IO | | | | 2.82

11.500 0.00 0.05 0.068 IO | | | | 2.81

11.583 0.00 0.05 0.067 IO | | | | 2.80

11.667 0.00 0.04 0.067 IO | | | | 2.79

11.750 0.00 0.04 0.067 IO | | | | 2.78

11.833 0.00 0.04 0.067 IO | | | | 2.77

11.917 0.00 0.04 0.066 IO | | | | 2.76

12.000 0.00 0.04 0.066 IO | | | | 2.75

12.083 0.00 0.04 0.066 IO | | | | 2.74

12.167 0.00 0.04 0.066 IO | | | | 2.73

12.250 0.00 0.04 0.065 IO | | | | 2.73

12.333 0.00 0.03 0.065 IO | | | | 2.72

12.417 0.00 0.03 0.065 O | | | | 2.71

12.500 0.00 0.03 0.065 O | | | | 2.70

12.583 0.00 0.03 0.064 O | | | | 2.70

12.667 0.00 0.03 0.064 O | | | | 2.69

12.750 0.00 0.03 0.064 O | | | | 2.69

12.833 0.00 0.03 0.064 O | | | | 2.68

12.917 0.00 0.03 0.064 O | | | | 2.67

13.000 0.00 0.03 0.063 O | | | | 2.67

13.083 0.00 0.03 0.063 O | | | | 2.66

13.167 0.00 0.02 0.063 O | | | | 2.66

13.250 0.00 0.02 0.063 O | | | | 2.65

13.333 0.00 0.02 0.063 O | | | | 2.65

13.417 0.00 0.02 0.063 O | | | | 2.64

13.500 0.00 0.02 0.062 O | | | | 2.64

13.583 0.00 0.02 0.062 O | | | | 2.63

13.667 0.00 0.02 0.062 O | | | | 2.63

13.750 0.00 0.02 0.062 O | | | | 2.62

13.833 0.00 0.02 0.062 O | | | | 2.62

13.917 0.00 0.02 0.062 O | | | | 2.62

14.000 0.00 0.02 0.062 O | | | | 2.61

14.083 0.00 0.02 0.061 O | | | | 2.61

14.167 0.00 0.02 0.061 O | | | | 2.60

14.250 0.00 0.02 0.061 O | | | | 2.60 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.00 0.02 0.061 O | | | | 2.60

14.417 0.00 0.01 0.061 O | | | | 2.59

14.500 0.00 0.01 0.061 O | | | | 2.59

14.583 0.00 0.01 0.061 O | | | | 2.59

14.667 0.00 0.01 0.061 O | | | | 2.59

14.750 0.00 0.01 0.061 O | | | | 2.58

14.833 0.00 0.01 0.061 O | | | | 2.58

14.917 0.00 0.01 0.060 O | | | | 2.58

15.000 0.00 0.01 0.060 O | | | | 2.57

15.083 0.00 0.01 0.060 O | | | | 2.57

15.167 0.00 0.01 0.060 O | | | | 2.57

15.250 0.00 0.01 0.060 O | | | | 2.57

15.333 0.00 0.01 0.060 O | | | | 2.57

15.417 0.00 0.01 0.060 O | | | | 2.56

15.500 0.00 0.01 0.060 O | | | | 2.56

15.583 0.00 0.01 0.060 O | | | | 2.56

15.667 0.00 0.01 0.060 O | | | | 2.56

15.750 0.00 0.01 0.060 O | | | | 2.56

15.833 0.00 0.01 0.060 O | | | | 2.55

15.917 0.00 0.01 0.060 O | | | | 2.55

16.000 0.00 0.01 0.060 O | | | | 2.55

16.083 0.00 0.01 0.060 O | | | | 2.55

16.167 0.00 0.01 0.059 O | | | | 2.55

16.250 0.00 0.01 0.059 O | | | | 2.55

16.333 0.00 0.01 0.059 O | | | | 2.54

16.417 0.00 0.01 0.059 O | | | | 2.54

16.500 0.00 0.01 0.059 O | | | | 2.54

16.583 0.00 0.01 0.059 O | | | | 2.54

16.667 0.00 0.01 0.059 O | | | | 2.54

16.750 0.00 0.01 0.059 O | | | | 2.54

16.833 0.00 0.01 0.059 O | | | | 2.54

16.917 0.00 0.01 0.059 O | | | | 2.53

17.000 0.00 0.01 0.059 O | | | | 2.53

17.083 0.00 0.01 0.059 O | | | | 2.53

17.167 0.00 0.00 0.059 O | | | | 2.53

17.250 0.00 0.00 0.059 O | | | | 2.53

17.333 0.00 0.00 0.059 O | | | | 2.53

17.417 0.00 0.00 0.059 O | | | | 2.53

17.500 0.00 0.00 0.059 O | | | | 2.53

17.583 0.00 0.00 0.059 O | | | | 2.53

17.667 0.00 0.00 0.059 O | | | | 2.53

17.750 0.00 0.00 0.059 O | | | | 2.52

17.833 0.00 0.00 0.059 O | | | | 2.52

17.917 0.00 0.00 0.059 O | | | | 2.52

18.000 0.00 0.00 0.059 O | | | | 2.52

18.083 0.00 0.00 0.059 O | | | | 2.52

18.167 0.00 0.00 0.059 O | | | | 2.52

18.250 0.00 0.00 0.059 O | | | | 2.52

18.333 0.00 0.00 0.059 O | | | | 2.52

18.417 0.00 0.00 0.059 O | | | | 2.52

18.500 0.00 0.00 0.059 O | | | | 2.52 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

18.583 0.00 0.00 0.059 O | | | | 2.52

18.667 0.00 0.00 0.059 O | | | | 2.52

18.750 0.00 0.00 0.059 O | | | | 2.52

18.833 0.00 0.00 0.059 O | | | | 2.52

18.917 0.00 0.00 0.058 O | | | | 2.52

19.000 0.00 0.00 0.058 O | | | | 2.51

19.083 0.00 0.00 0.058 O | | | | 2.51

19.167 0.00 0.00 0.058 O | | | | 2.51

19.250 0.00 0.00 0.058 O | | | | 2.51

19.333 0.00 0.00 0.058 O | | | | 2.51

19.417 0.00 0.00 0.058 O | | | | 2.51

19.500 0.00 0.00 0.058 O | | | | 2.51

19.583 0.00 0.00 0.058 O | | | | 2.51

19.667 0.00 0.00 0.058 O | | | | 2.51

19.750 0.00 0.00 0.058 O | | | | 2.51

19.833 0.00 0.00 0.058 O | | | | 2.51

19.917 0.00 0.00 0.058 O | | | | 2.51

20.000 0.00 0.00 0.058 O | | | | 2.51

20.083 0.00 0.00 0.058 O | | | | 2.51

20.167 0.00 0.00 0.058 O | | | | 2.51

20.250 0.00 0.00 0.058 O | | | | 2.51

20.333 0.00 0.00 0.058 O | | | | 2.51

20.417 0.00 0.00 0.058 O | | | | 2.51

20.500 0.00 0.00 0.058 O | | | | 2.51

20.583 0.00 0.00 0.058 O | | | | 2.51

20.667 0.00 0.00 0.058 O | | | | 2.51

20.750 0.00 0.00 0.058 O | | | | 2.51

20.833 0.00 0.00 0.058 O | | | | 2.51

20.917 0.00 0.00 0.058 O | | | | 2.51

21.000 0.00 0.00 0.058 O | | | | 2.51

21.083 0.00 0.00 0.058 O | | | | 2.51

21.167 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 254
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.214 (CFS)
Total volume = 0.089 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
5-YR 24-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A245.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 295
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.384 (CFS)
Total volume = 0.234 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 295
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.1 0.19 0.29 0.38 (Ft.)

0.083 0.00 0.00 0.000 O | | | | 0.00

0.167 0.01 0.00 0.000 OI | | | | 0.00

0.250 0.02 0.00 0.000 OI | | | | 0.01

0.333 0.02 0.00 0.000 OI | | | | 0.02

0.417 0.03 0.00 0.001 O I | | | | 0.03

0.500 0.03 0.00 0.001 O I | | | | 0.04

0.583 0.03 0.00 0.001 O I | | | | 0.06

0.667 0.03 0.00 0.001 O I | | | | 0.07

0.750 0.03 0.00 0.001 O I | | | | 0.09

0.833 0.04 0.00 0.002 O I | | | | 0.10

0.917 0.04 0.00 0.002 O I | | | | 0.12

1.000 0.04 0.00 0.002 O I | | | | 0.14

1.083 0.04 0.00 0.002 O I | | | | 0.16

1.167 0.04 0.00 0.003 O I | | | | 0.17

1.250 0.04 0.00 0.003 O I | | | | 0.19

1.333 0.03 0.00 0.003 O I | | | | 0.20

1.417 0.03 0.00 0.003 O I | | | | 0.22

1.500 0.03 0.00 0.004 O I | | | | 0.23 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.03 0.00 0.004 O I | | | | 0.25

1.667 0.03 0.00 0.004 O I | | | | 0.26

1.750 0.03 0.00 0.004 O I | | | | 0.28

1.833 0.04 0.00 0.005 O I | | | | 0.29

1.917 0.04 0.00 0.005 O I | | | | 0.31

2.000 0.04 0.00 0.005 O I | | | | 0.32

2.083 0.04 0.00 0.005 O I | | | | 0.34

2.167 0.05 0.00 0.006 O I | | | | 0.36

2.250 0.05 0.00 0.006 O I | | | | 0.38

2.333 0.05 0.00 0.006 O I | | | | 0.40

2.417 0.05 0.00 0.007 O I | | | | 0.42

2.500 0.05 0.00 0.007 O I | | | | 0.44

2.583 0.05 0.00 0.007 O I | | | | 0.46

2.667 0.05 0.00 0.008 O I | | | | 0.48

2.750 0.05 0.00 0.008 O I | | | | 0.50

2.833 0.06 0.00 0.008 O I | | | | 0.52

2.917 0.06 0.00 0.009 O I | | | | 0.54

3.000 0.06 0.00 0.009 O I | | | | 0.56

3.083 0.06 0.00 0.010 O I | | | | 0.59

3.167 0.06 0.00 0.010 O I | | | | 0.61

3.250 0.06 0.00 0.010 O I | | | | 0.63

3.333 0.06 0.00 0.011 O I | | | | 0.65

3.417 0.06 0.00 0.011 O I | | | | 0.67

3.500 0.06 0.00 0.011 O I | | | | 0.69

3.583 0.06 0.00 0.012 O I | | | | 0.71

3.667 0.06 0.00 0.012 O I | | | | 0.73

3.750 0.06 0.00 0.013 O I | | | | 0.76

3.833 0.06 0.00 0.013 O I | | | | 0.78

3.917 0.06 0.00 0.013 O I | | | | 0.80

4.000 0.07 0.00 0.014 O I | | | | 0.82

4.083 0.07 0.00 0.014 O I | | | | 0.85

4.167 0.07 0.00 0.015 O I | | | | 0.88

4.250 0.07 0.00 0.015 O I | | | | 0.90

4.333 0.07 0.00 0.016 O I | | | | 0.93

4.417 0.08 0.00 0.016 O I | | | | 0.95

4.500 0.08 0.00 0.017 O I | | | | 0.98

4.583 0.08 0.00 0.017 O I | | | | 1.01

4.667 0.08 0.00 0.018 O I | | | | 1.03

4.750 0.08 0.00 0.018 O I | | | | 1.06

4.833 0.08 0.00 0.019 O I | | | | 1.08

4.917 0.09 0.00 0.019 O I| | | | 1.11

5.000 0.09 0.00 0.020 O I| | | | 1.14

5.083 0.09 0.00 0.021 O I| | | | 1.16

5.167 0.08 0.00 0.021 O I | | | | 1.19

5.250 0.07 0.00 0.022 O I | | | | 1.21

5.333 0.07 0.00 0.022 O I | | | | 1.23

5.417 0.08 0.00 0.023 O I | | | | 1.26

5.500 0.08 0.00 0.023 O I | | | | 1.28

5.583 0.08 0.00 0.024 O I | | | | 1.31

5.667 0.09 0.00 0.024 O I| | | | 1.33

5.750 0.09 0.00 0.025 O I| | | | 1.36 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.09 0.00 0.026 O I| | | | 1.39

5.917 0.09 0.00 0.026 O I| | | | 1.41

6.000 0.09 0.00 0.027 O I| | | | 1.44

6.083 0.09 0.00 0.027 O I| | | | 1.47

6.167 0.10 0.00 0.028 O I | | | 1.50

6.250 0.10 0.00 0.029 O I | | | 1.53

6.333 0.10 0.00 0.029 O I | | | 1.55

6.417 0.10 0.00 0.030 O I | | | 1.57

6.500 0.10 0.00 0.031 O I | | | 1.60

6.583 0.10 0.00 0.032 O I | | | 1.63

6.667 0.11 0.00 0.032 O |I | | | 1.65

6.750 0.11 0.00 0.033 O |I | | | 1.68

6.833 0.11 0.00 0.034 O |I | | | 1.71

6.917 0.11 0.00 0.035 O |I | | | 1.73

7.000 0.11 0.00 0.035 O |I | | | 1.76

7.083 0.11 0.00 0.036 O |I | | | 1.79

7.167 0.11 0.00 0.037 O |I | | | 1.82

7.250 0.11 0.00 0.038 O |I | | | 1.85

7.333 0.11 0.00 0.038 O |I | | | 1.87

7.417 0.12 0.00 0.039 O | I | | | 1.90

7.500 0.12 0.00 0.040 O | I | | | 1.93

7.583 0.13 0.00 0.041 O | I | | | 1.96

7.667 0.13 0.00 0.042 O | I | | | 1.99

7.750 0.13 0.00 0.043 O | I | | | 2.02

7.833 0.14 0.00 0.044 O | I | | | 2.05

7.917 0.14 0.00 0.045 O | I | | | 2.08

8.000 0.15 0.00 0.046 O | I | | | 2.11

8.083 0.15 0.00 0.047 O | I | | | 2.15

8.167 0.16 0.00 0.048 O | I | | | 2.18

8.250 0.17 0.00 0.049 O | I | | | 2.21

8.333 0.17 0.00 0.050 O | I | | | 2.25

8.417 0.17 0.00 0.051 O | I | | | 2.29

8.500 0.17 0.00 0.052 O | I | | | 2.32

8.583 0.17 0.00 0.053 O | I | | | 2.36

8.667 0.18 0.00 0.055 O | I | | | 2.40

8.750 0.18 0.00 0.056 O | I | | | 2.43

8.833 0.18 0.00 0.057 O | I| | | 2.47

8.917 0.19 0.00 0.058 O | I| | | 2.51

9.000 0.19 0.01 0.060 O | I| | | 2.55

9.083 0.19 0.01 0.061 |O | I | | 2.59

9.167 0.21 0.02 0.062 |O | |I | | 2.63

9.250 0.21 0.03 0.063 | O | |I | | 2.67

9.333 0.21 0.03 0.065 | O | |I | | 2.71

9.417 0.22 0.04 0.066 | O | | I | | 2.75

9.500 0.22 0.05 0.067 | O | | I | | 2.79

9.583 0.23 0.05 0.068 | O | | I | | 2.83

9.667 0.23 0.06 0.070 | O | | I | | 2.87

9.750 0.24 0.06 0.071 | O | | I | | 2.90

9.833 0.24 0.07 0.072 | O | | I | | 2.94

9.917 0.24 0.07 0.073 | O | | I | | 2.98

10.000 0.25 0.08 0.074 | O | | I | | 3.01 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.24 0.08 0.076 | O | | I | | 3.04

10.167 0.20 0.09 0.076 | O| I | | 3.07

10.250 0.18 0.09 0.077 | O| I| | | 3.09

10.333 0.17 0.09 0.078 | O| I | | | 3.11

10.417 0.17 0.09 0.078 | O| I | | | 3.13

10.500 0.17 0.10 0.079 | O| I | | | 3.14

10.583 0.18 0.10 0.079 | O I | | | 3.16

10.667 0.21 0.10 0.080 | O |I | | 3.18

10.750 0.22 0.10 0.081 | O | I | | 3.20

10.833 0.22 0.11 0.082 | O | I | | 3.22

10.917 0.23 0.11 0.082 | |O | I | | 3.25

11.000 0.23 0.11 0.083 | |O | I | | 3.27

11.083 0.23 0.11 0.084 | |O | I | | 3.29

11.167 0.22 0.12 0.085 | |O | I | | 3.31

11.250 0.22 0.12 0.085 | |O | I | | 3.33

11.333 0.22 0.12 0.086 | | O |I | | 3.35

11.417 0.22 0.12 0.087 | | O |I | | 3.37

11.500 0.22 0.13 0.087 | | O |I | | 3.39

11.583 0.21 0.13 0.088 | | O |I | | 3.41

11.667 0.20 0.13 0.088 | | O I | | 3.42

11.750 0.20 0.13 0.089 | | O I | | 3.44

11.833 0.20 0.13 0.089 | | O I | | 3.45

11.917 0.20 0.14 0.090 | | O I | | 3.46

12.000 0.20 0.14 0.090 | | O I | | 3.48

12.083 0.21 0.14 0.091 | | O |I | | 3.49

12.167 0.25 0.14 0.091 | | O | I | | 3.51

12.250 0.27 0.14 0.092 | | O | I | | 3.53

12.333 0.28 0.15 0.093 | | O | I| | 3.56

12.417 0.29 0.15 0.094 | | O | I | 3.59

12.500 0.29 0.15 0.095 | | O | I | 3.62

12.583 0.30 0.15 0.096 | | O | I | 3.65

12.667 0.31 0.15 0.097 | | O | |I | 3.68

12.750 0.31 0.16 0.098 | | O | | I | 3.71

12.833 0.32 0.16 0.099 | | O | | I | 3.74

12.917 0.32 0.16 0.100 | | O | | I | 3.77

13.000 0.33 0.17 0.101 | | O | | I | 3.80

13.083 0.33 0.17 0.102 | | O | | I | 3.84

13.167 0.36 0.17 0.104 | | O | | I | 3.87

13.250 0.38 0.17 0.105 | | O | | I| 3.91

13.333 0.38 0.18 0.106 | | O | | I| 3.95

13.417 0.38 0.18 0.108 | | O| | I| 3.99

13.500 0.38 0.18 0.109 | | O| | I 4.03

13.583 0.37 0.19 0.111 | | O| | I | 4.07

13.667 0.31 0.19 0.112 | | O| |I | 4.10

13.750 0.28 0.19 0.112 | | O| I| | 4.12

13.833 0.27 0.19 0.113 | | O| I | | 4.13

13.917 0.26 0.19 0.113 | | O| I | | 4.15

14.000 0.26 0.19 0.114 | | O I | | 4.16

14.083 0.27 0.19 0.114 | | O I | | 4.18

14.167 0.29 0.20 0.115 | | O I | 4.19

14.250 0.30 0.20 0.116 | | O I | 4.21 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.30 0.20 0.116 | | O |I | 4.23

14.417 0.30 0.20 0.117 | | O I | 4.25

14.500 0.30 0.20 0.118 | | O I | 4.27

14.583 0.29 0.20 0.118 | | O I | 4.29

14.667 0.29 0.20 0.119 | | O I | 4.30

14.750 0.29 0.20 0.120 | | O I | 4.32

14.833 0.29 0.21 0.120 | | |O I | 4.34

14.917 0.29 0.21 0.121 | | |O I| | 4.36

15.000 0.28 0.21 0.121 | | |O I| | 4.37

15.083 0.28 0.21 0.122 | | |O I| | 4.38

15.167 0.28 0.21 0.122 | | |O I | | 4.40

15.250 0.27 0.21 0.123 | | |O I | | 4.41

15.333 0.27 0.21 0.123 | | |O I | | 4.42

15.417 0.26 0.21 0.124 | | |O I | | 4.43

15.500 0.26 0.21 0.124 | | |O I | | 4.44

15.583 0.26 0.21 0.124 | | |O I | | 4.45

15.667 0.23 0.21 0.125 | | |O I | | 4.46

15.750 0.22 0.21 0.125 | | |OI | | 4.46

15.833 0.22 0.21 0.125 | | |OI | | 4.46

15.917 0.22 0.21 0.125 | | |OI | | 4.46

16.000 0.22 0.21 0.125 | | |O | | 4.46

16.083 0.20 0.21 0.125 | | IO | | 4.46

16.167 0.11 0.21 0.124 | I |O | | 4.45

16.250 0.07 0.21 0.123 | I | |O | | 4.43

16.333 0.06 0.21 0.122 | I | |O | | 4.40

16.417 0.05 0.21 0.121 | I | |O | | 4.37

16.500 0.05 0.21 0.120 | I | |O | | 4.34

16.583 0.05 0.20 0.119 | I | O | | 4.31

16.667 0.04 0.20 0.118 | I | O | | 4.28

16.750 0.04 0.20 0.117 | I | O | | 4.25

16.833 0.03 0.20 0.116 | I | O | | 4.22

16.917 0.03 0.19 0.115 | I | O | | 4.19

17.000 0.03 0.19 0.114 | I | O | | 4.16

17.083 0.04 0.19 0.113 | I | O| | | 4.13

17.167 0.05 0.19 0.111 | I | O| | | 4.10

17.250 0.05 0.19 0.111 | I | O| | | 4.07

17.333 0.06 0.19 0.110 | I | O| | | 4.05

17.417 0.06 0.18 0.109 | I | O| | | 4.02

17.500 0.06 0.18 0.108 | I | O| | | 4.00

17.583 0.06 0.18 0.107 | I | O | | | 3.97

17.667 0.06 0.18 0.106 | I | O | | | 3.95

17.750 0.06 0.18 0.105 | I | O | | | 3.92

17.833 0.06 0.17 0.105 | I | O | | | 3.90

17.917 0.05 0.17 0.104 | I | O | | | 3.87

18.000 0.05 0.17 0.103 | I | O | | | 3.85

18.083 0.05 0.17 0.102 | I | O | | | 3.82

18.167 0.05 0.17 0.101 | I | O | | | 3.80

18.250 0.05 0.16 0.100 | I | O | | | 3.78

18.333 0.05 0.16 0.100 | I | O | | | 3.75

18.417 0.05 0.16 0.099 | I | O | | | 3.73

18.500 0.05 0.16 0.098 | I | O | | | 3.71 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

18.583 0.04 0.16 0.097 | I | O | | | 3.68

18.667 0.04 0.15 0.096 | I | O | | | 3.66

18.750 0.04 0.15 0.096 | I | O | | | 3.64

18.833 0.03 0.15 0.095 | I | O | | | 3.61

18.917 0.03 0.15 0.094 | I | O | | | 3.59

19.000 0.02 0.15 0.093 | I | O | | | 3.57

19.083 0.02 0.14 0.092 | I | O | | | 3.54

19.167 0.03 0.14 0.092 | I | O | | | 3.52

19.250 0.03 0.14 0.091 | I | O | | | 3.50

19.333 0.03 0.14 0.090 | I | O | | | 3.47

19.417 0.04 0.13 0.089 | I | O | | | 3.45

19.500 0.04 0.13 0.089 | I | O | | | 3.44

19.583 0.04 0.13 0.088 | I | O | | | 3.42

19.667 0.04 0.13 0.088 | I | O | | | 3.40

19.750 0.04 0.13 0.087 | I | O | | | 3.38

19.833 0.03 0.12 0.086 | I | O | | | 3.36

19.917 0.03 0.12 0.086 | I | O | | | 3.35

20.000 0.02 0.12 0.085 | I |O | | | 3.33

20.083 0.02 0.12 0.084 | I |O | | | 3.31

20.167 0.03 0.11 0.084 | I |O | | | 3.29

20.250 0.03 0.11 0.083 | I |O | | | 3.27

20.333 0.03 0.11 0.083 | I |O | | | 3.26

20.417 0.03 0.11 0.082 | I O | | | 3.24

20.500 0.03 0.11 0.082 | I O | | | 3.23

20.583 0.03 0.10 0.081 | I O | | | 3.21

20.667 0.03 0.10 0.081 | I O | | | 3.20

20.750 0.03 0.10 0.080 | I O | | | 3.19

20.833 0.03 0.10 0.080 | I O | | | 3.17

20.917 0.03 0.10 0.079 | I O | | | 3.16

21.000 0.02 0.10 0.079 | I O| | | | 3.14

21.083 0.02 0.09 0.078 | I O| | | | 3.13

21.167 0.03 0.09 0.078 | I O| | | | 3.12

21.250 0.03 0.09 0.078 | I O| | | | 3.10

21.333 0.03 0.09 0.077 | I O| | | | 3.09

21.417 0.03 0.09 0.077 | I O| | | | 3.08

21.500 0.02 0.09 0.076 | I O| | | | 3.07

21.583 0.02 0.08 0.076 | I O| | | | 3.05

21.667 0.03 0.08 0.075 | I O | | | | 3.04

21.750 0.03 0.08 0.075 | I O | | | | 3.03

21.833 0.03 0.08 0.075 | I O | | | | 3.02

21.917 0.03 0.08 0.074 | I O | | | | 3.01

22.000 0.02 0.08 0.074 | I O | | | | 3.00

22.083 0.02 0.08 0.074 | I O | | | | 2.99

22.167 0.03 0.07 0.073 | I O | | | | 2.98

22.250 0.03 0.07 0.073 | I O | | | | 2.97

22.333 0.03 0.07 0.073 | I O | | | | 2.96

22.417 0.03 0.07 0.073 | I O | | | | 2.95

22.500 0.02 0.07 0.072 | I O | | | | 2.94

22.583 0.02 0.07 0.072 |I O | | | | 2.93

22.667 0.02 0.07 0.072 |I O | | | | 2.92

22.750 0.02 0.06 0.071 |I O | | | | 2.92 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

22.833 0.02 0.06 0.071 |I O | | | | 2.91

22.917 0.02 0.06 0.071 |I O | | | | 2.90

23.000 0.02 0.06 0.070 |I O | | | | 2.89

23.083 0.02 0.06 0.070 |I O | | | | 2.88

23.167 0.02 0.06 0.070 |I O | | | | 2.87

23.250 0.02 0.06 0.070 |I O | | | | 2.87

23.333 0.02 0.06 0.069 |I O | | | | 2.86

23.417 0.02 0.05 0.069 |I O | | | | 2.85

23.500 0.02 0.05 0.069 |I O | | | | 2.84

23.583 0.02 0.05 0.069 |I O | | | | 2.84

23.667 0.02 0.05 0.069 |I O | | | | 2.83

23.750 0.02 0.05 0.068 |I O | | | | 2.83

23.833 0.02 0.05 0.068 |I O | | | | 2.82

23.917 0.02 0.05 0.068 |I O | | | | 2.81

24.000 0.02 0.05 0.068 |I O | | | | 2.81

24.083 0.02 0.05 0.068 |I O | | | | 2.80

24.167 0.01 0.05 0.067 I O | | | | 2.80

24.250 0.00 0.04 0.067 I O | | | | 2.79

24.333 0.00 0.04 0.067 I O | | | | 2.78

24.417 0.00 0.04 0.067 I O | | | | 2.77

24.500 0.00 0.04 0.066 I O | | | | 2.76

24.583 0.00 0.04 0.066 I O | | | | 2.75

24.667 0.00 0.04 0.066 I O | | | | 2.74

24.750 0.00 0.04 0.066 I O | | | | 2.74

24.833 0.00 0.04 0.065 I O | | | | 2.73

24.917 0.00 0.03 0.065 I O | | | | 2.72

25.000 0.00 0.03 0.065 I O | | | | 2.71

25.083 0.00 0.03 0.065 I O | | | | 2.71

25.167 0.00 0.03 0.064 I O | | | | 2.70

25.250 0.00 0.03 0.064 I O | | | | 2.69

25.333 0.00 0.03 0.064 I O | | | | 2.69

25.417 0.00 0.03 0.064 I O | | | | 2.68

25.500 0.00 0.03 0.064 I O | | | | 2.67

25.583 0.00 0.03 0.063 I O | | | | 2.67

25.667 0.00 0.03 0.063 I O | | | | 2.66

25.750 0.00 0.02 0.063 I O | | | | 2.66

25.833 0.00 0.02 0.063 IO | | | | 2.65

25.917 0.00 0.02 0.063 IO | | | | 2.65

26.000 0.00 0.02 0.063 IO | | | | 2.64

26.083 0.00 0.02 0.062 IO | | | | 2.64

26.167 0.00 0.02 0.062 IO | | | | 2.63

26.250 0.00 0.02 0.062 IO | | | | 2.63

26.333 0.00 0.02 0.062 IO | | | | 2.62

26.417 0.00 0.02 0.062 IO | | | | 2.62

26.500 0.00 0.02 0.062 IO | | | | 2.62

26.583 0.00 0.02 0.062 IO | | | | 2.61

26.667 0.00 0.02 0.061 IO | | | | 2.61

26.750 0.00 0.02 0.061 IO | | | | 2.61

26.833 0.00 0.02 0.061 IO | | | | 2.60

26.917 0.00 0.02 0.061 IO | | | | 2.60

27.000 0.00 0.01 0.061 IO | | | | 2.60 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

27.083 0.00 0.01 0.061 IO | | | | 2.59

27.167 0.00 0.01 0.061 IO | | | | 2.59

27.250 0.00 0.01 0.061 IO | | | | 2.59

27.333 0.00 0.01 0.061 IO | | | | 2.58

27.417 0.00 0.01 0.061 IO | | | | 2.58

27.500 0.00 0.01 0.060 IO | | | | 2.58

27.583 0.00 0.01 0.060 O | | | | 2.58

27.667 0.00 0.01 0.060 O | | | | 2.57

27.750 0.00 0.01 0.060 O | | | | 2.57

27.833 0.00 0.01 0.060 O | | | | 2.57

27.917 0.00 0.01 0.060 O | | | | 2.57

28.000 0.00 0.01 0.060 O | | | | 2.56

28.083 0.00 0.01 0.060 O | | | | 2.56

28.167 0.00 0.01 0.060 O | | | | 2.56

28.250 0.00 0.01 0.060 O | | | | 2.56

28.333 0.00 0.01 0.060 O | | | | 2.56

28.417 0.00 0.01 0.060 O | | | | 2.55

28.500 0.00 0.01 0.060 O | | | | 2.55

28.583 0.00 0.01 0.060 O | | | | 2.55

28.667 0.00 0.01 0.060 O | | | | 2.55

28.750 0.00 0.01 0.060 O | | | | 2.55

28.833 0.00 0.01 0.059 O | | | | 2.55

28.917 0.00 0.01 0.059 O | | | | 2.54

29.000 0.00 0.01 0.059 O | | | | 2.54

29.083 0.00 0.01 0.059 O | | | | 2.54

29.167 0.00 0.01 0.059 O | | | | 2.54

29.250 0.00 0.01 0.059 O | | | | 2.54

29.333 0.00 0.01 0.059 O | | | | 2.54

29.417 0.00 0.01 0.059 O | | | | 2.54

29.500 0.00 0.01 0.059 O | | | | 2.53

29.583 0.00 0.01 0.059 O | | | | 2.53

29.667 0.00 0.01 0.059 O | | | | 2.53

29.750 0.00 0.00 0.059 O | | | | 2.53

29.833 0.00 0.00 0.059 O | | | | 2.53

29.917 0.00 0.00 0.059 O | | | | 2.53

30.000 0.00 0.00 0.059 O | | | | 2.53

30.083 0.00 0.00 0.059 O | | | | 2.53

30.167 0.00 0.00 0.059 O | | | | 2.53

30.250 0.00 0.00 0.059 O | | | | 2.53

30.333 0.00 0.00 0.059 O | | | | 2.52

30.417 0.00 0.00 0.059 O | | | | 2.52

30.500 0.00 0.00 0.059 O | | | | 2.52

30.583 0.00 0.00 0.059 O | | | | 2.52

30.667 0.00 0.00 0.059 O | | | | 2.52

30.750 0.00 0.00 0.059 O | | | | 2.52

30.833 0.00 0.00 0.059 O | | | | 2.52

30.917 0.00 0.00 0.059 O | | | | 2.52

31.000 0.00 0.00 0.059 O | | | | 2.52

31.083 0.00 0.00 0.059 O | | | | 2.52

31.167 0.00 0.00 0.059 O | | | | 2.52

31.250 0.00 0.00 0.059 O | | | | 2.52 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

31.333 0.00 0.00 0.059 O | | | | 2.52

31.417 0.00 0.00 0.059 O | | | | 2.52

31.500 0.00 0.00 0.058 O | | | | 2.52

31.583 0.00 0.00 0.058 O | | | | 2.52

31.667 0.00 0.00 0.058 O | | | | 2.51

31.750 0.00 0.00 0.058 O | | | | 2.51

31.833 0.00 0.00 0.058 O | | | | 2.51

31.917 0.00 0.00 0.058 O | | | | 2.51

32.000 0.00 0.00 0.058 O | | | | 2.51

32.083 0.00 0.00 0.058 O | | | | 2.51

32.167 0.00 0.00 0.058 O | | | | 2.51

32.250 0.00 0.00 0.058 O | | | | 2.51

32.333 0.00 0.00 0.058 O | | | | 2.51

32.417 0.00 0.00 0.058 O | | | | 2.51

32.500 0.00 0.00 0.058 O | | | | 2.51

32.583 0.00 0.00 0.058 O | | | | 2.51

32.667 0.00 0.00 0.058 O | | | | 2.51

32.750 0.00 0.00 0.058 O | | | | 2.51

32.833 0.00 0.00 0.058 O | | | | 2.51

32.917 0.00 0.00 0.058 O | | | | 2.51

33.000 0.00 0.00 0.058 O | | | | 2.51

33.083 0.00 0.00 0.058 O | | | | 2.51

33.167 0.00 0.00 0.058 O | | | | 2.51

33.250 0.00 0.00 0.058 O | | | | 2.51

33.333 0.00 0.00 0.058 O | | | | 2.51

33.417 0.00 0.00 0.058 O | | | | 2.51

33.500 0.00 0.00 0.058 O | | | | 2.51

33.583 0.00 0.00 0.058 O | | | | 2.51

33.667 0.00 0.00 0.058 O | | | | 2.51

33.750 0.00 0.00 0.058 O | | | | 2.51 Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 405
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.214 (CFS)
Total volume = 0.176 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
10-YR 1-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A110.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 19
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 3.365 (CFS)
Total volume = 0.095 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 19
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.8 1.68 2.52 3.36 (Ft.)

0.083 0.04 0.00 0.000 O | | | | 0.01

0.167 0.26 0.00 0.001 O I | | | | 0.07

0.250 0.40 0.00 0.003 O I | | | | 0.21

0.333 0.47 0.00 0.006 O I | | | | 0.40

0.417 0.53 0.00 0.010 O I | | | | 0.60

0.500 0.59 0.00 0.014 O I | | | | 0.82

0.583 0.68 0.00 0.018 O I | | | | 1.05

0.667 0.81 0.00 0.023 O I| | | | 1.28

0.750 1.12 0.00 0.030 O | I | | | 1.57

0.833 2.00 0.00 0.041 O | | I | | 1.95

0.917 3.36 0.01 0.059 O | | | I 2.53

1.000 1.87 0.09 0.077 O | |I | | 3.08

1.083 0.98 0.12 0.086 |O |I | | | 3.35

1.167 0.41 0.14 0.090 |O I | | | | 3.47

1.250 0.16 0.14 0.091 |O | | | | 3.50

1.333 0.07 0.14 0.091 IO | | | | 3.49

1.417 0.04 0.14 0.090 IO | | | | 3.47

1.500 0.01 0.13 0.089 IO | | | | 3.45 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.00 0.13 0.088 IO | | | | 3.43

1.667 0.00 0.13 0.088 IO | | | | 3.40

1.750 0.00 0.12 0.087 IO | | | | 3.37

1.833 0.00 0.12 0.086 IO | | | | 3.35

1.917 0.00 0.12 0.085 IO | | | | 3.32

2.000 0.00 0.12 0.084 IO | | | | 3.30

2.083 0.00 0.11 0.083 IO | | | | 3.28

2.167 0.00 0.11 0.083 IO | | | | 3.26

2.250 0.00 0.11 0.082 IO | | | | 3.23

2.333 0.00 0.10 0.081 O | | | | 3.21

2.417 0.00 0.10 0.081 O | | | | 3.19

2.500 0.00 0.10 0.080 O | | | | 3.17

2.583 0.00 0.10 0.079 O | | | | 3.15

2.667 0.00 0.09 0.078 O | | | | 3.13

2.750 0.00 0.09 0.078 O | | | | 3.11

2.833 0.00 0.09 0.077 O | | | | 3.09

2.917 0.00 0.09 0.077 O | | | | 3.08

3.000 0.00 0.09 0.076 O | | | | 3.06

3.083 0.00 0.08 0.075 O | | | | 3.04

3.167 0.00 0.08 0.075 O | | | | 3.03

3.250 0.00 0.08 0.074 O | | | | 3.01

3.333 0.00 0.08 0.074 O | | | | 2.99

3.417 0.00 0.07 0.073 O | | | | 2.98

3.500 0.00 0.07 0.073 O | | | | 2.96

3.583 0.00 0.07 0.072 O | | | | 2.95

3.667 0.00 0.07 0.072 O | | | | 2.93

3.750 0.00 0.07 0.071 O | | | | 2.92

3.833 0.00 0.06 0.071 O | | | | 2.90

3.917 0.00 0.06 0.070 O | | | | 2.89

4.000 0.00 0.06 0.070 O | | | | 2.88

4.083 0.00 0.06 0.070 O | | | | 2.86

4.167 0.00 0.05 0.069 O | | | | 2.85

4.250 0.00 0.05 0.069 O | | | | 2.84

4.333 0.00 0.05 0.069 O | | | | 2.83

4.417 0.00 0.05 0.068 O | | | | 2.82

4.500 0.00 0.05 0.068 O | | | | 2.81

4.583 0.00 0.05 0.068 O | | | | 2.80

4.667 0.00 0.04 0.067 O | | | | 2.79

4.750 0.00 0.04 0.067 O | | | | 2.78

4.833 0.00 0.04 0.067 O | | | | 2.77

4.917 0.00 0.04 0.066 O | | | | 2.76

5.000 0.00 0.04 0.066 O | | | | 2.75

5.083 0.00 0.04 0.066 O | | | | 2.74

5.167 0.00 0.04 0.066 O | | | | 2.74

5.250 0.00 0.04 0.065 O | | | | 2.73

5.333 0.00 0.03 0.065 O | | | | 2.72

5.417 0.00 0.03 0.065 O | | | | 2.71

5.500 0.00 0.03 0.065 O | | | | 2.71

5.583 0.00 0.03 0.064 O | | | | 2.70

5.667 0.00 0.03 0.064 O | | | | 2.69

5.750 0.00 0.03 0.064 O | | | | 2.69 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.00 0.03 0.064 O | | | | 2.68

5.917 0.00 0.03 0.064 O | | | | 2.67

6.000 0.00 0.03 0.063 O | | | | 2.67

6.083 0.00 0.03 0.063 O | | | | 2.66

6.167 0.00 0.02 0.063 O | | | | 2.66

6.250 0.00 0.02 0.063 O | | | | 2.65

6.333 0.00 0.02 0.063 O | | | | 2.65

6.417 0.00 0.02 0.063 O | | | | 2.64

6.500 0.00 0.02 0.062 O | | | | 2.64

6.583 0.00 0.02 0.062 O | | | | 2.63

6.667 0.00 0.02 0.062 O | | | | 2.63

6.750 0.00 0.02 0.062 O | | | | 2.62

6.833 0.00 0.02 0.062 O | | | | 2.62

6.917 0.00 0.02 0.062 O | | | | 2.62

7.000 0.00 0.02 0.062 O | | | | 2.61

7.083 0.00 0.02 0.061 O | | | | 2.61

7.167 0.00 0.02 0.061 O | | | | 2.61

7.250 0.00 0.02 0.061 O | | | | 2.60

7.333 0.00 0.02 0.061 O | | | | 2.60

7.417 0.00 0.01 0.061 O | | | | 2.60

7.500 0.00 0.01 0.061 O | | | | 2.59

7.583 0.00 0.01 0.061 O | | | | 2.59

7.667 0.00 0.01 0.061 O | | | | 2.59

7.750 0.00 0.01 0.061 O | | | | 2.58

7.833 0.00 0.01 0.061 O | | | | 2.58

7.917 0.00 0.01 0.060 O | | | | 2.58

8.000 0.00 0.01 0.060 O | | | | 2.58

8.083 0.00 0.01 0.060 O | | | | 2.57

8.167 0.00 0.01 0.060 O | | | | 2.57

8.250 0.00 0.01 0.060 O | | | | 2.57

8.333 0.00 0.01 0.060 O | | | | 2.57

8.417 0.00 0.01 0.060 O | | | | 2.56

8.500 0.00 0.01 0.060 O | | | | 2.56

8.583 0.00 0.01 0.060 O | | | | 2.56

8.667 0.00 0.01 0.060 O | | | | 2.56

8.750 0.00 0.01 0.060 O | | | | 2.56

8.833 0.00 0.01 0.060 O | | | | 2.55

8.917 0.00 0.01 0.060 O | | | | 2.55

9.000 0.00 0.01 0.060 O | | | | 2.55

9.083 0.00 0.01 0.060 O | | | | 2.55

9.167 0.00 0.01 0.060 O | | | | 2.55

9.250 0.00 0.01 0.059 O | | | | 2.55

9.333 0.00 0.01 0.059 O | | | | 2.54

9.417 0.00 0.01 0.059 O | | | | 2.54

9.500 0.00 0.01 0.059 O | | | | 2.54

9.583 0.00 0.01 0.059 O | | | | 2.54

9.667 0.00 0.01 0.059 O | | | | 2.54

9.750 0.00 0.01 0.059 O | | | | 2.54

9.833 0.00 0.01 0.059 O | | | | 2.54

9.917 0.00 0.01 0.059 O | | | | 2.53

10.000 0.00 0.01 0.059 O | | | | 2.53 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.01 0.059 O | | | | 2.53

10.167 0.00 0.00 0.059 O | | | | 2.53

10.250 0.00 0.00 0.059 O | | | | 2.53

10.333 0.00 0.00 0.059 O | | | | 2.53

10.417 0.00 0.00 0.059 O | | | | 2.53

10.500 0.00 0.00 0.059 O | | | | 2.53

10.583 0.00 0.00 0.059 O | | | | 2.53

10.667 0.00 0.00 0.059 O | | | | 2.53

10.750 0.00 0.00 0.059 O | | | | 2.52

10.833 0.00 0.00 0.059 O | | | | 2.52

10.917 0.00 0.00 0.059 O | | | | 2.52

11.000 0.00 0.00 0.059 O | | | | 2.52

11.083 0.00 0.00 0.059 O | | | | 2.52

11.167 0.00 0.00 0.059 O | | | | 2.52

11.250 0.00 0.00 0.059 O | | | | 2.52

11.333 0.00 0.00 0.059 O | | | | 2.52

11.417 0.00 0.00 0.059 O | | | | 2.52

11.500 0.00 0.00 0.059 O | | | | 2.52

11.583 0.00 0.00 0.059 O | | | | 2.52

11.667 0.00 0.00 0.059 O | | | | 2.52

11.750 0.00 0.00 0.059 O | | | | 2.52

11.833 0.00 0.00 0.059 O | | | | 2.52

11.917 0.00 0.00 0.058 O | | | | 2.52

12.000 0.00 0.00 0.058 O | | | | 2.52

12.083 0.00 0.00 0.058 O | | | | 2.51

12.167 0.00 0.00 0.058 O | | | | 2.51

12.250 0.00 0.00 0.058 O | | | | 2.51

12.333 0.00 0.00 0.058 O | | | | 2.51

12.417 0.00 0.00 0.058 O | | | | 2.51

12.500 0.00 0.00 0.058 O | | | | 2.51

12.583 0.00 0.00 0.058 O | | | | 2.51

12.667 0.00 0.00 0.058 O | | | | 2.51

12.750 0.00 0.00 0.058 O | | | | 2.51

12.833 0.00 0.00 0.058 O | | | | 2.51

12.917 0.00 0.00 0.058 O | | | | 2.51

13.000 0.00 0.00 0.058 O | | | | 2.51

13.083 0.00 0.00 0.058 O | | | | 2.51

13.167 0.00 0.00 0.058 O | | | | 2.51

13.250 0.00 0.00 0.058 O | | | | 2.51

13.333 0.00 0.00 0.058 O | | | | 2.51

13.417 0.00 0.00 0.058 O | | | | 2.51

13.500 0.00 0.00 0.058 O | | | | 2.51

13.583 0.00 0.00 0.058 O | | | | 2.51

13.667 0.00 0.00 0.058 O | | | | 2.51

13.750 0.00 0.00 0.058 O | | | | 2.51

13.833 0.00 0.00 0.058 O | | | | 2.51

13.917 0.00 0.00 0.058 O | | | | 2.51

14.000 0.00 0.00 0.058 O | | | | 2.51

14.083 0.00 0.00 0.058 O | | | | 2.51

14.167 0.00 0.00 0.058 O | | | | 2.51 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Remaining water in basin = 0.06 (Ac.Ft)
****************************HYDROGRAPH DATA**************************** Number of intervals = 170
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.139 (CFS)
Total volume = 0.037 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** -------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 01/21/25
---------------------------------------------------------------------

RCH GARAGE
10-YR 3-HR
DMA-A BMP-1

KIMLEY-HORN
-------------------------------------------------------------------- Program License Serial Number 6443
-------------------------------------------------------------------- ********************* HYDROGRAPH INFORMATION ********************** From study/file name: RCHPH1A310.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 43
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 1.724 (CFS)
Total volume = 0.140 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
______________________________________________________________________ User entry of depth-outflow-storage data
-------------------------------------------------------------------- Total number of inflow hydrograph intervals = 43
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
-------------------------------------------------------------------- -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
--------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)
---------------------------------------------------------------------

0.000 0.000 0.000 0.000 0.000

0.500 0.008 0.001 0.008 0.008

1.000 0.017 0.001 0.017 0.017

1.500 0.028 0.000 0.028 0.028

2.000 0.042 0.000 0.042 0.042

2.500 0.058 0.000 0.058 0.058

3.000 0.074 0.078 0.074 0.074

3.500 0.091 0.140 0.091 0.091

4.000 0.108 0.182 0.107 0.109

4.500 0.126 0.216 0.125 0.127

5.000 0.143 0.245 0.142 0.144

5.500 0.160 0.271 0.159 0.161

6.000 0.177 0.295 0.176 0.178

6.500 0.194 0.317 0.193 0.195

7.000 0.209 0.337 0.208 0.210

7.500 0.223 0.357 0.222 0.224

8.000 0.234 0.443 0.232 0.236

8.500 0.243 0.493 0.241 0.245

9.000 0.251 0.534 0.249 0.253

10.000 0.252 4.346 0.237 0.267
-------------------------------------------------------------------- Hydrograph Detention Basin Routing
--------------------------------------------------------------------- Graph values: 'I'= unit inflow; 'O'=outflow at time shown --------------------------------------------------------------------- Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.4 0.86 1.29 1.72 (Ft.)

0.083 0.03 0.00 0.000 O | | | | 0.01

0.167 0.16 0.00 0.001 O I | | | | 0.05

0.250 0.21 0.00 0.002 O I | | | | 0.12

0.333 0.22 0.00 0.003 O I | | | | 0.21

0.417 0.26 0.00 0.005 O I | | | | 0.32

0.500 0.28 0.00 0.007 O I | | | | 0.43

0.583 0.31 0.00 0.009 O I | | | | 0.55

0.667 0.30 0.00 0.011 O I | | | | 0.67

0.750 0.33 0.00 0.013 O I | | | | 0.79

0.833 0.33 0.00 0.015 O I | | | | 0.91

0.917 0.31 0.00 0.018 O I | | | | 1.03

1.000 0.31 0.00 0.020 O I | | | | 1.12

1.083 0.34 0.00 0.022 O I | | | | 1.22

1.167 0.38 0.00 0.024 O I| | | | 1.34

1.250 0.41 0.00 0.027 O I| | | | 1.46

1.333 0.41 0.00 0.030 O I| | | | 1.57

1.417 0.40 0.00 0.033 O I| | | | 1.67

1.500 0.46 0.00 0.036 O I | | | 1.78 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

1.583 0.49 0.00 0.039 O |I | | | 1.89

1.667 0.47 0.00 0.042 O I | | | 2.01

1.750 0.51 0.00 0.046 O |I | | | 2.11

1.833 0.58 0.00 0.049 O | I | | | 2.23

1.917 0.58 0.00 0.053 O | I | | | 2.36

2.000 0.57 0.00 0.057 O | I | | | 2.48

2.083 0.57 0.02 0.061 O | I | | | 2.60

2.167 0.61 0.03 0.065 O | I | | | 2.72

2.250 0.77 0.06 0.070 |O | I | | | 2.86

2.333 0.90 0.08 0.075 |O | I | | 3.02

2.417 0.86 0.10 0.080 |O | I| | | 3.18

2.500 1.29 0.12 0.087 | O | | I| | 3.38

2.583 1.56 0.15 0.096 | O | | | I | 3.64

2.667 1.72 0.18 0.106 | O | | | I| 3.94

2.750 1.39 0.20 0.115 | O | | |I | 4.20

2.833 0.79 0.21 0.121 | O | I | | | 4.37

2.917 0.53 0.21 0.124 | O |I | | | 4.46

3.000 0.40 0.22 0.126 | O I| | | | 4.51

3.083 0.22 0.22 0.127 | O | | | | 4.52

3.167 0.09 0.22 0.126 |I O | | | | 4.51

3.250 0.04 0.21 0.125 I O | | | | 4.48

3.333 0.01 0.21 0.124 I O | | | | 4.45

3.417 0.01 0.21 0.123 I O | | | | 4.41

3.500 0.00 0.21 0.121 I O | | | | 4.37

3.583 0.00 0.20 0.120 I O | | | | 4.33

3.667 0.00 0.20 0.118 I O | | | | 4.29

3.750 0.00 0.20 0.117 I O | | | | 4.25

3.833 0.00 0.20 0.116 I O | | | | 4.21

3.917 0.00 0.19 0.114 I O | | | | 4.18

4.000 0.00 0.19 0.113 I O | | | | 4.14

4.083 0.00 0.19 0.112 I O | | | | 4.10

4.167 0.00 0.19 0.110 I O | | | | 4.07

4.250 0.00 0.18 0.109 I O | | | | 4.03

4.333 0.00 0.18 0.108 I O | | | | 4.00

4.417 0.00 0.18 0.107 I O | | | | 3.96

4.500 0.00 0.18 0.105 I O | | | | 3.92

4.583 0.00 0.17 0.104 I O | | | | 3.89

4.667 0.00 0.17 0.103 I O | | | | 3.85

4.750 0.00 0.17 0.102 I O | | | | 3.82

4.833 0.00 0.16 0.101 I O | | | | 3.79

4.917 0.00 0.16 0.100 I O | | | | 3.75

5.000 0.00 0.16 0.099 I O | | | | 3.72

5.083 0.00 0.16 0.097 I O | | | | 3.69

5.167 0.00 0.15 0.096 I O | | | | 3.66

5.250 0.00 0.15 0.095 I O | | | | 3.63

5.333 0.00 0.15 0.094 I O | | | | 3.60

5.417 0.00 0.15 0.093 I O | | | | 3.57

5.500 0.00 0.14 0.092 I O | | | | 3.54

5.583 0.00 0.14 0.091 I O | | | | 3.51

5.667 0.00 0.14 0.090 I O | | | | 3.48

5.750 0.00 0.13 0.089 I O | | | | 3.45 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

5.833 0.00 0.13 0.089 I O | | | | 3.43

5.917 0.00 0.13 0.088 I O | | | | 3.40

6.000 0.00 0.12 0.087 I O | | | | 3.38

6.083 0.00 0.12 0.086 I O | | | | 3.35

6.167 0.00 0.12 0.085 I O | | | | 3.33

6.250 0.00 0.12 0.084 I O | | | | 3.30

6.333 0.00 0.11 0.083 I O | | | | 3.28

6.417 0.00 0.11 0.083 I O | | | | 3.26

6.500 0.00 0.11 0.082 IO | | | | 3.23

6.583 0.00 0.10 0.081 IO | | | | 3.21

6.667 0.00 0.10 0.081 IO | | | | 3.19

6.750 0.00 0.10 0.080 IO | | | | 3.17

6.833 0.00 0.10 0.079 IO | | | | 3.15

6.917 0.00 0.09 0.079 IO | | | | 3.13

7.000 0.00 0.09 0.078 IO | | | | 3.11

7.083 0.00 0.09 0.077 IO | | | | 3.10

7.167 0.00 0.09 0.077 IO | | | | 3.08

7.250 0.00 0.09 0.076 IO | | | | 3.06

7.333 0.00 0.08 0.075 IO | | | | 3.04

7.417 0.00 0.08 0.075 IO | | | | 3.03

7.500 0.00 0.08 0.074 IO | | | | 3.01

7.583 0.00 0.08 0.074 IO | | | | 2.99

7.667 0.00 0.07 0.073 IO | | | | 2.98

7.750 0.00 0.07 0.073 IO | | | | 2.96

7.833 0.00 0.07 0.072 IO | | | | 2.95

7.917 0.00 0.07 0.072 IO | | | | 2.93

8.000 0.00 0.07 0.071 IO | | | | 2.92

8.083 0.00 0.06 0.071 IO | | | | 2.90

8.167 0.00 0.06 0.070 IO | | | | 2.89

8.250 0.00 0.06 0.070 IO | | | | 2.88

8.333 0.00 0.06 0.070 IO | | | | 2.86

8.417 0.00 0.06 0.069 IO | | | | 2.85

8.500 0.00 0.05 0.069 O | | | | 2.84

8.583 0.00 0.05 0.069 O | | | | 2.83

8.667 0.00 0.05 0.068 O | | | | 2.82

8.750 0.00 0.05 0.068 O | | | | 2.81

8.833 0.00 0.05 0.068 O | | | | 2.80

8.917 0.00 0.05 0.067 O | | | | 2.79

9.000 0.00 0.04 0.067 O | | | | 2.78

9.083 0.00 0.04 0.067 O | | | | 2.77

9.167 0.00 0.04 0.066 O | | | | 2.76

9.250 0.00 0.04 0.066 O | | | | 2.75

9.333 0.00 0.04 0.066 O | | | | 2.74

9.417 0.00 0.04 0.066 O | | | | 2.74

9.500 0.00 0.04 0.065 O | | | | 2.73

9.583 0.00 0.03 0.065 O | | | | 2.72

9.667 0.00 0.03 0.065 O | | | | 2.71

9.750 0.00 0.03 0.065 O | | | | 2.71

9.833 0.00 0.03 0.064 O | | | | 2.70

9.917 0.00 0.03 0.064 O | | | | 2.69

10.000 0.00 0.03 0.064 O | | | | 2.69 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

10.083 0.00 0.03 0.064 O | | | | 2.68

10.167 0.00 0.03 0.064 O | | | | 2.67

10.250 0.00 0.03 0.063 O | | | | 2.67

10.333 0.00 0.03 0.063 O | | | | 2.66

10.417 0.00 0.02 0.063 O | | | | 2.66

10.500 0.00 0.02 0.063 O | | | | 2.65

10.583 0.00 0.02 0.063 O | | | | 2.65

10.667 0.00 0.02 0.063 O | | | | 2.64

10.750 0.00 0.02 0.062 O | | | | 2.64

10.833 0.00 0.02 0.062 O | | | | 2.63

10.917 0.00 0.02 0.062 O | | | | 2.63

11.000 0.00 0.02 0.062 O | | | | 2.62

11.083 0.00 0.02 0.062 O | | | | 2.62

11.167 0.00 0.02 0.062 O | | | | 2.62

11.250 0.00 0.02 0.062 O | | | | 2.61

11.333 0.00 0.02 0.061 O | | | | 2.61

11.417 0.00 0.02 0.061 O | | | | 2.61

11.500 0.00 0.02 0.061 O | | | | 2.60

11.583 0.00 0.02 0.061 O | | | | 2.60

11.667 0.00 0.01 0.061 O | | | | 2.60

11.750 0.00 0.01 0.061 O | | | | 2.59

11.833 0.00 0.01 0.061 O | | | | 2.59

11.917 0.00 0.01 0.061 O | | | | 2.59

12.000 0.00 0.01 0.061 O | | | | 2.58

12.083 0.00 0.01 0.061 O | | | | 2.58

12.167 0.00 0.01 0.060 O | | | | 2.58

12.250 0.00 0.01 0.060 O | | | | 2.58

12.333 0.00 0.01 0.060 O | | | | 2.57

12.417 0.00 0.01 0.060 O | | | | 2.57

12.500 0.00 0.01 0.060 O | | | | 2.57

12.583 0.00 0.01 0.060 O | | | | 2.57

12.667 0.00 0.01 0.060 O | | | | 2.56

12.750 0.00 0.01 0.060 O | | | | 2.56

12.833 0.00 0.01 0.060 O | | | | 2.56

12.917 0.00 0.01 0.060 O | | | | 2.56

13.000 0.00 0.01 0.060 O | | | | 2.56

13.083 0.00 0.01 0.060 O | | | | 2.55

13.167 0.00 0.01 0.060 O | | | | 2.55

13.250 0.00 0.01 0.060 O | | | | 2.55

13.333 0.00 0.01 0.060 O | | | | 2.55

13.417 0.00 0.01 0.060 O | | | | 2.55

13.500 0.00 0.01 0.059 O | | | | 2.55

13.583 0.00 0.01 0.059 O | | | | 2.54

13.667 0.00 0.01 0.059 O | | | | 2.54

13.750 0.00 0.01 0.059 O | | | | 2.54

13.833 0.00 0.01 0.059 O | | | | 2.54

13.917 0.00 0.01 0.059 O | | | | 2.54

14.000 0.00 0.01 0.059 O | | | | 2.54

14.083 0.00 0.01 0.059 O | | | | 2.54

14.167 0.00 0.01 0.059 O | | | | 2.53

14.250 0.00 0.01 0.059 O | | | | 2.53 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

14.333 0.00 0.01 0.059 O | | | | 2.53

14.417 0.00 0.00 0.059 O | | | | 2.53

14.500 0.00 0.00 0.059 O | | | | 2.53

14.583 0.00 0.00 0.059 O | | | | 2.53

14.667 0.00 0.00 0.059 O | | | | 2.53

14.750 0.00 0.00 0.059 O | | | | 2.53

14.833 0.00 0.00 0.059 O | | | | 2.53

14.917 0.00 0.00 0.059 O | | | | 2.53

15.000 0.00 0.00 0.059 O | | | | 2.52

15.083 0.00 0.00 0.059 O | | | | 2.52

15.167 0.00 0.00 0.059 O | | | | 2.52

15.250 0.00 0.00 0.059 O | | | | 2.52

15.333 0.00 0.00 0.059 O | | | | 2.52

15.417 0.00 0.00 0.059 O | | | | 2.52

15.500 0.00 0.00 0.059 O | | | | 2.52

15.583 0.00 0.00 0.059 O | | | | 2.52

15.667 0.00 0.00 0.059 O | | | | 2.52

15.750 0.00 0.00 0.059 O | | | | 2.52

15.833 0.00 0.00 0.059 O | | | | 2.52

15.917 0.00 0.00 0.059 O | | | | 2.52

16.000 0.00 0.00 0.059 O | | | | 2.52

16.083 0.00 0.00 0.059 O | | | | 2.52

16.167 0.00 0.00 0.058 O | | | | 2.52

16.250 0.00 0.00 0.058 O | | | | 2.52

16.333 0.00 0.00 0.058 O | | | | 2.51

16.417 0.00 0.00 0.058 O | | | | 2.51

16.500 0.00 0.00 0.058 O | | | | 2.51

16.583 0.00 0.00 0.058 O | | | | 2.51

16.667 0.00 0.00 0.058 O | | | | 2.51

16.750 0.00 0.00 0.058 O | | | | 2.51

16.833 0.00 0.00 0.058 O | | | | 2.51

16.917 0.00 0.00 0.058 O | | | | 2.51

17.000 0.00 0.00 0.058 O | | | | 2.51

17.083 0.00 0.00 0.058 O | | | | 2.51

17.167 0.00 0.00 0.058 O | | | | 2.51

17.250 0.00 0.00 0.058 O | | | | 2.51

17.333 0.00 0.00 0.058 O | | | | 2.51

17.417 0.00 0.00 0.058 O | | | | 2.51