Menifee City Council
December 6, 2023

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 68.2 0.382 0.000 0.382 1.000 0.382 Sum (F) = 0.382
Area averaged mean soil loss (F) (In/Hr) = 0.382
Minimum soil loss rate ((In/Hr)) = 0.191
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.132 ( 0.382) 0.119 0.013 2 0.17 1.30 0.132 ( 0.382) 0.119 0.013 3 0.25 1.10 0.112 ( 0.382) 0.101 0.011 4 0.33 1.50 0.153 ( 0.382) 0.138 0.015 5 0.42 1.50 0.153 ( 0.382) 0.138 0.015 6 0.50 1.80 0.183 ( 0.382) 0.165 0.018 7 0.58 1.50 0.153 ( 0.382) 0.138 0.015 8 0.67 1.80 0.183 ( 0.382) 0.165 0.018 9 0.75 1.80 0.183 ( 0.382) 0.165 0.018 10 0.83 1.50 0.153 ( 0.382) 0.138 0.015 11 0.92 1.60 0.163 ( 0.382) 0.147 0.016 12 1.00 1.80 0.183 ( 0.382) 0.165 0.018 13 1.08 2.20 0.224 ( 0.382) 0.202 0.022 14 1.17 2.20 0.224 ( 0.382) 0.202 0.022 15 1.25 2.20 0.224 ( 0.382) 0.202 0.022 16 1.33 2.00 0.204 ( 0.382) 0.183 0.020 17 1.42 2.60 0.265 ( 0.382) 0.238 0.026 18 1.50 2.70 0.275 ( 0.382) 0.248 0.028 19 1.58 2.40 0.245 ( 0.382) 0.220 0.024 20 1.67 2.70 0.275 ( 0.382) 0.248 0.028 21 1.75 3.30 0.336 ( 0.382) 0.303 0.034 22 1.83 3.10 0.316 ( 0.382) 0.284 0.032 23 1.92 2.90 0.296 ( 0.382) 0.266 0.030 24 2.00 3.00 0.306 ( 0.382) 0.275 0.031 25 2.08 3.10 0.316 ( 0.382) 0.284 0.032 26 2.17 4.20 0.428 0.382 ( 0.385) 0.046 27 2.25 5.00 0.510 0.382 ( 0.459) 0.128 28 2.33 3.50 0.357 ( 0.382) 0.321 0.036 29 2.42 6.80 0.693 0.382 ( 0.624) 0.311 30 2.50 7.30 0.744 0.382 ( 0.670) 0.362 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
31 2.58 8.20 0.836 0.382 ( 0.752) 0.454 32 2.67 5.90 0.601 0.382 ( 0.541) 0.220 33 2.75 2.00 0.204 ( 0.382) 0.183 0.020 34 2.83 1.80 0.183 ( 0.382) 0.165 0.018 35 2.92 1.80 0.183 ( 0.382) 0.165 0.018 36 3.00 0.60 0.061 ( 0.382) 0.055 0.006 (Loss Rate Not Used)
Sum = 100.0 Sum = 2.2 Flood volume = Effective rainfall 0.18(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 2.6(Ac.Ft) Total soil loss = 0.67(In)
Total soil loss = 9.661(Ac.Ft)
Total rainfall = 0.85(In)
Flood volume = 113169.4 Cubic Feet
Total soil loss = 420834.3 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 51.585(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 15.0 30.0 45.0 60.0 ----------------------------------------------------------------------- 0+ 5 0.0010 0.15 Q | | | | 0+10 0.0065 0.79 Q | | | | 0+15 0.0164 1.43 Q | | | | 0+20 0.0278 1.66 VQ | | | | 0+25 0.0410 1.91 VQ | | | | 0+30 0.0563 2.22 VQ | | | | 0+35 0.0733 2.47 |Q | | | | 0+40 0.0912 2.60 |Q | | | | 0+45 0.1099 2.72 |Q | | | | 0+50 0.1296 2.86 |Q | | | | 0+55 0.1490 2.82 |QV | | | | 1+ 0 0.1682 2.79 |QV | | | | 1+ 5 0.1887 2.97 |QV | | | | 1+10 0.2113 3.29 | QV | | | | 1+15 0.2357 3.55 | QV | | | | 1+20 0.2609 3.65 | Q V | | | | 1+25 0.2863 3.69 | Q V | | | | 1+30 0.3134 3.94 | Q V | | | | 1+35 0.3426 4.25 | Q V | | | | 1+40 0.3724 4.32 | Q V | | | | 1+45 0.4032 4.48 | Q V | | | | 1+50 0.4370 4.90 | Q V | | | | 1+55 0.4725 5.16 | Q V | | | | 2+ 0 0.5080 5.15 | Q V | | | | 2+ 5 0.5436 5.17 | Q V | | | | 2+10 0.5811 5.44 | Q V | | | | 2+15 0.6305 7.18 | Q V| | | | 2+20 0.7054 10.88 | Q V | | | 2+25 0.8015 13.95 | Q| V | | | 2+30 0.9754 25.25 | | VQ | | | 2+35 1.2622 41.64 | | V| Q | | 2+40 1.6175 51.59 | | | V | Q | 2+45 1.9384 46.60 | | | V|Q | 2+50 2.1439 29.83 | | Q| | V | 2+55 2.2659 17.72 | |Q | | V | 3+ 0 2.3533 12.69 | Q | | | V | 3+ 5 2.4177 9.36 | Q | | | V | 3+10 2.4641 6.73 | Q | | | V | 3+15 2.4982 4.95 | Q | | | V | 3+20 2.5247 3.85 | Q | | | V | 3+25 2.5456 3.04 | Q | | | V| 3+30 2.5617 2.34 |Q | | | V| 3+35 2.5740 1.78 |Q | | | V| 3+40 2.5839 1.44 Q | | | V| 3+45 2.5910 1.03 Q | | | V| 3+50 2.5955 0.65 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
3+55 2.5972 0.25 Q | | | V| 4+ 0 2.5976 0.06 Q | | | V| 4+ 5 2.5978 0.04 Q | | | V| 4+10 2.5980 0.02 Q | | | V| 4+15 2.5980 0.00 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA00262.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 2 YEAR 6 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 1.20 207.84
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 3.00 519.60
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.200(In)
Area Averaged 100-Year Rainfall = 3.000(In)
Point rain (area averaged) = 1.200(In)
Areal adjustment factor = 99.94 %
Adjusted average point rain = 1.199(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 68.2 0.382 0.000 0.382 1.000 0.382 Sum (F) = 0.382
Area averaged mean soil loss (F) (In/Hr) = 0.382
Minimum soil loss rate ((In/Hr)) = 0.191
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.072 ( 0.382) 0.065 0.007 2 0.17 0.60 0.086 ( 0.382) 0.078 0.009 3 0.25 0.60 0.086 ( 0.382) 0.078 0.009 4 0.33 0.60 0.086 ( 0.382) 0.078 0.009 5 0.42 0.60 0.086 ( 0.382) 0.078 0.009 6 0.50 0.70 0.101 ( 0.382) 0.091 0.010 7 0.58 0.70 0.101 ( 0.382) 0.091 0.010 8 0.67 0.70 0.101 ( 0.382) 0.091 0.010 9 0.75 0.70 0.101 ( 0.382) 0.091 0.010 10 0.83 0.70 0.101 ( 0.382) 0.091 0.010 11 0.92 0.70 0.101 ( 0.382) 0.091 0.010 12 1.00 0.80 0.115 ( 0.382) 0.104 0.012 13 1.08 0.80 0.115 ( 0.382) 0.104 0.012 14 1.17 0.80 0.115 ( 0.382) 0.104 0.012 15 1.25 0.80 0.115 ( 0.382) 0.104 0.012 16 1.33 0.80 0.115 ( 0.382) 0.104 0.012 17 1.42 0.80 0.115 ( 0.382) 0.104 0.012 18 1.50 0.80 0.115 ( 0.382) 0.104 0.012 19 1.58 0.80 0.115 ( 0.382) 0.104 0.012 20 1.67 0.80 0.115 ( 0.382) 0.104 0.012 21 1.75 0.80 0.115 ( 0.382) 0.104 0.012 22 1.83 0.80 0.115 ( 0.382) 0.104 0.012 23 1.92 0.80 0.115 ( 0.382) 0.104 0.012 24 2.00 0.90 0.130 ( 0.382) 0.117 0.013 25 2.08 0.80 0.115 ( 0.382) 0.104 0.012 26 2.17 0.90 0.130 ( 0.382) 0.117 0.013 27 2.25 0.90 0.130 ( 0.382) 0.117 0.013 28 2.33 0.90 0.130 ( 0.382) 0.117 0.013 29 2.42 0.90 0.130 ( 0.382) 0.117 0.013 30 2.50 0.90 0.130 ( 0.382) 0.117 0.013 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
31 2.58 0.90 0.130 ( 0.382) 0.117 0.013 32 2.67 0.90 0.130 ( 0.382) 0.117 0.013 33 2.75 1.00 0.144 ( 0.382) 0.130 0.014 34 2.83 1.00 0.144 ( 0.382) 0.130 0.014 35 2.92 1.00 0.144 ( 0.382) 0.130 0.014 36 3.00 1.00 0.144 ( 0.382) 0.130 0.014 37 3.08 1.00 0.144 ( 0.382) 0.130 0.014 38 3.17 1.10 0.158 ( 0.382) 0.142 0.016 39 3.25 1.10 0.158 ( 0.382) 0.142 0.016 40 3.33 1.10 0.158 ( 0.382) 0.142 0.016 41 3.42 1.20 0.173 ( 0.382) 0.155 0.017 42 3.50 1.30 0.187 ( 0.382) 0.168 0.019 43 3.58 1.40 0.201 ( 0.382) 0.181 0.020 44 3.67 1.40 0.201 ( 0.382) 0.181 0.020 45 3.75 1.50 0.216 ( 0.382) 0.194 0.022 46 3.83 1.50 0.216 ( 0.382) 0.194 0.022 47 3.92 1.60 0.230 ( 0.382) 0.207 0.023 48 4.00 1.60 0.230 ( 0.382) 0.207 0.023 49 4.08 1.70 0.245 ( 0.382) 0.220 0.024 50 4.17 1.80 0.259 ( 0.382) 0.233 0.026 51 4.25 1.90 0.273 ( 0.382) 0.246 0.027 52 4.33 2.00 0.288 ( 0.382) 0.259 0.029 53 4.42 2.10 0.302 ( 0.382) 0.272 0.030 54 4.50 2.10 0.302 ( 0.382) 0.272 0.030 55 4.58 2.20 0.317 ( 0.382) 0.285 0.032 56 4.67 2.30 0.331 ( 0.382) 0.298 0.033 57 4.75 2.40 0.345 ( 0.382) 0.311 0.035 58 4.83 2.40 0.345 ( 0.382) 0.311 0.035 59 4.92 2.50 0.360 ( 0.382) 0.324 0.036 60 5.00 2.60 0.374 ( 0.382) 0.337 0.037 61 5.08 3.10 0.446 0.382 ( 0.402) 0.064 62 5.17 3.60 0.518 0.382 ( 0.466) 0.136 63 5.25 3.90 0.561 0.382 ( 0.505) 0.180 64 5.33 4.20 0.604 0.382 ( 0.544) 0.223 65 5.42 4.70 0.676 0.382 ( 0.609) 0.295 66 5.50 5.60 0.806 0.382 ( 0.725) 0.424 67 5.58 1.90 0.273 ( 0.382) 0.246 0.027 68 5.67 0.90 0.130 ( 0.382) 0.117 0.013 69 5.75 0.60 0.086 ( 0.382) 0.078 0.009 70 5.83 0.50 0.072 ( 0.382) 0.065 0.007 71 5.92 0.30 0.043 ( 0.382) 0.039 0.004 72 6.00 0.20 0.029 ( 0.382) 0.026 0.003 (Loss Rate Not Used)
Sum = 100.0 Sum = 2.4 Flood volume = Effective rainfall 0.20(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 2.9(Ac.Ft) Total soil loss = 1.00(In)
Total soil loss = 14.423(Ac.Ft)
Total rainfall = 1.20(In)
Flood volume = 125755.2 Cubic Feet
Total soil loss = 628254.8 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 44.584(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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 12.5 25.0 37.5 50.0 ----------------------------------------------------------------------- 0+ 5 0.0006 0.08 Q | | | | 0+10 0.0036 0.45 Q | | | | 0+15 0.0097 0.88 Q | | | | 0+20 0.0173 1.10 Q | | | | 0+25 0.0257 1.22 Q | | | | 0+30 0.0347 1.31 VQ | | | | 0+35 0.0445 1.43 VQ | | | | 0+40 0.0552 1.54 VQ | | | | 0+45 0.0662 1.60 VQ | | | | 0+50 0.0775 1.64 |Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+55 0.0890 1.67 |Q | | | | 1+ 0 0.1008 1.71 |Q | | | | 1+ 5 0.1132 1.80 |Q | | | | 1+10 0.1262 1.89 |Q | | | | 1+15 0.1395 1.93 |Q | | | | 1+20 0.1530 1.96 |QV | | | | 1+25 0.1666 1.97 |QV | | | | 1+30 0.1802 1.98 |QV | | | | 1+35 0.1939 1.99 |QV | | | | 1+40 0.2076 1.99 |QV | | | | 1+45 0.2214 2.00 |Q V | | | | 1+50 0.2352 2.00 |Q V | | | | 1+55 0.2490 2.01 |Q V | | | | 2+ 0 0.2629 2.02 |Q V | | | | 2+ 5 0.2773 2.08 |Q V | | | | 2+10 0.2917 2.10 |Q V | | | | 2+15 0.3064 2.13 |Q V | | | | 2+20 0.3214 2.19 |Q V | | | | 2+25 0.3366 2.21 |Q V | | | | 2+30 0.3520 2.22 |Q V | | | | 2+35 0.3673 2.23 |Q V | | | | 2+40 0.3828 2.24 |Q V | | | | 2+45 0.3984 2.26 |Q V | | | | 2+50 0.4145 2.34 |Q V | | | | 2+55 0.4311 2.41 |Q V | | | | 3+ 0 0.4479 2.44 |Q V | | | | 3+ 5 0.4649 2.46 |Q V | | | | 3+10 0.4820 2.49 |Q V | | | | 3+15 0.4997 2.57 | Q V | | | | 3+20 0.5180 2.65 | Q V | | | | 3+25 0.5366 2.70 | Q V | | | | 3+30 0.5560 2.81 | Q V | | | | 3+35 0.5765 2.98 | Q V | | | | 3+40 0.5983 3.17 | Q V | | | | 3+45 0.6211 3.31 | Q V | | | | 3+50 0.6449 3.45 | Q V | | | | 3+55 0.6695 3.58 | Q V| | | | 4+ 0 0.6950 3.71 | Q V| | | | 4+ 5 0.7214 3.83 | Q V| | | | 4+10 0.7488 3.98 | Q V | | | 4+15 0.7776 4.17 | Q V | | | 4+20 0.8078 4.39 | Q |V | | | 4+25 0.8396 4.62 | Q |V | | | 4+30 0.8729 4.84 | Q | V | | | 4+35 0.9074 5.00 | Q | V | | | 4+40 0.9430 5.17 | Q | V | | | 4+45 0.9801 5.39 | Q | V | | | 4+50 1.0186 5.60 | Q | V | | | 4+55 1.0583 5.76 | Q | V | | | 5+ 0 1.0992 5.93 | Q | V | | | 5+ 5 1.1435 6.43 | Q | V | | | 5+10 1.2034 8.71 | Q | V | | | 5+15 1.3007 14.12 | |Q V | | | 5+20 1.4449 20.93 | | Q V | | 5+25 1.6370 27.90 | | | Q | | 5+30 1.8920 37.03 | | | V Q| | 5+35 2.1991 44.58 | | | V Q | 5+40 2.4370 34.55 | | | Q | V | 5+45 2.5651 18.59 | | Q | | V | 5+50 2.6474 11.96 | Q| | | V | 5+55 2.7079 8.78 | Q | | | V | 6+ 0 2.7534 6.61 | Q | | | V | 6+ 5 2.7881 5.03 | Q | | | V | 6+10 2.8141 3.79 | Q | | | V | 6+15 2.8345 2.95 | Q | | | V| 6+20 2.8501 2.28 |Q | | | V| 6+25 2.8623 1.77 |Q | | | V| 6+30 2.8714 1.33 |Q | | | V| 6+35 2.8781 0.97 Q | | | V| 6+40 2.8831 0.72 Q | | | V| 6+45 2.8860 0.42 Q | | | V| 6+50 2.8864 0.06 Q | | | V| 6+55 2.8867 0.04 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
7+ 0 2.8868 0.02 Q | | | V| 7+ 5 2.8869 0.01 Q | | | V| 7+10 2.8869 0.01 Q | | | V| 7+15 2.8869 0.00 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 11/08/21 File: EXA002242.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 2 YEAR HOUR STORM

HUNSAKER & ASSOCIATES,
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 Min.

Unit time = 15.00 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]
173.20 2.00 346.40
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 5.00 866.00
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 2.000(In)
Area Averaged 100-Year Rainfall = 5.000(In)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Point rain (area averaged) = 2.000(In)
Areal adjustment factor = 99.97 %
Adjusted average point rain = 1.999(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 68.2 0.382 0.000 0.382 1.000 0.382 Sum (F) = 0.382
Area averaged mean soil loss (F) (In/Hr) = 0.382
Minimum soil loss rate ((In/Hr)) = 0.191
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.250 155.929 34.579 60.360 2 0.500 311.858 46.572 81.293 3 0.750 467.787 10.847 18.934 4 1.000 623.715 4.704 8.211 5 1.250 779.644 2.305 4.023 6 1.500 935.573 0.992 1.732 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.25 0.20 0.016 ( 0.674) 0.014 0.002 2 0.50 0.30 0.024 ( 0.666) 0.022 0.002 3 0.75 0.30 0.024 ( 0.658) 0.022 0.002 4 1.00 0.40 0.032 ( 0.651) 0.029 0.003 5 1.25 0.30 0.024 ( 0.643) 0.022 0.002 6 1.50 0.30 0.024 ( 0.635) 0.022 0.002 7 1.75 0.30 0.024 ( 0.628) 0.022 0.002 8 2.00 0.40 0.032 ( 0.620) 0.029 0.003 9 2.25 0.40 0.032 ( 0.613) 0.029 0.003 10 2.50 0.40 0.032 ( 0.605) 0.029 0.003 11 2.75 0.50 0.040 ( 0.598) 0.036 0.004 12 3.00 0.50 0.040 ( 0.590) 0.036 0.004 13 3.25 0.50 0.040 ( 0.583) 0.036 0.004 14 3.50 0.50 0.040 ( 0.576) 0.036 0.004 15 3.75 0.50 0.040 ( 0.569) 0.036 0.004 16 4.00 0.60 0.048 ( 0.562) 0.043 0.005 17 4.25 0.60 0.048 ( 0.554) 0.043 0.005 18 4.50 0.70 0.056 ( 0.547) 0.050 0.006 19 4.75 0.70 0.056 ( 0.540) 0.050 0.006 20 5.00 0.80 0.064 ( 0.533) 0.058 0.006 21 5.25 0.60 0.048 ( 0.526) 0.043 0.005 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
22 5.50 0.70 0.056 ( 0.520) 0.050 0.006 23 5.75 0.80 0.064 ( 0.513) 0.058 0.006 24 6.00 0.80 0.064 ( 0.506) 0.058 0.006 25 6.25 0.90 0.072 ( 0.499) 0.065 0.007 26 6.50 0.90 0.072 ( 0.493) 0.065 0.007 27 6.75 1.00 0.080 ( 0.486) 0.072 0.008 28 7.00 1.00 0.080 ( 0.479) 0.072 0.008 29 7.25 1.00 0.080 ( 0.473) 0.072 0.008 30 7.50 1.10 0.088 ( 0.467) 0.079 0.009 31 7.75 1.20 0.096 ( 0.460) 0.086 0.010 32 8.00 1.30 0.104 ( 0.454) 0.094 0.010 33 8.25 1.50 0.120 ( 0.447) 0.108 0.012 34 8.50 1.50 0.120 ( 0.441) 0.108 0.012 35 8.75 1.60 0.128 ( 0.435) 0.115 0.013 36 9.00 1.70 0.136 ( 0.429) 0.122 0.014 37 9.25 1.90 0.152 ( 0.423) 0.137 0.015 38 9.50 2.00 0.160 ( 0.417) 0.144 0.016 39 9.75 2.10 0.168 ( 0.411) 0.151 0.017 40 10.00 2.20 0.176 ( 0.405) 0.158 0.018 41 10.25 1.50 0.120 ( 0.399) 0.108 0.012 42 10.50 1.50 0.120 ( 0.393) 0.108 0.012 43 10.75 2.00 0.160 ( 0.388) 0.144 0.016 44 11.00 2.00 0.160 ( 0.382) 0.144 0.016 45 11.25 1.90 0.152 ( 0.376) 0.137 0.015 46 11.50 1.90 0.152 ( 0.371) 0.137 0.015 47 11.75 1.70 0.136 ( 0.365) 0.122 0.014 48 12.00 1.80 0.144 ( 0.360) 0.130 0.014 49 12.25 2.50 0.200 ( 0.354) 0.180 0.020 50 12.50 2.60 0.208 ( 0.349) 0.187 0.021 51 12.75 2.80 0.224 ( 0.344) 0.202 0.022 52 13.00 2.90 0.232 ( 0.339) 0.209 0.023 53 13.25 3.40 0.272 ( 0.334) 0.245 0.027 54 13.50 3.40 0.272 ( 0.329) 0.245 0.027 55 13.75 2.30 0.184 ( 0.324) 0.166 0.018 56 14.00 2.30 0.184 ( 0.319) 0.166 0.018 57 14.25 2.70 0.216 ( 0.314) 0.194 0.022 58 14.50 2.60 0.208 ( 0.309) 0.187 0.021 59 14.75 2.60 0.208 ( 0.304) 0.187 0.021 60 15.00 2.50 0.200 ( 0.300) 0.180 0.020 61 15.25 2.40 0.192 ( 0.295) 0.173 0.019 62 15.50 2.30 0.184 ( 0.291) 0.166 0.018 63 15.75 1.90 0.152 ( 0.286) 0.137 0.015 64 16.00 1.90 0.152 ( 0.282) 0.137 0.015 65 16.25 0.40 0.032 ( 0.277) 0.029 0.003 66 16.50 0.40 0.032 ( 0.273) 0.029 0.003 67 16.75 0.30 0.024 ( 0.269) 0.022 0.002 68 17.00 0.30 0.024 ( 0.265) 0.022 0.002 69 17.25 0.50 0.040 ( 0.261) 0.036 0.004 70 17.50 0.50 0.040 ( 0.257) 0.036 0.004 71 17.75 0.50 0.040 ( 0.253) 0.036 0.004 72 18.00 0.40 0.032 ( 0.249) 0.029 0.003 73 18.25 0.40 0.032 ( 0.246) 0.029 0.003 74 18.50 0.40 0.032 ( 0.242) 0.029 0.003 75 18.75 0.30 0.024 ( 0.239) 0.022 0.002 76 19.00 0.20 0.016 ( 0.235) 0.014 0.002 77 19.25 0.30 0.024 ( 0.232) 0.022 0.002 78 19.50 0.40 0.032 ( 0.229) 0.029 0.003 79 19.75 0.30 0.024 ( 0.226) 0.022 0.002 80 20.00 0.20 0.016 ( 0.223) 0.014 0.002 81 20.25 0.30 0.024 ( 0.220) 0.022 0.002 82 20.50 0.30 0.024 ( 0.217) 0.022 0.002 83 20.75 0.30 0.024 ( 0.214) 0.022 0.002 84 21.00 0.20 0.016 ( 0.211) 0.014 0.002 85 21.25 0.30 0.024 ( 0.209) 0.022 0.002 86 21.50 0.20 0.016 ( 0.207) 0.014 0.002 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
87 21.75 0.30 0.024 ( 0.204) 0.022 0.002 88 22.00 0.20 0.016 ( 0.202) 0.014 0.002 89 22.25 0.30 0.024 ( 0.200) 0.022 0.002 90 22.50 0.20 0.016 ( 0.198) 0.014 0.002 91 22.75 0.20 0.016 ( 0.197) 0.014 0.002 92 23.00 0.20 0.016 ( 0.195) 0.014 0.002 93 23.25 0.20 0.016 ( 0.194) 0.014 0.002 94 23.50 0.20 0.016 ( 0.193) 0.014 0.002 95 23.75 0.20 0.016 ( 0.192) 0.014 0.002 96 24.00 0.20 0.016 ( 0.191) 0.014 0.002 (Loss Rate Not Used)
Sum = 100.0 Sum = 0.8 Flood volume = Effective rainfall 0.20(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 2.9(Ac.Ft) Total soil loss = 1.80(In)
Total soil loss = 25.971(Ac.Ft)
Total rainfall = 2.00(In)
Flood volume = 125700.7 Cubic Feet
Total soil loss = 1131306.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 4.595(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 15 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+15 0.0020 0.10 Q | | | | 0+30 0.0077 0.27 VQ | | | | 0+45 0.0153 0.37 VQ | | | | 1+ 0 0.0246 0.45 VQ | | | | 1+15 0.0344 0.48 VQ | | | | 1+30 0.0434 0.43 VQ | | | | 1+45 0.0521 0.43 VQ | | | | 2+ 0 0.0619 0.47 VQ | | | | 2+15 0.0729 0.53 VQ | | | | 2+30 0.0842 0.55 |VQ | | | | 2+45 0.0967 0.60 |VQ | | | | 3+ 0 0.1105 0.67 |VQ | | | | 3+15 0.1247 0.69 |VQ | | | | 3+30 0.1390 0.69 |VQ | | | | 3+45 0.1534 0.70 | Q | | | | 4+ 0 0.1689 0.75 | Q | | | | 4+15 0.1856 0.81 | VQ | | | | 4+30 0.2037 0.88 | VQ | | | | 4+45 0.2233 0.95 | Q | | | | 5+ 0 0.2442 1.01 | VQ | | | | 5+15 0.2647 0.99 | Q | | | | 5+30 0.2838 0.93 | Q | | | | 5+45 0.3048 1.02 | Q | | | | 6+ 0 0.3273 1.09 | Q | | | | 6+15 0.3511 1.15 | Q | | | | 6+30 0.3764 1.22 | QV | | | | 6+45 0.4031 1.29 | Q | | | | 7+ 0 0.4313 1.37 | Q | | | | 7+15 0.4599 1.38 | QV | | | | 7+30 0.4897 1.44 | QV | | | | 7+45 0.5219 1.56 | QV | | | | 8+ 0 0.5567 1.69 | QV | | | | 8+15 0.5954 1.87 | QV | | | | 8+30 0.6372 2.03 | Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
8+45 0.6809 2.11 | QV| | | | 9+ 0 0.7273 2.25 | Q V | | | 9+15 0.7775 2.43 | QV | | | 9+30 0.8319 2.63 | QV | | | 9+45 0.8895 2.79 | |QV | | | 10+ 0 0.9501 2.93 | |Q V | | | 10+15 1.0057 2.69 | Q V | | | 10+30 1.0524 2.26 | Q| V | | | 10+45 1.1022 2.41 | Q| V | | | 11+ 0 1.1578 2.69 | Q V | | | 11+15 1.2136 2.70 | Q V | | | 11+30 1.2685 2.66 | Q V | | | 11+45 1.3214 2.56 | Q V | | | 12+ 0 1.3727 2.48 | Q| V| | | 12+15 1.4315 2.85 | |Q V| | | 12+30 1.5008 3.35 | | Q V | | 12+45 1.5756 3.62 | | Q |V | | 13+ 0 1.6554 3.86 | | Q | V | | 13+15 1.7428 4.23 | | Q | V | | 13+30 1.8377 4.60 | | Q | V | | 13+45 1.9236 4.15 | | Q | V | | 14+ 0 1.9954 3.48 | | Q | V | | 14+15 2.0682 3.52 | | Q | V | | 14+30 2.1440 3.67 | | Q | V| | 14+45 2.2189 3.63 | | Q | V | 15+ 0 2.2928 3.58 | | Q | |V | 15+15 2.3645 3.47 | | Q | | V | 15+30 2.4335 3.34 | | Q | | V | 15+45 2.4968 3.06 | | Q | | V | 16+ 0 2.5542 2.78 | |Q | | V | 16+15 2.5951 1.98 | Q | | | V | 16+30 2.6152 0.97 | Q | | | V | 16+45 2.6293 0.68 | Q | | | V | 17+ 0 2.6399 0.51 | Q | | | V | 17+15 2.6512 0.55 | Q | | | V | 17+30 2.6647 0.65 | Q | | | V | 17+45 2.6787 0.68 | Q | | | V | 18+ 0 2.6919 0.64 | Q | | | V | 18+15 2.7039 0.58 | Q | | | V | 18+30 2.7157 0.57 | Q | | | V | 18+45 2.7263 0.51 | Q | | | V | 19+ 0 2.7346 0.40 |Q | | | V | 19+15 2.7421 0.37 |Q | | | V | 19+30 2.7516 0.46 |Q | | | V | 19+45 2.7615 0.48 |Q | | | V | 20+ 0 2.7694 0.38 |Q | | | V | 20+15 2.7768 0.36 |Q | | | V | 20+30 2.7852 0.41 |Q | | | V | 20+45 2.7937 0.41 |Q | | | V | 21+ 0 2.8013 0.37 |Q | | | V | 21+15 2.8086 0.35 |Q | | | V | 21+30 2.8160 0.36 |Q | | | V| 21+45 2.8231 0.35 |Q | | | V| 22+ 0 2.8304 0.35 |Q | | | V| 22+15 2.8376 0.35 |Q | | | V| 22+30 2.8449 0.35 |Q | | | V| 22+45 2.8510 0.30 |Q | | | V| 23+ 0 2.8569 0.29 |Q | | | V| 23+15 2.8628 0.28 |Q | | | V| 23+30 2.8686 0.28 |Q | | | V| 23+45 2.8743 0.28 |Q | | | V| 24+ 0 2.8801 0.28 |Q | | | V| 24+15 2.8839 0.18 Q | | | V| 24+30 2.8850 0.05 Q | | | V| 24+45 2.8854 0.02 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
25+ 0 2.8856 0.01 Q | | | V| 25+15 2.8857 0.00 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 10 Year - Pre-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA010110.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 10 YEAR 1 HOUR STORM

HUNSAKER & ASSOCIATES
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 0.55 95.26
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 1.30 225.16
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 0.859(In)
Areal adjustment factor = 99.84 %
Adjusted average point rain = 0.857(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 83.7 0.202 0.000 0.202 1.000 0.202 Sum (F) = 0.202
Area averaged mean soil loss (F) (In/Hr) = 0.202
Minimum soil loss rate ((In/Hr)) = 0.101
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5300 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 3.40 0.350 0.202 ( 0.315) 0.148 2 0.17 4.70 0.483 0.202 ( 0.435) 0.282 3 0.25 4.70 0.483 0.202 ( 0.435) 0.282 4 0.33 5.10 0.525 0.202 ( 0.472) 0.323 5 0.42 5.80 0.597 0.202 ( 0.537) 0.395 6 0.50 5.90 0.607 0.202 ( 0.546) 0.405 7 0.58 7.10 0.730 0.202 ( 0.657) 0.529 8 0.67 8.70 0.895 0.202 ( 0.805) 0.693 9 0.75 13.20 1.358 0.202 ( 1.222) 1.156 10 0.83 29.70 3.055 0.202 ( 2.750) 2.853 11 0.92 7.70 0.792 0.202 ( 0.713) 0.590 12 1.00 4.00 0.411 0.202 ( 0.370) 0.210 (Loss Rate Not Used)
Sum = 100.0 Sum = 7.9 Flood volume = Effective rainfall 0.66(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 9.5(Ac.Ft) Total soil loss = 0.20(In)
Total soil loss = 2.913(Ac.Ft)
Total rainfall = 0.86(In)
Flood volume = 412053.2 Cubic Feet
Total soil loss = 126887.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 232.917(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
-------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 75.0 150.0 225.0 300.0 ----------------------------------------------------------------------- 0+ 5 0.0116 1.68 Q | | | | 0+10 0.0831 10.38 VQ | | | | 0+15 0.2502 24.27 |V Q | | | | 0+20 0.4884 34.59 | V Q | | | | 0+25 0.7776 41.98 | V Q | | | | 0+30 1.1246 50.39 | V Q | | | | 0+35 1.5289 58.70 | VQ | | | | 0+40 2.0146 70.52 | VQ| | | | 0+45 2.6507 92.37 | |VQ | | | 0+50 3.6614 146.76 | | V Q| | | 0+55 5.2656 232.92 | | | V |Q | 1+ 0 6.7622 217.31 | | | Q | | 1+ 5 7.6438 128.00 | | Q | | V | 1+10 8.1653 75.73 | Q | | V | 1+15 8.5019 48.87 | Q | | | V | 1+20 8.7420 34.87 | Q | | | V | 1+25 8.9216 26.08 | Q | | | V | 1+30 9.0570 19.66 | Q | | | V | 1+35 9.1656 15.77 | Q | | | V | 1+40 9.2501 12.26 |Q | | | V| 1+45 9.3154 9.49 |Q | | | V| 1+50 9.3653 7.23 Q | | | V| 1+55 9.4027 5.44 Q | | | V| 2+ 0 9.4327 4.36 Q | | | V| 2+ 5 9.4537 3.05 Q | | | V| 2+10 9.4583 0.67 Q | | | V| 2+15 9.4594 0.17 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA010310.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 10 YEAR 3 HOUR STORM

HUNSAKER & ASSOCIATES
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 0.85 147.22
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 2.00 346.40
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 1.323(In)
Areal adjustment factor = 99.92 %
Adjusted average point rain = 1.322(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 83.7 0.202 0.000 0.202 1.000 0.202 Sum (F) = 0.202
Area averaged mean soil loss (F) (In/Hr) = 0.202
Minimum soil loss rate ((In/Hr)) = 0.101
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.206 ( 0.202) 0.186 0.021 2 0.17 1.30 0.206 ( 0.202) 0.186 0.021 3 0.25 1.10 0.175 ( 0.202) 0.157 0.017 4 0.33 1.50 0.238 0.202 ( 0.214) 0.036 5 0.42 1.50 0.238 0.202 ( 0.214) 0.036 6 0.50 1.80 0.286 0.202 ( 0.257) 0.084 7 0.58 1.50 0.238 0.202 ( 0.214) 0.036 8 0.67 1.80 0.286 0.202 ( 0.257) 0.084 9 0.75 1.80 0.286 0.202 ( 0.257) 0.084 10 0.83 1.50 0.238 0.202 ( 0.214) 0.036 11 0.92 1.60 0.254 0.202 ( 0.228) 0.052 12 1.00 1.80 0.286 0.202 ( 0.257) 0.084 13 1.08 2.20 0.349 0.202 ( 0.314) 0.147 14 1.17 2.20 0.349 0.202 ( 0.314) 0.147 15 1.25 2.20 0.349 0.202 ( 0.314) 0.147 16 1.33 2.00 0.317 0.202 ( 0.286) 0.115 17 1.42 2.60 0.413 0.202 ( 0.371) 0.211 18 1.50 2.70 0.428 0.202 ( 0.386) 0.227 19 1.58 2.40 0.381 0.202 ( 0.343) 0.179 20 1.67 2.70 0.428 0.202 ( 0.386) 0.227 21 1.75 3.30 0.524 0.202 ( 0.471) 0.322 22 1.83 3.10 0.492 0.202 ( 0.443) 0.290 23 1.92 2.90 0.460 0.202 ( 0.414) 0.258 24 2.00 3.00 0.476 0.202 ( 0.428) 0.274 25 2.08 3.10 0.492 0.202 ( 0.443) 0.290 26 2.17 4.20 0.666 0.202 ( 0.600) 0.465 27 2.25 5.00 0.793 0.202 ( 0.714) 0.591 28 2.33 3.50 0.555 0.202 ( 0.500) 0.353 29 2.42 6.80 1.079 0.202 ( 0.971) 0.877 30 2.50 7.30 1.158 0.202 ( 1.042) 0.956 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
31 2.58 8.20 1.301 0.202 ( 1.171) 1.099 32 2.67 5.90 0.936 0.202 ( 0.842) 0.734 33 2.75 2.00 0.317 0.202 ( 0.286) 0.115 34 2.83 1.80 0.286 0.202 ( 0.257) 0.084 35 2.92 1.80 0.286 0.202 ( 0.257) 0.084 36 3.00 0.60 0.095 ( 0.202) 0.086 0.010 (Loss Rate Not Used)
Sum = 100.0 Sum = 8.8 Flood volume = Effective rainfall 0.73(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 10.6(Ac.Ft) Total soil loss = 0.59(In)
Total soil loss = 8.506(Ac.Ft)
Total rainfall = 1.32(In)
Flood volume = 460700.5 Cubic Feet
Total soil loss = 370535.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 144.648(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 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+ 5 0.0016 0.23 Q | | | | 0+10 0.0101 1.24 Q | | | | 0+15 0.0255 2.23 Q | | | | 0+20 0.0443 2.73 Q | | | | 0+25 0.0699 3.72 Q | | | | 0+30 0.1064 5.29 VQ | | | | 0+35 0.1584 7.55 VQ | | | | 0+40 0.2164 8.43 VQ | | | | 0+45 0.2825 9.59 |Q | | | | 0+50 0.3589 11.10 |VQ | | | | 0+55 0.4274 9.94 |Q | | | | 1+ 0 0.4909 9.22 |Q | | | | 1+ 5 0.5711 11.64 | Q | | | | 1+10 0.6838 16.37 | VQ | | | | 1+15 0.8233 20.25 | VQ | | | | 1+20 0.9722 21.63 | VQ | | | | 1+25 1.1249 22.17 | Q | | | | 1+30 1.3047 26.10 | VQ | | | | 1+35 1.5175 30.90 | VQ | | | | 1+40 1.7377 31.98 | Q | | | | 1+45 1.9751 34.46 | QV | | | | 1+50 2.2578 41.06 | Q | | | | 1+55 2.5686 45.12 | Q| | | | 2+ 0 2.8778 44.90 | Q V | | | 2+ 5 3.1889 45.17 | Q| V | | | 2+10 3.5253 48.85 | Q| V | | | 2+15 3.9396 60.16 | | Q V | | | 2+20 4.4427 73.05 | | Q V | | | 2+25 4.9797 77.97 | | Q V | | | 2+30 5.6511 97.49 | | Q|V | | 2+35 6.5268 127.15 | | | VQ | | 2+40 7.5230 144.65 | | | Q | | 2+45 8.4491 134.47 | | | Q |V | 2+50 9.0953 93.83 | | Q | | V | 2+55 9.5005 58.82 | |Q | | V | 3+ 0 9.7952 42.80 | Q | | | V | 3+ 5 10.0090 31.03 | Q | | | V | 3+10 10.1579 21.63 | Q | | | V | 3+15 10.2673 15.88 | Q | | | V | 3+20 10.3513 12.21 | Q | | | V| 3+25 10.4171 9.55 |Q | | | V| 3+30 10.4669 7.22 |Q | | | V| 3+35 10.5040 5.39 |Q | | | V| 3+40 10.5329 4.19 Q | | | V| 3+45 10.5533 2.96 Q | | | V| 3+50 10.5666 1.93 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
3+55 10.5728 0.90 Q | | | V| 4+ 0 10.5746 0.26 Q | | | V| 4+ 5 10.5756 0.15 Q | | | V| 4+10 10.5762 0.08 Q | | | V| 4+15 10.5762 0.01 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA010610.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 10 YEAR 6 HOUR STORM

HUNSAKER & ASSOCIATES
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 1.20 207.84
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 3.00 519.60
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.200(In)
Area Averaged 100-Year Rainfall = 3.000(In)
Point rain (area averaged) = 1.941(In)
Areal adjustment factor = 99.94 %
Adjusted average point rain = 1.939(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 83.7 0.202 0.000 0.202 1.000 0.202 Sum (F) = 0.202
Area averaged mean soil loss (F) (In/Hr) = 0.202
Minimum soil loss rate ((In/Hr)) = 0.101
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.116 ( 0.202) 0.105 0.012 2 0.17 0.60 0.140 ( 0.202) 0.126 0.014 3 0.25 0.60 0.140 ( 0.202) 0.126 0.014 4 0.33 0.60 0.140 ( 0.202) 0.126 0.014 5 0.42 0.60 0.140 ( 0.202) 0.126 0.014 6 0.50 0.70 0.163 ( 0.202) 0.147 0.016 7 0.58 0.70 0.163 ( 0.202) 0.147 0.016 8 0.67 0.70 0.163 ( 0.202) 0.147 0.016 9 0.75 0.70 0.163 ( 0.202) 0.147 0.016 10 0.83 0.70 0.163 ( 0.202) 0.147 0.016 11 0.92 0.70 0.163 ( 0.202) 0.147 0.016 12 1.00 0.80 0.186 ( 0.202) 0.168 0.019 13 1.08 0.80 0.186 ( 0.202) 0.168 0.019 14 1.17 0.80 0.186 ( 0.202) 0.168 0.019 15 1.25 0.80 0.186 ( 0.202) 0.168 0.019 16 1.33 0.80 0.186 ( 0.202) 0.168 0.019 17 1.42 0.80 0.186 ( 0.202) 0.168 0.019 18 1.50 0.80 0.186 ( 0.202) 0.168 0.019 19 1.58 0.80 0.186 ( 0.202) 0.168 0.019 20 1.67 0.80 0.186 ( 0.202) 0.168 0.019 21 1.75 0.80 0.186 ( 0.202) 0.168 0.019 22 1.83 0.80 0.186 ( 0.202) 0.168 0.019 23 1.92 0.80 0.186 ( 0.202) 0.168 0.019 24 2.00 0.90 0.209 ( 0.202) 0.189 0.021 25 2.08 0.80 0.186 ( 0.202) 0.168 0.019 26 2.17 0.90 0.209 ( 0.202) 0.189 0.021 27 2.25 0.90 0.209 ( 0.202) 0.189 0.021 28 2.33 0.90 0.209 ( 0.202) 0.189 0.021 29 2.42 0.90 0.209 ( 0.202) 0.189 0.021 30 2.50 0.90 0.209 ( 0.202) 0.189 0.021 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
31 2.58 0.90 0.209 ( 0.202) 0.189 0.021 32 2.67 0.90 0.209 ( 0.202) 0.189 0.021 33 2.75 1.00 0.233 0.202 ( 0.209) 0.031 34 2.83 1.00 0.233 0.202 ( 0.209) 0.031 35 2.92 1.00 0.233 0.202 ( 0.209) 0.031 36 3.00 1.00 0.233 0.202 ( 0.209) 0.031 37 3.08 1.00 0.233 0.202 ( 0.209) 0.031 38 3.17 1.10 0.256 0.202 ( 0.230) 0.054 39 3.25 1.10 0.256 0.202 ( 0.230) 0.054 40 3.33 1.10 0.256 0.202 ( 0.230) 0.054 41 3.42 1.20 0.279 0.202 ( 0.251) 0.077 42 3.50 1.30 0.303 0.202 ( 0.272) 0.101 43 3.58 1.40 0.326 0.202 ( 0.293) 0.124 44 3.67 1.40 0.326 0.202 ( 0.293) 0.124 45 3.75 1.50 0.349 0.202 ( 0.314) 0.147 46 3.83 1.50 0.349 0.202 ( 0.314) 0.147 47 3.92 1.60 0.372 0.202 ( 0.335) 0.171 48 4.00 1.60 0.372 0.202 ( 0.335) 0.171 49 4.08 1.70 0.396 0.202 ( 0.356) 0.194 50 4.17 1.80 0.419 0.202 ( 0.377) 0.217 51 4.25 1.90 0.442 0.202 ( 0.398) 0.240 52 4.33 2.00 0.465 0.202 ( 0.419) 0.264 53 4.42 2.10 0.489 0.202 ( 0.440) 0.287 54 4.50 2.10 0.489 0.202 ( 0.440) 0.287 55 4.58 2.20 0.512 0.202 ( 0.461) 0.310 56 4.67 2.30 0.535 0.202 ( 0.482) 0.333 57 4.75 2.40 0.559 0.202 ( 0.503) 0.357 58 4.83 2.40 0.559 0.202 ( 0.503) 0.357 59 4.92 2.50 0.582 0.202 ( 0.524) 0.380 60 5.00 2.60 0.605 0.202 ( 0.545) 0.403 61 5.08 3.10 0.721 0.202 ( 0.649) 0.520 62 5.17 3.60 0.838 0.202 ( 0.754) 0.636 63 5.25 3.90 0.908 0.202 ( 0.817) 0.706 64 5.33 4.20 0.977 0.202 ( 0.880) 0.776 65 5.42 4.70 1.094 0.202 ( 0.984) 0.892 66 5.50 5.60 1.303 0.202 ( 1.173) 1.101 67 5.58 1.90 0.442 0.202 ( 0.398) 0.240 68 5.67 0.90 0.209 ( 0.202) 0.189 0.021 69 5.75 0.60 0.140 ( 0.202) 0.126 0.014 70 5.83 0.50 0.116 ( 0.202) 0.105 0.012 71 5.92 0.30 0.070 ( 0.202) 0.063 0.007 72 6.00 0.20 0.047 ( 0.202) 0.042 0.005 (Loss Rate Not Used)
Sum = 100.0 Sum = 10.5 Flood volume = Effective rainfall 0.88(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 12.6(Ac.Ft) Total soil loss = 1.06(In)
Total soil loss = 15.348(Ac.Ft)
Total rainfall = 1.94(In)
Flood volume = 550741.1 Cubic Feet
Total soil loss = 668577.7 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 140.069(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+ 5 0.0009 0.13 Q | | | | 0+10 0.0059 0.72 Q | | | | 0+15 0.0157 1.42 Q | | | | 0+20 0.0279 1.78 Q | | | | 0+25 0.0415 1.97 Q | | | | 0+30 0.0561 2.12 Q | | | | 0+35 0.0720 2.31 Q | | | | 0+40 0.0892 2.49 Q | | | | 0+45 0.1070 2.59 Q | | | | 0+50 0.1253 2.66 Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+55 0.1440 2.71 Q | | | | 1+ 0 0.1631 2.77 Q | | | | 1+ 5 0.1831 2.91 Q | | | | 1+10 0.2041 3.05 Q | | | | 1+15 0.2256 3.12 Q | | | | 1+20 0.2474 3.16 Q | | | | 1+25 0.2693 3.19 Q | | | | 1+30 0.2914 3.20 Q | | | | 1+35 0.3136 3.22 Q | | | | 1+40 0.3358 3.23 QV | | | | 1+45 0.3580 3.23 QV | | | | 1+50 0.3803 3.24 QV | | | | 1+55 0.4027 3.24 QV | | | | 2+ 0 0.4252 3.27 QV | | | | 2+ 5 0.4484 3.36 QV | | | | 2+10 0.4717 3.39 QV | | | | 2+15 0.4954 3.44 QV | | | | 2+20 0.5198 3.53 QV | | | | 2+25 0.5444 3.58 QV | | | | 2+30 0.5692 3.60 QV | | | | 2+35 0.5940 3.61 QV | | | | 2+40 0.6190 3.62 QV | | | | 2+45 0.6448 3.75 Q V | | | | 2+50 0.6740 4.24 Q V | | | | 2+55 0.7066 4.74 Q V | | | | 3+ 0 0.7407 4.96 Q V | | | | 3+ 5 0.7757 5.07 |QV | | | | 3+10 0.8130 5.42 |QV | | | | 3+15 0.8585 6.61 |QV | | | | 3+20 0.9124 7.82 |QV | | | | 3+25 0.9717 8.61 |Q V | | | | 3+30 1.0427 10.31 | QV | | | | 3+35 1.1327 13.07 | QV | | | | 3+40 1.2430 16.01 | Q | | | | 3+45 1.3692 18.32 | QV | | | | 3+50 1.5103 20.49 | Q | | | | 3+55 1.6658 22.58 | QV | | | | 4+ 0 1.8359 24.69 | QV | | | | 4+ 5 2.0200 26.73 | QV | | | | 4+10 2.2203 29.08 | Q V | | | | 4+15 2.4424 32.25 | QV | | | | 4+20 2.6888 35.77 | QV | | | | 4+25 2.9604 39.44 | Q V| | | | 4+30 3.2561 42.94 | Q V | | | 4+35 3.5705 45.65 | Q|V | | | 4+40 3.9039 48.40 | Q| V | | | 4+45 4.2609 51.84 | Q V | | | 4+50 4.6416 55.28 | |Q V | | | 4+55 5.0407 57.94 | |Q V | | | 5+ 0 5.4585 60.66 | | Q V | | | 5+ 5 5.9071 65.14 | | Q V | | | 5+10 6.4196 74.42 | | Q V | | 5+15 7.0251 87.91 | | Q | V | | 5+20 7.7223 101.23 | | Q V | | 5+25 8.5065 113.87 | | | Q V | | 5+30 9.3992 129.62 | | | Q V| | 5+35 10.3639 140.07 | | | Q | V | 5+40 11.1318 111.50 | | | Q | V | 5+45 11.5838 65.62 | | Q | | V | 5+50 11.8642 40.72 | Q | | | V | 5+55 12.0645 29.09 | Q | | | V | 6+ 0 12.2142 21.74 | Q | | | V | 6+ 5 12.3276 16.46 | Q | | | V| 6+10 12.4135 12.47 | Q | | | V| 6+15 12.4800 9.66 |Q | | | V| 6+20 12.5311 7.42 |Q | | | V| 6+25 12.5697 5.60 |Q | | | V| 6+30 12.5980 4.11 Q | | | V| 6+35 12.6182 2.93 Q | | | V| 6+40 12.6324 2.06 Q | | | V| 6+45 12.6406 1.19 Q | | | V| 6+50 12.6424 0.26 Q | | | V| 6+55 12.6428 0.06 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
7+ 0 12.6430 0.03 Q | | | V| 7+ 5 12.6432 0.02 Q | | | V| 7+10 12.6432 0.01 Q | | | V| 7+15 12.6433 0.00 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 11/08/21 File: EXA0102410.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 10 YEAR HOUR STORM

HUNSAKER & ASSOCIATES
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 Min.

Unit time = 15.00 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]
173.20 2.00 346.40
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 5.00 866.00
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 2.000(In)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Area Averaged 100-Year Rainfall = 5.000(In)
Point rain (area averaged) = 3.234(In)
Areal adjustment factor = 99.97 %
Adjusted average point rain = 3.233(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 83.7 0.202 0.000 0.202 1.000 0.202 Sum (F) = 0.202
Area averaged mean soil loss (F) (In/Hr) = 0.202
Minimum soil loss rate ((In/Hr)) = 0.101
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.250 155.929 34.579 60.360 2 0.500 311.858 46.572 81.293 3 0.750 467.787 10.847 18.934 4 1.000 623.715 4.704 8.211 5 1.250 779.644 2.305 4.023 6 1.500 935.573 0.992 1.732 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.25 0.20 0.026 ( 0.356) 0.023 0.003 2 0.50 0.30 0.039 ( 0.352) 0.035 0.004 3 0.75 0.30 0.039 ( 0.348) 0.035 0.004 4 1.00 0.40 0.052 ( 0.344) 0.047 0.005 5 1.25 0.30 0.039 ( 0.340) 0.035 0.004 6 1.50 0.30 0.039 ( 0.336) 0.035 0.004 7 1.75 0.30 0.039 ( 0.332) 0.035 0.004 8 2.00 0.40 0.052 ( 0.328) 0.047 0.005 9 2.25 0.40 0.052 ( 0.324) 0.047 0.005 10 2.50 0.40 0.052 ( 0.320) 0.047 0.005 11 2.75 0.50 0.065 ( 0.316) 0.058 0.006 12 3.00 0.50 0.065 ( 0.312) 0.058 0.006 13 3.25 0.50 0.065 ( 0.308) 0.058 0.006 14 3.50 0.50 0.065 ( 0.305) 0.058 0.006 15 3.75 0.50 0.065 ( 0.301) 0.058 0.006 16 4.00 0.60 0.078 ( 0.297) 0.070 0.008 17 4.25 0.60 0.078 ( 0.293) 0.070 0.008 18 4.50 0.70 0.091 ( 0.289) 0.081 0.009 19 4.75 0.70 0.091 ( 0.286) 0.081 0.009 20 5.00 0.80 0.103 ( 0.282) 0.093 0.010 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
21 5.25 0.60 0.078 ( 0.278) 0.070 0.008 22 5.50 0.70 0.091 ( 0.275) 0.081 0.009 23 5.75 0.80 0.103 ( 0.271) 0.093 0.010 24 6.00 0.80 0.103 ( 0.268) 0.093 0.010 25 6.25 0.90 0.116 ( 0.264) 0.105 0.012 26 6.50 0.90 0.116 ( 0.261) 0.105 0.012 27 6.75 1.00 0.129 ( 0.257) 0.116 0.013 28 7.00 1.00 0.129 ( 0.254) 0.116 0.013 29 7.25 1.00 0.129 ( 0.250) 0.116 0.013 30 7.50 1.10 0.142 ( 0.247) 0.128 0.014 31 7.75 1.20 0.155 ( 0.243) 0.140 0.016 32 8.00 1.30 0.168 ( 0.240) 0.151 0.017 33 8.25 1.50 0.194 ( 0.237) 0.175 0.019 34 8.50 1.50 0.194 ( 0.233) 0.175 0.019 35 8.75 1.60 0.207 ( 0.230) 0.186 0.021 36 9.00 1.70 0.220 ( 0.227) 0.198 0.022 37 9.25 1.90 0.246 ( 0.224) 0.221 0.025 38 9.50 2.00 0.259 0.220 ( 0.233) 0.038 39 9.75 2.10 0.272 0.217 ( 0.244) 0.054 40 10.00 2.20 0.285 0.214 ( 0.256) 0.070 41 10.25 1.50 0.194 ( 0.211) 0.175 0.019 42 10.50 1.50 0.194 ( 0.208) 0.175 0.019 43 10.75 2.00 0.259 0.205 ( 0.233) 0.054 44 11.00 2.00 0.259 0.202 ( 0.233) 0.057 45 11.25 1.90 0.246 0.199 ( 0.221) 0.047 46 11.50 1.90 0.246 0.196 ( 0.221) 0.050 47 11.75 1.70 0.220 0.193 ( 0.198) 0.027 48 12.00 1.80 0.233 0.190 ( 0.210) 0.042 49 12.25 2.50 0.323 0.187 ( 0.291) 0.136 50 12.50 2.60 0.336 0.185 ( 0.303) 0.152 51 12.75 2.80 0.362 0.182 ( 0.326) 0.180 52 13.00 2.90 0.375 0.179 ( 0.338) 0.196 53 13.25 3.40 0.440 0.176 ( 0.396) 0.263 54 13.50 3.40 0.440 0.174 ( 0.396) 0.266 55 13.75 2.30 0.297 0.171 ( 0.268) 0.126 56 14.00 2.30 0.297 0.169 ( 0.268) 0.129 57 14.25 2.70 0.349 0.166 ( 0.314) 0.183 58 14.50 2.60 0.336 0.163 ( 0.303) 0.173 59 14.75 2.60 0.336 0.161 ( 0.303) 0.175 60 15.00 2.50 0.323 0.158 ( 0.291) 0.165 61 15.25 2.40 0.310 0.156 ( 0.279) 0.154 62 15.50 2.30 0.297 0.154 ( 0.268) 0.144 63 15.75 1.90 0.246 0.151 ( 0.221) 0.094 64 16.00 1.90 0.246 0.149 ( 0.221) 0.097 65 16.25 0.40 0.052 ( 0.147) 0.047 0.005 66 16.50 0.40 0.052 ( 0.144) 0.047 0.005 67 16.75 0.30 0.039 ( 0.142) 0.035 0.004 68 17.00 0.30 0.039 ( 0.140) 0.035 0.004 69 17.25 0.50 0.065 ( 0.138) 0.058 0.006 70 17.50 0.50 0.065 ( 0.136) 0.058 0.006 71 17.75 0.50 0.065 ( 0.134) 0.058 0.006 72 18.00 0.40 0.052 ( 0.132) 0.047 0.005 73 18.25 0.40 0.052 ( 0.130) 0.047 0.005 74 18.50 0.40 0.052 ( 0.128) 0.047 0.005 75 18.75 0.30 0.039 ( 0.126) 0.035 0.004 76 19.00 0.20 0.026 ( 0.124) 0.023 0.003 77 19.25 0.30 0.039 ( 0.123) 0.035 0.004 78 19.50 0.40 0.052 ( 0.121) 0.047 0.005 79 19.75 0.30 0.039 ( 0.119) 0.035 0.004 80 20.00 0.20 0.026 ( 0.118) 0.023 0.003 81 20.25 0.30 0.039 ( 0.116) 0.035 0.004 82 20.50 0.30 0.039 ( 0.115) 0.035 0.004 83 20.75 0.30 0.039 ( 0.113) 0.035 0.004 84 21.00 0.20 0.026 ( 0.112) 0.023 0.003 85 21.25 0.30 0.039 ( 0.111) 0.035 0.004 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
86 21.50 0.20 0.026 ( 0.109) 0.023 0.003 87 21.75 0.30 0.039 ( 0.108) 0.035 0.004 88 22.00 0.20 0.026 ( 0.107) 0.023 0.003 89 22.25 0.30 0.039 ( 0.106) 0.035 0.004 90 22.50 0.20 0.026 ( 0.105) 0.023 0.003 91 22.75 0.20 0.026 ( 0.104) 0.023 0.003 92 23.00 0.20 0.026 ( 0.103) 0.023 0.003 93 23.25 0.20 0.026 ( 0.102) 0.023 0.003 94 23.50 0.20 0.026 ( 0.102) 0.023 0.003 95 23.75 0.20 0.026 ( 0.101) 0.023 0.003 96 24.00 0.20 0.026 ( 0.101) 0.023 0.003 (Loss Rate Not Used)
Sum = 100.0 Sum = 3.6 Flood volume = Effective rainfall 0.90(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 13.0(Ac.Ft) Total soil loss = 2.33(In)
Total soil loss = 33.651(Ac.Ft)
Total rainfall = 3.23(In)
Flood volume = 566901.3 Cubic Feet
Total soil loss = 1465819.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 43.514(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 15 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 12.5 25.0 37.5 50.0 ----------------------------------------------------------------------- 0+15 0.0032 0.16 Q | | | | 0+30 0.0124 0.44 Q | | | | 0+45 0.0248 0.60 Q | | | | 1+ 0 0.0397 0.72 Q | | | | 1+15 0.0556 0.77 Q | | | | 1+30 0.0701 0.70 Q | | | | 1+45 0.0843 0.69 Q | | | | 2+ 0 0.1000 0.76 Q | | | | 2+15 0.1179 0.86 Q | | | | 2+30 0.1362 0.89 Q | | | | 2+45 0.1563 0.97 Q | | | | 3+ 0 0.1787 1.08 Q | | | | 3+15 0.2017 1.11 Q | | | | 3+30 0.2248 1.12 Q | | | | 3+45 0.2481 1.13 Q | | | | 4+ 0 0.2731 1.21 Q | | | | 4+15 0.3002 1.31 VQ | | | | 4+30 0.3294 1.42 Q | | | | 4+45 0.3611 1.53 |Q | | | | 5+ 0 0.3949 1.64 |Q | | | | 5+15 0.4280 1.60 |Q | | | | 5+30 0.4589 1.50 |Q | | | | 5+45 0.4929 1.65 |Q | | | | 6+ 0 0.5293 1.76 |Q | | | | 6+15 0.5678 1.86 |Q | | | | 6+30 0.6087 1.98 |Q | | | | 6+45 0.6519 2.09 |QV | | | | 7+ 0 0.6975 2.21 |QV | | | | 7+15 0.7438 2.24 |QV | | | | 7+30 0.7919 2.33 |QV | | | | 7+45 0.8439 2.52 | Q | | | | 8+ 0 0.9003 2.73 | Q | | | | 8+15 0.9628 3.02 | Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
8+30 1.0304 3.27 | QV | | | | 8+45 1.1011 3.42 | QV | | | | 9+ 0 1.1761 3.63 | QV | | | | 9+15 1.2573 3.93 | Q | | | | 9+30 1.3608 5.00 | Q | | | | 9+45 1.5085 7.15 | VQ | | | | 10+ 0 1.7093 9.72 | V Q | | | | 10+15 1.8823 8.37 | VQ | | | | 10+30 1.9799 4.72 | Q V | | | | 10+45 2.1049 6.05 | Q V | | | | 11+ 0 2.2845 8.69 | QV | | | | 11+15 2.4665 8.81 | Q | | | | 11+30 2.6405 8.42 | Q V | | | | 11+45 2.7903 7.25 | Q V | | | | 12+ 0 2.9222 6.38 | Q V | | | | 12+15 3.1879 12.86 | VQ | | | 12+30 3.6323 21.51 | V Q | | | 12+45 4.1764 26.33 | | V |Q | | 13+ 0 4.8106 30.70 | | V | Q | | 13+15 5.5774 37.12 | | V | Q| | 13+30 6.4765 43.51 | | V| | Q | 13+45 7.2378 36.85 | | V Q| | 14+ 0 7.7825 26.37 | | |Q V | | 14+15 8.3514 27.53 | | | Q V | | 14+30 8.9784 30.35 | | | Q V | | 14+45 9.6013 30.15 | | | Q V| | 15+ 0 10.2157 29.74 | | | Q V | 15+15 10.8032 28.43 | | | Q | V | 15+30 11.3573 26.82 | | |Q | V | 15+45 11.8260 22.68 | | Q | | V | 16+ 0 12.2079 18.48 | | Q | | V | 16+15 12.4570 12.06 | Q| | | V | 16+30 12.5436 4.19 | Q | | | V | 16+45 12.5886 2.18 |Q | | | V | 17+ 0 12.6142 1.24 Q | | | V | 17+15 12.6351 1.01 Q | | | V | 17+30 12.6568 1.05 Q | | | V | 17+45 12.6795 1.10 Q | | | V | 18+ 0 12.7009 1.04 Q | | | V| 18+15 12.7203 0.94 Q | | | V| 18+30 12.7394 0.92 Q | | | V| 18+45 12.7566 0.83 Q | | | V| 19+ 0 12.7699 0.64 Q | | | V| 19+15 12.7821 0.59 Q | | | V| 19+30 12.7974 0.74 Q | | | V| 19+45 12.8134 0.77 Q | | | V| 20+ 0 12.8261 0.62 Q | | | V| 20+15 12.8381 0.58 Q | | | V| 20+30 12.8517 0.66 Q | | | V| 20+45 12.8656 0.67 Q | | | V| 21+ 0 12.8778 0.59 Q | | | V| 21+15 12.8896 0.57 Q | | | V| 21+30 12.9015 0.57 Q | | | V| 21+45 12.9131 0.56 Q | | | V| 22+ 0 12.9249 0.57 Q | | | V| 22+15 12.9364 0.56 Q | | | V| 22+30 12.9482 0.57 Q | | | V| 22+45 12.9582 0.48 Q | | | V| 23+ 0 12.9678 0.46 Q | | | V| 23+15 12.9772 0.46 Q | | | V| 23+30 12.9866 0.45 Q | | | V| 23+45 12.9959 0.45 Q | | | V| 24+ 0 13.0053 0.45 Q | | | V| 24+15 13.0114 0.30 Q | | | V| 24+30 13.0131 0.09 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
24+45 13.0139 0.04 Q | | | V| 25+ 0 13.0142 0.01 Q | | | V| 25+15 13.0143 0.00 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 100 Year - Pre-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA1001100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 100 YEAR 1 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 0.55 95.26
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 1.30 225.16
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 1.300(In)
Areal adjustment factor = 99.84 %
Adjusted average point rain = 1.298(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 93.2 0.088 0.000 0.088 1.000 0.088 Sum (F) = 0.088
Area averaged mean soil loss (F) (In/Hr) = 0.088
Minimum soil loss rate ((In/Hr)) = 0.044
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5300 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 3.40 0.530 0.088 ( 0.477) 0.441 2 0.17 4.70 0.732 0.088 ( 0.659) 0.644 3 0.25 4.70 0.732 0.088 ( 0.659) 0.644 4 0.33 5.10 0.794 0.088 ( 0.715) 0.706 5 0.42 5.80 0.903 0.088 ( 0.813) 0.815 6 0.50 5.90 0.919 0.088 ( 0.827) 0.831 7 0.58 7.10 1.106 0.088 ( 0.995) 1.018 8 0.67 8.70 1.355 0.088 ( 1.220) 1.267 9 0.75 13.20 2.056 0.088 ( 1.850) 1.968 10 0.83 29.70 4.626 0.088 ( 4.163) 4.538 11 0.92 7.70 1.199 0.088 ( 1.079) 1.111 12 1.00 4.00 0.623 0.088 ( 0.561) 0.535 (Loss Rate Not Used)
Sum = 100.0 Sum = 14.5 Flood volume = Effective rainfall 1.21(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 17.5(Ac.Ft) Total soil loss = 0.09(In)
Total soil loss = 1.272(Ac.Ft)
Total rainfall = 1.30(In)
Flood volume = 760632.9 Cubic Feet
Total soil loss = 55415.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 389.432(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
-------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 100.0 200.0 300.0 400.0 ----------------------------------------------------------------------- 0+ 5 0.0345 5.02 Q | | | | 0+10 0.2326 28.76 V Q | | | | 0+15 0.6502 60.64 |V Q | | | | 0+20 1.2076 80.93 | V Q | | | | 0+25 1.8594 94.64 | V Q| | | | 0+30 2.6109 109.12 | V Q | | | 0+35 3.4578 122.97 | V | Q | | | 0+40 4.4344 141.80 | V Q | | | 0+45 5.6435 175.57 | | V Q | | | 0+50 7.4240 258.52 | | V | Q | | 0+55 10.1060 389.43 | | | V | Q | 1+ 0 12.6278 366.16 | | | V | Q | 1+ 5 14.2032 228.74 | | | Q | V | 1+10 15.1621 139.23 | | Q | | V | 1+15 15.7675 87.91 | Q | | | V | 1+20 16.1960 62.21 | Q | | | V | 1+25 16.5154 46.39 | Q | | | V | 1+30 16.7560 34.93 | Q | | | V | 1+35 16.9473 27.77 | Q | | | V | 1+40 17.0955 21.52 | Q | | | V| 1+45 17.2100 16.63 |Q | | | V| 1+50 17.2970 12.63 |Q | | | V| 1+55 17.3621 9.45 Q | | | V| 2+ 0 17.4135 7.46 Q | | | V| 2+ 5 17.4492 5.19 Q | | | V| 2+10 17.4587 1.38 Q | | | V| 2+15 17.4617 0.43 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA1003100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 100 YEAR 3 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 0.85 147.22
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 2.00 346.40
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 2.000(In)
Areal adjustment factor = 99.92 %
Adjusted average point rain = 1.998(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 93.2 0.088 0.000 0.088 1.000 0.088 Sum (F) = 0.088
Area averaged mean soil loss (F) (In/Hr) = 0.088
Minimum soil loss rate ((In/Hr)) = 0.044
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.312 0.088 ( 0.281) 0.224 2 0.17 1.30 0.312 0.088 ( 0.281) 0.224 3 0.25 1.10 0.264 0.088 ( 0.237) 0.176 4 0.33 1.50 0.360 0.088 ( 0.324) 0.272 5 0.42 1.50 0.360 0.088 ( 0.324) 0.272 6 0.50 1.80 0.432 0.088 ( 0.389) 0.344 7 0.58 1.50 0.360 0.088 ( 0.324) 0.272 8 0.67 1.80 0.432 0.088 ( 0.389) 0.344 9 0.75 1.80 0.432 0.088 ( 0.389) 0.344 10 0.83 1.50 0.360 0.088 ( 0.324) 0.272 11 0.92 1.60 0.384 0.088 ( 0.345) 0.296 12 1.00 1.80 0.432 0.088 ( 0.389) 0.344 13 1.08 2.20 0.528 0.088 ( 0.475) 0.439 14 1.17 2.20 0.528 0.088 ( 0.475) 0.439 15 1.25 2.20 0.528 0.088 ( 0.475) 0.439 16 1.33 2.00 0.480 0.088 ( 0.432) 0.391 17 1.42 2.60 0.624 0.088 ( 0.561) 0.535 18 1.50 2.70 0.648 0.088 ( 0.583) 0.559 19 1.58 2.40 0.576 0.088 ( 0.518) 0.487 20 1.67 2.70 0.648 0.088 ( 0.583) 0.559 21 1.75 3.30 0.791 0.088 ( 0.712) 0.703 22 1.83 3.10 0.743 0.088 ( 0.669) 0.655 23 1.92 2.90 0.695 0.088 ( 0.626) 0.607 24 2.00 3.00 0.719 0.088 ( 0.648) 0.631 25 2.08 3.10 0.743 0.088 ( 0.669) 0.655 26 2.17 4.20 1.007 0.088 ( 0.907) 0.919 27 2.25 5.00 1.199 0.088 ( 1.079) 1.111 28 2.33 3.50 0.839 0.088 ( 0.755) 0.751 29 2.42 6.80 1.631 0.088 ( 1.468) 1.543 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
30 2.50 7.30 1.751 0.088 ( 1.576) 1.663 31 2.58 8.20 1.967 0.088 ( 1.770) 1.878 32 2.67 5.90 1.415 0.088 ( 1.273) 1.327 33 2.75 2.00 0.480 0.088 ( 0.432) 0.391 34 2.83 1.80 0.432 0.088 ( 0.389) 0.344 35 2.92 1.80 0.432 0.088 ( 0.389) 0.344 36 3.00 0.60 0.144 0.088 ( 0.130) 0.056 (Loss Rate Not Used)
Sum = 100.0 Sum = 20.8 Flood volume = Effective rainfall 1.73(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 25.0(Ac.Ft) Total soil loss = 0.26(In)
Total soil loss = 3.816(Ac.Ft)
Total rainfall = 2.00(In)
Flood volume = 1090234.1 Cubic Feet
Total soil loss = 166245.1 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 256.532(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 75.0 150.0 225.0 300.0 ----------------------------------------------------------------------- 0+ 5 0.0175 2.54 Q | | | | 0+10 0.1098 13.40 VQ | | | | 0+15 0.2753 24.03 V Q | | | | 0+20 0.4652 27.58 V Q | | | | 0+25 0.6886 32.43 |V Q | | | | 0+30 0.9559 38.81 |V Q | | | | 0+35 1.2609 44.29 | V Q | | | | 0+40 1.5839 46.90 | V Q | | | | 0+45 1.9251 49.54 | V Q | | | | 0+50 2.2871 52.56 | V Q | | | | 0+55 2.6408 51.36 | V Q | | | | 1+ 0 2.9899 50.69 | V Q | | | | 1+ 5 3.3665 54.68 | V Q | | | | 1+10 3.7942 62.09 | V Q | | | | 1+15 4.2638 68.19 | V Q| | | | 1+20 4.7491 70.47 | V Q| | | | 1+25 5.2403 71.31 | VQ| | | | 1+30 5.7725 77.28 | VQ | | | 1+35 6.3551 84.60 | VQ | | | 1+40 6.9489 86.22 | |Q | | | 1+45 7.5686 89.98 | |QV | | | 1+50 8.2569 99.94 | | Q | | | 1+55 8.9876 106.09 | | Q | | | 2+ 0 9.7159 105.76 | | QV | | | 2+ 5 10.4471 106.16 | | Q V | | | 2+10 11.2165 111.72 | | Q V | | | 2+15 12.1037 128.81 | | Q V| | | 2+20 13.1251 148.31 | | QV | | 2+25 14.1977 155.74 | | Q V | | 2+30 15.4735 185.25 | | | Q | | 2+35 17.0581 230.09 | | | V Q | 2+40 18.8249 256.53 | | | V Q | 2+45 20.4857 241.14 | | | | Q | 2+50 21.7234 179.71 | | | Q | V | 2+55 22.5966 126.80 | | Q | | V | 3+ 0 23.2894 100.59 | | Q | | V | 3+ 5 23.7977 73.80 | Q| | | V | 3+10 24.1339 48.81 | Q | | | V | 3+15 24.3700 34.28 | Q | | | V | 3+20 24.5477 25.82 | Q | | | V| 3+25 24.6849 19.91 | Q | | | V| 3+30 24.7885 15.04 | Q | | | V| 3+35 24.8662 11.28 |Q | | | V| 3+40 24.9263 8.73 |Q | | | V| 3+45 24.9694 6.26 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
3+50 24.9985 4.22 Q | | | V| 3+55 25.0142 2.29 Q | | | V| 4+ 0 25.0213 1.03 Q | | | V| 4+ 5 25.0258 0.64 Q | | | V| 4+10 25.0280 0.33 Q | | | V| 4+15 25.0283 0.05 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: EXA1006100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 100 YEAR 6 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 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]
173.20 1.20 207.84
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 3.00 519.60
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 1.200(In)
Area Averaged 100-Year Rainfall = 3.000(In)
Point rain (area averaged) = 3.000(In)
Areal adjustment factor = 99.94 %
Adjusted average point rain = 2.998(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 93.2 0.088 0.000 0.088 1.000 0.088 Sum (F) = 0.088
Area averaged mean soil loss (F) (In/Hr) = 0.088
Minimum soil loss rate ((In/Hr)) = 0.044
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.180 0.088 ( 0.162) 0.092 2 0.17 0.60 0.216 0.088 ( 0.194) 0.128 3 0.25 0.60 0.216 0.088 ( 0.194) 0.128 4 0.33 0.60 0.216 0.088 ( 0.194) 0.128 5 0.42 0.60 0.216 0.088 ( 0.194) 0.128 6 0.50 0.70 0.252 0.088 ( 0.227) 0.164 7 0.58 0.70 0.252 0.088 ( 0.227) 0.164 8 0.67 0.70 0.252 0.088 ( 0.227) 0.164 9 0.75 0.70 0.252 0.088 ( 0.227) 0.164 10 0.83 0.70 0.252 0.088 ( 0.227) 0.164 11 0.92 0.70 0.252 0.088 ( 0.227) 0.164 12 1.00 0.80 0.288 0.088 ( 0.259) 0.200 13 1.08 0.80 0.288 0.088 ( 0.259) 0.200 14 1.17 0.80 0.288 0.088 ( 0.259) 0.200 15 1.25 0.80 0.288 0.088 ( 0.259) 0.200 16 1.33 0.80 0.288 0.088 ( 0.259) 0.200 17 1.42 0.80 0.288 0.088 ( 0.259) 0.200 18 1.50 0.80 0.288 0.088 ( 0.259) 0.200 19 1.58 0.80 0.288 0.088 ( 0.259) 0.200 20 1.67 0.80 0.288 0.088 ( 0.259) 0.200 21 1.75 0.80 0.288 0.088 ( 0.259) 0.200 22 1.83 0.80 0.288 0.088 ( 0.259) 0.200 23 1.92 0.80 0.288 0.088 ( 0.259) 0.200 24 2.00 0.90 0.324 0.088 ( 0.291) 0.236 25 2.08 0.80 0.288 0.088 ( 0.259) 0.200 26 2.17 0.90 0.324 0.088 ( 0.291) 0.236 27 2.25 0.90 0.324 0.088 ( 0.291) 0.236 28 2.33 0.90 0.324 0.088 ( 0.291) 0.236 29 2.42 0.90 0.324 0.088 ( 0.291) 0.236 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
30 2.50 0.90 0.324 0.088 ( 0.291) 0.236 31 2.58 0.90 0.324 0.088 ( 0.291) 0.236 32 2.67 0.90 0.324 0.088 ( 0.291) 0.236 33 2.75 1.00 0.360 0.088 ( 0.324) 0.272 34 2.83 1.00 0.360 0.088 ( 0.324) 0.272 35 2.92 1.00 0.360 0.088 ( 0.324) 0.272 36 3.00 1.00 0.360 0.088 ( 0.324) 0.272 37 3.08 1.00 0.360 0.088 ( 0.324) 0.272 38 3.17 1.10 0.396 0.088 ( 0.356) 0.308 39 3.25 1.10 0.396 0.088 ( 0.356) 0.308 40 3.33 1.10 0.396 0.088 ( 0.356) 0.308 41 3.42 1.20 0.432 0.088 ( 0.389) 0.344 42 3.50 1.30 0.468 0.088 ( 0.421) 0.380 43 3.58 1.40 0.504 0.088 ( 0.453) 0.416 44 3.67 1.40 0.504 0.088 ( 0.453) 0.416 45 3.75 1.50 0.540 0.088 ( 0.486) 0.452 46 3.83 1.50 0.540 0.088 ( 0.486) 0.452 47 3.92 1.60 0.576 0.088 ( 0.518) 0.488 48 4.00 1.60 0.576 0.088 ( 0.518) 0.488 49 4.08 1.70 0.612 0.088 ( 0.550) 0.523 50 4.17 1.80 0.648 0.088 ( 0.583) 0.559 51 4.25 1.90 0.684 0.088 ( 0.615) 0.595 52 4.33 2.00 0.720 0.088 ( 0.648) 0.631 53 4.42 2.10 0.756 0.088 ( 0.680) 0.667 54 4.50 2.10 0.756 0.088 ( 0.680) 0.667 55 4.58 2.20 0.792 0.088 ( 0.712) 0.703 56 4.67 2.30 0.828 0.088 ( 0.745) 0.739 57 4.75 2.40 0.863 0.088 ( 0.777) 0.775 58 4.83 2.40 0.863 0.088 ( 0.777) 0.775 59 4.92 2.50 0.899 0.088 ( 0.810) 0.811 60 5.00 2.60 0.935 0.088 ( 0.842) 0.847 61 5.08 3.10 1.115 0.088 ( 1.004) 1.027 62 5.17 3.60 1.295 0.088 ( 1.166) 1.207 63 5.25 3.90 1.403 0.088 ( 1.263) 1.315 64 5.33 4.20 1.511 0.088 ( 1.360) 1.423 65 5.42 4.70 1.691 0.088 ( 1.522) 1.603 66 5.50 5.60 2.015 0.088 ( 1.813) 1.927 67 5.58 1.90 0.684 0.088 ( 0.615) 0.595 68 5.67 0.90 0.324 0.088 ( 0.291) 0.236 69 5.75 0.60 0.216 0.088 ( 0.194) 0.128 70 5.83 0.50 0.180 0.088 ( 0.162) 0.092 71 5.92 0.30 0.108 0.088 ( 0.097) 0.020 72 6.00 0.20 0.072 ( 0.088) 0.065 0.007 (Loss Rate Not Used)
Sum = 100.0 Sum = 29.7 Flood volume = Effective rainfall 2.47(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 35.7(Ac.Ft) Total soil loss = 0.53(In)
Total soil loss = 7.605(Ac.Ft)
Total rainfall = 3.00(In)
Flood volume = 1553759.7 Cubic Feet
Total soil loss = 331265.3 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 255.639(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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 75.0 150.0 225.0 300.0 ----------------------------------------------------------------------- 0+ 5 0.0072 1.04 Q | | | | 0+10 0.0479 5.91 Q | | | | 0+15 0.1321 12.24 VQ | | | | 0+20 0.2424 16.00 V Q | | | | 0+25 0.3652 17.84 V Q | | | | 0+30 0.4988 19.40 V Q | | | | 0+35 0.6501 21.97 V Q | | | | 0+40 0.8179 24.37 V Q | | | | 0+45 0.9942 25.59 |V Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+50 1.1757 26.37 |V Q | | | | 0+55 1.3613 26.95 |V Q | | | | 1+ 0 1.5527 27.79 |V Q | | | | 1+ 5 1.7584 29.87 |V Q | | | | 1+10 1.9782 31.92 | V Q | | | | 1+15 2.2049 32.90 | V Q | | | | 1+20 2.4356 33.50 | V Q | | | | 1+25 2.6689 33.88 | V Q | | | | 1+30 2.9040 34.13 | VQ | | | | 1+35 3.1404 34.32 | VQ | | | | 1+40 3.3778 34.47 | VQ | | | | 1+45 3.6160 34.60 | Q | | | | 1+50 3.8548 34.67 | Q | | | | 1+55 4.0940 34.73 | Q | | | | 2+ 0 4.3364 35.19 | Q | | | | 2+ 5 4.5882 36.56 | QV | | | | 2+10 4.8433 37.05 | QV | | | | 2+15 5.1037 37.80 | Q | | | | 2+20 5.3740 39.24 | QV | | | | 2+25 5.6487 39.89 | QV | | | | 2+30 5.9257 40.22 | QV | | | | 2+35 6.2043 40.46 | QV | | | | 2+40 6.4841 40.63 | Q V | | | | 2+45 6.7677 41.18 | Q V | | | | 2+50 7.0640 43.01 | Q V | | | | 2+55 7.3731 44.89 | Q V | | | | 3+ 0 7.6881 45.73 | Q V | | | | 3+ 5 8.0062 46.19 | Q V | | | | 3+10 8.3294 46.93 | Q V| | | | 3+15 8.6663 48.92 | Q V| | | | 3+20 9.0167 50.88 | Q V | | | 3+25 9.3762 52.20 | Q V | | | 3+30 9.7541 54.87 | Q V | | | 3+35 10.1618 59.19 | Q |V | | | 3+40 10.6010 63.77 | Q |V | | | 3+45 11.0649 67.37 | Q | V | | | 3+50 11.5521 70.74 | Q| V | | | 3+55 12.0617 73.99 | Q| V | | | 4+ 0 12.5939 77.27 | Q V | | | 4+ 5 13.1478 80.43 | Q V | | | 4+10 13.7267 84.06 | |Q V | | | 4+15 14.3393 88.96 | |Q V | | | 4+20 14.9894 94.39 | | Q V | | | 4+25 15.6786 100.07 | | Q V | | | 4+30 16.4051 105.48 | | Q V | | | 4+35 17.1604 109.68 | | Q V| | | 4+40 17.9450 113.93 | | Q V | | 4+45 18.7663 119.25 | | Q |V | | 4+50 19.6241 124.55 | | Q | V | | 4+55 20.5103 128.67 | | Q | V | | 5+ 0 21.4254 132.87 | | Q | V | | 5+ 5 22.3882 139.80 | | Q | V | | 5+10 23.4498 154.15 | | Q V | | 5+15 24.6551 175.01 | | | Q V | | 5+20 26.0022 195.60 | | | Q V| | 5+25 27.4839 215.14 | | | Q V | 5+30 29.1332 239.49 | | | |QV | 5+35 30.8938 255.64 | | | | Q | 5+40 32.3487 211.25 | | | Q | V | 5+45 33.3005 138.20 | | Q | | V | 5+50 33.9451 93.60 | | Q | | V | 5+55 34.4136 68.02 | Q| | | V | 6+ 0 34.7542 49.46 | Q | | | V | 6+ 5 34.9997 35.65 | Q | | | V| 6+10 35.1813 26.37 | Q | | | V| 6+15 35.3202 20.17 | Q | | | V| 6+20 35.4263 15.40 | Q | | | V| 6+25 35.5064 11.64 |Q | | | V| 6+30 35.5657 8.60 |Q | | | V| 6+35 35.6084 6.21 Q | | | V| 6+40 35.6387 4.40 Q | | | V| 6+45 35.6573 2.70 Q | | | V| 6+50 35.6641 0.98 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
6+55 35.6671 0.43 Q | | | V| 7+ 0 35.6685 0.21 Q | | | V| 7+ 5 35.6692 0.10 Q | | | V| 7+10 35.6694 0.02 Q | | | V| 7+15 35.6694 0.01 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 11/08/21 File: EXA10024100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 100 YEAR HOUR STORM

HUNSAKER & ASSOCIATES,
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 Min.

Unit time = 15.00 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]
173.20 2.00 346.40
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 5.00 866.00
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 2.000(In)
Area Averaged 100-Year Rainfall = 5.000(In)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Point rain (area averaged) = 5.000(In)
Areal adjustment factor = 99.97 %
Adjusted average point rain = 4.998(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 93.2 0.088 0.000 0.088 1.000 0.088 Sum (F) = 0.088
Area averaged mean soil loss (F) (In/Hr) = 0.088
Minimum soil loss rate ((In/Hr)) = 0.044
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.250 155.929 34.579 60.360 2 0.500 311.858 46.572 81.293 3 0.750 467.787 10.847 18.934 4 1.000 623.715 4.704 8.211 5 1.250 779.644 2.305 4.023 6 1.500 935.573 0.992 1.732 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- 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 0.25 0.20 0.040 ( 0.156) 0.036 0.004 2 0.50 0.30 0.060 ( 0.154) 0.054 0.006 3 0.75 0.30 0.060 ( 0.152) 0.054 0.006 4 1.00 0.40 0.080 ( 0.150) 0.072 0.008 5 1.25 0.30 0.060 ( 0.148) 0.054 0.006 6 1.50 0.30 0.060 ( 0.147) 0.054 0.006 7 1.75 0.30 0.060 ( 0.145) 0.054 0.006 8 2.00 0.40 0.080 ( 0.143) 0.072 0.008 9 2.25 0.40 0.080 ( 0.141) 0.072 0.008 10 2.50 0.40 0.080 ( 0.140) 0.072 0.008 11 2.75 0.50 0.100 ( 0.138) 0.090 0.010 12 3.00 0.50 0.100 ( 0.136) 0.090 0.010 13 3.25 0.50 0.100 ( 0.135) 0.090 0.010 14 3.50 0.50 0.100 ( 0.133) 0.090 0.010 15 3.75 0.50 0.100 ( 0.131) 0.090 0.010 16 4.00 0.60 0.120 ( 0.130) 0.108 0.012 17 4.25 0.60 0.120 ( 0.128) 0.108 0.012 18 4.50 0.70 0.140 ( 0.126) 0.126 0.014 19 4.75 0.70 0.140 0.125 ( 0.126) 0.015 20 5.00 0.80 0.160 0.123 ( 0.144) 0.037 21 5.25 0.60 0.120 ( 0.122) 0.108 0.012 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
22 5.50 0.70 0.140 0.120 ( 0.126) 0.020 23 5.75 0.80 0.160 0.118 ( 0.144) 0.042 24 6.00 0.80 0.160 0.117 ( 0.144) 0.043 25 6.25 0.90 0.180 0.115 ( 0.162) 0.065 26 6.50 0.90 0.180 0.114 ( 0.162) 0.066 27 6.75 1.00 0.200 0.112 ( 0.180) 0.088 28 7.00 1.00 0.200 0.111 ( 0.180) 0.089 29 7.25 1.00 0.200 0.109 ( 0.180) 0.091 30 7.50 1.10 0.220 0.108 ( 0.198) 0.112 31 7.75 1.20 0.240 0.106 ( 0.216) 0.134 32 8.00 1.30 0.260 0.105 ( 0.234) 0.155 33 8.25 1.50 0.300 0.103 ( 0.270) 0.197 34 8.50 1.50 0.300 0.102 ( 0.270) 0.198 35 8.75 1.60 0.320 0.100 ( 0.288) 0.219 36 9.00 1.70 0.340 0.099 ( 0.306) 0.241 37 9.25 1.90 0.380 0.098 ( 0.342) 0.282 38 9.50 2.00 0.400 0.096 ( 0.360) 0.304 39 9.75 2.10 0.420 0.095 ( 0.378) 0.325 40 10.00 2.20 0.440 0.094 ( 0.396) 0.346 41 10.25 1.50 0.300 0.092 ( 0.270) 0.208 42 10.50 1.50 0.300 0.091 ( 0.270) 0.209 43 10.75 2.00 0.400 0.090 ( 0.360) 0.310 44 11.00 2.00 0.400 0.088 ( 0.360) 0.312 45 11.25 1.90 0.380 0.087 ( 0.342) 0.293 46 11.50 1.90 0.380 0.086 ( 0.342) 0.294 47 11.75 1.70 0.340 0.084 ( 0.306) 0.256 48 12.00 1.80 0.360 0.083 ( 0.324) 0.277 49 12.25 2.50 0.500 0.082 ( 0.450) 0.418 50 12.50 2.60 0.520 0.081 ( 0.468) 0.439 51 12.75 2.80 0.560 0.079 ( 0.504) 0.480 52 13.00 2.90 0.580 0.078 ( 0.522) 0.502 53 13.25 3.40 0.680 0.077 ( 0.612) 0.603 54 13.50 3.40 0.680 0.076 ( 0.612) 0.604 55 13.75 2.30 0.460 0.075 ( 0.414) 0.385 56 14.00 2.30 0.460 0.074 ( 0.414) 0.386 57 14.25 2.70 0.540 0.072 ( 0.486) 0.467 58 14.50 2.60 0.520 0.071 ( 0.468) 0.448 59 14.75 2.60 0.520 0.070 ( 0.468) 0.450 60 15.00 2.50 0.500 0.069 ( 0.450) 0.431 61 15.25 2.40 0.480 0.068 ( 0.432) 0.412 62 15.50 2.30 0.460 0.067 ( 0.414) 0.393 63 15.75 1.90 0.380 0.066 ( 0.342) 0.314 64 16.00 1.90 0.380 0.065 ( 0.342) 0.315 65 16.25 0.40 0.080 0.064 ( 0.072) 0.016 66 16.50 0.40 0.080 0.063 ( 0.072) 0.017 67 16.75 0.30 0.060 ( 0.062) 0.054 0.006 68 17.00 0.30 0.060 ( 0.061) 0.054 0.006 69 17.25 0.50 0.100 0.060 ( 0.090) 0.040 70 17.50 0.50 0.100 0.059 ( 0.090) 0.041 71 17.75 0.50 0.100 0.058 ( 0.090) 0.041 72 18.00 0.40 0.080 0.058 ( 0.072) 0.022 73 18.25 0.40 0.080 0.057 ( 0.072) 0.023 74 18.50 0.40 0.080 0.056 ( 0.072) 0.024 75 18.75 0.30 0.060 ( 0.055) 0.054 0.006 76 19.00 0.20 0.040 ( 0.054) 0.036 0.004 77 19.25 0.30 0.060 0.054 ( 0.054) 0.006 78 19.50 0.40 0.080 0.053 ( 0.072) 0.027 79 19.75 0.30 0.060 0.052 ( 0.054) 0.008 80 20.00 0.20 0.040 ( 0.051) 0.036 0.004 81 20.25 0.30 0.060 0.051 ( 0.054) 0.009 82 20.50 0.30 0.060 0.050 ( 0.054) 0.010 83 20.75 0.30 0.060 0.049 ( 0.054) 0.011 84 21.00 0.20 0.040 ( 0.049) 0.036 0.004 85 21.25 0.30 0.060 0.048 ( 0.054) 0.012 86 21.50 0.20 0.040 ( 0.048) 0.036 0.004 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
87 21.75 0.30 0.060 0.047 ( 0.054) 0.013 88 22.00 0.20 0.040 ( 0.047) 0.036 0.004 89 22.25 0.30 0.060 0.046 ( 0.054) 0.014 90 22.50 0.20 0.040 ( 0.046) 0.036 0.004 91 22.75 0.20 0.040 ( 0.045) 0.036 0.004 92 23.00 0.20 0.040 ( 0.045) 0.036 0.004 93 23.25 0.20 0.040 ( 0.045) 0.036 0.004 94 23.50 0.20 0.040 ( 0.044) 0.036 0.004 95 23.75 0.20 0.040 ( 0.044) 0.036 0.004 96 24.00 0.20 0.040 ( 0.044) 0.036 0.004 (Loss Rate Not Used)
Sum = 100.0 Sum = 12.8 Flood volume = Effective rainfall 3.21(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 46.3(Ac.Ft) Total soil loss = 1.79(In)
Total soil loss = 25.820(Ac.Ft)
Total rainfall = 5.00(In)
Flood volume = 2017804.7 Cubic Feet
Total soil loss = 1124711.9 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 101.432(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 15 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+15 0.0050 0.24 Q | | | | 0+30 0.0192 0.69 Q | | | | 0+45 0.0383 0.93 Q | | | | 1+ 0 0.0614 1.12 Q | | | | 1+15 0.0860 1.19 Q | | | | 1+30 0.1084 1.08 Q | | | | 1+45 0.1304 1.06 Q | | | | 2+ 0 0.1547 1.18 Q | | | | 2+15 0.1822 1.33 Q | | | | 2+30 0.2105 1.37 Q | | | | 2+45 0.2416 1.51 Q | | | | 3+ 0 0.2763 1.68 Q | | | | 3+15 0.3118 1.72 Q | | | | 3+30 0.3476 1.73 Q | | | | 3+45 0.3836 1.74 Q | | | | 4+ 0 0.4222 1.87 Q | | | | 4+15 0.4641 2.03 Q | | | | 4+30 0.5093 2.19 Q | | | | 4+45 0.5596 2.44 Q | | | | 5+ 0 0.6399 3.88 Q | | | | 5+15 0.7264 4.19 Q | | | | 5+30 0.7900 3.08 Q | | | | 5+45 0.8880 4.75 Q | | | | 6+ 0 1.0250 6.63 VQ | | | | 6+15 1.2000 8.47 Q | | | | 6+30 1.4172 10.51 |VQ | | | | 6+45 1.6745 12.46 |VQ | | | | 7+ 0 1.9751 14.55 |VQ | | | | 7+15 2.2907 15.27 |V Q | | | | 7+30 2.6407 16.94 | VQ | | | | 7+45 3.0563 20.12 | V Q | | | | 8+ 0 3.5443 23.62 | VQ | | | | 8+15 4.1323 28.46 | V Q | | | | 8+30 4.8057 32.59 | V Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
8+45 5.5306 35.09 | V Q | | | | 9+ 0 6.3283 38.61 | V Q | | | | 9+15 7.2265 43.47 | V Q | | | | 9+30 8.2346 48.79 | V Q| | | | 9+45 9.3270 52.87 | V Q | | | 10+ 0 10.4998 56.77 | V|Q | | | 10+15 11.5518 50.92 | VQ | | | 10+30 12.3878 40.46 | Q V | | | 10+45 13.3043 44.36 | Q V | | | 11+ 0 14.3722 51.69 | Q V | | | 11+15 15.4481 52.07 | Q V | | | 11+30 16.5071 51.25 | Q V | | | 11+45 17.5212 49.09 | Q| V | | | 12+ 0 18.4979 47.27 | Q| V | | | 12+15 19.6700 56.73 | |Q V | | | 12+30 21.1070 69.55 | | Q V | | | 12+45 22.6868 76.46 | | Q V| | | 13+ 0 24.3950 82.67 | | Q V | | 13+15 26.2971 92.06 | | Q | V | | 13+30 28.3928 101.43 | | Q V | | 13+45 30.2649 90.61 | | Q | V | | 14+ 0 31.7916 73.89 | | Q | V | | 14+15 33.3452 75.19 | | Q | V | | 14+30 34.9785 79.05 | | Q | V | 14+45 36.5952 78.25 | | Q | V | 15+ 0 38.1887 77.13 | | Q | | V | 15+15 39.7309 74.64 | | Q | | V | 15+30 41.2117 71.67 | | Q | | V | 15+45 42.5509 64.82 | | Q | | V | 16+ 0 43.7466 57.87 | |Q | | V | 16+15 44.5346 38.14 | Q | | | V | 16+30 44.8063 13.15 | Q | | | V | 16+45 44.9420 6.57 |Q | | | V | 17+ 0 45.0062 3.11 Q | | | V | 17+15 45.0837 3.75 Q | | | V | 17+30 45.2064 5.94 |Q | | | V| 17+45 45.3440 6.66 |Q | | | V| 18+ 0 45.4650 5.85 |Q | | | V| 18+15 45.5581 4.51 Q | | | V| 18+30 45.6477 4.34 Q | | | V| 18+45 45.7134 3.18 Q | | | V| 19+ 0 45.7451 1.54 Q | | | V| 19+15 45.7690 1.16 Q | | | V| 19+30 45.8190 2.42 Q | | | V| 19+45 45.8790 2.90 Q | | | V| 20+ 0 45.9095 1.47 Q | | | V| 20+15 45.9361 1.29 Q | | | V| 20+30 45.9694 1.61 Q | | | V| 20+45 46.0051 1.73 Q | | | V| 21+ 0 46.0338 1.39 Q | | | V| 21+15 46.0619 1.36 Q | | | V| 21+30 46.0911 1.41 Q | | | V| 21+45 46.1202 1.41 Q | | | V| 22+ 0 46.1510 1.49 Q | | | V| 22+15 46.1817 1.48 Q | | | V| 22+30 46.2142 1.58 Q | | | V| 22+45 46.2332 0.92 Q | | | V| 23+ 0 46.2496 0.79 Q | | | V| 23+15 46.2649 0.74 Q | | | V| 23+30 46.2796 0.72 Q | | | V| 23+45 46.2941 0.70 Q | | | V| 24+ 0 46.3085 0.70 Q | | | V| 24+15 46.3179 0.46 Q | | | V| 24+30 46.3206 0.13 Q | | | V| 24+45 46.3218 0.06 Q | | | V| Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
25+ 0 46.3223 0.02 Q | | | V| 25+15 46.3224 0.01 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 2 Year - Post-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra00212.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 2 YEAR 1 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.55 53.82
100 YEAR Area rainfall data:

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

97.86 1.30 127.22
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 0.550(In)
Areal adjustment factor = 99.91 %
Adjusted average point rain = 0.550(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 51.6 0.556 0.442 0.335 1.000 0.335 Sum (F) = 0.335
Area averaged mean soil loss (F) (In/Hr) = 0.335
Minimum soil loss rate ((In/Hr)) = 0.167
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5200 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 4.10 0.270 ( 0.335) 0.148 0.123 2 0.17 4.60 0.303 ( 0.335) 0.166 0.138 3 0.25 4.50 0.297 ( 0.335) 0.162 0.135 4 0.33 4.90 0.323 ( 0.335) 0.177 0.147 5 0.42 5.50 0.363 ( 0.335) 0.198 0.165 6 0.50 6.40 0.422 ( 0.335) 0.231 0.191 7 0.58 7.10 0.468 ( 0.335) 0.256 0.212 8 0.67 9.00 0.593 ( 0.335) 0.324 0.269 9 0.75 12.90 0.851 0.335 ( 0.465) 0.516 10 0.83 29.50 1.945 0.335 ( 1.063) 1.611 11 0.92 7.00 0.462 ( 0.335) 0.252 0.209 12 1.00 4.50 0.297 ( 0.335) 0.162 0.135 (Loss Rate Not Used)
Sum = 100.0 Sum = 3.8 Flood volume = Effective rainfall 0.32(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 2.6(Ac.Ft) Total soil loss = 0.23(In)
Total soil loss = 1.865(Ac.Ft)
Total rainfall = 0.55(In)
Flood volume = 113968.4 Cubic Feet
Total soil loss = 81235.9 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 90.443(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 25.0 50.0 75.0 100.0 ----------------------------------------------------------------------- 0+ 5 0.0127 1.84 Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+10 0.0656 7.68 |V Q | | | | 0+15 0.1381 10.52 | V Q | | | | 0+20 0.2192 11.78 | VQ | | | | 0+25 0.3102 13.21 | VQ | | | | 0+30 0.4138 15.05 | Q | | | | 0+35 0.5329 17.29 | Q V | | | | 0+40 0.6704 19.96 | Q V | | | 0+45 0.8569 27.09 | Q V | | | 0+50 1.2448 56.31 | | V| Q | | 0+55 1.8676 90.44 | | | V | Q | 1+ 0 2.1919 47.08 | | Q | | V | 1+ 5 2.3736 26.38 | Q | | V | 1+10 2.4694 13.92 | Q | | | V | 1+15 2.5265 8.29 | Q | | | V | 1+20 2.5643 5.50 | Q | | | V| 1+25 2.5888 3.55 |Q | | | V| 1+30 2.6047 2.31 Q | | | V| 1+35 2.6141 1.36 Q | | | V| 1+40 2.6158 0.25 Q | | | V| 1+45 2.6164 0.08 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra00232.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 2 YEAR 3 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.85 83.18
100 YEAR Area rainfall data:

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

97.86 2.00 195.72
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 0.850(In)
Areal adjustment factor = 99.96 %
Adjusted average point rain = 0.850(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 51.6 0.556 0.442 0.335 1.000 0.335 Sum (F) = 0.335
Area averaged mean soil loss (F) (In/Hr) = 0.335
Minimum soil loss rate ((In/Hr)) = 0.167
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.133 ( 0.335) 0.072 0.060 2 0.17 1.30 0.133 ( 0.335) 0.072 0.060 3 0.25 1.10 0.112 ( 0.335) 0.061 0.051 4 0.33 1.50 0.153 ( 0.335) 0.084 0.069 5 0.42 1.50 0.153 ( 0.335) 0.084 0.069 6 0.50 1.80 0.184 ( 0.335) 0.100 0.083 7 0.58 1.50 0.153 ( 0.335) 0.084 0.069 8 0.67 1.80 0.184 ( 0.335) 0.100 0.083 9 0.75 1.80 0.184 ( 0.335) 0.100 0.083 10 0.83 1.50 0.153 ( 0.335) 0.084 0.069 11 0.92 1.60 0.163 ( 0.335) 0.089 0.074 12 1.00 1.80 0.184 ( 0.335) 0.100 0.083 13 1.08 2.20 0.224 ( 0.335) 0.123 0.102 14 1.17 2.20 0.224 ( 0.335) 0.123 0.102 15 1.25 2.20 0.224 ( 0.335) 0.123 0.102 16 1.33 2.00 0.204 ( 0.335) 0.111 0.093 17 1.42 2.60 0.265 ( 0.335) 0.145 0.120 18 1.50 2.70 0.275 ( 0.335) 0.150 0.125 19 1.58 2.40 0.245 ( 0.335) 0.134 0.111 20 1.67 2.70 0.275 ( 0.335) 0.150 0.125 21 1.75 3.30 0.336 ( 0.335) 0.184 0.153 22 1.83 3.10 0.316 ( 0.335) 0.173 0.143 23 1.92 2.90 0.296 ( 0.335) 0.162 0.134 24 2.00 3.00 0.306 ( 0.335) 0.167 0.139 25 2.08 3.10 0.316 ( 0.335) 0.173 0.143 26 2.17 4.20 0.428 ( 0.335) 0.234 0.194 27 2.25 5.00 0.510 ( 0.335) 0.279 0.231 28 2.33 3.50 0.357 ( 0.335) 0.195 0.162 29 2.42 6.80 0.693 0.335 ( 0.379) 0.359 30 2.50 7.30 0.744 0.335 ( 0.407) 0.410 31 2.58 8.20 0.836 0.335 ( 0.457) 0.501 32 2.67 5.90 0.602 ( 0.335) 0.329 0.273 33 2.75 2.00 0.204 ( 0.335) 0.111 0.093 34 2.83 1.80 0.184 ( 0.335) 0.100 0.083 35 2.92 1.80 0.184 ( 0.335) 0.100 0.083 36 3.00 0.60 0.061 ( 0.335) 0.033 0.028 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
(Loss Rate Not Used)
Sum = 100.0 Sum = 4.9 Flood volume = Effective rainfall 0.41(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 3.3(Ac.Ft) Total soil loss = 0.44(In)
Total soil loss = 3.623(Ac.Ft)
Total rainfall = 0.85(In)
Flood volume = 143985.5 Cubic Feet
Total soil loss = 157832.2 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 39.346(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 10.0 20.0 30.0 40.0 ----------------------------------------------------------------------- 0+ 5 0.0062 0.90 Q | | | | 0+10 0.0314 3.66 V Q | | | | 0+15 0.0631 4.59 V Q | | | | 0+20 0.0969 4.91 |V Q | | | | 0+25 0.1373 5.87 |V Q | | | | 0+30 0.1821 6.51 | V Q | | | | 0+35 0.2314 7.16 | V Q | | | | 0+40 0.2804 7.11 | V Q | | | | 0+45 0.3334 7.70 | V Q | | | | 0+50 0.3868 7.75 | V Q | | | | 0+55 0.4370 7.29 | V Q | | | | 1+ 0 0.4884 7.45 | V Q | | | | 1+ 5 0.5446 8.17 | V Q | | | | 1+10 0.6079 9.18 | V Q| | | | 1+15 0.6738 9.58 | VQ| | | | 1+20 0.7400 9.61 | VQ| | | | 1+25 0.8070 9.72 | Q| | | | 1+30 0.8824 10.96 | Q | | | 1+35 0.9611 11.43 | |Q | | | 1+40 1.0389 11.29 | |QV | | | 1+45 1.1233 12.26 | | QV | | | 1+50 1.2171 13.62 | | QV | | | 1+55 1.3112 13.66 | | Q V | | | 2+ 0 1.4035 13.41 | | Q V | | | 2+ 5 1.4973 13.62 | | Q V | | | 2+10 1.5984 14.68 | | Q V| | | 2+15 1.7202 17.68 | | Q V | | 2+20 1.8530 19.29 | | Q| V | | 2+25 1.9919 20.16 | | Q V | | 2+30 2.1932 29.24 | | | V Q| | 2+35 2.4429 36.25 | | | V| Q | 2+40 2.7139 39.35 | | | | V Q| 2+45 2.9140 29.05 | | | Q| V | 2+50 3.0381 18.02 | | Q | | V | 2+55 3.1313 13.54 | | Q | | V | 3+ 0 3.2049 10.69 | Q | | V | 3+ 5 3.2502 6.57 | Q | | | V| 3+10 3.2749 3.58 | Q | | | V| 3+15 3.2892 2.08 | Q | | | V| 3+20 3.2975 1.21 |Q | | | V| 3+25 3.3016 0.61 Q | | | V| 3+30 3.3037 0.30 Q | | | V| 3+35 3.3048 0.16 Q | | | V| 3+40 3.3053 0.08 Q | | | V| 3+45 3.3055 0.02 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra00262.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 2 YEAR 6 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 1.20 117.43
100 YEAR Area rainfall data:

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

97.86 3.00 293.58
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.200(In)
Area Averaged 100-Year Rainfall = 3.000(In)
Point rain (area averaged) = 1.200(In)
Areal adjustment factor = 99.97 %
Adjusted average point rain = 1.200(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 51.6 0.556 0.442 0.335 1.000 0.335 Sum (F) = 0.335
Area averaged mean soil loss (F) (In/Hr) = 0.335
Minimum soil loss rate ((In/Hr)) = 0.167
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.072 ( 0.335) 0.039 0.033 2 0.17 0.60 0.086 ( 0.335) 0.047 0.039 3 0.25 0.60 0.086 ( 0.335) 0.047 0.039 4 0.33 0.60 0.086 ( 0.335) 0.047 0.039 5 0.42 0.60 0.086 ( 0.335) 0.047 0.039 6 0.50 0.70 0.101 ( 0.335) 0.055 0.046 7 0.58 0.70 0.101 ( 0.335) 0.055 0.046 8 0.67 0.70 0.101 ( 0.335) 0.055 0.046 9 0.75 0.70 0.101 ( 0.335) 0.055 0.046 10 0.83 0.70 0.101 ( 0.335) 0.055 0.046 11 0.92 0.70 0.101 ( 0.335) 0.055 0.046 12 1.00 0.80 0.115 ( 0.335) 0.063 0.052 13 1.08 0.80 0.115 ( 0.335) 0.063 0.052 14 1.17 0.80 0.115 ( 0.335) 0.063 0.052 15 1.25 0.80 0.115 ( 0.335) 0.063 0.052 16 1.33 0.80 0.115 ( 0.335) 0.063 0.052 17 1.42 0.80 0.115 ( 0.335) 0.063 0.052 18 1.50 0.80 0.115 ( 0.335) 0.063 0.052 19 1.58 0.80 0.115 ( 0.335) 0.063 0.052 20 1.67 0.80 0.115 ( 0.335) 0.063 0.052 21 1.75 0.80 0.115 ( 0.335) 0.063 0.052 22 1.83 0.80 0.115 ( 0.335) 0.063 0.052 23 1.92 0.80 0.115 ( 0.335) 0.063 0.052 24 2.00 0.90 0.130 ( 0.335) 0.071 0.059 25 2.08 0.80 0.115 ( 0.335) 0.063 0.052 26 2.17 0.90 0.130 ( 0.335) 0.071 0.059 27 2.25 0.90 0.130 ( 0.335) 0.071 0.059 28 2.33 0.90 0.130 ( 0.335) 0.071 0.059 29 2.42 0.90 0.130 ( 0.335) 0.071 0.059 30 2.50 0.90 0.130 ( 0.335) 0.071 0.059 31 2.58 0.90 0.130 ( 0.335) 0.071 0.059 32 2.67 0.90 0.130 ( 0.335) 0.071 0.059 33 2.75 1.00 0.144 ( 0.335) 0.079 0.065 34 2.83 1.00 0.144 ( 0.335) 0.079 0.065 35 2.92 1.00 0.144 ( 0.335) 0.079 0.065 36 3.00 1.00 0.144 ( 0.335) 0.079 0.065 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
37 3.08 1.00 0.144 ( 0.335) 0.079 0.065 38 3.17 1.10 0.158 ( 0.335) 0.087 0.072 39 3.25 1.10 0.158 ( 0.335) 0.087 0.072 40 3.33 1.10 0.158 ( 0.335) 0.087 0.072 41 3.42 1.20 0.173 ( 0.335) 0.094 0.078 42 3.50 1.30 0.187 ( 0.335) 0.102 0.085 43 3.58 1.40 0.202 ( 0.335) 0.110 0.091 44 3.67 1.40 0.202 ( 0.335) 0.110 0.091 45 3.75 1.50 0.216 ( 0.335) 0.118 0.098 46 3.83 1.50 0.216 ( 0.335) 0.118 0.098 47 3.92 1.60 0.230 ( 0.335) 0.126 0.104 48 4.00 1.60 0.230 ( 0.335) 0.126 0.104 49 4.08 1.70 0.245 ( 0.335) 0.134 0.111 50 4.17 1.80 0.259 ( 0.335) 0.142 0.118 51 4.25 1.90 0.274 ( 0.335) 0.149 0.124 52 4.33 2.00 0.288 ( 0.335) 0.157 0.131 53 4.42 2.10 0.302 ( 0.335) 0.165 0.137 54 4.50 2.10 0.302 ( 0.335) 0.165 0.137 55 4.58 2.20 0.317 ( 0.335) 0.173 0.144 56 4.67 2.30 0.331 ( 0.335) 0.181 0.150 57 4.75 2.40 0.345 ( 0.335) 0.189 0.157 58 4.83 2.40 0.345 ( 0.335) 0.189 0.157 59 4.92 2.50 0.360 ( 0.335) 0.197 0.163 60 5.00 2.60 0.374 ( 0.335) 0.204 0.170 61 5.08 3.10 0.446 ( 0.335) 0.244 0.202 62 5.17 3.60 0.518 ( 0.335) 0.283 0.235 63 5.25 3.90 0.561 ( 0.335) 0.307 0.255 64 5.33 4.20 0.605 ( 0.335) 0.330 0.274 65 5.42 4.70 0.677 0.335 ( 0.370) 0.342 66 5.50 5.60 0.806 0.335 ( 0.440) 0.472 67 5.58 1.90 0.274 ( 0.335) 0.149 0.124 68 5.67 0.90 0.130 ( 0.335) 0.071 0.059 69 5.75 0.60 0.086 ( 0.335) 0.047 0.039 70 5.83 0.50 0.072 ( 0.335) 0.039 0.033 71 5.92 0.30 0.043 ( 0.335) 0.024 0.020 72 6.00 0.20 0.029 ( 0.335) 0.016 0.013 (Loss Rate Not Used)
Sum = 100.0 Sum = 6.7 Flood volume = Effective rainfall 0.56(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 4.5(Ac.Ft) Total soil loss = 0.64(In)
Total soil loss = 5.249(Ac.Ft)
Total rainfall = 1.20(In)
Flood volume = 197498.9 Cubic Feet
Total soil loss = 228635.9 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 34.395(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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 10.0 20.0 30.0 40.0 ----------------------------------------------------------------------- 0+ 5 0.0034 0.49 Q | | | | 0+10 0.0177 2.08 V Q | | | | 0+15 0.0382 2.97 V Q | | | | 0+20 0.0611 3.34 V Q | | | | 0+25 0.0855 3.54 V Q | | | | 0+30 0.1114 3.76 V Q | | | | 0+35 0.1399 4.14 |V Q | | | | 0+40 0.1696 4.31 |V Q | | | | 0+45 0.1999 4.40 |V Q | | | | 0+50 0.2306 4.46 | V Q | | | | 0+55 0.2614 4.48 | V Q | | | | 1+ 0 0.2931 4.59 | V Q | | | | 1+ 5 0.3268 4.90 | V Q | | | | 1+10 0.3614 5.02 | V Q | | | | 1+15 0.3963 5.08 | V Q | | | | 1+20 0.4315 5.11 | V Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
1+25 0.4668 5.12 | VQ | | | | 1+30 0.5022 5.14 | VQ | | | | 1+35 0.5376 5.15 | VQ | | | | 1+40 0.5731 5.15 | Q | | | | 1+45 0.6086 5.16 | Q | | | | 1+50 0.6441 5.16 | Q | | | | 1+55 0.6796 5.16 | Q | | | | 2+ 0 0.7158 5.25 | QV | | | | 2+ 5 0.7533 5.45 | QV | | | | 2+10 0.7903 5.37 | QV | | | | 2+15 0.8289 5.60 | Q V | | | | 2+20 0.8682 5.70 | Q V | | | | 2+25 0.9077 5.74 | Q V | | | | 2+30 0.9474 5.76 | Q V | | | | 2+35 0.9872 5.78 | Q V | | | | 2+40 1.0270 5.79 | Q V| | | | 2+45 1.0676 5.89 | Q V| | | | 2+50 1.1102 6.19 | Q V| | | | 2+55 1.1537 6.31 | Q V | | | 3+ 0 1.1976 6.36 | Q V | | | 3+ 5 1.2416 6.39 | Q V | | | 3+10 1.2864 6.51 | Q |V | | | 3+15 1.3334 6.82 | Q |V | | | 3+20 1.3813 6.95 | Q | V | | | 3+25 1.4302 7.10 | Q | V | | | 3+30 1.4821 7.53 | Q | V | | | 3+35 1.5376 8.07 | Q | V | | | 3+40 1.5965 8.55 | Q | V | | | 3+45 1.6574 8.85 | Q | V | | | 3+50 1.7212 9.25 | Q| V | | | 3+55 1.7868 9.53 | Q| V | | | 4+ 0 1.8552 9.92 | Q| V | | | 4+ 5 1.9254 10.20 | Q V | | | 4+10 1.9990 10.68 | Q V | | | 4+15 2.0764 11.25 | |Q V | | | 4+20 2.1580 11.84 | |Q V| | | 4+25 2.2438 12.46 | | Q V| | | 4+30 2.3332 12.98 | | Q V | | 4+35 2.4249 13.32 | | Q |V | | 4+40 2.5202 13.84 | | Q | V | | 4+45 2.6196 14.43 | | Q | V | | 4+50 2.7225 14.94 | | Q | V | | 4+55 2.8277 15.27 | | Q | V | | 5+ 0 2.9364 15.79 | | Q | V | | 5+ 5 3.0519 16.76 | | Q | V | | 5+10 3.1824 18.96 | | Q | V | | 5+15 3.3301 21.44 | | |Q V| | 5+20 3.4922 23.54 | | | Q V | 5+25 3.6730 26.25 | | | Q | V | 5+30 3.8938 32.06 | | | | Q V | 5+35 4.1307 34.40 | | | | Q V | 5+40 4.2726 20.61 | | Q | V | 5+45 4.3593 12.59 | | Q | | V | 5+50 4.4188 8.64 | Q | | | V | 5+55 4.4620 6.28 | Q | | | V| 6+ 0 4.4924 4.40 | Q | | | V| 6+ 5 4.5123 2.89 | Q | | | V| 6+10 4.5230 1.56 |Q | | | V| 6+15 4.5288 0.84 Q | | | V| 6+20 4.5313 0.36 Q | | | V| 6+25 4.5326 0.19 Q | | | V| 6+30 4.5334 0.11 Q | | | V| 6+35 4.5337 0.05 Q | | | V| 6+40 4.5339 0.02 Q | | | V| 6+45 4.5340 0.01 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 11/08/21 File: PRA002242.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 2 YEAR HOUR STORM

HUNSAKER & ASSOCIATES, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 Min.

Unit time = 15.00 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]

97.86 2.00 195.72
100 YEAR Area rainfall data:

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

97.86 5.00 489.30
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 2.000(In)
Area Averaged 100-Year Rainfall = 5.000(In)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Point rain (area averaged) = 2.000(In)
Areal adjustment factor = 99.98 %
Adjusted average point rain = 2.000(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 51.6 0.556 0.442 0.335 1.000 0.335 Sum (F) = 0.335
Area averaged mean soil loss (F) (In/Hr) = 0.335
Minimum soil loss rate ((In/Hr)) = 0.167
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.250 260.360 52.212 51.493 2 0.500 520.720 39.421 38.879 3 0.750 781.080 6.693 6.601 4 1.000 1041.441 1.674 1.651 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.25 0.20 0.016 ( 0.591) 0.009 0.007 2 0.50 0.30 0.024 ( 0.584) 0.013 0.011 3 0.75 0.30 0.024 ( 0.577) 0.013 0.011 4 1.00 0.40 0.032 ( 0.570) 0.017 0.015 5 1.25 0.30 0.024 ( 0.564) 0.013 0.011 6 1.50 0.30 0.024 ( 0.557) 0.013 0.011 7 1.75 0.30 0.024 ( 0.550) 0.013 0.011 8 2.00 0.40 0.032 ( 0.544) 0.017 0.015 9 2.25 0.40 0.032 ( 0.537) 0.017 0.015 10 2.50 0.40 0.032 ( 0.531) 0.017 0.015 11 2.75 0.50 0.040 ( 0.524) 0.022 0.018 12 3.00 0.50 0.040 ( 0.518) 0.022 0.018 13 3.25 0.50 0.040 ( 0.511) 0.022 0.018 14 3.50 0.50 0.040 ( 0.505) 0.022 0.018 15 3.75 0.50 0.040 ( 0.499) 0.022 0.018 16 4.00 0.60 0.048 ( 0.492) 0.026 0.022 17 4.25 0.60 0.048 ( 0.486) 0.026 0.022 18 4.50 0.70 0.056 ( 0.480) 0.031 0.025 19 4.75 0.70 0.056 ( 0.474) 0.031 0.025 20 5.00 0.80 0.064 ( 0.468) 0.035 0.029 21 5.25 0.60 0.048 ( 0.462) 0.026 0.022 22 5.50 0.70 0.056 ( 0.456) 0.031 0.025 23 5.75 0.80 0.064 ( 0.450) 0.035 0.029 24 6.00 0.80 0.064 ( 0.444) 0.035 0.029 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
25 6.25 0.90 0.072 ( 0.438) 0.039 0.033 26 6.50 0.90 0.072 ( 0.432) 0.039 0.033 27 6.75 1.00 0.080 ( 0.426) 0.044 0.036 28 7.00 1.00 0.080 ( 0.420) 0.044 0.036 29 7.25 1.00 0.080 ( 0.415) 0.044 0.036 30 7.50 1.10 0.088 ( 0.409) 0.048 0.040 31 7.75 1.20 0.096 ( 0.403) 0.052 0.044 32 8.00 1.30 0.104 ( 0.398) 0.057 0.047 33 8.25 1.50 0.120 ( 0.392) 0.066 0.054 34 8.50 1.50 0.120 ( 0.387) 0.066 0.054 35 8.75 1.60 0.128 ( 0.381) 0.070 0.058 36 9.00 1.70 0.136 ( 0.376) 0.074 0.062 37 9.25 1.90 0.152 ( 0.371) 0.083 0.069 38 9.50 2.00 0.160 ( 0.365) 0.087 0.073 39 9.75 2.10 0.168 ( 0.360) 0.092 0.076 40 10.00 2.20 0.176 ( 0.355) 0.096 0.080 41 10.25 1.50 0.120 ( 0.350) 0.066 0.054 42 10.50 1.50 0.120 ( 0.345) 0.066 0.054 43 10.75 2.00 0.160 ( 0.340) 0.087 0.073 44 11.00 2.00 0.160 ( 0.335) 0.087 0.073 45 11.25 1.90 0.152 ( 0.330) 0.083 0.069 46 11.50 1.90 0.152 ( 0.325) 0.083 0.069 47 11.75 1.70 0.136 ( 0.320) 0.074 0.062 48 12.00 1.80 0.144 ( 0.315) 0.079 0.065 49 12.25 2.50 0.200 ( 0.311) 0.109 0.091 50 12.50 2.60 0.208 ( 0.306) 0.114 0.094 51 12.75 2.80 0.224 ( 0.302) 0.122 0.102 52 13.00 2.90 0.232 ( 0.297) 0.127 0.105 53 13.25 3.40 0.272 ( 0.292) 0.149 0.123 54 13.50 3.40 0.272 ( 0.288) 0.149 0.123 55 13.75 2.30 0.184 ( 0.284) 0.101 0.083 56 14.00 2.30 0.184 ( 0.279) 0.101 0.083 57 14.25 2.70 0.216 ( 0.275) 0.118 0.098 58 14.50 2.60 0.208 ( 0.271) 0.114 0.094 59 14.75 2.60 0.208 ( 0.267) 0.114 0.094 60 15.00 2.50 0.200 ( 0.263) 0.109 0.091 61 15.25 2.40 0.192 ( 0.259) 0.105 0.087 62 15.50 2.30 0.184 ( 0.255) 0.101 0.083 63 15.75 1.90 0.152 ( 0.251) 0.083 0.069 64 16.00 1.90 0.152 ( 0.247) 0.083 0.069 65 16.25 0.40 0.032 ( 0.243) 0.017 0.015 66 16.50 0.40 0.032 ( 0.239) 0.017 0.015 67 16.75 0.30 0.024 ( 0.236) 0.013 0.011 68 17.00 0.30 0.024 ( 0.232) 0.013 0.011 69 17.25 0.50 0.040 ( 0.229) 0.022 0.018 70 17.50 0.50 0.040 ( 0.225) 0.022 0.018 71 17.75 0.50 0.040 ( 0.222) 0.022 0.018 72 18.00 0.40 0.032 ( 0.219) 0.017 0.015 73 18.25 0.40 0.032 ( 0.215) 0.017 0.015 74 18.50 0.40 0.032 ( 0.212) 0.017 0.015 75 18.75 0.30 0.024 ( 0.209) 0.013 0.011 76 19.00 0.20 0.016 ( 0.206) 0.009 0.007 77 19.25 0.30 0.024 ( 0.203) 0.013 0.011 78 19.50 0.40 0.032 ( 0.201) 0.017 0.015 79 19.75 0.30 0.024 ( 0.198) 0.013 0.011 80 20.00 0.20 0.016 ( 0.195) 0.009 0.007 81 20.25 0.30 0.024 ( 0.193) 0.013 0.011 82 20.50 0.30 0.024 ( 0.190) 0.013 0.011 83 20.75 0.30 0.024 ( 0.188) 0.013 0.011 84 21.00 0.20 0.016 ( 0.185) 0.009 0.007 85 21.25 0.30 0.024 ( 0.183) 0.013 0.011 86 21.50 0.20 0.016 ( 0.181) 0.009 0.007 87 21.75 0.30 0.024 ( 0.179) 0.013 0.011 88 22.00 0.20 0.016 ( 0.177) 0.009 0.007 89 22.25 0.30 0.024 ( 0.175) 0.013 0.011 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
90 22.50 0.20 0.016 ( 0.174) 0.009 0.007 91 22.75 0.20 0.016 ( 0.172) 0.009 0.007 92 23.00 0.20 0.016 ( 0.171) 0.009 0.007 93 23.25 0.20 0.016 ( 0.170) 0.009 0.007 94 23.50 0.20 0.016 ( 0.169) 0.009 0.007 95 23.75 0.20 0.016 ( 0.168) 0.009 0.007 96 24.00 0.20 0.016 ( 0.167) 0.009 0.007 (Loss Rate Not Used)
Sum = 100.0 Sum = 3.6 Flood volume = Effective rainfall 0.91(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 7.4(Ac.Ft) Total soil loss = 1.09(In)
Total soil loss = 8.909(Ac.Ft)
Total rainfall = 2.00(In)
Flood volume = 322261.5 Cubic Feet
Total soil loss = 388066.3 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 12.019(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 15 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 5.0 10.0 15.0 20.0 ----------------------------------------------------------------------- 0+15 0.0077 0.37 Q | | | | 0+30 0.0251 0.84 VQ | | | | 0+45 0.0465 1.03 V Q | | | | 1+ 0 0.0724 1.26 V Q | | | | 1+15 0.0975 1.22 V Q | | | | 1+30 0.1202 1.10 V Q | | | | 1+45 0.1425 1.08 V Q | | | | 2+ 0 0.1686 1.26 V Q | | | | 2+15 0.1976 1.40 VQ | | | | 2+30 0.2270 1.43 |VQ | | | | 2+45 0.2605 1.62 |V Q | | | | 3+ 0 0.2969 1.76 |V Q | | | | 3+15 0.3337 1.78 |V Q | | | | 3+30 0.3707 1.79 | VQ | | | | 3+45 0.4077 1.79 | VQ | | | | 4+ 0 0.4486 1.98 | VQ | | | | 4+15 0.4923 2.12 | V Q | | | | 4+30 0.5404 2.33 | V Q | | | | 4+45 0.5916 2.48 | VQ | | | | 5+ 0 0.6471 2.69 | V Q | | | | 5+15 0.6980 2.46 | VQ | | | | 5+30 0.7473 2.39 | Q | | | | 5+45 0.8026 2.68 | VQ | | | | 6+ 0 0.8611 2.83 | VQ | | | | 6+15 0.9240 3.05 | V Q | | | | 6+30 0.9900 3.19 | VQ | | | | 6+45 1.0603 3.40 | VQ | | | | 7+ 0 1.1336 3.55 | VQ | | | | 7+15 1.2075 3.57 | VQ | | | | 7+30 1.2853 3.77 | VQ | | | | 7+45 1.3700 4.10 | VQ | | | | 8+ 0 1.4619 4.45 | VQ | | | | 8+15 1.5650 4.99 | VQ| | | | 8+30 1.6746 5.31 | VQ | | | 8+45 1.7892 5.55 | V|Q | | | 9+ 0 1.9108 5.89 | VQ | | | 9+15 2.0436 6.43 | VQ | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
9+30 2.1866 6.92 | |V Q | | | 9+45 2.3376 7.31 | | V Q | | | 10+ 0 2.4961 7.67 | | V Q | | | 10+15 2.6311 6.53 | | QV | | | 10+30 2.7462 5.57 | |Q V | | | 10+45 2.8774 6.35 | | Q V | | | 11+ 0 3.0223 7.01 | | Q V | | | 11+15 3.1657 6.94 | | Q V | | | 11+30 3.3069 6.83 | | Q V | | | 11+45 3.4399 6.44 | | Q V | | | 12+ 0 3.5708 6.33 | | Q V| | | 12+15 3.7306 7.74 | | Q V | | 12+30 3.9149 8.92 | | Q V | | 12+45 4.1135 9.61 | | Q| V | | 13+ 0 4.3232 10.15 | | Q V | | 13+15 4.5562 11.28 | | | Q V | | 13+30 4.8045 12.02 | | | QV | | 13+45 5.0129 10.09 | | Q V | | 14+ 0 5.1899 8.57 | | Q | V | | 14+15 5.3769 9.05 | | Q | V| | 14+30 5.5703 9.36 | | Q | V | 14+45 5.7627 9.32 | | Q | V | 15+ 0 5.9513 9.13 | | Q | | V | 15+15 6.1331 8.79 | | Q | | V | 15+30 6.3075 8.44 | | Q | | V | 15+45 6.4629 7.52 | | Q | | V | 16+ 0 6.6061 6.93 | | Q | | V | 16+15 6.6892 4.02 | Q | | | V | 16+30 6.7281 1.88 | Q | | | V | 16+45 6.7557 1.34 | Q | | | V | 17+ 0 6.7785 1.10 | Q | | | V | 17+15 6.8085 1.45 | Q | | | V | 17+30 6.8443 1.73 | Q | | | V | 17+45 6.8810 1.78 | Q | | | V | 18+ 0 6.9142 1.60 | Q | | | V | 18+15 6.9444 1.46 | Q | | | V | 18+30 6.9741 1.44 | Q | | | V | 18+45 6.9998 1.25 | Q | | | V | 19+ 0 7.0188 0.92 |Q | | | V | 19+15 7.0382 0.94 |Q | | | V | 19+30 7.0637 1.24 | Q | | | V | 19+45 7.0887 1.21 | Q | | | V | 20+ 0 7.1076 0.91 |Q | | | V | 20+15 7.1270 0.94 |Q | | | V | 20+30 7.1487 1.05 | Q | | | V | 20+45 7.1707 1.07 | Q | | | V | 21+ 0 7.1891 0.89 |Q | | | V | 21+15 7.2083 0.93 |Q | | | V | 21+30 7.2262 0.86 |Q | | | V| 21+45 7.2453 0.93 |Q | | | V| 22+ 0 7.2632 0.86 |Q | | | V| 22+15 7.2823 0.93 |Q | | | V| 22+30 7.3002 0.86 |Q | | | V| 22+45 7.3154 0.74 |Q | | | V| 23+ 0 7.3304 0.72 |Q | | | V| 23+15 7.3452 0.72 |Q | | | V| 23+30 7.3600 0.72 |Q | | | V| 23+45 7.3748 0.72 |Q | | | V| 24+ 0 7.3895 0.72 |Q | | | V| 24+15 7.3966 0.34 Q | | | V| 24+30 7.3979 0.06 Q | | | V| 24+45 7.3981 0.01 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 10 Year - Post-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra010110.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 10 YEAR 1 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.55 53.82
100 YEAR Area rainfall data:

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

97.86 1.30 127.22
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 0.859(In)
Areal adjustment factor = 99.91 %
Adjusted average point rain = 0.858(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 70.5 0.356 0.442 0.214 1.000 0.214 Sum (F) = 0.214
Area averaged mean soil loss (F) (In/Hr) = 0.214
Minimum soil loss rate ((In/Hr)) = 0.107
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5200 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 4.10 0.422 0.214 ( 0.231) 0.208 2 0.17 4.60 0.474 0.214 ( 0.259) 0.259 3 0.25 4.50 0.463 0.214 ( 0.253) 0.249 4 0.33 4.90 0.504 0.214 ( 0.276) 0.290 5 0.42 5.50 0.566 0.214 ( 0.309) 0.352 6 0.50 6.40 0.659 0.214 ( 0.360) 0.444 7 0.58 7.10 0.731 0.214 ( 0.399) 0.516 8 0.67 9.00 0.926 0.214 ( 0.506) 0.712 9 0.75 12.90 1.328 0.214 ( 0.725) 1.113 10 0.83 29.50 3.037 0.214 ( 1.659) 2.822 11 0.92 7.00 0.721 0.214 ( 0.394) 0.506 12 1.00 4.50 0.463 0.214 ( 0.253) 0.249 (Loss Rate Not Used)
Sum = 100.0 Sum = 7.7 Flood volume = Effective rainfall 0.64(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 5.2(Ac.Ft) Total soil loss = 0.21(In)
Total soil loss = 1.749(Ac.Ft)
Total rainfall = 0.86(In)
Flood volume = 228550.2 Cubic Feet
Total soil loss = 76165.7 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 167.324(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 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+ 5 0.0215 3.12 Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+10 0.1138 13.40 V Q | | | | 0+15 0.2468 19.32 |V Q | | | | 0+20 0.3983 21.99 | VQ | | | | 0+25 0.5771 25.96 | VQ | | | | 0+30 0.7952 31.67 | Q | | | | 0+35 1.0633 38.93 | QV | | | | 0+40 1.3927 47.84 | QV | | | 0+45 1.8436 65.46 | | QV | | | 0+50 2.6317 114.43 | | V Q | | 0+55 3.7840 167.32 | | | V | Q | 1+ 0 4.4212 92.51 | | Q | | V | 1+ 5 4.7756 51.45 | Q | | V | 1+10 4.9622 27.10 | Q | | | V | 1+15 5.0737 16.19 | Q | | | V | 1+20 5.1471 10.67 | Q | | | V| 1+25 5.1945 6.88 |Q | | | V| 1+30 5.2247 4.38 Q | | | V| 1+35 5.2421 2.52 Q | | | V| 1+40 5.2457 0.53 Q | | | V| 1+45 5.2468 0.15 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra010310.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 10 YEAR 3 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.85 83.18
100 YEAR Area rainfall data:

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

97.86 2.00 195.72
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 1.323(In)
Areal adjustment factor = 99.96 %
Adjusted average point rain = 1.323(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 70.5 0.356 0.442 0.214 1.000 0.214 Sum (F) = 0.214
Area averaged mean soil loss (F) (In/Hr) = 0.214
Minimum soil loss rate ((In/Hr)) = 0.107
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.206 ( 0.214) 0.113 0.094 2 0.17 1.30 0.206 ( 0.214) 0.113 0.094 3 0.25 1.10 0.175 ( 0.214) 0.095 0.079 4 0.33 1.50 0.238 ( 0.214) 0.130 0.108 5 0.42 1.50 0.238 ( 0.214) 0.130 0.108 6 0.50 1.80 0.286 ( 0.214) 0.156 0.130 7 0.58 1.50 0.238 ( 0.214) 0.130 0.108 8 0.67 1.80 0.286 ( 0.214) 0.156 0.130 9 0.75 1.80 0.286 ( 0.214) 0.156 0.130 10 0.83 1.50 0.238 ( 0.214) 0.130 0.108 11 0.92 1.60 0.254 ( 0.214) 0.139 0.115 12 1.00 1.80 0.286 ( 0.214) 0.156 0.130 13 1.08 2.20 0.349 ( 0.214) 0.191 0.158 14 1.17 2.20 0.349 ( 0.214) 0.191 0.158 15 1.25 2.20 0.349 ( 0.214) 0.191 0.158 16 1.33 2.00 0.317 ( 0.214) 0.173 0.144 17 1.42 2.60 0.413 0.214 ( 0.225) 0.198 18 1.50 2.70 0.429 0.214 ( 0.234) 0.214 19 1.58 2.40 0.381 ( 0.214) 0.208 0.173 20 1.67 2.70 0.429 0.214 ( 0.234) 0.214 21 1.75 3.30 0.524 0.214 ( 0.286) 0.309 22 1.83 3.10 0.492 0.214 ( 0.269) 0.278 23 1.92 2.90 0.460 0.214 ( 0.251) 0.246 24 2.00 3.00 0.476 0.214 ( 0.260) 0.262 25 2.08 3.10 0.492 0.214 ( 0.269) 0.278 26 2.17 4.20 0.667 0.214 ( 0.364) 0.452 27 2.25 5.00 0.794 0.214 ( 0.434) 0.579 28 2.33 3.50 0.555 0.214 ( 0.303) 0.341 29 2.42 6.80 1.079 0.214 ( 0.590) 0.865 30 2.50 7.30 1.159 0.214 ( 0.633) 0.944 31 2.58 8.20 1.301 0.214 ( 0.711) 1.087 32 2.67 5.90 0.936 0.214 ( 0.512) 0.722 33 2.75 2.00 0.317 ( 0.214) 0.173 0.144 34 2.83 1.80 0.286 ( 0.214) 0.156 0.130 35 2.92 1.80 0.286 ( 0.214) 0.156 0.130 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
36 3.00 0.60 0.095 ( 0.214) 0.052 0.043 (Loss Rate Not Used)
Sum = 100.0 Sum = 9.6 Flood volume = Effective rainfall 0.80(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 6.5(Ac.Ft) Total soil loss = 0.53(In)
Total soil loss = 4.289(Ac.Ft)
Total rainfall = 1.32(In)
Flood volume = 282975.1 Cubic Feet
Total soil loss = 186837.7 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 89.058(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 22.5 45.0 67.5 90.0 ----------------------------------------------------------------------- 0+ 5 0.0097 1.41 Q | | | | 0+10 0.0489 5.69 V Q | | | | 0+15 0.0981 7.15 V Q | | | | 0+20 0.1508 7.65 V Q | | | | 0+25 0.2137 9.13 |V Q | | | | 0+30 0.2835 10.13 |V Q | | | | 0+35 0.3602 11.14 | V Q | | | | 0+40 0.4365 11.08 | V Q | | | | 0+45 0.5190 11.98 | V Q | | | | 0+50 0.6021 12.07 | V Q | | | | 0+55 0.6803 11.35 | VQ | | | | 1+ 0 0.7602 11.60 | VQ | | | | 1+ 5 0.8478 12.72 | Q | | | | 1+10 0.9462 14.29 | VQ | | | | 1+15 1.0489 14.91 | Q | | | | 1+20 1.1519 14.96 | QV | | | | 1+25 1.2573 15.29 | QV | | | | 1+30 1.3802 17.86 | QV | | | | 1+35 1.5103 18.89 | QV| | | | 1+40 1.6365 18.31 | Q V | | | 1+45 1.7829 21.26 | QV | | | 1+50 1.9604 25.78 | |QV | | | 1+55 2.1382 25.82 | |Q V | | | 2+ 0 2.3099 24.93 | |Q V | | | 2+ 5 2.4863 25.61 | |Q V | | | 2+10 2.6874 29.20 | | Q V | | | 2+15 2.9594 39.50 | | QV | | | 2+20 3.2696 45.03 | | Q | | 2+25 3.5847 45.75 | | Q V | | 2+30 4.0564 68.50 | | | V Q | 2+35 4.6273 82.90 | | | V | Q | 2+40 5.2406 89.06 | | | | V Q| 2+45 5.7161 69.04 | | | Q V | 2+50 5.9823 38.64 | | Q | | V | 2+55 6.1658 26.66 | |Q | | V | 3+ 0 6.3043 20.10 | Q | | | V | 3+ 5 6.3898 12.43 | Q | | | V| 3+10 6.4383 7.04 | Q | | | V| 3+15 6.4665 4.09 |Q | | | V| 3+20 6.4825 2.33 |Q | | | V| 3+25 6.4903 1.13 Q | | | V| 3+30 6.4935 0.46 Q | | | V| 3+35 6.4952 0.25 Q | | | V| 3+40 6.4960 0.12 Q | | | V| 3+45 6.4962 0.03 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra010610.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 10 YEAR 6 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 1.20 117.43
100 YEAR Area rainfall data:

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

97.86 3.00 293.58
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.200(In)
Area Averaged 100-Year Rainfall = 3.000(In)
Point rain (area averaged) = 1.941(In)
Areal adjustment factor = 99.97 %
Adjusted average point rain = 1.940(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 70.5 0.356 0.442 0.214 1.000 0.214 Sum (F) = 0.214
Area averaged mean soil loss (F) (In/Hr) = 0.214
Minimum soil loss rate ((In/Hr)) = 0.107
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.116 ( 0.214) 0.064 0.053 2 0.17 0.60 0.140 ( 0.214) 0.076 0.063 3 0.25 0.60 0.140 ( 0.214) 0.076 0.063 4 0.33 0.60 0.140 ( 0.214) 0.076 0.063 5 0.42 0.60 0.140 ( 0.214) 0.076 0.063 6 0.50 0.70 0.163 ( 0.214) 0.089 0.074 7 0.58 0.70 0.163 ( 0.214) 0.089 0.074 8 0.67 0.70 0.163 ( 0.214) 0.089 0.074 9 0.75 0.70 0.163 ( 0.214) 0.089 0.074 10 0.83 0.70 0.163 ( 0.214) 0.089 0.074 11 0.92 0.70 0.163 ( 0.214) 0.089 0.074 12 1.00 0.80 0.186 ( 0.214) 0.102 0.084 13 1.08 0.80 0.186 ( 0.214) 0.102 0.084 14 1.17 0.80 0.186 ( 0.214) 0.102 0.084 15 1.25 0.80 0.186 ( 0.214) 0.102 0.084 16 1.33 0.80 0.186 ( 0.214) 0.102 0.084 17 1.42 0.80 0.186 ( 0.214) 0.102 0.084 18 1.50 0.80 0.186 ( 0.214) 0.102 0.084 19 1.58 0.80 0.186 ( 0.214) 0.102 0.084 20 1.67 0.80 0.186 ( 0.214) 0.102 0.084 21 1.75 0.80 0.186 ( 0.214) 0.102 0.084 22 1.83 0.80 0.186 ( 0.214) 0.102 0.084 23 1.92 0.80 0.186 ( 0.214) 0.102 0.084 24 2.00 0.90 0.210 ( 0.214) 0.114 0.095 25 2.08 0.80 0.186 ( 0.214) 0.102 0.084 26 2.17 0.90 0.210 ( 0.214) 0.114 0.095 27 2.25 0.90 0.210 ( 0.214) 0.114 0.095 28 2.33 0.90 0.210 ( 0.214) 0.114 0.095 29 2.42 0.90 0.210 ( 0.214) 0.114 0.095 30 2.50 0.90 0.210 ( 0.214) 0.114 0.095 31 2.58 0.90 0.210 ( 0.214) 0.114 0.095 32 2.67 0.90 0.210 ( 0.214) 0.114 0.095 33 2.75 1.00 0.233 ( 0.214) 0.127 0.106 34 2.83 1.00 0.233 ( 0.214) 0.127 0.106 35 2.92 1.00 0.233 ( 0.214) 0.127 0.106 36 3.00 1.00 0.233 ( 0.214) 0.127 0.106 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
37 3.08 1.00 0.233 ( 0.214) 0.127 0.106 38 3.17 1.10 0.256 ( 0.214) 0.140 0.116 39 3.25 1.10 0.256 ( 0.214) 0.140 0.116 40 3.33 1.10 0.256 ( 0.214) 0.140 0.116 41 3.42 1.20 0.279 ( 0.214) 0.153 0.127 42 3.50 1.30 0.303 ( 0.214) 0.165 0.137 43 3.58 1.40 0.326 ( 0.214) 0.178 0.148 44 3.67 1.40 0.326 ( 0.214) 0.178 0.148 45 3.75 1.50 0.349 ( 0.214) 0.191 0.158 46 3.83 1.50 0.349 ( 0.214) 0.191 0.158 47 3.92 1.60 0.372 ( 0.214) 0.203 0.169 48 4.00 1.60 0.372 ( 0.214) 0.203 0.169 49 4.08 1.70 0.396 0.214 ( 0.216) 0.181 50 4.17 1.80 0.419 0.214 ( 0.229) 0.205 51 4.25 1.90 0.442 0.214 ( 0.242) 0.228 52 4.33 2.00 0.466 0.214 ( 0.254) 0.251 53 4.42 2.10 0.489 0.214 ( 0.267) 0.274 54 4.50 2.10 0.489 0.214 ( 0.267) 0.274 55 4.58 2.20 0.512 0.214 ( 0.280) 0.298 56 4.67 2.30 0.535 0.214 ( 0.293) 0.321 57 4.75 2.40 0.559 0.214 ( 0.305) 0.344 58 4.83 2.40 0.559 0.214 ( 0.305) 0.344 59 4.92 2.50 0.582 0.214 ( 0.318) 0.368 60 5.00 2.60 0.605 0.214 ( 0.331) 0.391 61 5.08 3.10 0.722 0.214 ( 0.394) 0.507 62 5.17 3.60 0.838 0.214 ( 0.458) 0.624 63 5.25 3.90 0.908 0.214 ( 0.496) 0.693 64 5.33 4.20 0.978 0.214 ( 0.534) 0.763 65 5.42 4.70 1.094 0.214 ( 0.598) 0.880 66 5.50 5.60 1.304 0.214 ( 0.712) 1.089 67 5.58 1.90 0.442 0.214 ( 0.242) 0.228 68 5.67 0.90 0.210 ( 0.214) 0.114 0.095 69 5.75 0.60 0.140 ( 0.214) 0.076 0.063 70 5.83 0.50 0.116 ( 0.214) 0.064 0.053 71 5.92 0.30 0.070 ( 0.214) 0.038 0.032 72 6.00 0.20 0.047 ( 0.214) 0.025 0.021 (Loss Rate Not Used)
Sum = 100.0 Sum = 13.2 Flood volume = Effective rainfall 1.10(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 9.0(Ac.Ft) Total soil loss = 0.84(In)
Total soil loss = 6.831(Ac.Ft)
Total rainfall = 1.94(In)
Flood volume = 391569.5 Cubic Feet
Total soil loss = 297538.2 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 81.938(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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 22.5 45.0 67.5 90.0 ----------------------------------------------------------------------- 0+ 5 0.0055 0.79 Q | | | | 0+10 0.0287 3.37 VQ | | | | 0+15 0.0617 4.80 V Q | | | | 0+20 0.0989 5.40 V Q | | | | 0+25 0.1383 5.72 V Q | | | | 0+30 0.1801 6.07 V Q | | | | 0+35 0.2262 6.69 |VQ | | | | 0+40 0.2742 6.97 |V Q | | | | 0+45 0.3232 7.12 |V Q | | | | 0+50 0.3729 7.21 |V Q | | | | 0+55 0.4228 7.24 |V Q | | | | 1+ 0 0.4739 7.42 | VQ | | | | 1+ 5 0.5285 7.92 | VQ | | | | 1+10 0.5844 8.12 | VQ | | | | 1+15 0.6409 8.21 | VQ | | | | 1+20 0.6978 8.26 | Q | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
1+25 0.7548 8.29 | Q | | | | 1+30 0.8120 8.31 | Q | | | | 1+35 0.8693 8.32 | Q | | | | 1+40 0.9267 8.33 | QV | | | | 1+45 0.9841 8.34 | QV | | | | 1+50 1.0415 8.34 | QV | | | | 1+55 1.0990 8.34 | QV | | | | 2+ 0 1.1575 8.50 | Q V | | | | 2+ 5 1.2182 8.82 | Q V | | | | 2+10 1.2780 8.68 | Q V | | | | 2+15 1.3404 9.06 | QV | | | | 2+20 1.4039 9.22 | Q V | | | | 2+25 1.4678 9.28 | Q V | | | | 2+30 1.5320 9.32 | Q V | | | | 2+35 1.5963 9.34 | Q V | | | | 2+40 1.6608 9.36 | Q V | | | | 2+45 1.7264 9.53 | Q V | | | | 2+50 1.7954 10.01 | Q V | | | | 2+55 1.8657 10.21 | Q V | | | | 3+ 0 1.9366 10.29 | Q V | | | | 3+ 5 2.0078 10.34 | Q V | | | | 3+10 2.0803 10.53 | Q V| | | | 3+15 2.1563 11.03 | Q V| | | | 3+20 2.2337 11.24 | Q V| | | | 3+25 2.3128 11.49 | Q V | | | 3+30 2.3967 12.18 | Q V | | | 3+35 2.4865 13.04 | Q |V | | | 3+40 2.5817 13.82 | Q |V | | | 3+45 2.6803 14.31 | Q |V | | | 3+50 2.7833 14.96 | Q | V | | | 3+55 2.8895 15.42 | Q | V | | | 4+ 0 3.0000 16.05 | Q | V | | | 4+ 5 3.1138 16.52 | Q | V | | | 4+10 3.2348 17.57 | Q | V | | | 4+15 3.3677 19.29 | Q | V | | | 4+20 3.5142 21.27 | Q| V | | | 4+25 3.6751 23.37 | Q V | | | 4+30 3.8486 25.19 | |Q V | | | 4+35 4.0301 26.35 | |Q V | | | 4+40 4.2242 28.18 | | Q V | | | 4+45 4.4327 30.28 | | Q V| | | 4+50 4.6539 32.11 | | Q V | | 4+55 4.8831 33.28 | | Q |V | | 5+ 0 5.1249 35.11 | | Q | V | | 5+ 5 5.3907 38.60 | | Q | V | | 5+10 5.7105 46.43 | | Q V | | 5+15 6.0912 55.28 | | | Q V | | 5+20 6.5233 62.74 | | | Q V| | 5+25 7.0089 70.52 | | | |Q | 5+30 7.5719 81.74 | | | | V Q | 5+35 8.1362 81.94 | | | | Q | 5+40 8.4537 46.10 | | Q | V | 5+45 8.6388 26.88 | |Q | | V | 5+50 8.7623 17.94 | Q | | | V | 5+55 8.8497 12.69 | Q | | | V| 6+ 0 8.9099 8.74 | Q | | | V| 6+ 5 8.9489 5.65 | Q | | | V| 6+10 8.9699 3.05 |Q | | | V| 6+15 8.9808 1.58 Q | | | V| 6+20 8.9849 0.60 Q | | | V| 6+25 8.9871 0.31 Q | | | V| 6+30 8.9882 0.17 Q | | | V| 6+35 8.9888 0.09 Q | | | V| 6+40 8.9891 0.04 Q | | | V| 6+45 8.9892 0.01 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 11/08/21 File: PRA0102410.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 10 YEAR HOUR STORM

HUNSAKER & ASSOCIATES, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 Min.

Unit time = 15.00 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]

97.86 2.00 195.72
100 YEAR Area rainfall data:

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

97.86 5.00 489.30
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 2.000(In)
Area Averaged 100-Year Rainfall = 5.000(In)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Point rain (area averaged) = 3.234(In)
Areal adjustment factor = 99.98 %
Adjusted average point rain = 3.234(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 70.5 0.356 0.442 0.214 1.000 0.214 Sum (F) = 0.214
Area averaged mean soil loss (F) (In/Hr) = 0.214
Minimum soil loss rate ((In/Hr)) = 0.107
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.250 260.360 52.212 51.493 2 0.500 520.720 39.421 38.879 3 0.750 781.080 6.693 6.601 4 1.000 1041.441 1.674 1.651 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.25 0.20 0.026 ( 0.379) 0.014 0.012 2 0.50 0.30 0.039 ( 0.374) 0.021 0.018 3 0.75 0.30 0.039 ( 0.370) 0.021 0.018 4 1.00 0.40 0.052 ( 0.366) 0.028 0.023 5 1.25 0.30 0.039 ( 0.361) 0.021 0.018 6 1.50 0.30 0.039 ( 0.357) 0.021 0.018 7 1.75 0.30 0.039 ( 0.353) 0.021 0.018 8 2.00 0.40 0.052 ( 0.348) 0.028 0.023 9 2.25 0.40 0.052 ( 0.344) 0.028 0.023 10 2.50 0.40 0.052 ( 0.340) 0.028 0.023 11 2.75 0.50 0.065 ( 0.336) 0.035 0.029 12 3.00 0.50 0.065 ( 0.332) 0.035 0.029 13 3.25 0.50 0.065 ( 0.328) 0.035 0.029 14 3.50 0.50 0.065 ( 0.324) 0.035 0.029 15 3.75 0.50 0.065 ( 0.319) 0.035 0.029 16 4.00 0.60 0.078 ( 0.315) 0.042 0.035 17 4.25 0.60 0.078 ( 0.311) 0.042 0.035 18 4.50 0.70 0.091 ( 0.308) 0.049 0.041 19 4.75 0.70 0.091 ( 0.304) 0.049 0.041 20 5.00 0.80 0.103 ( 0.300) 0.057 0.047 21 5.25 0.60 0.078 ( 0.296) 0.042 0.035 22 5.50 0.70 0.091 ( 0.292) 0.049 0.041 23 5.75 0.80 0.103 ( 0.288) 0.057 0.047 24 6.00 0.80 0.103 ( 0.284) 0.057 0.047 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
25 6.25 0.90 0.116 ( 0.281) 0.064 0.053 26 6.50 0.90 0.116 ( 0.277) 0.064 0.053 27 6.75 1.00 0.129 ( 0.273) 0.071 0.059 28 7.00 1.00 0.129 ( 0.269) 0.071 0.059 29 7.25 1.00 0.129 ( 0.266) 0.071 0.059 30 7.50 1.10 0.142 ( 0.262) 0.078 0.065 31 7.75 1.20 0.155 ( 0.258) 0.085 0.070 32 8.00 1.30 0.168 ( 0.255) 0.092 0.076 33 8.25 1.50 0.194 ( 0.251) 0.106 0.088 34 8.50 1.50 0.194 ( 0.248) 0.106 0.088 35 8.75 1.60 0.207 ( 0.244) 0.113 0.094 36 9.00 1.70 0.220 ( 0.241) 0.120 0.100 37 9.25 1.90 0.246 ( 0.238) 0.134 0.111 38 9.50 2.00 0.259 ( 0.234) 0.141 0.117 39 9.75 2.10 0.272 ( 0.231) 0.148 0.123 40 10.00 2.20 0.285 ( 0.228) 0.155 0.129 41 10.25 1.50 0.194 ( 0.224) 0.106 0.088 42 10.50 1.50 0.194 ( 0.221) 0.106 0.088 43 10.75 2.00 0.259 ( 0.218) 0.141 0.117 44 11.00 2.00 0.259 ( 0.215) 0.141 0.117 45 11.25 1.90 0.246 ( 0.211) 0.134 0.111 46 11.50 1.90 0.246 ( 0.208) 0.134 0.111 47 11.75 1.70 0.220 ( 0.205) 0.120 0.100 48 12.00 1.80 0.233 ( 0.202) 0.127 0.106 49 12.25 2.50 0.323 ( 0.199) 0.177 0.147 50 12.50 2.60 0.336 ( 0.196) 0.184 0.153 51 12.75 2.80 0.362 0.193 ( 0.198) 0.169 52 13.00 2.90 0.375 0.190 ( 0.205) 0.185 53 13.25 3.40 0.440 0.187 ( 0.240) 0.252 54 13.50 3.40 0.440 0.185 ( 0.240) 0.255 55 13.75 2.30 0.297 ( 0.182) 0.163 0.135 56 14.00 2.30 0.297 ( 0.179) 0.163 0.135 57 14.25 2.70 0.349 0.176 ( 0.191) 0.173 58 14.50 2.60 0.336 0.174 ( 0.184) 0.163 59 14.75 2.60 0.336 0.171 ( 0.184) 0.165 60 15.00 2.50 0.323 0.168 ( 0.177) 0.155 61 15.25 2.40 0.310 0.166 ( 0.170) 0.145 62 15.50 2.30 0.297 ( 0.163) 0.163 0.135 63 15.75 1.90 0.246 ( 0.161) 0.134 0.111 64 16.00 1.90 0.246 ( 0.158) 0.134 0.111 65 16.25 0.40 0.052 ( 0.156) 0.028 0.023 66 16.50 0.40 0.052 ( 0.153) 0.028 0.023 67 16.75 0.30 0.039 ( 0.151) 0.021 0.018 68 17.00 0.30 0.039 ( 0.149) 0.021 0.018 69 17.25 0.50 0.065 ( 0.147) 0.035 0.029 70 17.50 0.50 0.065 ( 0.144) 0.035 0.029 71 17.75 0.50 0.065 ( 0.142) 0.035 0.029 72 18.00 0.40 0.052 ( 0.140) 0.028 0.023 73 18.25 0.40 0.052 ( 0.138) 0.028 0.023 74 18.50 0.40 0.052 ( 0.136) 0.028 0.023 75 18.75 0.30 0.039 ( 0.134) 0.021 0.018 76 19.00 0.20 0.026 ( 0.132) 0.014 0.012 77 19.25 0.30 0.039 ( 0.130) 0.021 0.018 78 19.50 0.40 0.052 ( 0.129) 0.028 0.023 79 19.75 0.30 0.039 ( 0.127) 0.021 0.018 80 20.00 0.20 0.026 ( 0.125) 0.014 0.012 81 20.25 0.30 0.039 ( 0.123) 0.021 0.018 82 20.50 0.30 0.039 ( 0.122) 0.021 0.018 83 20.75 0.30 0.039 ( 0.120) 0.021 0.018 84 21.00 0.20 0.026 ( 0.119) 0.014 0.012 85 21.25 0.30 0.039 ( 0.117) 0.021 0.018 86 21.50 0.20 0.026 ( 0.116) 0.014 0.012 87 21.75 0.30 0.039 ( 0.115) 0.021 0.018 88 22.00 0.20 0.026 ( 0.114) 0.014 0.012 89 22.25 0.30 0.039 ( 0.112) 0.021 0.018 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
90 22.50 0.20 0.026 ( 0.111) 0.014 0.012 91 22.75 0.20 0.026 ( 0.110) 0.014 0.012 92 23.00 0.20 0.026 ( 0.110) 0.014 0.012 93 23.25 0.20 0.026 ( 0.109) 0.014 0.012 94 23.50 0.20 0.026 ( 0.108) 0.014 0.012 95 23.75 0.20 0.026 ( 0.108) 0.014 0.012 96 24.00 0.20 0.026 ( 0.107) 0.014 0.012 (Loss Rate Not Used)
Sum = 100.0 Sum = 6.0 Flood volume = Effective rainfall 1.51(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 12.3(Ac.Ft) Total soil loss = 1.72(In)
Total soil loss = 14.045(Ac.Ft)
Total rainfall = 3.23(In)
Flood volume = 536883.3 Cubic Feet
Total soil loss = 611796.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 24.463(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 15 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 7.5 15.0 22.5 30.0 ----------------------------------------------------------------------- 0+15 0.0125 0.60 Q | | | | 0+30 0.0407 1.36 VQ | | | | 0+45 0.0752 1.67 V Q | | | | 1+ 0 0.1171 2.03 V Q | | | | 1+15 0.1577 1.97 V Q | | | | 1+30 0.1944 1.78 V Q | | | | 1+45 0.2305 1.75 V Q | | | | 2+ 0 0.2726 2.04 V Q | | | | 2+15 0.3195 2.27 V Q | | | | 2+30 0.3671 2.31 |V Q | | | | 2+45 0.4212 2.62 |V Q | | | | 3+ 0 0.4800 2.85 |V Q | | | | 3+15 0.5397 2.89 |V Q | | | | 3+30 0.5995 2.90 |V Q | | | | 3+45 0.6593 2.90 | VQ | | | | 4+ 0 0.7254 3.20 | V Q | | | | 4+15 0.7961 3.43 | V Q | | | | 4+30 0.8740 3.77 | V Q | | | | 4+45 0.9567 4.00 | V Q | | | | 5+ 0 1.0465 4.35 | V Q | | | | 5+15 1.1287 3.98 | V Q | | | | 5+30 1.2085 3.86 | V Q | | | | 5+45 1.2979 4.33 | VQ | | | | 6+ 0 1.3924 4.57 | V Q | | | | 6+15 1.4942 4.92 | V Q | | | | 6+30 1.6009 5.16 | VQ | | | | 6+45 1.7146 5.50 | V Q | | | | 7+ 0 1.8332 5.74 | V Q | | | | 7+15 1.9527 5.78 | VQ | | | | 7+30 2.0785 6.09 | V Q | | | | 7+45 2.2154 6.62 | VQ | | | | 8+ 0 2.3640 7.19 | V Q| | | | 8+15 2.5308 8.07 | V Q | | | 8+30 2.7081 8.58 | V |Q | | | 8+45 2.8934 8.97 | V|Q | | | 9+ 0 3.0900 9.52 | V Q | | | 9+15 3.3047 10.39 | V Q | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
9+30 3.5360 11.20 | V Q | | | 9+45 3.7802 11.82 | | V Q | | | 10+ 0 4.0364 12.40 | | V Q | | | 10+15 4.2547 10.56 | | VQ | | | 10+30 4.4410 9.02 | | Q V | | | 10+45 4.6531 10.27 | | Q V | | | 11+ 0 4.8873 11.34 | | Q | | | 11+15 5.1194 11.23 | | Q V | | | 11+30 5.3477 11.05 | | Q V | | | 11+45 5.5627 10.41 | | Q V | | | 12+ 0 5.7743 10.24 | | Q V | | | 12+15 6.0328 12.51 | | Q V| | | 12+30 6.3309 14.43 | | QV | | 12+45 6.6570 15.78 | | Q | | 13+ 0 7.0153 17.34 | | | VQ | | 13+15 7.4607 21.56 | | | V Q | | 13+30 7.9661 24.46 | | | V | Q | 13+45 8.3556 18.85 | | | Q V | | 14+ 0 8.6512 14.31 | | Q| V | | 14+15 8.9709 15.47 | | Q V| | 14+30 9.3061 16.22 | | |Q V | 14+45 9.6411 16.21 | | |Q V | 15+ 0 9.9671 15.78 | | |Q | V | 15+15 10.2738 14.85 | | Q| | V | 15+30 10.5606 13.88 | | Q | | V | 15+45 10.8127 12.21 | | Q | | V | 16+ 0 11.0444 11.21 | | Q | | V | 16+15 11.1788 6.51 | Q | | | V | 16+30 11.2417 3.04 | Q | | | V | 16+45 11.2863 2.16 | Q | | | V | 17+ 0 11.3232 1.79 | Q | | | V | 17+15 11.3718 2.35 | Q | | | V | 17+30 11.4296 2.80 | Q | | | V | 17+45 11.4890 2.88 | Q | | | V | 18+ 0 11.5426 2.59 | Q | | | V | 18+15 11.5914 2.36 | Q | | | V | 18+30 11.6395 2.33 | Q | | | V | 18+45 11.6811 2.01 | Q | | | V | 19+ 0 11.7117 1.48 |Q | | | V | 19+15 11.7431 1.52 | Q | | | V | 19+30 11.7844 2.00 | Q | | | V | 19+45 11.8248 1.96 | Q | | | V | 20+ 0 11.8553 1.47 |Q | | | V | 20+15 11.8867 1.52 | Q | | | V | 20+30 11.9218 1.70 | Q | | | V | 20+45 11.9574 1.73 | Q | | | V | 21+ 0 11.9871 1.43 |Q | | | V | 21+15 12.0183 1.51 | Q | | | V| 21+30 12.0471 1.40 |Q | | | V| 21+45 12.0781 1.50 |Q | | | V| 22+ 0 12.1069 1.40 |Q | | | V| 22+15 12.1379 1.50 |Q | | | V| 22+30 12.1667 1.40 |Q | | | V| 22+45 12.1915 1.20 |Q | | | V| 23+ 0 12.2156 1.17 |Q | | | V| 23+15 12.2395 1.16 |Q | | | V| 23+30 12.2635 1.16 |Q | | | V| 23+45 12.2874 1.16 |Q | | | V| 24+ 0 12.3113 1.16 |Q | | | V| 24+15 12.3227 0.55 Q | | | V| 24+30 12.3247 0.10 Q | | | V| 24+45 12.3251 0.02 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 100 Year - Post-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra1001100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 100 YEAR 1 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.55 53.82
100 YEAR Area rainfall data:

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

97.86 1.30 127.22
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 1.300(In)
Areal adjustment factor = 99.91 %
Adjusted average point rain = 1.299(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 85.3 0.184 0.442 0.111 1.000 0.111 Sum (F) = 0.111
Area averaged mean soil loss (F) (In/Hr) = 0.111
Minimum soil loss rate ((In/Hr)) = 0.055
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5200 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 4.10 0.639 0.111 ( 0.349) 0.528 2 0.17 4.60 0.717 0.111 ( 0.392) 0.606 3 0.25 4.50 0.701 0.111 ( 0.383) 0.591 4 0.33 4.90 0.764 0.111 ( 0.417) 0.653 5 0.42 5.50 0.857 0.111 ( 0.468) 0.747 6 0.50 6.40 0.998 0.111 ( 0.545) 0.887 7 0.58 7.10 1.107 0.111 ( 0.605) 0.996 8 0.67 9.00 1.403 0.111 ( 0.766) 1.292 9 0.75 12.90 2.011 0.111 ( 1.098) 1.900 10 0.83 29.50 4.598 0.111 ( 2.512) 4.487 11 0.92 7.00 1.091 0.111 ( 0.596) 0.980 12 1.00 4.50 0.701 0.111 ( 0.383) 0.591 (Loss Rate Not Used)
Sum = 100.0 Sum = 14.3 Flood volume = Effective rainfall 1.19(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 9.7(Ac.Ft) Total soil loss = 0.11(In)
Total soil loss = 0.901(Ac.Ft)
Total rainfall = 1.30(In)
Flood volume = 422126.1 Cubic Feet
Total soil loss = 39265.7 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 274.485(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 75.0 150.0 225.0 300.0 ----------------------------------------------------------------------- 0+ 5 0.0547 7.94 VQ | | | | Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
0+10 0.2841 33.31 |V Q | | | | 0+15 0.6017 46.11 | V Q | | | | 0+20 0.9584 51.81 | V Q | | | | 0+25 1.3633 58.79 | V Q | | | | 0+30 1.8319 68.04 | V Q| | | | 0+35 2.3792 79.47 | VQ | | | 0+40 3.0214 93.24 | | Q | | | 0+45 3.8487 120.12 | | VQ | | | 0+50 5.1875 194.39 | | |V Q | | 0+55 7.0779 274.49 | | | V| Q | 1+ 0 8.1881 161.21 | | |Q | V | 1+ 5 8.8480 95.82 | | Q | | V | 1+10 9.1864 49.13 | Q | | | V | 1+15 9.3847 28.79 | Q | | | V | 1+20 9.5140 18.77 | Q | | | V| 1+25 9.5971 12.07 |Q | | | V| 1+30 9.6500 7.67 |Q | | | V| 1+35 9.6804 4.42 Q | | | V| 1+40 9.6882 1.13 Q | | | V| 1+45 9.6907 0.36 Q | | | V| ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
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 - 2014, Version 9.0 Study date 05/18/21 File: pra1003100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6407
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
PROPOSED CONDITION UNIT HYDROGRAPH - 100 YEAR 3 HOUR STORM HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 97.86(Ac.) = 0.153 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 97.86(Ac.) = 0.153 Sq. Mi.

Length along longest watercourse = 5833.00(Ft.)
Length along longest watercourse measured to centroid = 2440.00(Ft.) Length along longest watercourse = 1.105 Mi.

Length along longest watercourse measured to centroid = 0.462 Mi.

Difference in elevation = 302.00(Ft.)
Slope along watercourse = 273.3688 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.096 Hr.

Lag time = 5.76 Min.
25% of lag time = 1.44 Min.
40% of lag time = 2.30 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]

97.86 0.85 83.18
100 YEAR Area rainfall data:

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

97.86 2.00 195.72
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 2.000(In)
Areal adjustment factor = 99.96 %
Adjusted average point rain = 1.999(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

97.860 70.50 0.442
Total Area Entered = 97.86(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

70.5 85.3 0.184 0.442 0.111 1.000 0.111 Sum (F) = 0.111
Area averaged mean soil loss (F) (In/Hr) = 0.111
Minimum soil loss rate ((In/Hr)) = 0.055
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.546
--------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 86.787 15.235 15.025 2 0.167 173.573 46.393 45.755 3 0.250 260.360 18.144 17.894 4 0.333 347.147 7.825 7.718 5 0.417 433.934 4.607 4.543 6 0.500 520.720 2.894 2.854 7 0.583 607.507 2.036 2.008 8 0.667 694.294 1.334 1.316 9 0.750 781.080 0.909 0.897 10 0.833 867.867 0.623 0.615 Sum = 100.000 Sum= 98.625
----------------------------------------------------------------------- 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 0.312 0.111 ( 0.170) 0.201 2 0.17 1.30 0.312 0.111 ( 0.170) 0.201 3 0.25 1.10 0.264 0.111 ( 0.144) 0.153 4 0.33 1.50 0.360 0.111 ( 0.197) 0.249 5 0.42 1.50 0.360 0.111 ( 0.197) 0.249 6 0.50 1.80 0.432 0.111 ( 0.236) 0.321 7 0.58 1.50 0.360 0.111 ( 0.197) 0.249 8 0.67 1.80 0.432 0.111 ( 0.236) 0.321 9 0.75 1.80 0.432 0.111 ( 0.236) 0.321 10 0.83 1.50 0.360 0.111 ( 0.197) 0.249 11 0.92 1.60 0.384 0.111 ( 0.210) 0.273 12 1.00 1.80 0.432 0.111 ( 0.236) 0.321 13 1.08 2.20 0.528 0.111 ( 0.288) 0.417 14 1.17 2.20 0.528 0.111 ( 0.288) 0.417 15 1.25 2.20 0.528 0.111 ( 0.288) 0.417 16 1.33 2.00 0.480 0.111 ( 0.262) 0.369 17 1.42 2.60 0.624 0.111 ( 0.341) 0.513 18 1.50 2.70 0.648 0.111 ( 0.354) 0.537 19 1.58 2.40 0.576 0.111 ( 0.315) 0.465 20 1.67 2.70 0.648 0.111 ( 0.354) 0.537 21 1.75 3.30 0.792 0.111 ( 0.433) 0.681 22 1.83 3.10 0.744 0.111 ( 0.406) 0.633 23 1.92 2.90 0.696 0.111 ( 0.380) 0.585 24 2.00 3.00 0.720 0.111 ( 0.393) 0.609 25 2.08 3.10 0.744 0.111 ( 0.406) 0.633 26 2.17 4.20 1.008 0.111 ( 0.550) 0.897 27 2.25 5.00 1.199 0.111 ( 0.655) 1.089 28 2.33 3.50 0.840 0.111 ( 0.459) 0.729 29 2.42 6.80 1.631 0.111 ( 0.891) 1.521 30 2.50 7.30 1.751 0.111 ( 0.957) 1.641 31 2.58 8.20 1.967 0.111 ( 1.075) 1.857 32 2.67 5.90 1.415 0.111 ( 0.773) 1.305 33 2.75 2.00 0.480 0.111 ( 0.262) 0.369 34 2.83 1.80 0.432 0.111 ( 0.236) 0.321 35 2.92 1.80 0.432 0.111 ( 0.236) 0.321 36 3.00 0.60 0.144 ( 0.111) 0.079 0.065 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
(Loss Rate Not Used)
Sum = 100.0 Sum = 20.0 Flood volume = Effective rainfall 1.67(In)
times area 97.9(Ac.)/[(In)/(Ft.)] = 13.6(Ac.Ft) Total soil loss = 0.33(In)
Total soil loss = 2.683(Ac.Ft)
Total rainfall = 2.00(In)
Flood volume = 593306.7 Cubic Feet
Total soil loss = 116852.7 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 155.692(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 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+ 5 0.0208 3.03 Q | | | | 0+10 0.1052 12.24 V Q | | | | 0+15 0.2093 15.13 V Q | | | | 0+20 0.3190 15.93 V Q | | | | 0+25 0.4594 20.38 |V Q | | | | 0+30 0.6204 23.38 |V Q | | | | 0+35 0.8030 26.52 | V Q | | | | 0+40 0.9832 26.16 | V Q | | | | 0+45 1.1835 29.08 | V Q | | | | 0+50 1.3854 29.31 | VQ | | | | 0+55 1.5706 26.90 | VQ | | | | 1+ 0 1.7617 27.75 | Q | | | | 1+ 5 1.9785 31.48 | VQ | | | | 1+10 2.2313 36.70 | VQ | | | | 1+15 2.4982 38.77 | Q | | | | 1+20 2.7665 38.95 | QV | | | | 1+25 3.0385 39.49 | QV | | | | 1+30 3.3547 45.92 | Q| | | | 1+35 3.6878 48.37 | QV | | | 1+40 4.0161 47.67 | Q|V | | | 1+45 4.3787 52.65 | Q V | | | 1+50 4.7902 59.74 | |Q V | | | 1+55 5.2028 59.92 | |Q V | | | 2+ 0 5.6068 58.65 | |Q V | | | 2+ 5 6.0181 59.73 | |Q V | | | 2+10 6.4672 65.21 | | Q V | | | 2+15 7.0235 80.77 | | Q V | | 2+20 7.6373 89.14 | | Q | V | | 2+25 8.2588 90.23 | | Q | V | | 2+30 9.1170 124.61 | | | Q V | | 2+35 10.1251 146.38 | | | Q| | 2+40 11.1973 155.69 | | | |QV | 2+45 12.0548 124.50 | | | Q | V | 2+50 12.5735 75.32 | | Q | | V | 2+55 12.9516 54.89 | Q | | V | 3+ 0 13.2419 42.15 | Q | | | V | 3+ 5 13.4094 24.33 | Q | | | V| 3+10 13.5034 13.64 | Q | | | V| 3+15 13.5586 8.02 |Q | | | V| 3+20 13.5907 4.66 Q | | | V| 3+25 13.6071 2.39 Q | | | V| 3+30 13.6145 1.07 Q | | | V| 3+35 13.6184 0.57 Q | | | V| 3+40 13.6202 0.26 Q | | | V| 3+45 13.6204 0.04 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification