Agenda packet — Coachella City Council, January 28, 2026 (part 7 of 11)

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT BASIC DATA CALCULATION FORM JOB # 0
SHORTCUT METHOD BY ES R. BAZUA, P.E. DATE 1/17/2025
[1] SOURCE
[2] FREQUENCY-YEARS 100
[3] DURATION:
[4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

1.04 2.010 1.00 1.04 1.36 2.010 1.00 1.36 2.23 2.010 1.00 2.23

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 2.01 SUM [7] 1.04 SUM [9] 2.01 SUM [11] 1.36 SUM [13] 2.01 SUM [15] 2.23 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 1.04 1.36 2.23
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 0.40 0.39 0.26
FLOOD VOLUME (cu-ft) 2,906 2,880 1,903
(acre-ft) 0.07 0.07 0.04
REQUIRED STORAGE (cu-ft) 2,439 2,140 370
(acre-ft) 0.06 0.05 0.01
PEAK FLOW (cfs) 1.56 1.34 0.19
MAXIMUM WSEL (ft) 465.72 465.64 465.10

0.189

15.00 0.000
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 2.7
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 1

2.010
1000

0.003
471.5
468.8

0.02 1.0

1.0 2.0

14.3 3.78

0.02 6-HOURS
[6] La-FEET
[7] La-MILES
[8] ELEVATION OF HEADWATER
[9] ELEVATION OF CONCENTRATION POINT
[2] AREA DESIGNATION
[3] AREA - ACRES
[4] L-FEET
[5] L-MILES
5 24-HOURS
[15] LAG TIME-HOURS
[16] LAG TIME-MINUTES

0.05 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

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Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 10 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

RATE IMPERVIOUS RATE
(in/hr) (in/hr) (in/hr)
[Plate C-1] [Plate E-6.1] [Plate E-6.2] [Plate E-6.3]
B 56 0.52 90% 0.10 0.00 0.000 0.0000
B 56 0.52 100% 0.05 1.18 0.587 0.0305
B 56 0.52 20% 0.43 0.00 0.000 0.0000B 56 0.52 40% 0.33 0.00 0.000 0.0000B 56 0.52 50% 0.29 0.00 0.000 0.0000B 56 0.52 65% 0.22 0.00 0.000 0.0000B 56 0.52 80% 0.15 0.00 0.000 0.0000B 56 0.52 75% 0.17 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.83 0.413 0.2147B 56 0.52 0% 0.52 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.00 0.000 0.0000 D 93 0.95 90% 0.18 0.00 0.000 0.0000

0.00 0.000 0.0000

0.00 0.000 0.0000
SUM 2.01 SUM 0.2453
VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY)Fm= 0.122626866C= 0.00227Ft=C(24-(T/60))^1.55 = 0.00227 0.12 in/hr LOW LOSS RATE (80-90 PERCENT) = 90%Where:T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,T=1 1/2 unit time for the second period, etc. (24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

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Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 2.01
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.00
UNIT TIME-PERCENT OF LAG 502.5
TOTAL ADJUSTED STORM RAIN-INCHES 1.04
CONSTANT LOSS RATE-in/hr 0.25
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.05 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.162 0.25 0.15 0.02 0.03 0.00
2 10 0.17 1.3 0.162 0.25 0.15 0.02 0.03 0.00
3 15 0.25 1.1 0.137 0.25 0.12 0.01 0.03 0.00
4 20 0.33 1.5 0.187 0.25 0.17 0.02 0.04 0.00
5 25 0.42 1.5 0.187 0.25 0.17 0.02 0.04 0.00
6 30 0.50 1.8 0.225 0.25 0.20 0.02 0.05 0.00
7 35 0.58 1.5 0.187 0.25 0.17 0.02 0.04 0.00
8 40 0.67 1.8 0.225 0.25 0.20 0.02 0.05 0.00
9 45 0.75 1.8 0.225 0.25 0.20 0.02 0.05 0.00
10 50 0.83 1.5 0.187 0.25 0.17 0.02 0.04 0.00
11 55 0.92 1.6 0.200 0.25 0.18 0.02 0.04 0.00
12 60 1.00 1.8 0.225 0.25 0.20 0.02 0.05 0.00
13 65 1.08 2.2 0.275 0.25 0.25 0.03 0.06 3.60
14 70 1.17 2.2 0.275 0.25 0.25 0.03 0.06 3.60
15 75 1.25 2.2 0.275 0.25 0.25 0.03 0.06 3.60
16 80 1.33 2.0 0.250 0.25 0.22 0.00 0.01 0.00
17 85 1.42 2.6 0.324 0.25 0.29 0.08 0.16 33.70
18 90 1.50 2.7 0.337 0.25 0.30 0.09 0.18 41.22
19 95 1.58 2.4 0.300 0.25 0.27 0.05 0.11 18.65
20 100 1.67 2.7 0.337 0.25 0.30 0.09 0.18 41.22
21 105 1.75 3.3 0.412 0.25 0.37 0.17 0.33 86.38
22 110 1.83 3.1 0.387 0.25 0.35 0.14 0.28 71.33
23 115 1.92 2.9 0.362 0.25 0.33 0.12 0.23 56.28
24 120 2.00 3.0 0.374 0.25 0.34 0.13 0.26 63.80
25 125 2.08 3.1 0.387 0.25 0.35 0.14 0.28 71.33
26 130 2.17 4.2 0.524 0.25 0.47 0.28 0.56 154.11
27 135 2.25 5.0 0.624 0.25 0.56 0.38 0.76 214.31
28 140 2.33 3.5 0.437 0.25 0.39 0.19 0.39 101.43
29 145 2.42 6.8 0.849 0.25 0.76 0.60 1.21 349.77
30 150 2.50 7.3 0.911 0.25 0.82 0.67 1.34 387.39
31 155 2.58 8.2 1.023 0.25 0.92 0.78 1.56 455.12
32 160 2.67 5.9 0.736 0.25 0.66 0.49 0.99 282.04
33 165 2.75 2.0 0.250 0.25 0.22 0.00 0.01 0.00
34 170 2.83 1.8 0.225 0.25 0.20 0.02 0.05 0.00
35 175 2.92 1.8 0.225 0.25 0.20 0.02 0.05 0.00
36 180 3.00 0.6 0.075 0.25 0.07 0.01 0.02 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.40
FLOOD VOLUME (acft) 0.07
FLOOD VOLUME (cuft) 2906.38
REQUIRED STORAGE (acft) 0.06
REQUIRED STORAGE (cuft) 2438.86
PEAK FLOW RATE (cfs) 1.56
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

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Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 2.01
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.00
UNIT TIME-PERCENT OF LAG 502.5
TOTAL ADJUSTED STORM RAIN-INCHES 1.36
CONSTANT LOSS RATE-in/hr 0.245
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.05 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.082 0.25 0.07 0.01 0.02 0.00
2 10 0.17 0.6 0.098 0.25 0.09 0.01 0.02 0.00
3 15 0.25 0.6 0.098 0.25 0.09 0.01 0.02 0.00
4 20 0.33 0.6 0.098 0.25 0.09 0.01 0.02 0.00
5 25 0.42 0.6 0.098 0.25 0.09 0.01 0.02 0.00
6 30 0.50 0.7 0.114 0.25 0.10 0.01 0.02 0.00
7 35 0.58 0.7 0.114 0.25 0.10 0.01 0.02 0.00
8 40 0.67 0.7 0.114 0.25 0.10 0.01 0.02 0.00
9 45 0.75 0.7 0.114 0.25 0.10 0.01 0.02 0.00
10 50 0.83 0.7 0.114 0.25 0.10 0.01 0.02 0.00
11 55 0.92 0.7 0.114 0.25 0.10 0.01 0.02 0.00
12 60 1.00 0.8 0.131 0.25 0.12 0.01 0.03 0.00
13 65 1.08 0.8 0.131 0.25 0.12 0.01 0.03 0.00
14 70 1.17 0.8 0.131 0.25 0.12 0.01 0.03 0.00
15 75 1.25 0.8 0.131 0.25 0.12 0.01 0.03 0.00
16 80 1.33 0.8 0.131 0.25 0.12 0.01 0.03 0.00
17 85 1.42 0.8 0.131 0.25 0.12 0.01 0.03 0.00
18 90 1.50 0.8 0.131 0.25 0.12 0.01 0.03 0.00
19 95 1.58 0.8 0.131 0.25 0.12 0.01 0.03 0.00
20 100 1.67 0.8 0.131 0.25 0.12 0.01 0.03 0.00
21 105 1.75 0.8 0.131 0.25 0.12 0.01 0.03 0.00
22 110 1.83 0.8 0.131 0.25 0.12 0.01 0.03 0.00
23 115 1.92 0.8 0.131 0.25 0.12 0.01 0.03 0.00
24 120 2.00 0.9 0.147 0.25 0.13 0.01 0.03 0.00
25 125 2.08 0.8 0.131 0.25 0.12 0.01 0.03 0.00
26 130 2.17 0.9 0.147 0.25 0.13 0.01 0.03 0.00
27 135 2.25 0.9 0.147 0.25 0.13 0.01 0.03 0.00
28 140 2.33 0.9 0.147 0.25 0.13 0.01 0.03 0.00
29 145 2.42 0.9 0.147 0.25 0.13 0.01 0.03 0.00
30 150 2.50 0.9 0.147 0.25 0.13 0.01 0.03 0.00
31 155 2.58 0.9 0.147 0.25 0.13 0.01 0.03 0.00
32 160 2.67 0.9 0.147 0.25 0.13 0.01 0.03 0.00
33 165 2.75 1.0 0.163 0.25 0.15 0.02 0.03 0.00
34 170 2.83 1.0 0.163 0.25 0.15 0.02 0.03 0.00
35 175 2.92 1.0 0.163 0.25 0.15 0.02 0.03 0.00
36 180 3.00 1.0 0.163 0.25 0.15 0.02 0.03 0.00
37 185 3.08 1.0 0.163 0.25 0.15 0.02 0.03 0.00
38 190 3.17 1.1 0.180 0.25 0.16 0.02 0.04 0.00
39 195 3.25 1.1 0.180 0.25 0.16 0.02 0.04 0.00
40 200 3.33 1.1 0.180 0.25 0.16 0.02 0.04 0.00
41 205 3.42 1.2 0.196 0.25 0.18 0.02 0.04 0.00
42 210 3.50 1.3 0.212 0.25 0.19 0.02 0.04 0.00
43 215 3.58 1.4 0.228 0.25 0.21 0.02 0.05 0.00
44 220 3.67 1.4 0.228 0.25 0.21 0.02 0.05 0.00
45 225 3.75 1.5 0.245 0.25 0.22 0.02 0.05 0.69
46 230 3.83 1.5 0.245 0.25 0.22 0.02 0.05 0.69
47 235 3.92 1.6 0.261 0.25 0.24 0.02 0.03 0.00
48 240 4.00 1.6 0.261 0.25 0.24 0.02 0.03 0.00
49 245 4.08 1.7 0.277 0.25 0.25 0.03 0.06 5.33
50 250 4.17 1.8 0.294 0.25 0.26 0.05 0.10 15.17
51 255 4.25 1.9 0.310 0.25 0.28 0.06 0.13 25.02
52 260 4.33 2.0 0.326 0.25 0.29 0.08 0.16 34.86
53 265 4.42 2.1 0.343 0.25 0.31 0.10 0.20 44.70
54 270 4.50 2.1 0.343 0.25 0.31 0.10 0.20 44.70
55 275 4.58 2.2 0.359 0.25 0.32 0.11 0.23 54.54
56 280 4.67 2.3 0.375 0.25 0.34 0.13 0.26 64.38

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

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Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.392 0.25 0.35 0.15 0.29 74.22
58 290 4.83 2.4 0.392 0.25 0.35 0.15 0.29 74.22
59 295 4.92 2.5 0.408 0.25 0.37 0.16 0.33 84.06
60 300 5.00 2.6 0.424 0.25 0.38 0.18 0.36 93.90
61 305 5.08 3.1 0.506 0.25 0.46 0.26 0.52 143.11
62 310 5.17 3.6 0.588 0.25 0.53 0.34 0.69 192.31
63 315 5.25 3.9 0.636 0.25 0.57 0.39 0.79 221.83
64 320 5.33 4.2 0.685 0.25 0.62 0.44 0.88 251.36
65 325 5.42 4.7 0.767 0.25 0.69 0.52 1.05 300.56
66 330 5.50 5.6 0.914 0.25 0.82 0.67 1.34 389.13
67 335 5.58 1.9 0.310 0.25 0.28 0.06 0.13 25.02
68 340 5.67 0.9 0.147 0.25 0.13 0.01 0.03 0.00
69 345 5.75 0.6 0.098 0.25 0.09 0.01 0.02 0.00
70 350 5.83 0.5 0.082 0.25 0.07 0.01 0.02 0.00
71 355 5.92 0.3 0.049 0.25 0.04 0.00 0.01 0.00
72 360 6.00 0.2 0.033 0.25 0.03 0.00 0.01 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.39
FLOOD VOLUME (acft) 0.07
FLOOD VOLUME (cuft) 2879.82
REQUIRED STORAGE (acft) 0.05
REQUIRED STORAGE (cuft) 2139.79
PEAK FLOW RATE (cfs) 1.34
Plate E-2.2

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Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 2.010 CONSTANT LOSS RATE-in/hr n/a
UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2453 LAG TIME - MINUTES 1.00 MINIMUM LOSS RATE (for var. loss) - in/hr 0.123 UNIT TIME-PERCENT OF LAG 1507.5 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00227
PERCOLATION RATE (cfs) 0.05
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.018 0.433 0.016 0.002 0.00 0.00
2 30 0.50 0.3 0.027 0.428 0.024 0.003 0.01 0.00
3 45 0.75 0.3 0.027 0.423 0.024 0.003 0.01 0.00
4 60 1.00 0.4 0.036 0.418 0.032 0.004 0.01 0.00
5 75 1.25 0.3 0.027 0.413 0.024 0.003 0.01 0.00
6 90 1.50 0.3 0.027 0.408 0.024 0.003 0.01 0.00
7 105 1.75 0.3 0.027 0.403 0.024 0.003 0.01 0.00
8 120 2.00 0.4 0.036 0.399 0.032 0.004 0.01 0.00
9 135 2.25 0.4 0.036 0.394 0.032 0.004 0.01 0.00
10 150 2.50 0.4 0.036 0.389 0.032 0.004 0.01 0.00
11 165 2.75 0.5 0.045 0.384 0.040 0.004 0.01 0.00
12 180 3.00 0.5 0.045 0.379 0.040 0.004 0.01 0.00
13 195 3.25 0.5 0.045 0.375 0.040 0.004 0.01 0.00
14 210 3.50 0.5 0.045 0.370 0.040 0.004 0.01 0.00
15 225 3.75 0.5 0.045 0.365 0.040 0.004 0.01 0.00
16 240 4.00 0.6 0.054 0.361 0.048 0.005 0.01 0.00
17 255 4.25 0.6 0.054 0.356 0.048 0.005 0.01 0.00
18 270 4.50 0.7 0.062 0.352 0.056 0.006 0.01 0.00
19 285 4.75 0.7 0.062 0.347 0.056 0.006 0.01 0.00
20 300 5.00 0.8 0.071 0.343 0.064 0.007 0.01 0.00
21 315 5.25 0.6 0.054 0.338 0.048 0.005 0.01 0.00
22 330 5.50 0.7 0.062 0.334 0.056 0.006 0.01 0.00
23 345 5.75 0.8 0.071 0.330 0.064 0.007 0.01 0.00
24 360 6.00 0.8 0.071 0.325 0.064 0.007 0.01 0.00
25 375 6.25 0.9 0.080 0.321 0.072 0.008 0.02 0.00
26 390 6.50 0.9 0.080 0.317 0.072 0.008 0.02 0.00
27 405 6.75 1.0 0.089 0.312 0.080 0.009 0.02 0.00
28 420 7.00 1.0 0.089 0.308 0.080 0.009 0.02 0.00
29 435 7.25 1.0 0.089 0.304 0.080 0.009 0.02 0.00
30 450 7.50 1.1 0.098 0.300 0.088 0.010 0.02 0.00
31 465 7.75 1.2 0.107 0.296 0.096 0.011 0.02 0.00
32 480 8.00 1.3 0.116 0.292 0.104 0.012 0.02 0.00
33 495 8.25 1.5 0.134 0.288 0.120 0.013 0.03 0.00
34 510 8.50 1.5 0.134 0.284 0.120 0.013 0.03 0.00
35 525 8.75 1.6 0.143 0.280 0.128 0.014 0.03 0.00
36 540 9.00 1.7 0.152 0.276 0.136 0.015 0.03 0.00
37 555 9.25 1.9 0.169 0.272 0.153 0.017 0.03 0.00
38 570 9.50 2.0 0.178 0.268 0.161 0.018 0.04 0.00
39 585 9.75 2.1 0.187 0.264 0.169 0.019 0.04 0.00
40 600 10.00 2.2 0.196 0.260 0.177 0.020 0.04 0.00
41 615 10.25 1.5 0.134 0.256 0.120 0.013 0.03 0.00
42 630 10.50 1.5 0.134 0.253 0.120 0.013 0.03 0.00
43 645 10.75 2.0 0.178 0.249 0.161 0.018 0.04 0.00
44 660 11.00 2.0 0.178 0.245 0.161 0.018 0.04 0.00
45 675 11.25 1.9 0.169 0.242 0.153 0.017 0.03 0.00
46 690 11.50 1.9 0.169 0.238 0.153 0.017 0.03 0.00
47 705 11.75 1.7 0.152 0.235 0.136 0.015 0.03 0.00
48 720 12.00 1.8 0.161 0.231 0.145 0.016 0.03 0.00
49 735 12.25 2.5 0.223 0.228 0.201 0.022 0.04 0.00
50 750 12.50 2.6 0.232 0.224 0.209 0.008 0.02 0.00
51 765 12.75 2.8 0.250 0.221 0.225 0.029 0.06 9.79
52 780 13.00 2.9 0.259 0.218 0.233 0.041 0.08 31.95
53 795 13.25 3.4 0.303 0.214 0.273 0.089 0.18 118.58
54 810 13.50 3.4 0.303 0.211 0.273 0.092 0.19 124.46
55 825 13.75 2.3 0.205 0.208 0.185 0.021 0.04 0.00
56 840 14.00 2.3 0.205 0.205 0.185 0.000 0.00 0.00
57 855 14.25 2.7 0.241 0.202 0.217 0.039 0.08 28.68
58 870 14.50 2.6 0.232 0.199 0.209 0.033 0.07 18.11
59 885 14.75 2.6 0.232 0.196 0.209 0.036 0.07 23.61
60 900 15.00 2.5 0.223 0.193 0.201 0.030 0.06 12.88
61 915 15.25 2.4 0.214 0.190 0.193 0.024 0.05 2.07
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

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Item 33.

EFFECTIVE RAIN CALCULATION FORM
62 930 15.50 2.3 0.205 0.187 0.185 0.018 0.04 0.00
63 945 15.75 1.9 0.169 0.184 0.153 0.017 0.03 0.00
64 960 16.00 1.9 0.169 0.181 0.153 0.017 0.03 0.00
65 975 16.25 0.4 0.036 0.178 0.032 0.004 0.01 0.00
66 990 16.50 0.4 0.036 0.176 0.032 0.004 0.01 0.00
67 1005 16.75 0.3 0.027 0.173 0.024 0.003 0.01 0.00
68 1020 17.00 0.3 0.027 0.170 0.024 0.003 0.01 0.00
69 1035 17.25 0.5 0.045 0.168 0.040 0.004 0.01 0.00
70 1050 17.50 0.5 0.045 0.165 0.040 0.004 0.01 0.00
71 1065 17.75 0.5 0.045 0.163 0.040 0.004 0.01 0.00
72 1080 18.00 0.4 0.036 0.160 0.032 0.004 0.01 0.00
73 1095 18.25 0.4 0.036 0.158 0.032 0.004 0.01 0.00
74 1110 18.50 0.4 0.036 0.156 0.032 0.004 0.01 0.00
75 1125 18.75 0.3 0.027 0.153 0.024 0.003 0.01 0.00
76 1140 19.00 0.2 0.018 0.151 0.016 0.002 0.00 0.00
77 1155 19.25 0.3 0.027 0.149 0.024 0.003 0.01 0.00
78 1170 19.50 0.4 0.036 0.147 0.032 0.004 0.01 0.00
79 1185 19.75 0.3 0.027 0.145 0.024 0.003 0.01 0.00
80 1200 20.00 0.2 0.018 0.143 0.016 0.002 0.00 0.00
81 1215 20.25 0.3 0.027 0.141 0.024 0.003 0.01 0.00
82 1230 20.50 0.3 0.027 0.139 0.024 0.003 0.01 0.00
83 1245 20.75 0.3 0.027 0.138 0.024 0.003 0.01 0.00
84 1260 21.00 0.2 0.018 0.136 0.016 0.002 0.00 0.00
85 1275 21.25 0.3 0.027 0.134 0.024 0.003 0.01 0.00
86 1290 21.50 0.2 0.018 0.133 0.016 0.002 0.00 0.00
87 1305 21.75 0.3 0.027 0.131 0.024 0.003 0.01 0.00
88 1320 22.00 0.2 0.018 0.130 0.016 0.002 0.00 0.00
89 1335 22.25 0.3 0.027 0.129 0.024 0.003 0.01 0.00
90 1350 22.50 0.2 0.018 0.127 0.016 0.002 0.00 0.00
91 1365 22.75 0.2 0.018 0.126 0.016 0.002 0.00 0.00
92 1380 23.00 0.2 0.018 0.125 0.016 0.002 0.00 0.00
93 1395 23.25 0.2 0.018 0.124 0.016 0.002 0.00 0.00
94 1410 23.50 0.2 0.018 0.124 0.016 0.002 0.00 0.00
95 1425 23.75 0.2 0.018 0.123 0.016 0.002 0.00 0.00
96 1440 24.00 0.2 0.018 0.123 0.016 0.002 0.00 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.26
FLOOD VOLUME (acft) 0.04
FLOOD VOLUME (cuft) 1902.84
REQUIRED STORAGE (acft) 0.01
REQUIRED STORAGE (cuft) 370.13
PEAK FLOW (cfs) 0.19
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

INCR TOTAL INCR TOTAL INCR TOTAL
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
465 0 0 3025 0 0 0.00
466 1 1 675 3700 3363 3363 0.08
467 1 2 730 4430 4065 7428 0.17
468 1 3 785 5215 4823 12250 0.28
468.5 0.5 3.5 415 5630 2711 14961 0.34

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.05 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.05 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.03 10 10 14 - 465.00 - 0.00
2 10 0.03 10 10 14 - 465.00 - 0.00
3 15 0.03 8 8 14 - 465.00 - 0.00
4 20 0.04 11 11 14 - 465.00 - 0.00
5 25 0.04 11 11 14 - 465.00 - 0.00
6 30 0.05 14 14 14 - 465.00 - 0.00
7 35 0.04 11 11 14 - 465.00 - 0.00
8 40 0.05 14 14 14 - 465.00 - 0.00
9 45 0.05 14 14 14 - 465.00 - 0.00
10 50 0.04 11 11 14 - 465.00 - 0.00
11 55 0.04 12 12 14 - 465.00 - 0.00
12 60 0.05 14 14 14 - 465.00 - 0.00
13 65 0.06 18 18 14 4 465.00 0.00 4
14 70 0.06 18 21 14 7 465.00 0.00 7
15 75 0.06 18 25 14 11 465.00 11 0.00
16 80 0.01 3 13 14 - 465.00 - 0.00
17 85 0.16 48 48 14 34 465.01 34 0.00
18 90 0.18 55 89 14 75 465.02 75 0.00
19 95 0.11 33 108 14 94 465.03 94 0.00
20 100 0.18 55 149 14 135 465.04 135 0.00
21 105 0.33 100 235 14 221 465.07 221 0.01
22 110 0.28 85 307 14 292 465.09 292 0.01
23 115 0.23 70 363 14 349 465.10 349 0.01
24 120 0.26 78 427 14 413 465.12 413 0.01
25 125 0.28 85 498 14 484 465.14 484 0.01
26 130 0.56 168 652 14 638 465.19 638 0.01
27 135 0.76 228 866 14 852 465.25 852 0.02
28 140 0.39 116 968 14 954 465.28 954 0.02
29 145 1.21 364 1,318 14 1,304 465.39 1,304 0.03
30 150 1.34 401 1,705 14 1,691 465.50 1,691 0.04
31 155 1.56 469 2,160 14 2,146 465.64 2,146 0.05
32 160 0.99 296 2,442 14 2,428 465.72 2,428 0.06
33 165 0.01 3 2,431 14 2,417 465.72 2,417 0.06
34 170 0.05 14 2,430 14 2,416 465.72 2,416 0.06
35 175 0.05 14 2,430 14 2,416 465.72 2,416 0.06
36 180 0.02 5 2,420 14 2,406 465.72 2,406 0.06

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.02 5 5 14 - 465.00 - 0.00
2 10 0.02 6 6 14 - 465.00 - 0.00
3 15 0.02 6 6 14 - 465.00 - 0.00
4 20 0.02 6 6 14 - 465.00 - 0.00
5 25 0.02 6 6 14 - 465.00 - 0.00
6 30 0.02 7 7 14 - 465.00 - 0.00
7 35 0.02 7 7 14 - 465.00 - 0.00
8 40 0.02 7 7 14 - 465.00 - 0.00
9 45 0.02 7 7 14 - 465.00 - 0.00
10 50 0.02 7 7 14 - 465.00 - 0.00
11 55 0.02 7 7 14 - 465.00 - 0.00
12 60 0.03 8 8 14 - 465.00 - 0.00
13 65 0.03 8 8 14 - 465.00 - 0.00
14 70 0.03 8 8 14 - 465.00 - 0.00
15 75 0.03 8 8 14 - 465.00 - 0.00
16 80 0.03 8 8 14 - 465.00 - 0.00
17 85 0.03 8 8 14 - 465.00 - 0.00
18 90 0.03 8 8 14 - 465.00 - 0.00
19 95 0.03 8 8 14 - 465.00 - 0.00
20 100 0.03 8 8 14 - 465.00 - 0.00
21 105 0.03 8 8 14 - 465.00 - 0.00
22 110 0.03 8 8 14 - 465.00 - 0.00
23 115 0.03 8 8 14 - 465.00 - 0.00
24 120 0.03 9 9 14 - 465.00 - 0.00
25 125 0.03 8 8 14 - 465.00 - 0.00
26 130 0.03 9 9 14 - 465.00 - 0.00
27 135 0.03 9 9 14 - 465.00 - 0.00
28 140 0.03 9 9 14 - 465.00 - 0.00
29 145 0.03 9 9 14 - 465.00 - 0.00
30 150 0.03 9 9 14 - 465.00 - 0.00
31 155 0.03 9 9 14 - 465.00 - 0.00
32 160 0.03 9 9 14 - 465.00 - 0.00
33 165 0.03 10 10 14 - 465.00 - 0.00
34 170 0.03 10 10 14 - 465.00 - 0.00
35 175 0.03 10 10 14 - 465.00 - 0.00
36 180 0.03 10 10 14 - 465.00 - 0.00
37 185 0.03 10 10 14 - 465.00 - 0.00
38 190 0.04 11 11 14 - 465.00 - 0.00
39 195 0.04 11 11 14 - 465.00 - 0.00
40 200 0.04 11 11 14 - 465.00 - 0.00
41 205 0.04 12 12 14 - 465.00 - 0.00
42 210 0.04 13 13 14 - 465.00 - 0.00
43 215 0.05 14 14 14 - 465.00 - 0.00
44 220 0.05 14 14 14 - 465.00 - 0.00
45 225 0.05 15 15 14 1 465.00 0.00 1
46 230 0.05 15 15 14 1 465.00 0.00 1
47 235 0.03 10 11 14 - 465.00 - 0.00
48 240 0.03 10 10 14 - 465.00 - 0.00
49 245 0.06 19 19 14 5 465.00 0.00 5
50 250 0.10 29 35 14 21 465.01 21 0.00
51 255 0.13 39 60 14 46 465.01 46 0.00
52 260 0.16 49 94 14 80 465.02 80 0.00
53 265 0.20 59 139 14 125 465.04 125 0.00
54 270 0.20 59 184 14 170 465.05 170 0.00
55 275 0.23 69 238 14 224 465.07 224 0.01

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 0.26 78 303 14 289 465.09 289 0.01
57 285 0.29 88 377 14 363 465.11 363 0.01
58 290 0.29 88 451 14 437 465.13 437 0.01
59 295 0.33 98 535 14 521 465.16 521 0.01
60 300 0.36 108 629 14 615 465.18 615 0.01
61 305 0.52 157 772 14 758 465.23 758 0.02
62 310 0.69 206 965 14 951 465.28 951 0.02
63 315 0.79 236 1,186 14 1,172 465.35 1,172 0.03
64 320 0.88 265 1,438 14 1,424 465.42 1,424 0.03
65 325 1.05 315 1,738 14 1,724 465.51 1,724 0.04
66 330 1.34 403 2,127 14 2,113 465.63 2,113 0.05
67 335 0.13 39 2,152 14 2,138 465.64 2,138 0.05
68 340 0.03 9 2,147 14 2,133 465.63 2,133 0.05
69 345 0.02 6 2,139 14 2,125 465.63 2,125 0.05
70 350 0.02 5 2,130 14 2,116 465.63 2,116 0.05
71 355 0.01 3 2,119 14 2,105 465.63 2,105 0.05
72 360 0.01 2 2,107 14 2,093 465.62 2,093 0.05
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.00 3 3 42 - 465.00 - 0.00
2 30 0.01 5 5 42 - 465.00 - 0.00
3 45 0.01 5 5 42 - 465.00 - 0.00
4 60 0.01 6 6 42 - 465.00 - 0.00
5 75 0.01 5 5 42 - 465.00 - 0.00
6 90 0.01 5 5 42 - 465.00 - 0.00
7 105 0.01 5 5 42 - 465.00 - 0.00
8 120 0.01 6 6 42 - 465.00 - 0.00
9 135 0.01 6 6 42 - 465.00 - 0.00
10 150 0.01 6 6 42 - 465.00 - 0.00
11 165 0.01 8 8 42 - 465.00 - 0.00
12 180 0.01 8 8 42 - 465.00 - 0.00
13 195 0.01 8 8 42 - 465.00 - 0.00
14 210 0.01 8 8 42 - 465.00 - 0.00
15 225 0.01 8 8 42 - 465.00 - 0.00
16 240 0.01 10 10 42 - 465.00 - 0.00
17 255 0.01 10 10 42 - 465.00 - 0.00
18 270 0.01 11 11 42 - 465.00 - 0.00
19 285 0.01 11 11 42 - 465.00 - 0.00
20 300 0.01 13 13 42 - 465.00 - 0.00
21 315 0.01 10 10 42 - 465.00 - 0.00
22 330 0.01 11 11 42 - 465.00 - 0.00
23 345 0.01 13 13 42 - 465.00 - 0.00
24 360 0.01 13 13 42 - 465.00 - 0.00
25 375 0.02 15 15 42 - 465.00 - 0.00
26 390 0.02 15 15 42 - 465.00 - 0.00
27 405 0.02 16 16 42 - 465.00 - 0.00
28 420 0.02 16 16 42 - 465.00 - 0.00
29 435 0.02 16 16 42 - 465.00 - 0.00
30 450 0.02 18 18 42 - 465.00 - 0.00
31 465 0.02 19 19 42 - 465.00 - 0.00
32 480 0.02 21 21 42 - 465.00 - 0.00
33 495 0.03 24 24 42 - 465.00 - 0.00
34 510 0.03 24 24 42 - 465.00 - 0.00
35 525 0.03 26 26 42 - 465.00 - 0.00
36 540 0.03 27 27 42 - 465.00 - 0.00
37 555 0.03 31 31 42 - 465.00 - 0.00
38 570 0.04 32 32 42 - 465.00 - 0.00
39 585 0.04 34 34 42 - 465.00 - 0.00
40 600 0.04 35 35 42 - 465.00 - 0.00
41 615 0.03 24 24 42 - 465.00 - 0.00
42 630 0.03 24 24 42 - 465.00 - 0.00
43 645 0.04 32 32 42 - 465.00 - 0.00
44 660 0.04 32 32 42 - 465.00 - 0.00
45 675 0.03 31 31 42 - 465.00 - 0.00
46 690 0.03 31 31 42 - 465.00 - 0.00
47 705 0.03 27 27 42 - 465.00 - 0.00
48 720 0.03 29 29 42 - 465.00 - 0.00
49 735 0.04 40 40 42 - 465.00 - 0.00
50 750 0.02 14 14 42 - 465.00 - 0.00
51 765 0.06 52 52 42 10 465.00 10 0.00
52 780 0.08 74 84 42 42 465.01 42 0.00
53 795 0.18 161 203 42 160 465.05 160 0.00
54 810 0.19 167 327 42 285 465.08 285 0.01
55 825 0.04 37 322 42 280 465.08 280 0.01
56 840 0.00 1 280 42 238 465.07 238 0.01
57 855 0.08 71 309 42 267 465.08 267 0.01
58 870 0.07 60 327 42 285 465.08 285 0.01

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.07 66 351 42 309 465.09 309 0.01
60 900 0.06 55 364 42 321 465.10 321 0.01
61 915 0.05 44 366 42 324 465.10 324 0.01
62 930 0.04 33 357 42 315 465.09 315 0.01
63 945 0.03 31 345 42 303 465.09 303 0.01
64 960 0.03 31 334 42 292 465.09 292 0.01
65 975 0.01 6 298 42 256 465.08 256 0.01
66 990 0.01 6 262 42 220 465.07 220 0.01
67 1005 0.01 5 225 42 183 465.05 183 0.00
68 1020 0.01 5 187 42 145 465.04 145 0.00
69 1035 0.01 8 153 42 111 465.03 111 0.00
70 1050 0.01 8 119 42 77 465.02 77 0.00
71 1065 0.01 8 85 42 43 465.01 43 0.00
72 1080 0.01 6 49 42 7 465.00 7 0.00
73 1095 0.01 6 13 42 - 465.00 - 0.00
74 1110 0.01 6 6 42 - 465.00 - 0.00
75 1125 0.01 5 5 42 - 465.00 - 0.00
76 1140 0.00 3 3 42 - 465.00 - 0.00
77 1155 0.01 5 5 42 - 465.00 - 0.00
78 1170 0.01 6 6 42 - 465.00 - 0.00
79 1185 0.01 5 5 42 - 465.00 - 0.00
80 1200 0.00 3 3 42 - 465.00 - 0.00
81 1215 0.01 5 5 42 - 465.00 - 0.00
82 1230 0.01 5 5 42 - 465.00 - 0.00
83 1245 0.01 5 5 42 - 465.00 - 0.00
84 1260 0.00 3 3 42 - 465.00 - 0.00
85 1275 0.01 5 5 42 - 465.00 - 0.00
86 1290 0.00 3 3 42 - 465.00 - 0.00
87 1305 0.01 5 5 42 - 465.00 - 0.00
88 1320 0.00 3 3 42 - 465.00 - 0.00
89 1335 0.01 5 5 42 - 465.00 - 0.00
90 1350 0.00 3 3 42 - 465.00 - 0.00
91 1365 0.00 3 3 42 - 465.00 - 0.00
92 1380 0.00 3 3 42 - 465.00 - 0.00
93 1395 0.00 3 3 42 - 465.00 - 0.00
94 1410 0.00 3 3 42 - 465.00 - 0.00
95 1425 0.00 3 3 42 - 465.00 - 0.00
96 1440 0.00 3 3 42 - 465.00 - 0.00
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 2

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.51
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 7.46

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 0.6

RETENTION BASIN

GOLF COURSE

MOUNTAINOUS
LOW LOSS RATE (PERCENT) 90%
LENGTH OF WATERCOURSE (L) 724
LENGTH TO POINT OPPOSITE CENTROID (Lca) 100
ELEVATION OF HEADWATER 472
ELEVATION OF CONCENTRATION POINT 468.5
AVERAGE MANNINGS 'N' VALUE 0.02
STORM FREQUENCY (YEAR) 100

POINT RAIN
3-HOUR 1.04
6-HOUR 1.36
24-HOUR 2.23
BASIN CHARACTERISTICS: ELEVATION AREA
465 15600
466 17120
467 18710
468 20350
468.5 21200
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 952 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

1.04 10.570 1.00 1.04 1.36 10.570 1.00 1.36 2.23 10.570 1.00 2.23

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 10.57 SUM [7] 1.04 SUM [9] 10.57 SUM [11] 1.36 SUM [13] 10.57 SUM [15] 2.23 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 1.04 1.36 2.23
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 0.49 0.49 0.40
FLOOD VOLUME (cu-ft) 18,821 18,747 15,460
(acre-ft) 0.43 0.43 0.35
REQUIRED STORAGE (cu-ft) 16,281 14,878 6,850
(acre-ft) 0.37 0.34 0.16
PEAK FLOW (cfs) 8.76 7.61 1.44
MAXIMUM WSEL (ft) 465.99 465.91 465.42
24-HOURS
[15] LAG TIME-HOURS
[16] LAG TIME-MINUTES

0.24 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS 6-HOURS
[6] La-FEET
[7] La-MILES
[8] ELEVATION OF HEADWATER
[9] ELEVATION OF CONCENTRATION POINT
[2] AREA DESIGNATION
[3] AREA - ACRES
[4] L-FEET
[5] L-MILES
5 0.03

1.6 1.6

3.2 25.5

5.05 0.02

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 2

10.570
724

0.019
472
468.5

0.137
100.00

0.001
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 3.5
[11] S-FEET/MILE
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 10 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

RATE IMPERVIOUS RATE
(in/hr) (in/hr) (in/hr)
[Plate C-1] [Plate E-6.1] [Plate E-6.2] [Plate E-6.3]
B 56 0.52 90% 0.10 0.00 0.000 0.0000
B 56 0.52 100% 0.05 2.51 0.237 0.0123
B 56 0.52 20% 0.43 0.00 0.000 0.0000B 56 0.52 40% 0.33 0.00 0.000 0.0000B 56 0.52 50% 0.29 0.00 0.000 0.0000B 56 0.52 65% 0.22 7.46 0.706 0.1523B 56 0.52 80% 0.15 0.00 0.000 0.0000B 56 0.52 75% 0.17 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.60 0.057 0.0295B 56 0.52 0% 0.52 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.00 0.000 0.0000 D 93 0.95 90% 0.18 0.00 0.000 0.0000

0.00 0.000 0.0000

0.00 0.000 0.0000
SUM 10.57 SUM 0.1942
VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY)Fm= 0.097085525C= 0.00180Ft=C(24-(T/60))^1.55 = 0.00180 0.10 in/hr LOW LOSS RATE (80-90 PERCENT) = 90%Where:T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,T=1 1/2 unit time for the second period, etc.

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS
(24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 10.57
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.62
UNIT TIME-PERCENT OF LAG 308.6
TOTAL ADJUSTED STORM RAIN-INCHES 1.04
CONSTANT LOSS RATE-in/hr 0.19
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.24 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.162 0.19 0.15 0.02 0.17 0.00
2 10 0.17 1.3 0.162 0.19 0.15 0.02 0.17 0.00
3 15 0.25 1.1 0.137 0.19 0.12 0.01 0.15 0.00
4 20 0.33 1.5 0.187 0.19 0.17 0.02 0.20 0.00
5 25 0.42 1.5 0.187 0.19 0.17 0.02 0.20 0.00
6 30 0.50 1.8 0.225 0.19 0.20 0.03 0.32 24.03
7 35 0.58 1.5 0.187 0.19 0.17 0.02 0.20 0.00
8 40 0.67 1.8 0.225 0.19 0.20 0.03 0.32 24.03
9 45 0.75 1.8 0.225 0.19 0.20 0.03 0.32 24.03
10 50 0.83 1.5 0.187 0.19 0.17 0.02 0.20 0.00
11 55 0.92 1.6 0.200 0.19 0.18 0.01 0.06 0.00
12 60 1.00 1.8 0.225 0.19 0.20 0.03 0.32 24.03
13 65 1.08 2.2 0.275 0.19 0.25 0.08 0.85 182.33
14 70 1.17 2.2 0.275 0.19 0.25 0.08 0.85 182.33
15 75 1.25 2.2 0.275 0.19 0.25 0.08 0.85 182.33
16 80 1.33 2.0 0.250 0.19 0.22 0.06 0.59 103.18
17 85 1.42 2.6 0.324 0.19 0.29 0.13 1.38 340.63
18 90 1.50 2.7 0.337 0.19 0.30 0.14 1.51 380.20
19 95 1.58 2.4 0.300 0.19 0.27 0.11 1.11 261.48
20 100 1.67 2.7 0.337 0.19 0.30 0.14 1.51 380.20
21 105 1.75 3.3 0.412 0.19 0.37 0.22 2.30 617.64
22 110 1.83 3.1 0.387 0.19 0.35 0.19 2.04 538.50
23 115 1.92 2.9 0.362 0.19 0.33 0.17 1.77 459.35
24 120 2.00 3.0 0.374 0.19 0.34 0.18 1.91 498.92
25 125 2.08 3.1 0.387 0.19 0.35 0.19 2.04 538.50
26 130 2.17 4.2 0.524 0.19 0.47 0.33 3.49 973.81
27 135 2.25 5.0 0.624 0.19 0.56 0.43 4.54 1290.40
28 140 2.33 3.5 0.437 0.19 0.39 0.24 2.56 696.79
29 145 2.42 6.8 0.849 0.19 0.76 0.65 6.92 2002.74
30 150 2.50 7.3 0.911 0.19 0.82 0.72 7.58 2200.61
31 155 2.58 8.2 1.023 0.19 0.92 0.83 8.76 2556.77
32 160 2.67 5.9 0.736 0.19 0.66 0.54 5.73 1646.57
33 165 2.75 2.0 0.250 0.19 0.22 0.06 0.59 103.18
34 170 2.83 1.8 0.225 0.19 0.20 0.03 0.32 24.03
35 175 2.92 1.8 0.225 0.19 0.20 0.03 0.32 24.03
36 180 3.00 0.6 0.075 0.19 0.07 0.01 0.08 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.49
FLOOD VOLUME (acft) 0.43
FLOOD VOLUME (cuft) 18821.12
REQUIRED STORAGE (acft) 0.37
REQUIRED STORAGE (cuft) 16280.67
PEAK FLOW RATE (cfs) 8.76
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.57
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.62
UNIT TIME-PERCENT OF LAG 308.6
TOTAL ADJUSTED STORM RAIN-INCHES 1.36
CONSTANT LOSS RATE-in/hr 0.194
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.24 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.082 0.19 0.07 0.01 0.09 0.00
2 10 0.17 0.6 0.098 0.19 0.09 0.01 0.10 0.00
3 15 0.25 0.6 0.098 0.19 0.09 0.01 0.10 0.00
4 20 0.33 0.6 0.098 0.19 0.09 0.01 0.10 0.00
5 25 0.42 0.6 0.098 0.19 0.09 0.01 0.10 0.00
6 30 0.50 0.7 0.114 0.19 0.10 0.01 0.12 0.00
7 35 0.58 0.7 0.114 0.19 0.10 0.01 0.12 0.00
8 40 0.67 0.7 0.114 0.19 0.10 0.01 0.12 0.00
9 45 0.75 0.7 0.114 0.19 0.10 0.01 0.12 0.00
10 50 0.83 0.7 0.114 0.19 0.10 0.01 0.12 0.00
11 55 0.92 0.7 0.114 0.19 0.10 0.01 0.12 0.00
12 60 1.00 0.8 0.131 0.19 0.12 0.01 0.14 0.00
13 65 1.08 0.8 0.131 0.19 0.12 0.01 0.14 0.00
14 70 1.17 0.8 0.131 0.19 0.12 0.01 0.14 0.00
15 75 1.25 0.8 0.131 0.19 0.12 0.01 0.14 0.00
16 80 1.33 0.8 0.131 0.19 0.12 0.01 0.14 0.00
17 85 1.42 0.8 0.131 0.19 0.12 0.01 0.14 0.00
18 90 1.50 0.8 0.131 0.19 0.12 0.01 0.14 0.00
19 95 1.58 0.8 0.131 0.19 0.12 0.01 0.14 0.00
20 100 1.67 0.8 0.131 0.19 0.12 0.01 0.14 0.00
21 105 1.75 0.8 0.131 0.19 0.12 0.01 0.14 0.00
22 110 1.83 0.8 0.131 0.19 0.12 0.01 0.14 0.00
23 115 1.92 0.8 0.131 0.19 0.12 0.01 0.14 0.00
24 120 2.00 0.9 0.147 0.19 0.13 0.01 0.16 0.00
25 125 2.08 0.8 0.131 0.19 0.12 0.01 0.14 0.00
26 130 2.17 0.9 0.147 0.19 0.13 0.01 0.16 0.00
27 135 2.25 0.9 0.147 0.19 0.13 0.01 0.16 0.00
28 140 2.33 0.9 0.147 0.19 0.13 0.01 0.16 0.00
29 145 2.42 0.9 0.147 0.19 0.13 0.01 0.16 0.00
30 150 2.50 0.9 0.147 0.19 0.13 0.01 0.16 0.00
31 155 2.58 0.9 0.147 0.19 0.13 0.01 0.16 0.00
32 160 2.67 0.9 0.147 0.19 0.13 0.01 0.16 0.00
33 165 2.75 1.0 0.163 0.19 0.15 0.02 0.17 0.00
34 170 2.83 1.0 0.163 0.19 0.15 0.02 0.17 0.00
35 175 2.92 1.0 0.163 0.19 0.15 0.02 0.17 0.00
36 180 3.00 1.0 0.163 0.19 0.15 0.02 0.17 0.00
37 185 3.08 1.0 0.163 0.19 0.15 0.02 0.17 0.00
38 190 3.17 1.1 0.180 0.19 0.16 0.02 0.19 0.00
39 195 3.25 1.1 0.180 0.19 0.16 0.02 0.19 0.00
40 200 3.33 1.1 0.180 0.19 0.16 0.02 0.19 0.00
41 205 3.42 1.2 0.196 0.19 0.18 0.00 0.02 0.00
42 210 3.50 1.3 0.212 0.19 0.19 0.02 0.19 0.00
43 215 3.58 1.4 0.228 0.19 0.21 0.03 0.36 36.21
44 220 3.67 1.4 0.228 0.19 0.21 0.03 0.36 36.21
45 225 3.75 1.5 0.245 0.19 0.22 0.05 0.54 87.96
46 230 3.83 1.5 0.245 0.19 0.22 0.05 0.54 87.96
47 235 3.92 1.6 0.261 0.19 0.24 0.07 0.71 139.71
48 240 4.00 1.6 0.261 0.19 0.24 0.07 0.71 139.71
49 245 4.08 1.7 0.277 0.19 0.25 0.08 0.88 191.46
50 250 4.17 1.8 0.294 0.19 0.26 0.10 1.05 243.21
51 255 4.25 1.9 0.310 0.19 0.28 0.12 1.23 294.96
52 260 4.33 2.0 0.326 0.19 0.29 0.13 1.40 346.71
53 265 4.42 2.1 0.343 0.19 0.31 0.15 1.57 398.47
54 270 4.50 2.1 0.343 0.19 0.31 0.15 1.57 398.47
55 275 4.58 2.2 0.359 0.19 0.32 0.16 1.74 450.22
56 280 4.67 2.3 0.375 0.19 0.34 0.18 1.92 501.97

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.392 0.19 0.35 0.20 2.09 553.72
58 290 4.83 2.4 0.392 0.19 0.35 0.20 2.09 553.72
59 295 4.92 2.5 0.408 0.19 0.37 0.21 2.26 605.47
60 300 5.00 2.6 0.424 0.19 0.38 0.23 2.43 657.22
61 305 5.08 3.1 0.506 0.19 0.46 0.31 3.30 915.97
62 310 5.17 3.6 0.588 0.19 0.53 0.39 4.16 1174.73
63 315 5.25 3.9 0.636 0.19 0.57 0.44 4.68 1329.98
64 320 5.33 4.2 0.685 0.19 0.62 0.49 5.19 1485.23
65 325 5.42 4.7 0.767 0.19 0.69 0.57 6.06 1743.98
66 330 5.50 5.6 0.914 0.19 0.82 0.72 7.61 2209.74
67 335 5.58 1.9 0.310 0.19 0.28 0.12 1.23 294.96
68 340 5.67 0.9 0.147 0.19 0.13 0.01 0.16 0.00
69 345 5.75 0.6 0.098 0.19 0.09 0.01 0.10 0.00
70 350 5.83 0.5 0.082 0.19 0.07 0.01 0.09 0.00
71 355 5.92 0.3 0.049 0.19 0.04 0.00 0.05 0.00
72 360 6.00 0.2 0.033 0.19 0.03 0.00 0.03 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.49
FLOOD VOLUME (acft) 0.43
FLOOD VOLUME (cuft) 18747.03
REQUIRED STORAGE (acft) 0.34
REQUIRED STORAGE (cuft) 14877.95
PEAK FLOW RATE (cfs) 7.61
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.570 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.1942 LAG TIME - MINUTES 1.62 MINIMUM LOSS RATE (for var. loss) - in/hr 0.097 UNIT TIME-PERCENT OF LAG 925.8 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00180
PERCOLATION RATE (cfs) 0.24
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.018 0.343 0.016 0.002 0.02 0.00
2 30 0.50 0.3 0.027 0.339 0.024 0.003 0.03 0.00
3 45 0.75 0.3 0.027 0.335 0.024 0.003 0.03 0.00
4 60 1.00 0.4 0.036 0.331 0.032 0.004 0.04 0.00
5 75 1.25 0.3 0.027 0.327 0.024 0.003 0.03 0.00
6 90 1.50 0.3 0.027 0.323 0.024 0.003 0.03 0.00
7 105 1.75 0.3 0.027 0.319 0.024 0.003 0.03 0.00
8 120 2.00 0.4 0.036 0.316 0.032 0.004 0.04 0.00
9 135 2.25 0.4 0.036 0.312 0.032 0.004 0.04 0.00
10 150 2.50 0.4 0.036 0.308 0.032 0.004 0.04 0.00
11 165 2.75 0.5 0.045 0.304 0.040 0.004 0.05 0.00
12 180 3.00 0.5 0.045 0.300 0.040 0.004 0.05 0.00
13 195 3.25 0.5 0.045 0.297 0.040 0.004 0.05 0.00
14 210 3.50 0.5 0.045 0.293 0.040 0.004 0.05 0.00
15 225 3.75 0.5 0.045 0.289 0.040 0.004 0.05 0.00
16 240 4.00 0.6 0.054 0.286 0.048 0.005 0.06 0.00
17 255 4.25 0.6 0.054 0.282 0.048 0.005 0.06 0.00
18 270 4.50 0.7 0.062 0.278 0.056 0.006 0.07 0.00
19 285 4.75 0.7 0.062 0.275 0.056 0.006 0.07 0.00
20 300 5.00 0.8 0.071 0.271 0.064 0.007 0.08 0.00
21 315 5.25 0.6 0.054 0.268 0.048 0.005 0.06 0.00
22 330 5.50 0.7 0.062 0.264 0.056 0.006 0.07 0.00
23 345 5.75 0.8 0.071 0.261 0.064 0.007 0.08 0.00
24 360 6.00 0.8 0.071 0.257 0.064 0.007 0.08 0.00
25 375 6.25 0.9 0.080 0.254 0.072 0.008 0.08 0.00
26 390 6.50 0.9 0.080 0.251 0.072 0.008 0.08 0.00
27 405 6.75 1.0 0.089 0.247 0.080 0.009 0.09 0.00
28 420 7.00 1.0 0.089 0.244 0.080 0.009 0.09 0.00
29 435 7.25 1.0 0.089 0.241 0.080 0.009 0.09 0.00
30 450 7.50 1.1 0.098 0.237 0.088 0.010 0.10 0.00
31 465 7.75 1.2 0.107 0.234 0.096 0.011 0.11 0.00
32 480 8.00 1.3 0.116 0.231 0.104 0.012 0.12 0.00
33 495 8.25 1.5 0.134 0.228 0.120 0.013 0.14 0.00
34 510 8.50 1.5 0.134 0.224 0.120 0.013 0.14 0.00
35 525 8.75 1.6 0.143 0.221 0.128 0.014 0.15 0.00
36 540 9.00 1.7 0.152 0.218 0.136 0.015 0.16 0.00
37 555 9.25 1.9 0.169 0.215 0.153 0.017 0.18 0.00
38 570 9.50 2.0 0.178 0.212 0.161 0.018 0.19 0.00
39 585 9.75 2.1 0.187 0.209 0.169 0.019 0.20 0.00
40 600 10.00 2.2 0.196 0.206 0.177 0.020 0.21 0.00
41 615 10.25 1.5 0.134 0.203 0.120 0.013 0.14 0.00
42 630 10.50 1.5 0.134 0.200 0.120 0.013 0.14 0.00
43 645 10.75 2.0 0.178 0.197 0.161 0.018 0.19 0.00
44 660 11.00 2.0 0.178 0.194 0.161 0.018 0.19 0.00
45 675 11.25 1.9 0.169 0.191 0.153 0.017 0.18 0.00
46 690 11.50 1.9 0.169 0.189 0.153 0.017 0.18 0.00
47 705 11.75 1.7 0.152 0.186 0.136 0.015 0.16 0.00
48 720 12.00 1.8 0.161 0.183 0.145 0.016 0.17 0.00
49 735 12.25 2.5 0.223 0.180 0.201 0.043 0.45 188.01
50 750 12.50 2.6 0.232 0.178 0.209 0.054 0.57 298.56
51 765 12.75 2.8 0.250 0.175 0.225 0.075 0.79 493.67
52 780 13.00 2.9 0.259 0.172 0.233 0.086 0.91 603.61
53 795 13.25 3.4 0.303 0.170 0.273 0.134 1.41 1052.67
54 810 13.50 3.4 0.303 0.167 0.273 0.136 1.44 1077.14
55 825 13.75 2.3 0.205 0.165 0.185 0.041 0.43 167.88
56 840 14.00 2.3 0.205 0.162 0.185 0.043 0.45 191.72
57 855 14.25 2.7 0.241 0.160 0.217 0.081 0.86 554.66
58 870 14.50 2.6 0.232 0.157 0.209 0.075 0.79 492.99
59 885 14.75 2.6 0.232 0.155 0.209 0.077 0.82 515.85
60 900 15.00 2.5 0.223 0.152 0.201 0.071 0.75 453.52
61 915 15.25 2.4 0.214 0.150 0.193 0.064 0.68 390.86
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
62 930 15.50 2.3 0.205 0.148 0.185 0.057 0.61 327.85
63 945 15.75 1.9 0.169 0.146 0.153 0.024 0.25 9.93
64 960 16.00 1.9 0.169 0.143 0.153 0.026 0.28 31.09
65 975 16.25 0.4 0.036 0.141 0.032 0.004 0.04 0.00
66 990 16.50 0.4 0.036 0.139 0.032 0.004 0.04 0.00
67 1005 16.75 0.3 0.027 0.137 0.024 0.003 0.03 0.00
68 1020 17.00 0.3 0.027 0.135 0.024 0.003 0.03 0.00
69 1035 17.25 0.5 0.045 0.133 0.040 0.004 0.05 0.00
70 1050 17.50 0.5 0.045 0.131 0.040 0.004 0.05 0.00
71 1065 17.75 0.5 0.045 0.129 0.040 0.004 0.05 0.00
72 1080 18.00 0.4 0.036 0.127 0.032 0.004 0.04 0.00
73 1095 18.25 0.4 0.036 0.125 0.032 0.004 0.04 0.00
74 1110 18.50 0.4 0.036 0.123 0.032 0.004 0.04 0.00
75 1125 18.75 0.3 0.027 0.121 0.024 0.003 0.03 0.00
76 1140 19.00 0.2 0.018 0.120 0.016 0.002 0.02 0.00
77 1155 19.25 0.3 0.027 0.118 0.024 0.003 0.03 0.00
78 1170 19.50 0.4 0.036 0.116 0.032 0.004 0.04 0.00
79 1185 19.75 0.3 0.027 0.115 0.024 0.003 0.03 0.00
80 1200 20.00 0.2 0.018 0.113 0.016 0.002 0.02 0.00
81 1215 20.25 0.3 0.027 0.112 0.024 0.003 0.03 0.00
82 1230 20.50 0.3 0.027 0.110 0.024 0.003 0.03 0.00
83 1245 20.75 0.3 0.027 0.109 0.024 0.003 0.03 0.00
84 1260 21.00 0.2 0.018 0.108 0.016 0.002 0.02 0.00
85 1275 21.25 0.3 0.027 0.106 0.024 0.003 0.03 0.00
86 1290 21.50 0.2 0.018 0.105 0.016 0.002 0.02 0.00
87 1305 21.75 0.3 0.027 0.104 0.024 0.003 0.03 0.00
88 1320 22.00 0.2 0.018 0.103 0.016 0.002 0.02 0.00
89 1335 22.25 0.3 0.027 0.102 0.024 0.003 0.03 0.00
90 1350 22.50 0.2 0.018 0.101 0.016 0.002 0.02 0.00
91 1365 22.75 0.2 0.018 0.100 0.016 0.002 0.02 0.00
92 1380 23.00 0.2 0.018 0.099 0.016 0.002 0.02 0.00
93 1395 23.25 0.2 0.018 0.099 0.016 0.002 0.02 0.00
94 1410 23.50 0.2 0.018 0.098 0.016 0.002 0.02 0.00
95 1425 23.75 0.2 0.018 0.097 0.016 0.002 0.02 0.00
96 1440 24.00 0.2 0.018 0.097 0.016 0.002 0.02 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.40
FLOOD VOLUME (acft) 0.35
FLOOD VOLUME (cuft) 15459.88
REQUIRED STORAGE (acft) 0.16
REQUIRED STORAGE (cuft) 6850.04
PEAK FLOW (cfs) 1.44
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

INCR TOTAL INCR TOTAL INCR TOTAL
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
465 0 0 15600 0 0 0.00
466 1 1 1520 17120 16360 16360 0.38
467 1 2 1590 18710 17915 34275 0.79
468 1 3 1640 20350 19530 53805 1.24
468.5 0.5 3.5 850 21200 10388 64193 1.47

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.24 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.24 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.17 51 51 73 - 465.00 - 0.00
2 10 0.17 51 51 73 - 465.00 - 0.00
3 15 0.15 44 44 73 - 465.00 - 0.00
4 20 0.20 59 59 73 - 465.00 - 0.00
5 25 0.20 59 59 73 - 465.00 - 0.00
6 30 0.32 97 97 73 24 465.00 24 0.00
7 35 0.20 59 83 73 11 465.00 11 0.00
8 40 0.32 97 107 73 35 465.00 35 0.00
9 45 0.32 97 131 73 59 465.00 59 0.00
10 50 0.20 59 118 73 46 465.00 46 0.00
11 55 0.06 17 63 73 - 465.00 - 0.00
12 60 0.32 97 97 73 24 465.00 24 0.00
13 65 0.85 255 279 73 206 465.01 206 0.00
14 70 0.85 255 461 73 389 465.02 389 0.01
15 75 0.85 255 644 73 571 465.03 571 0.01
16 80 0.59 176 747 73 674 465.04 674 0.02
17 85 1.38 413 1,087 73 1,015 465.06 1,015 0.02
18 90 1.51 453 1,468 73 1,395 465.09 1,395 0.03
19 95 1.11 334 1,729 73 1,657 465.10 1,657 0.04
20 100 1.51 453 2,109 73 2,037 465.12 2,037 0.05
21 105 2.30 690 2,727 73 2,654 465.16 2,654 0.06
22 110 2.04 611 3,265 73 3,193 465.20 3,193 0.07
23 115 1.77 532 3,725 73 3,652 465.22 3,652 0.08
24 120 1.91 572 4,224 73 4,151 465.25 4,151 0.10
25 125 2.04 611 4,762 73 4,690 465.29 4,690 0.11
26 130 3.49 1,046 5,736 73 5,663 465.35 5,663 0.13
27 135 4.54 1,363 7,026 73 6,954 465.43 6,954 0.16
28 140 2.56 769 7,723 73 7,651 465.47 7,651 0.18
29 145 6.92 2,075 9,726 73 9,653 465.59 9,653 0.22
30 150 7.58 2,273 11,927 73 11,854 465.72 11,854 0.27
31 155 8.76 2,629 14,483 73 14,411 465.88 14,411 0.33
32 160 5.73 1,719 16,130 73 16,057 465.98 16,057 0.37
33 165 0.59 176 16,233 73 16,161 465.99 16,161 0.37
34 170 0.32 97 16,257 73 16,185 465.99 16,185 0.37
35 175 0.32 97 16,281 73 16,209 465.99 16,209 0.37
36 180 0.08 24 16,232 73 16,160 465.99 16,160 0.37

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.09 26 26 73 - 465.00 - 0.00
2 10 0.10 31 31 73 - 465.00 - 0.00
3 15 0.10 31 31 73 - 465.00 - 0.00
4 20 0.10 31 31 73 - 465.00 - 0.00
5 25 0.10 31 31 73 - 465.00 - 0.00
6 30 0.12 36 36 73 - 465.00 - 0.00
7 35 0.12 36 36 73 - 465.00 - 0.00
8 40 0.12 36 36 73 - 465.00 - 0.00
9 45 0.12 36 36 73 - 465.00 - 0.00
10 50 0.12 36 36 73 - 465.00 - 0.00
11 55 0.12 36 36 73 - 465.00 - 0.00
12 60 0.14 41 41 73 - 465.00 - 0.00
13 65 0.14 41 41 73 - 465.00 - 0.00
14 70 0.14 41 41 73 - 465.00 - 0.00
15 75 0.14 41 41 73 - 465.00 - 0.00
16 80 0.14 41 41 73 - 465.00 - 0.00
17 85 0.14 41 41 73 - 465.00 - 0.00
18 90 0.14 41 41 73 - 465.00 - 0.00
19 95 0.14 41 41 73 - 465.00 - 0.00
20 100 0.14 41 41 73 - 465.00 - 0.00
21 105 0.14 41 41 73 - 465.00 - 0.00
22 110 0.14 41 41 73 - 465.00 - 0.00
23 115 0.14 41 41 73 - 465.00 - 0.00
24 120 0.16 47 47 73 - 465.00 - 0.00
25 125 0.14 41 41 73 - 465.00 - 0.00
26 130 0.16 47 47 73 - 465.00 - 0.00
27 135 0.16 47 47 73 - 465.00 - 0.00
28 140 0.16 47 47 73 - 465.00 - 0.00
29 145 0.16 47 47 73 - 465.00 - 0.00
30 150 0.16 47 47 73 - 465.00 - 0.00
31 155 0.16 47 47 73 - 465.00 - 0.00
32 160 0.16 47 47 73 - 465.00 - 0.00
33 165 0.17 52 52 73 - 465.00 - 0.00
34 170 0.17 52 52 73 - 465.00 - 0.00
35 175 0.17 52 52 73 - 465.00 - 0.00
36 180 0.17 52 52 73 - 465.00 - 0.00
37 185 0.17 52 52 73 - 465.00 - 0.00
38 190 0.19 57 57 73 - 465.00 - 0.00
39 195 0.19 57 57 73 - 465.00 - 0.00
40 200 0.19 57 57 73 - 465.00 - 0.00
41 205 0.02 5 5 73 - 465.00 - 0.00
42 210 0.19 57 57 73 - 465.00 - 0.00
43 215 0.36 109 109 73 36 465.00 36 0.00
44 220 0.36 109 145 73 72 465.00 72 0.00
45 225 0.54 161 233 73 160 465.01 160 0.00
46 230 0.54 161 321 73 248 465.02 248 0.01
47 235 0.71 212 461 73 388 465.02 388 0.01
48 240 0.71 212 600 73 528 465.03 528 0.01
49 245 0.88 264 792 73 719 465.04 719 0.02
50 250 1.05 316 1,035 73 962 465.06 962 0.02
51 255 1.23 368 1,330 73 1,257 465.08 1,257 0.03
52 260 1.40 419 1,677 73 1,604 465.10 1,604 0.04
53 265 1.57 471 2,075 73 2,003 465.12 2,003 0.05
54 270 1.57 471 2,474 73 2,401 465.15 2,401 0.06
55 275 1.74 523 2,924 73 2,851 465.17 2,851 0.07

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 1.92 575 3,426 73 3,353 465.20 3,353 0.08
57 285 2.09 626 3,980 73 3,907 465.24 3,907 0.09
58 290 2.09 626 4,533 73 4,461 465.27 4,461 0.10
59 295 2.26 678 5,139 73 5,066 465.31 5,066 0.12
60 300 2.43 730 5,796 73 5,723 465.35 5,723 0.13
61 305 3.30 989 6,712 73 6,639 465.41 6,639 0.15
62 310 4.16 1,247 7,887 73 7,814 465.48 7,814 0.18
63 315 4.68 1,403 9,217 73 9,144 465.56 9,144 0.21
64 320 5.19 1,558 10,702 73 10,629 465.65 10,629 0.24
65 325 6.06 1,817 12,446 73 12,373 465.76 12,373 0.28
66 330 7.61 2,282 14,656 73 14,583 465.89 14,583 0.33
67 335 1.23 368 14,951 73 14,878 465.91 14,878 0.34
68 340 0.16 47 14,925 73 14,852 465.91 14,852 0.34
69 345 0.10 31 14,883 73 14,810 465.91 14,810 0.34
70 350 0.09 26 14,836 73 14,764 465.90 14,764 0.34
71 355 0.05 16 14,779 73 14,707 465.90 14,707 0.34
72 360 0.03 10 14,717 73 14,644 465.90 14,644 0.34
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.02 17 17 218 - 465.00 - 0.00
2 30 0.03 25 25 218 - 465.00 - 0.00
3 45 0.03 25 25 218 - 465.00 - 0.00
4 60 0.04 34 34 218 - 465.00 - 0.00
5 75 0.03 25 25 218 - 465.00 - 0.00
6 90 0.03 25 25 218 - 465.00 - 0.00
7 105 0.03 25 25 218 - 465.00 - 0.00
8 120 0.04 34 34 218 - 465.00 - 0.00
9 135 0.04 34 34 218 - 465.00 - 0.00
10 150 0.04 34 34 218 - 465.00 - 0.00
11 165 0.05 42 42 218 - 465.00 - 0.00
12 180 0.05 42 42 218 - 465.00 - 0.00
13 195 0.05 42 42 218 - 465.00 - 0.00
14 210 0.05 42 42 218 - 465.00 - 0.00
15 225 0.05 42 42 218 - 465.00 - 0.00
16 240 0.06 51 51 218 - 465.00 - 0.00
17 255 0.06 51 51 218 - 465.00 - 0.00
18 270 0.07 59 59 218 - 465.00 - 0.00
19 285 0.07 59 59 218 - 465.00 - 0.00
20 300 0.08 68 68 218 - 465.00 - 0.00
21 315 0.06 51 51 218 - 465.00 - 0.00
22 330 0.07 59 59 218 - 465.00 - 0.00
23 345 0.08 68 68 218 - 465.00 - 0.00
24 360 0.08 68 68 218 - 465.00 - 0.00
25 375 0.08 76 76 218 - 465.00 - 0.00
26 390 0.08 76 76 218 - 465.00 - 0.00
27 405 0.09 85 85 218 - 465.00 - 0.00
28 420 0.09 85 85 218 - 465.00 - 0.00
29 435 0.09 85 85 218 - 465.00 - 0.00
30 450 0.10 93 93 218 - 465.00 - 0.00
31 465 0.11 102 102 218 - 465.00 - 0.00
32 480 0.12 110 110 218 - 465.00 - 0.00
33 495 0.14 127 127 218 - 465.00 - 0.00
34 510 0.14 127 127 218 - 465.00 - 0.00
35 525 0.15 136 136 218 - 465.00 - 0.00
36 540 0.16 144 144 218 - 465.00 - 0.00
37 555 0.18 161 161 218 - 465.00 - 0.00
38 570 0.19 170 170 218 - 465.00 - 0.00
39 585 0.20 178 178 218 - 465.00 - 0.00
40 600 0.21 187 187 218 - 465.00 - 0.00
41 615 0.14 127 127 218 - 465.00 - 0.00
42 630 0.14 127 127 218 - 465.00 - 0.00
43 645 0.19 170 170 218 - 465.00 - 0.00
44 660 0.19 170 170 218 - 465.00 - 0.00
45 675 0.18 161 161 218 - 465.00 - 0.00
46 690 0.18 161 161 218 - 465.00 - 0.00
47 705 0.16 144 144 218 - 465.00 - 0.00
48 720 0.17 153 153 218 - 465.00 - 0.00
49 735 0.45 406 406 218 188 465.01 188 0.00
50 750 0.57 516 704 218 487 465.03 487 0.01
51 765 0.79 711 1,198 218 980 465.06 980 0.02
52 780 0.91 821 1,802 218 1,584 465.10 1,584 0.04
53 795 1.41 1,270 2,854 218 2,637 465.16 2,637 0.06
54 810 1.44 1,295 3,931 218 3,714 465.23 3,714 0.09
55 825 0.43 386 4,099 218 3,882 465.24 3,882 0.09
56 840 0.45 409 4,291 218 4,073 465.25 4,073 0.09
57 855 0.86 772 4,846 218 4,628 465.28 4,628 0.11
58 870 0.79 711 5,339 218 5,121 465.31 5,121 0.12

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.82 734 5,855 218 5,637 465.34 5,637 0.13
60 900 0.75 671 6,308 218 6,090 465.37 6,090 0.14
61 915 0.68 609 6,699 218 6,481 465.40 6,481 0.15
62 930 0.61 546 7,027 218 6,809 465.42 6,809 0.16
63 945 0.25 228 7,037 218 6,819 465.42 6,819 0.16
64 960 0.28 249 7,068 218 6,850 465.42 6,850 0.16
65 975 0.04 34 6,884 218 6,666 465.41 6,666 0.15
66 990 0.04 34 6,700 218 6,482 465.40 6,482 0.15
67 1005 0.03 25 6,508 218 6,290 465.38 6,290 0.14
68 1020 0.03 25 6,316 218 6,098 465.37 6,098 0.14
69 1035 0.05 42 6,140 218 5,923 465.36 5,923 0.14
70 1050 0.05 42 5,965 218 5,747 465.35 5,747 0.13
71 1065 0.05 42 5,790 218 5,572 465.34 5,572 0.13
72 1080 0.04 34 5,606 218 5,388 465.33 5,388 0.12
73 1095 0.04 34 5,422 218 5,204 465.32 5,204 0.12
74 1110 0.04 34 5,238 218 5,020 465.31 5,020 0.12
75 1125 0.03 25 5,046 218 4,828 465.30 4,828 0.11
76 1140 0.02 4,845 17 218 4,627 465.28 4,627 0.11
77 1155 0.03 25 4,653 218 4,435 465.27 4,435 0.10
78 1170 0.04 34 4,469 218 4,251 465.26 4,251 0.10
79 1185 0.03 25 4,277 218 4,059 465.25 4,059 0.09
80 1200 0.02 17 4,076 218 3,858 465.24 3,858 0.09
81 1215 0.03 25 3,884 218 3,666 465.22 3,666 0.08
82 1230 0.03 25 3,691 218 3,474 465.21 3,474 0.08
83 1245 0.03 25 3,499 218 3,281 465.20 3,281 0.08
84 1260 0.02 17 3,298 218 3,081 465.19 3,081 0.07
85 1275 0.03 25 3,106 218 2,888 465.18 2,888 0.07
86 1290 0.02 17 2,905 218 2,687 465.16 2,687 0.06
87 1305 0.03 25 2,713 218 2,495 465.15 2,495 0.06
88 1320 0.02 17 2,512 218 2,294 465.14 2,294 0.05
89 1335 0.03 25 2,320 218 2,102 465.13 2,102 0.05
90 1350 0.02 17 2,119 218 1,901 465.12 1,901 0.04
91 1365 0.02 17 1,918 218 1,701 465.10 1,701 0.04
92 1380 0.02 17 1,718 218 1,500 465.09 1,500 0.03
93 1395 0.02 17 1,517 218 1,299 465.08 1,299 0.03
94 1410 0.02 17 1,316 218 1,098 465.07 1,098 0.03
95 1425 0.02 17 1,115 218 897 465.05 897 0.02
96 1440 0.02 17 914 218 697 465.04 697 0.02
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 3

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.56
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 6.65

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 1.04

RETENTION BASIN

GOLF COURSE

MOUNTAINOUS
LOW LOSS RATE (PERCENT) 90%
LENGTH OF WATERCOURSE (L) 750
LENGTH TO POINT OPPOSITE CENTROID (Lca) 170
ELEVATION OF HEADWATER 471.8
ELEVATION OF CONCENTRATION POINT 468.5
AVERAGE MANNINGS 'N' VALUE 0.02
STORM FREQUENCY (YEAR) 100

POINT RAIN
3-HOUR 1.04
6-HOUR 1.36
24-HOUR 2.23
BASIN CHARACTERISTICS: ELEVATION AREA
465 15000
466 16600
467 18250
468 19960
468.5 20831
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 966 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

1.04 10.250 1.00 1.04 1.36 10.250 1.00 1.36 2.23 10.250 1.00 2.23

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 10.25 SUM [7] 1.04 SUM [9] 10.25 SUM [11] 1.36 SUM [13] 10.25 SUM [15] 2.23 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 1.04 1.36 2.23
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 0.47 0.46 0.36
FLOOD VOLUME (cu-ft) 17,326 17,301 13,560
(acre-ft) 0.40 0.40 0.31
REQUIRED STORAGE (cu-ft) 14,912 13,552 5,367
(acre-ft) 0.34 0.31 0.12
PEAK FLOW (cfs) 8.38 7.26 1.29
MAXIMUM WSEL (ft) 465.94 465.86 465.34

0.142
170.00

0.001
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 3.3
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 3

10.250
750

0.032
471.8
468.5

0.03 2.0

2.0 4.1

23.2 4.82

0.23 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 10 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

RATE IMPERVIOUS RATE
(in/hr) (in/hr) (in/hr)
[Plate C-1] [Plate E-6.1] [Plate E-6.2] [Plate E-6.3]
B 56 0.52 90% 0.10 0.00 0.000 0.0000
B 56 0.52 100% 0.05 2.56 0.250 0.0130
B 56 0.52 20% 0.43 0.00 0.000 0.0000B 56 0.52 40% 0.33 0.00 0.000 0.0000B 56 0.52 50% 0.29 0.00 0.000 0.0000B 56 0.52 65% 0.22 6.65 0.649 0.1400B 56 0.52 80% 0.15 0.00 0.000 0.0000B 56 0.52 75% 0.17 0.00 0.000 0.0000B 56 0.52 0% 0.52 1.04 0.101 0.0528B 56 0.52 0% 0.52 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.00 0.000 0.0000 D 93 0.95 90% 0.18 0.00 0.000 0.0000

0.00 0.000 0.0000

0.00 0.000 0.0000
SUM 10.25 SUM 0.2058
VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY)Fm= 0.102877561C= 0.00191Ft=C(24-(T/60))^1.55 = 0.00191 0.10 in/hr LOW LOSS RATE (80-90 PERCENT) = 90%Where:T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,T=1 1/2 unit time for the second period, etc. (24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 10.25
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.05
UNIT TIME-PERCENT OF LAG 244.5
TOTAL ADJUSTED STORM RAIN-INCHES 1.04
CONSTANT LOSS RATE-in/hr 0.21
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.23 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.162 0.21 0.15 0.02 0.17 0.00
2 10 0.17 1.3 0.162 0.21 0.15 0.02 0.17 0.00
3 15 0.25 1.1 0.137 0.21 0.12 0.01 0.14 0.00
4 20 0.33 1.5 0.187 0.21 0.17 0.02 0.19 0.00
5 25 0.42 1.5 0.187 0.21 0.17 0.02 0.19 0.00
6 30 0.50 1.8 0.225 0.21 0.20 0.02 0.19 0.00
7 35 0.58 1.5 0.187 0.21 0.17 0.02 0.19 0.00
8 40 0.67 1.8 0.225 0.21 0.20 0.02 0.19 0.00
9 45 0.75 1.8 0.225 0.21 0.20 0.02 0.19 0.00
10 50 0.83 1.5 0.187 0.21 0.17 0.02 0.19 0.00
11 55 0.92 1.6 0.200 0.21 0.18 0.02 0.20 0.00
12 60 1.00 1.8 0.225 0.21 0.20 0.02 0.19 0.00
13 65 1.08 2.2 0.275 0.21 0.25 0.07 0.71 141.78
14 70 1.17 2.2 0.275 0.21 0.25 0.07 0.71 141.78
15 75 1.25 2.2 0.275 0.21 0.25 0.07 0.71 141.78
16 80 1.33 2.0 0.250 0.21 0.22 0.04 0.45 65.03
17 85 1.42 2.6 0.324 0.21 0.29 0.12 1.22 295.29
18 90 1.50 2.7 0.337 0.21 0.30 0.13 1.34 333.66
19 95 1.58 2.4 0.300 0.21 0.27 0.09 0.96 218.54
20 100 1.67 2.7 0.337 0.21 0.30 0.13 1.34 333.66
21 105 1.75 3.3 0.412 0.21 0.37 0.21 2.11 563.92
22 110 1.83 3.1 0.387 0.21 0.35 0.18 1.86 487.17
23 115 1.92 2.9 0.362 0.21 0.33 0.16 1.60 410.42
24 120 2.00 3.0 0.374 0.21 0.34 0.17 1.73 448.79
25 125 2.08 3.1 0.387 0.21 0.35 0.18 1.86 487.17
26 130 2.17 4.2 0.524 0.21 0.47 0.32 3.26 909.30
27 135 2.25 5.0 0.624 0.21 0.56 0.42 4.29 1216.31
28 140 2.33 3.5 0.437 0.21 0.39 0.23 2.37 640.67
29 145 2.42 6.8 0.849 0.21 0.76 0.64 6.59 1907.08
30 150 2.50 7.3 0.911 0.21 0.82 0.71 7.23 2098.96
31 155 2.58 8.2 1.023 0.21 0.92 0.82 8.38 2444.34
32 160 2.67 5.9 0.736 0.21 0.66 0.53 5.44 1561.70
33 165 2.75 2.0 0.250 0.21 0.22 0.04 0.45 65.03
34 170 2.83 1.8 0.225 0.21 0.20 0.02 0.19 0.00
35 175 2.92 1.8 0.225 0.21 0.20 0.02 0.19 0.00
36 180 3.00 0.6 0.075 0.21 0.07 0.01 0.08 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.47
FLOOD VOLUME (acft) 0.40
FLOOD VOLUME (cuft) 17326.37
REQUIRED STORAGE (acft) 0.34
REQUIRED STORAGE (cuft) 14912.39
PEAK FLOW RATE (cfs) 8.38
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.25
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.05
UNIT TIME-PERCENT OF LAG 244.5
TOTAL ADJUSTED STORM RAIN-INCHES 1.36
CONSTANT LOSS RATE-in/hr 0.206
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.23 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.082 0.21 0.07 0.01 0.08 0.00
2 10 0.17 0.6 0.098 0.21 0.09 0.01 0.10 0.00
3 15 0.25 0.6 0.098 0.21 0.09 0.01 0.10 0.00
4 20 0.33 0.6 0.098 0.21 0.09 0.01 0.10 0.00
5 25 0.42 0.6 0.098 0.21 0.09 0.01 0.10 0.00
6 30 0.50 0.7 0.114 0.21 0.10 0.01 0.12 0.00
7 35 0.58 0.7 0.114 0.21 0.10 0.01 0.12 0.00
8 40 0.67 0.7 0.114 0.21 0.10 0.01 0.12 0.00
9 45 0.75 0.7 0.114 0.21 0.10 0.01 0.12 0.00
10 50 0.83 0.7 0.114 0.21 0.10 0.01 0.12 0.00
11 55 0.92 0.7 0.114 0.21 0.10 0.01 0.12 0.00
12 60 1.00 0.8 0.131 0.21 0.12 0.01 0.13 0.00
13 65 1.08 0.8 0.131 0.21 0.12 0.01 0.13 0.00
14 70 1.17 0.8 0.131 0.21 0.12 0.01 0.13 0.00
15 75 1.25 0.8 0.131 0.21 0.12 0.01 0.13 0.00
16 80 1.33 0.8 0.131 0.21 0.12 0.01 0.13 0.00
17 85 1.42 0.8 0.131 0.21 0.12 0.01 0.13 0.00
18 90 1.50 0.8 0.131 0.21 0.12 0.01 0.13 0.00
19 95 1.58 0.8 0.131 0.21 0.12 0.01 0.13 0.00
20 100 1.67 0.8 0.131 0.21 0.12 0.01 0.13 0.00
21 105 1.75 0.8 0.131 0.21 0.12 0.01 0.13 0.00
22 110 1.83 0.8 0.131 0.21 0.12 0.01 0.13 0.00
23 115 1.92 0.8 0.131 0.21 0.12 0.01 0.13 0.00
24 120 2.00 0.9 0.147 0.21 0.13 0.01 0.15 0.00
25 125 2.08 0.8 0.131 0.21 0.12 0.01 0.13 0.00
26 130 2.17 0.9 0.147 0.21 0.13 0.01 0.15 0.00
27 135 2.25 0.9 0.147 0.21 0.13 0.01 0.15 0.00
28 140 2.33 0.9 0.147 0.21 0.13 0.01 0.15 0.00
29 145 2.42 0.9 0.147 0.21 0.13 0.01 0.15 0.00
30 150 2.50 0.9 0.147 0.21 0.13 0.01 0.15 0.00
31 155 2.58 0.9 0.147 0.21 0.13 0.01 0.15 0.00
32 160 2.67 0.9 0.147 0.21 0.13 0.01 0.15 0.00
33 165 2.75 1.0 0.163 0.21 0.15 0.02 0.17 0.00
34 170 2.83 1.0 0.163 0.21 0.15 0.02 0.17 0.00
35 175 2.92 1.0 0.163 0.21 0.15 0.02 0.17 0.00
36 180 3.00 1.0 0.163 0.21 0.15 0.02 0.17 0.00
37 185 3.08 1.0 0.163 0.21 0.15 0.02 0.17 0.00
38 190 3.17 1.1 0.180 0.21 0.16 0.02 0.18 0.00
39 195 3.25 1.1 0.180 0.21 0.16 0.02 0.18 0.00
40 200 3.33 1.1 0.180 0.21 0.16 0.02 0.18 0.00
41 205 3.42 1.2 0.196 0.21 0.18 0.02 0.20 0.00
42 210 3.50 1.3 0.212 0.21 0.19 0.01 0.07 0.00
43 215 3.58 1.4 0.228 0.21 0.21 0.02 0.23 0.09
44 220 3.67 1.4 0.228 0.21 0.21 0.02 0.23 0.09
45 225 3.75 1.5 0.245 0.21 0.22 0.04 0.40 50.27
46 230 3.83 1.5 0.245 0.21 0.22 0.04 0.40 50.27
47 235 3.92 1.6 0.261 0.21 0.24 0.06 0.57 100.46
48 240 4.00 1.6 0.261 0.21 0.24 0.06 0.57 100.46
49 245 4.08 1.7 0.277 0.21 0.25 0.07 0.73 150.64
50 250 4.17 1.8 0.294 0.21 0.26 0.09 0.90 200.82
51 255 4.25 1.9 0.310 0.21 0.28 0.10 1.07 251.01
52 260 4.33 2.0 0.326 0.21 0.29 0.12 1.24 301.19
53 265 4.42 2.1 0.343 0.21 0.31 0.14 1.40 351.38
54 270 4.50 2.1 0.343 0.21 0.31 0.14 1.40 351.38
55 275 4.58 2.2 0.359 0.21 0.32 0.15 1.57 401.56
56 280 4.67 2.3 0.375 0.21 0.34 0.17 1.74 451.74

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.392 0.21 0.35 0.19 1.91 501.93
58 290 4.83 2.4 0.392 0.21 0.35 0.19 1.91 501.93
59 295 4.92 2.5 0.408 0.21 0.37 0.20 2.07 552.11
60 300 5.00 2.6 0.424 0.21 0.38 0.22 2.24 602.30
61 305 5.08 3.1 0.506 0.21 0.46 0.30 3.08 853.22
62 310 5.17 3.6 0.588 0.21 0.53 0.38 3.91 1104.14
63 315 5.25 3.9 0.636 0.21 0.57 0.43 4.41 1254.69
64 320 5.33 4.2 0.685 0.21 0.62 0.48 4.92 1405.24
65 325 5.42 4.7 0.767 0.21 0.69 0.56 5.75 1656.16
66 330 5.50 5.6 0.914 0.21 0.82 0.71 7.26 2107.82
67 335 5.58 1.9 0.310 0.21 0.28 0.10 1.07 251.01
68 340 5.67 0.9 0.147 0.21 0.13 0.01 0.15 0.00
69 345 5.75 0.6 0.098 0.21 0.09 0.01 0.10 0.00
70 350 5.83 0.5 0.082 0.21 0.07 0.01 0.08 0.00
71 355 5.92 0.3 0.049 0.21 0.04 0.00 0.05 0.00
72 360 6.00 0.2 0.033 0.21 0.03 0.00 0.03 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.46
FLOOD VOLUME (acft) 0.40
FLOOD VOLUME (cuft) 17301.15
REQUIRED STORAGE (acft) 0.31
REQUIRED STORAGE (cuft) 13551.86
PEAK FLOW RATE (cfs) 7.26
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.250 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2058 LAG TIME - MINUTES 2.05 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 UNIT TIME-PERCENT OF LAG 733.4 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00191
PERCOLATION RATE (cfs) 0.23
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.018 0.363 0.016 0.002 0.02 0.00
2 30 0.50 0.3 0.027 0.359 0.024 0.003 0.03 0.00
3 45 0.75 0.3 0.027 0.355 0.024 0.003 0.03 0.00
4 60 1.00 0.4 0.036 0.351 0.032 0.004 0.04 0.00
5 75 1.25 0.3 0.027 0.347 0.024 0.003 0.03 0.00
6 90 1.50 0.3 0.027 0.343 0.024 0.003 0.03 0.00
7 105 1.75 0.3 0.027 0.338 0.024 0.003 0.03 0.00
8 120 2.00 0.4 0.036 0.334 0.032 0.004 0.04 0.00
9 135 2.25 0.4 0.036 0.330 0.032 0.004 0.04 0.00
10 150 2.50 0.4 0.036 0.326 0.032 0.004 0.04 0.00
11 165 2.75 0.5 0.045 0.322 0.040 0.004 0.05 0.00
12 180 3.00 0.5 0.045 0.318 0.040 0.004 0.05 0.00
13 195 3.25 0.5 0.045 0.314 0.040 0.004 0.05 0.00
14 210 3.50 0.5 0.045 0.310 0.040 0.004 0.05 0.00
15 225 3.75 0.5 0.045 0.307 0.040 0.004 0.05 0.00
16 240 4.00 0.6 0.054 0.303 0.048 0.005 0.05 0.00
17 255 4.25 0.6 0.054 0.299 0.048 0.005 0.05 0.00
18 270 4.50 0.7 0.062 0.295 0.056 0.006 0.06 0.00
19 285 4.75 0.7 0.062 0.291 0.056 0.006 0.06 0.00
20 300 5.00 0.8 0.071 0.288 0.064 0.007 0.07 0.00
21 315 5.25 0.6 0.054 0.284 0.048 0.005 0.05 0.00
22 330 5.50 0.7 0.062 0.280 0.056 0.006 0.06 0.00
23 345 5.75 0.8 0.071 0.276 0.064 0.007 0.07 0.00
24 360 6.00 0.8 0.071 0.273 0.064 0.007 0.07 0.00
25 375 6.25 0.9 0.080 0.269 0.072 0.008 0.08 0.00
26 390 6.50 0.9 0.080 0.266 0.072 0.008 0.08 0.00
27 405 6.75 1.0 0.089 0.262 0.080 0.009 0.09 0.00
28 420 7.00 1.0 0.089 0.258 0.080 0.009 0.09 0.00
29 435 7.25 1.0 0.089 0.255 0.080 0.009 0.09 0.00
30 450 7.50 1.1 0.098 0.252 0.088 0.010 0.10 0.00
31 465 7.75 1.2 0.107 0.248 0.096 0.011 0.11 0.00
32 480 8.00 1.3 0.116 0.245 0.104 0.012 0.12 0.00
33 495 8.25 1.5 0.134 0.241 0.120 0.013 0.14 0.00
34 510 8.50 1.5 0.134 0.238 0.120 0.013 0.14 0.00
35 525 8.75 1.6 0.143 0.235 0.128 0.014 0.15 0.00
36 540 9.00 1.7 0.152 0.231 0.136 0.015 0.16 0.00
37 555 9.25 1.9 0.169 0.228 0.153 0.017 0.17 0.00
38 570 9.50 2.0 0.178 0.225 0.161 0.018 0.18 0.00
39 585 9.75 2.1 0.187 0.222 0.169 0.019 0.19 0.00
40 600 10.00 2.2 0.196 0.218 0.177 0.020 0.20 0.00
41 615 10.25 1.5 0.134 0.215 0.120 0.013 0.14 0.00
42 630 10.50 1.5 0.134 0.212 0.120 0.013 0.14 0.00
43 645 10.75 2.0 0.178 0.209 0.161 0.018 0.18 0.00
44 660 11.00 2.0 0.178 0.206 0.161 0.018 0.18 0.00
45 675 11.25 1.9 0.169 0.203 0.153 0.017 0.17 0.00
46 690 11.50 1.9 0.169 0.200 0.153 0.017 0.17 0.00
47 705 11.75 1.7 0.152 0.197 0.136 0.015 0.16 0.00
48 720 12.00 1.8 0.161 0.194 0.145 0.016 0.16 0.00
49 735 12.25 2.5 0.223 0.191 0.201 0.032 0.33 84.85
50 750 12.50 2.6 0.232 0.188 0.209 0.044 0.45 193.54
51 765 12.75 2.8 0.250 0.185 0.225 0.064 0.66 384.21
52 780 13.00 2.9 0.259 0.183 0.233 0.076 0.78 492.27
53 795 13.25 3.4 0.303 0.180 0.273 0.123 1.27 929.17
54 810 13.50 3.4 0.303 0.177 0.273 0.126 1.29 954.32
55 825 13.75 2.3 0.205 0.174 0.185 0.031 0.31 73.98
56 840 14.00 2.3 0.205 0.172 0.185 0.033 0.34 98.48
57 855 14.25 2.7 0.241 0.169 0.217 0.072 0.73 451.79
58 870 14.50 2.6 0.232 0.167 0.209 0.065 0.67 393.33
59 885 14.75 2.6 0.232 0.164 0.209 0.068 0.70 416.82
60 900 15.00 2.5 0.223 0.162 0.201 0.061 0.63 357.68
61 915 15.25 2.4 0.214 0.159 0.193 0.055 0.56 298.20
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
62 930 15.50 2.3 0.205 0.157 0.185 0.049 0.50 238.37
63 945 15.75 1.9 0.169 0.154 0.153 0.015 0.16 0.00
64 960 16.00 1.9 0.169 0.152 0.153 0.018 0.18 0.00
65 975 16.25 0.4 0.036 0.150 0.032 0.004 0.04 0.00
66 990 16.50 0.4 0.036 0.147 0.032 0.004 0.04 0.00
67 1005 16.75 0.3 0.027 0.145 0.024 0.003 0.03 0.00
68 1020 17.00 0.3 0.027 0.143 0.024 0.003 0.03 0.00
69 1035 17.25 0.5 0.045 0.141 0.040 0.004 0.05 0.00
70 1050 17.50 0.5 0.045 0.139 0.040 0.004 0.05 0.00
71 1065 17.75 0.5 0.045 0.137 0.040 0.004 0.05 0.00
72 1080 18.00 0.4 0.036 0.134 0.032 0.004 0.04 0.00
73 1095 18.25 0.4 0.036 0.133 0.032 0.004 0.04 0.00
74 1110 18.50 0.4 0.036 0.131 0.032 0.004 0.04 0.00
75 1125 18.75 0.3 0.027 0.129 0.024 0.003 0.03 0.00
76 1140 19.00 0.2 0.018 0.127 0.016 0.002 0.02 0.00
77 1155 19.25 0.3 0.027 0.125 0.024 0.003 0.03 0.00
78 1170 19.50 0.4 0.036 0.123 0.032 0.004 0.04 0.00
79 1185 19.75 0.3 0.027 0.122 0.024 0.003 0.03 0.00
80 1200 20.00 0.2 0.018 0.120 0.016 0.002 0.02 0.00
81 1215 20.25 0.3 0.027 0.118 0.024 0.003 0.03 0.00
82 1230 20.50 0.3 0.027 0.117 0.024 0.003 0.03 0.00
83 1245 20.75 0.3 0.027 0.115 0.024 0.003 0.03 0.00
84 1260 21.00 0.2 0.018 0.114 0.016 0.002 0.02 0.00
85 1275 21.25 0.3 0.027 0.113 0.024 0.003 0.03 0.00
86 1290 21.50 0.2 0.018 0.111 0.016 0.002 0.02 0.00
87 1305 21.75 0.3 0.027 0.110 0.024 0.003 0.03 0.00
88 1320 22.00 0.2 0.018 0.109 0.016 0.002 0.02 0.00
89 1335 22.25 0.3 0.027 0.108 0.024 0.003 0.03 0.00
90 1350 22.50 0.2 0.018 0.107 0.016 0.002 0.02 0.00
91 1365 22.75 0.2 0.018 0.106 0.016 0.002 0.02 0.00
92 1380 23.00 0.2 0.018 0.105 0.016 0.002 0.02 0.00
93 1395 23.25 0.2 0.018 0.104 0.016 0.002 0.02 0.00
94 1410 23.50 0.2 0.018 0.104 0.016 0.002 0.02 0.00
95 1425 23.75 0.2 0.018 0.103 0.016 0.002 0.02 0.00
96 1440 24.00 0.2 0.018 0.103 0.016 0.002 0.02 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.36
FLOOD VOLUME (acft) 0.31
FLOOD VOLUME (cuft) 13560.19
REQUIRED STORAGE (acft) 0.12
REQUIRED STORAGE (cuft) 5367.00
PEAK FLOW (cfs) 1.29
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

INCR TOTAL INCR TOTAL INCR TOTAL
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
465 0 0 15000 0 0 0.00
466 1 1 1600 16600 15800 15800 0.36
467 1 2 1650 18250 17425 33225 0.76
468 1 3 1710 19960 19105 52330 1.20
468.5 0.5 3.5 871 20831 10198 62528 1.44

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.23 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.23 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.17 50 50 70 - 465.00 - 0.00
2 10 0.17 50 50 70 - 465.00 - 0.00
3 15 0.14 42 42 70 - 465.00 - 0.00
4 20 0.19 58 58 70 - 465.00 - 0.00
5 25 0.19 58 58 70 - 465.00 - 0.00
6 30 0.19 58 58 70 - 465.00 - 0.00
7 35 0.19 58 58 70 - 465.00 - 0.00
8 40 0.19 58 58 70 - 465.00 - 0.00
9 45 0.19 58 58 70 - 465.00 - 0.00
10 50 0.19 58 58 70 - 465.00 - 0.00
11 55 0.20 61 61 70 - 465.00 - 0.00
12 60 0.19 58 58 70 - 465.00 - 0.00
13 65 0.71 212 212 70 142 465.01 142 0.00
14 70 0.71 212 353 70 284 465.02 284 0.01
15 75 0.71 212 495 70 425 465.03 425 0.01
16 80 0.45 135 560 70 490 465.03 490 0.01
17 85 1.22 365 855 70 786 465.05 786 0.02
18 90 1.34 403 1,189 70 1,119 465.07 1,119 0.03
19 95 0.96 288 1,408 70 1,338 465.08 1,338 0.03
20 100 1.34 403 1,741 70 1,672 465.11 1,672 0.04
21 105 2.11 634 2,305 70 2,235 465.14 2,235 0.05
22 110 1.86 557 2,792 70 2,723 465.17 2,723 0.06
23 115 1.60 480 3,203 70 3,133 465.20 3,133 0.07
24 120 1.73 519 3,652 70 3,582 465.23 3,582 0.08
25 125 1.86 557 4,139 70 4,069 465.26 4,069 0.09
26 130 3.26 979 5,048 70 4,978 465.32 4,978 0.11
27 135 4.29 1,286 6,264 70 6,195 465.39 6,195 0.14
28 140 2.37 710 6,905 70 6,835 465.43 6,835 0.16
29 145 6.59 1,977 8,812 70 8,742 465.55 8,742 0.20
30 150 7.23 2,169 10,911 70 10,841 465.69 10,841 0.25
31 155 8.38 2,514 13,355 70 13,286 465.84 13,286 0.30
32 160 5.44 1,631 14,917 70 14,847 465.94 14,847 0.34
33 165 0.45 135 14,982 70 14,912 465.94 14,912 0.34
34 170 0.19 58 14,970 70 14,901 465.94 14,901 0.34
35 175 0.19 58 14,959 70 14,889 465.94 14,889 0.34
36 180 0.08 23 14,912 70 14,842 465.94 14,842 0.34

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.08 25 25 70 - 465.00 - 0.00
2 10 0.10 30 30 70 - 465.00 - 0.00
3 15 0.10 30 30 70 - 465.00 - 0.00
4 20 0.10 30 30 70 - 465.00 - 0.00
5 25 0.10 30 30 70 - 465.00 - 0.00
6 30 0.12 35 35 70 - 465.00 - 0.00
7 35 0.12 35 35 70 - 465.00 - 0.00
8 40 0.12 35 35 70 - 465.00 - 0.00
9 45 0.12 35 35 70 - 465.00 - 0.00
10 50 0.12 35 35 70 - 465.00 - 0.00
11 55 0.12 35 35 70 - 465.00 - 0.00
12 60 0.13 40 40 70 - 465.00 - 0.00
13 65 0.13 40 40 70 - 465.00 - 0.00
14 70 0.13 40 40 70 - 465.00 - 0.00
15 75 0.13 40 40 70 - 465.00 - 0.00
16 80 0.13 40 40 70 - 465.00 - 0.00
17 85 0.13 40 40 70 - 465.00 - 0.00
18 90 0.13 40 40 70 - 465.00 - 0.00
19 95 0.13 40 40 70 - 465.00 - 0.00
20 100 0.13 40 40 70 - 465.00 - 0.00
21 105 0.13 40 40 70 - 465.00 - 0.00
22 110 0.13 40 40 70 - 465.00 - 0.00
23 115 0.13 40 40 70 - 465.00 - 0.00
24 120 0.15 45 45 70 - 465.00 - 0.00
25 125 0.13 40 40 70 - 465.00 - 0.00
26 130 0.15 45 45 70 - 465.00 - 0.00
27 135 0.15 45 45 70 - 465.00 - 0.00
28 140 0.15 45 45 70 - 465.00 - 0.00
29 145 0.15 45 45 70 - 465.00 - 0.00
30 150 0.15 45 45 70 - 465.00 - 0.00
31 155 0.15 45 45 70 - 465.00 - 0.00
32 160 0.15 45 45 70 - 465.00 - 0.00
33 165 0.17 50 50 70 - 465.00 - 0.00
34 170 0.17 50 50 70 - 465.00 - 0.00
35 175 0.17 50 50 70 - 465.00 - 0.00
36 180 0.17 50 50 70 - 465.00 - 0.00
37 185 0.17 50 50 70 - 465.00 - 0.00
38 190 0.18 55 55 70 - 465.00 - 0.00
39 195 0.18 55 55 70 - 465.00 - 0.00
40 200 0.18 55 55 70 - 465.00 - 0.00
41 205 0.20 60 60 70 - 465.00 - 0.00
42 210 0.07 20 20 70 - 465.00 - 0.00
43 215 0.23 70 70 70 0 465.00 0.00 0
44 220 0.23 70 70 70 0 465.00 0.00 0
45 225 0.40 120 120 70 50 465.00 50 0.00
46 230 0.40 120 171 70 101 465.01 101 0.00
47 235 0.57 170 271 70 201 465.01 201 0.00
48 240 0.57 170 371 70 302 465.02 302 0.01
49 245 0.73 220 522 70 452 465.03 452 0.01
50 250 0.90 271 723 70 653 465.04 653 0.01
51 255 1.07 321 974 70 904 465.06 904 0.02
52 260 1.24 371 1,275 70 1,205 465.08 1,205 0.03
53 265 1.40 421 1,626 70 1,557 465.10 1,557 0.04
54 270 1.40 421 1,978 70 1,908 465.12 1,908 0.04
55 275 1.57 471 2,379 70 2,310 465.15 2,310 0.05

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 1.74 522 2,831 70 2,761 465.17 2,761 0.06
57 285 1.91 572 3,333 70 3,263 465.21 3,263 0.07
58 290 1.91 572 3,835 70 3,765 465.24 3,765 0.09
59 295 2.07 622 4,387 70 4,317 465.27 4,317 0.10
60 300 2.24 672 4,989 70 4,920 465.31 4,920 0.11
61 305 3.08 923 5,843 70 5,773 465.37 5,773 0.13
62 310 3.91 1,174 6,947 70 6,877 465.44 6,877 0.16
63 315 4.41 1,324 8,201 70 8,132 465.51 8,132 0.19
64 320 4.92 1,475 9,607 70 9,537 465.60 9,537 0.22
65 325 5.75 1,726 11,263 70 11,193 465.71 11,193 0.26
66 330 7.26 2,178 13,371 70 13,301 465.84 13,301 0.31
67 335 1.07 321 13,622 70 13,552 465.86 13,552 0.31
68 340 0.15 45 13,597 70 13,527 465.86 13,527 0.31
69 345 0.10 30 13,557 70 13,488 465.85 13,488 0.31
70 350 0.08 25 13,513 70 13,443 465.85 13,443 0.31
71 355 0.05 15 13,458 70 13,388 465.85 13,388 0.31
72 360 0.03 10 13,398 70 13,328 465.84 13,328 0.31
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.02 16 16 209 - 465.00 - 0.00
2 30 0.03 25 25 209 - 465.00 - 0.00
3 45 0.03 25 25 209 - 465.00 - 0.00
4 60 0.04 33 33 209 - 465.00 - 0.00
5 75 0.03 25 25 209 - 465.00 - 0.00
6 90 0.03 25 25 209 - 465.00 - 0.00
7 105 0.03 25 25 209 - 465.00 - 0.00
8 120 0.04 33 33 209 - 465.00 - 0.00
9 135 0.04 33 33 209 - 465.00 - 0.00
10 150 0.04 33 33 209 - 465.00 - 0.00
11 165 0.05 41 41 209 - 465.00 - 0.00
12 180 0.05 41 41 209 - 465.00 - 0.00
13 195 0.05 41 41 209 - 465.00 - 0.00
14 210 0.05 41 41 209 - 465.00 - 0.00
15 225 0.05 41 41 209 - 465.00 - 0.00
16 240 0.05 49 49 209 - 465.00 - 0.00
17 255 0.05 49 49 209 - 465.00 - 0.00
18 270 0.06 58 58 209 - 465.00 - 0.00
19 285 0.06 58 58 209 - 465.00 - 0.00
20 300 0.07 66 66 209 - 465.00 - 0.00
21 315 0.05 49 49 209 - 465.00 - 0.00
22 330 0.06 58 58 209 - 465.00 - 0.00
23 345 0.07 66 66 209 - 465.00 - 0.00
24 360 0.07 66 66 209 - 465.00 - 0.00
25 375 0.08 74 74 209 - 465.00 - 0.00
26 390 0.08 74 74 209 - 465.00 - 0.00
27 405 0.09 82 82 209 - 465.00 - 0.00
28 420 0.09 82 82 209 - 465.00 - 0.00
29 435 0.09 82 82 209 - 465.00 - 0.00
30 450 0.10 91 91 209 - 465.00 - 0.00
31 465 0.11 99 99 209 - 465.00 - 0.00
32 480 0.12 107 107 209 - 465.00 - 0.00
33 495 0.14 123 123 209 - 465.00 - 0.00
34 510 0.14 123 123 209 - 465.00 - 0.00
35 525 0.15 132 132 209 - 465.00 - 0.00
36 540 0.16 140 140 209 - 465.00 - 0.00
37 555 0.17 156 156 209 - 465.00 - 0.00
38 570 0.18 165 165 209 - 465.00 - 0.00
39 585 0.19 173 173 209 - 465.00 - 0.00
40 600 0.20 181 181 209 - 465.00 - 0.00
41 615 0.14 123 123 209 - 465.00 - 0.00
42 630 0.14 123 123 209 - 465.00 - 0.00
43 645 0.18 165 165 209 - 465.00 - 0.00
44 660 0.18 165 165 209 - 465.00 - 0.00
45 675 0.17 156 156 209 - 465.00 - 0.00
46 690 0.17 156 156 209 - 465.00 - 0.00
47 705 0.16 140 140 209 - 465.00 - 0.00
48 720 0.16 148 148 209 - 465.00 - 0.00
49 735 0.33 294 294 209 85 465.01 85 0.00
50 750 0.45 403 488 209 278 465.02 278 0.01
51 765 0.66 594 872 209 663 465.04 663 0.02
52 780 0.78 702 1,364 209 1,155 465.07 1,155 0.03
53 795 1.27 1,139 2,293 209 2,084 465.13 2,084 0.05
54 810 1.29 1,164 3,248 209 3,038 465.19 3,038 0.07
55 825 0.31 283 3,322 209 3,112 465.20 3,112 0.07
56 840 0.34 308 3,420 209 3,211 465.20 3,211 0.07
57 855 0.73 661 3,872 209 3,663 465.23 3,663 0.08
58 870 0.67 603 4,265 209 4,056 465.26 4,056 0.09

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.70 626 4,682 209 4,473 465.28 4,473 0.10
60 900 0.63 567 5,040 209 4,830 465.31 4,830 0.11
61 915 0.56 508 5,338 209 5,129 465.32 5,129 0.12
62 930 0.50 448 5,576 209 5,367 465.34 5,367 0.12
63 945 0.16 141 5,508 209 5,298 465.34 5,298 0.12
64 960 0.18 162 5,461 209 5,251 465.33 5,251 0.12
65 975 0.04 33 5,284 209 5,075 465.32 5,075 0.12
66 990 0.04 33 5,108 209 4,898 465.31 4,898 0.11
67 1005 0.03 25 4,923 209 4,714 465.30 4,714 0.11
68 1020 0.03 25 4,738 209 4,529 465.29 4,529 0.10
69 1035 0.05 41 4,570 209 4,361 465.28 4,361 0.10
70 1050 0.05 41 4,402 209 4,193 465.27 4,193 0.10
71 1065 0.05 41 4,234 209 4,024 465.25 4,024 0.09
72 1080 0.04 33 4,057 209 3,848 465.24 3,848 0.09
73 1095 0.04 33 3,881 209 3,671 465.23 3,671 0.08
74 1110 0.04 33 3,704 209 3,495 465.22 3,495 0.08
75 1125 0.03 25 3,520 209 3,310 465.21 3,310 0.08
76 1140 0.02 3,327 16 209 3,117 465.20 3,117 0.07
77 1155 0.03 25 3,142 209 2,933 465.19 2,933 0.07
78 1170 0.04 33 2,966 209 2,756 465.17 2,756 0.06
79 1185 0.03 25 2,781 209 2,572 465.16 2,572 0.06
80 1200 0.02 16 2,588 209 2,379 465.15 2,379 0.05
81 1215 0.03 25 2,403 209 2,194 465.14 2,194 0.05
82 1230 0.03 25 2,219 209 2,009 465.13 2,009 0.05
83 1245 0.03 25 2,034 209 1,825 465.12 1,825 0.04
84 1260 0.02 16 1,841 209 1,632 465.10 1,632 0.04
85 1275 0.03 25 1,656 209 1,447 465.09 1,447 0.03
86 1290 0.02 16 1,463 209 1,254 465.08 1,254 0.03
87 1305 0.03 25 1,279 209 1,069 465.07 1,069 0.02
88 1320 0.02 16 1,086 209 876 465.06 876 0.02
89 1335 0.03 25 901 209 692 465.04 692 0.02
90 1350 0.02 16 708 209 499 465.03 499 0.01
91 1365 0.02 16 515 209 306 465.02 306 0.01
92 1380 0.02 16 322 209 113 465.01 113 0.00
93 1395 0.02 16 129 209 - 465.00 - 0.00
94 1410 0.02 16 16 209 - 465.00 - 0.00
95 1425 0.02 16 16 209 - 465.00 - 0.00
96 1440 0.02 16 16 209 - 465.00 - 0.00
Basin Depth Analysis

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Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 4

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.33
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 6.56

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 0.9

RETENTION BASIN

GOLF COURSE

MOUNTAINOUS
LOW LOSS RATE (PERCENT) 90%
LENGTH OF WATERCOURSE (L) 620
LENGTH TO POINT OPPOSITE CENTROID (Lca) 70
ELEVATION OF HEADWATER 470.5
ELEVATION OF CONCENTRATION POINT 468
AVERAGE MANNINGS 'N' VALUE 0.02
STORM FREQUENCY (YEAR) 100

POINT RAIN
3-HOUR 1.04
6-HOUR 1.36
24-HOUR 2.23
BASIN CHARACTERISTICS: ELEVATION AREA
464.5 13730
465.5 15200
466.5 16700
467.5 18270
468 19075
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 980 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

1.04 9.790 1.00 1.04 1.36 9.790 1.00 1.36 2.23 9.790 1.00 2.23

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 9.79 SUM [7] 1.04 SUM [9] 9.79 SUM [11] 1.36 SUM [13] 9.79 SUM [15] 2.23 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 1.04 1.36 2.23
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 0.47 0.47 0.37
FLOOD VOLUME (cu-ft) 16,627 16,600 13,067
(acre-ft) 0.38 0.38 0.30
REQUIRED STORAGE (cu-ft) 14,362 13,085 5,344
(acre-ft) 0.33 0.30 0.12
PEAK FLOW (cfs) 8.01 6.94 1.24
MAXIMUM WSEL (ft) 465.49 465.40 464.87
24-HOURS
[15] LAG TIME-HOURS
[16] LAG TIME-MINUTES

0.21 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS 6-HOURS
[6] La-FEET
[7] La-MILES
[8] ELEVATION OF HEADWATER
[9] ELEVATION OF CONCENTRATION POINT
[2] AREA DESIGNATION
[3] AREA - ACRES
[4] L-FEET
[5] L-MILES
5 0.02

1.4 1.4

2.8 21.3

4.61 0.02

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 4

9.790
620

0.013
470.5
468

0.117

70.00 0.000
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 2.5
[11] S-FEET/MILE
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 10 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

RATE IMPERVIOUS RATE
(in/hr) (in/hr) (in/hr)
[Plate C-1] [Plate E-6.1] [Plate E-6.2] [Plate E-6.3]
B 56 0.52 90% 0.10 0.00 0.000 0.0000
B 56 0.52 100% 0.05 2.33 0.238 0.0124
B 56 0.52 20% 0.43 0.00 0.000 0.0000B 56 0.52 40% 0.33 0.00 0.000 0.0000B 56 0.52 50% 0.29 0.00 0.000 0.0000B 56 0.52 65% 0.22 6.56 0.670 0.1446B 56 0.52 80% 0.15 0.00 0.000 0.0000B 56 0.52 75% 0.17 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.90 0.092 0.0478B 56 0.52 0% 0.52 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.00 0.000 0.0000 D 93 0.95 90% 0.18 0.00 0.000 0.0000

0.00 0.000 0.0000

0.00 0.000 0.0000
SUM 9.79 SUM 0.2048
VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY)Fm= 0.102390603C= 0.00190Ft=C(24-(T/60))^1.55 = 0.00190 0.10 in/hr LOW LOSS RATE (80-90 PERCENT) = 90%Where:T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,T=1 1/2 unit time for the second period, etc.

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS
(24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 9.79
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.38
UNIT TIME-PERCENT OF LAG 362.1
TOTAL ADJUSTED STORM RAIN-INCHES 1.04
CONSTANT LOSS RATE-in/hr 0.20
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.21 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.162 0.20 0.15 0.02 0.16 0.00
2 10 0.17 1.3 0.162 0.20 0.15 0.02 0.16 0.00
3 15 0.25 1.1 0.137 0.20 0.12 0.01 0.13 0.00
4 20 0.33 1.5 0.187 0.20 0.17 0.02 0.18 0.00
5 25 0.42 1.5 0.187 0.20 0.17 0.02 0.18 0.00
6 30 0.50 1.8 0.225 0.20 0.20 0.02 0.19 0.00
7 35 0.58 1.5 0.187 0.20 0.17 0.02 0.18 0.00
8 40 0.67 1.8 0.225 0.20 0.20 0.02 0.19 0.00
9 45 0.75 1.8 0.225 0.20 0.20 0.02 0.19 0.00
10 50 0.83 1.5 0.187 0.20 0.17 0.02 0.18 0.00
11 55 0.92 1.6 0.200 0.20 0.18 0.02 0.20 0.00
12 60 1.00 1.8 0.225 0.20 0.20 0.02 0.19 0.00
13 65 1.08 2.2 0.275 0.20 0.25 0.07 0.68 141.06
14 70 1.17 2.2 0.275 0.20 0.25 0.07 0.68 141.06
15 75 1.25 2.2 0.275 0.20 0.25 0.07 0.68 141.06
16 80 1.33 2.0 0.250 0.20 0.22 0.04 0.44 67.75
17 85 1.42 2.6 0.324 0.20 0.29 0.12 1.17 287.67
18 90 1.50 2.7 0.337 0.20 0.30 0.13 1.29 324.33
19 95 1.58 2.4 0.300 0.20 0.27 0.09 0.93 214.37
20 100 1.67 2.7 0.337 0.20 0.30 0.13 1.29 324.33
21 105 1.75 3.3 0.412 0.20 0.37 0.21 2.03 544.25
22 110 1.83 3.1 0.387 0.20 0.35 0.18 1.78 470.94
23 115 1.92 2.9 0.362 0.20 0.33 0.16 1.54 397.63
24 120 2.00 3.0 0.374 0.20 0.34 0.17 1.66 434.29
25 125 2.08 3.1 0.387 0.20 0.35 0.18 1.78 470.94
26 130 2.17 4.2 0.524 0.20 0.47 0.32 3.13 874.13
27 135 2.25 5.0 0.624 0.20 0.56 0.42 4.10 1167.36
28 140 2.33 3.5 0.437 0.20 0.39 0.23 2.27 617.56
29 145 2.42 6.8 0.849 0.20 0.76 0.64 6.30 1827.13
30 150 2.50 7.3 0.911 0.20 0.82 0.71 6.91 2010.40
31 155 2.58 8.2 1.023 0.20 0.92 0.82 8.01 2340.28
32 160 2.67 5.9 0.736 0.20 0.66 0.53 5.20 1497.25
33 165 2.75 2.0 0.250 0.20 0.22 0.04 0.44 67.75
34 170 2.83 1.8 0.225 0.20 0.20 0.02 0.19 0.00
35 175 2.92 1.8 0.225 0.20 0.20 0.02 0.19 0.00
36 180 3.00 0.6 0.075 0.20 0.07 0.01 0.07 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.47
FLOOD VOLUME (acft) 0.38
FLOOD VOLUME (cuft) 16626.67
REQUIRED STORAGE (acft) 0.33
REQUIRED STORAGE (cuft) 14361.53
PEAK FLOW RATE (cfs) 8.01
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.79
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.38
UNIT TIME-PERCENT OF LAG 362.1
TOTAL ADJUSTED STORM RAIN-INCHES 1.36
CONSTANT LOSS RATE-in/hr 0.205
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.21 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.082 0.20 0.07 0.01 0.08 0.00
2 10 0.17 0.6 0.098 0.20 0.09 0.01 0.10 0.00
3 15 0.25 0.6 0.098 0.20 0.09 0.01 0.10 0.00
4 20 0.33 0.6 0.098 0.20 0.09 0.01 0.10 0.00
5 25 0.42 0.6 0.098 0.20 0.09 0.01 0.10 0.00
6 30 0.50 0.7 0.114 0.20 0.10 0.01 0.11 0.00
7 35 0.58 0.7 0.114 0.20 0.10 0.01 0.11 0.00
8 40 0.67 0.7 0.114 0.20 0.10 0.01 0.11 0.00
9 45 0.75 0.7 0.114 0.20 0.10 0.01 0.11 0.00
10 50 0.83 0.7 0.114 0.20 0.10 0.01 0.11 0.00
11 55 0.92 0.7 0.114 0.20 0.10 0.01 0.11 0.00
12 60 1.00 0.8 0.131 0.20 0.12 0.01 0.13 0.00
13 65 1.08 0.8 0.131 0.20 0.12 0.01 0.13 0.00
14 70 1.17 0.8 0.131 0.20 0.12 0.01 0.13 0.00
15 75 1.25 0.8 0.131 0.20 0.12 0.01 0.13 0.00
16 80 1.33 0.8 0.131 0.20 0.12 0.01 0.13 0.00
17 85 1.42 0.8 0.131 0.20 0.12 0.01 0.13 0.00
18 90 1.50 0.8 0.131 0.20 0.12 0.01 0.13 0.00
19 95 1.58 0.8 0.131 0.20 0.12 0.01 0.13 0.00
20 100 1.67 0.8 0.131 0.20 0.12 0.01 0.13 0.00
21 105 1.75 0.8 0.131 0.20 0.12 0.01 0.13 0.00
22 110 1.83 0.8 0.131 0.20 0.12 0.01 0.13 0.00
23 115 1.92 0.8 0.131 0.20 0.12 0.01 0.13 0.00
24 120 2.00 0.9 0.147 0.20 0.13 0.01 0.14 0.00
25 125 2.08 0.8 0.131 0.20 0.12 0.01 0.13 0.00
26 130 2.17 0.9 0.147 0.20 0.13 0.01 0.14 0.00
27 135 2.25 0.9 0.147 0.20 0.13 0.01 0.14 0.00
28 140 2.33 0.9 0.147 0.20 0.13 0.01 0.14 0.00
29 145 2.42 0.9 0.147 0.20 0.13 0.01 0.14 0.00
30 150 2.50 0.9 0.147 0.20 0.13 0.01 0.14 0.00
31 155 2.58 0.9 0.147 0.20 0.13 0.01 0.14 0.00
32 160 2.67 0.9 0.147 0.20 0.13 0.01 0.14 0.00
33 165 2.75 1.0 0.163 0.20 0.15 0.02 0.16 0.00
34 170 2.83 1.0 0.163 0.20 0.15 0.02 0.16 0.00
35 175 2.92 1.0 0.163 0.20 0.15 0.02 0.16 0.00
36 180 3.00 1.0 0.163 0.20 0.15 0.02 0.16 0.00
37 185 3.08 1.0 0.163 0.20 0.15 0.02 0.16 0.00
38 190 3.17 1.1 0.180 0.20 0.16 0.02 0.18 0.00
39 195 3.25 1.1 0.180 0.20 0.16 0.02 0.18 0.00
40 200 3.33 1.1 0.180 0.20 0.16 0.02 0.18 0.00
41 205 3.42 1.2 0.196 0.20 0.18 0.02 0.19 0.00
42 210 3.50 1.3 0.212 0.20 0.19 0.01 0.07 0.00
43 215 3.58 1.4 0.228 0.20 0.21 0.02 0.23 5.72
44 220 3.67 1.4 0.228 0.20 0.21 0.02 0.23 5.72
45 225 3.75 1.5 0.245 0.20 0.22 0.04 0.39 53.65
46 230 3.83 1.5 0.245 0.20 0.22 0.04 0.39 53.65
47 235 3.92 1.6 0.261 0.20 0.24 0.06 0.55 101.58
48 240 4.00 1.6 0.261 0.20 0.24 0.06 0.55 101.58
49 245 4.08 1.7 0.277 0.20 0.25 0.07 0.71 149.52
50 250 4.17 1.8 0.294 0.20 0.26 0.09 0.87 197.45
51 255 4.25 1.9 0.310 0.20 0.28 0.11 1.03 245.38
52 260 4.33 2.0 0.326 0.20 0.29 0.12 1.19 293.31
53 265 4.42 2.1 0.343 0.20 0.31 0.14 1.35 341.24
54 270 4.50 2.1 0.343 0.20 0.31 0.14 1.35 341.24
55 275 4.58 2.2 0.359 0.20 0.32 0.15 1.51 389.18
56 280 4.67 2.3 0.375 0.20 0.34 0.17 1.67 437.11

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.392 0.20 0.35 0.19 1.83 485.04
58 290 4.83 2.4 0.392 0.20 0.35 0.19 1.83 485.04
59 295 4.92 2.5 0.408 0.20 0.37 0.20 1.99 532.97
60 300 5.00 2.6 0.424 0.20 0.38 0.22 2.15 580.90
61 305 5.08 3.1 0.506 0.20 0.46 0.30 2.95 820.56
62 310 5.17 3.6 0.588 0.20 0.53 0.38 3.75 1060.22
63 315 5.25 3.9 0.636 0.20 0.57 0.43 4.23 1204.02
64 320 5.33 4.2 0.685 0.20 0.62 0.48 4.71 1347.81
65 325 5.42 4.7 0.767 0.20 0.69 0.56 5.50 1587.47
66 330 5.50 5.6 0.914 0.20 0.82 0.71 6.94 2018.86
67 335 5.58 1.9 0.310 0.20 0.28 0.11 1.03 245.38
68 340 5.67 0.9 0.147 0.20 0.13 0.01 0.14 0.00
69 345 5.75 0.6 0.098 0.20 0.09 0.01 0.10 0.00
70 350 5.83 0.5 0.082 0.20 0.07 0.01 0.08 0.00
71 355 5.92 0.3 0.049 0.20 0.04 0.00 0.05 0.00
72 360 6.00 0.2 0.033 0.20 0.03 0.00 0.03 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.47
FLOOD VOLUME (acft) 0.38
FLOOD VOLUME (cuft) 16599.70
REQUIRED STORAGE (acft) 0.30
REQUIRED STORAGE (cuft) 13084.61
PEAK FLOW RATE (cfs) 6.94
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.790 CONSTANT LOSS RATE-in/hr n/a
UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2048 LAG TIME - MINUTES 1.38 MINIMUM LOSS RATE (for var. loss) - in/hr 0.102 UNIT TIME-PERCENT OF LAG 1086.4 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00190
PERCOLATION RATE (cfs) 0.21
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.018 0.362 0.016 0.002 0.02 0.00
2 30 0.50 0.3 0.027 0.357 0.024 0.003 0.03 0.00
3 45 0.75 0.3 0.027 0.353 0.024 0.003 0.03 0.00
4 60 1.00 0.4 0.036 0.349 0.032 0.004 0.03 0.00
5 75 1.25 0.3 0.027 0.345 0.024 0.003 0.03 0.00
6 90 1.50 0.3 0.027 0.341 0.024 0.003 0.03 0.00
7 105 1.75 0.3 0.027 0.337 0.024 0.003 0.03 0.00
8 120 2.00 0.4 0.036 0.333 0.032 0.004 0.03 0.00
9 135 2.25 0.4 0.036 0.329 0.032 0.004 0.03 0.00
10 150 2.50 0.4 0.036 0.325 0.032 0.004 0.03 0.00
11 165 2.75 0.5 0.045 0.321 0.040 0.004 0.04 0.00
12 180 3.00 0.5 0.045 0.317 0.040 0.004 0.04 0.00
13 195 3.25 0.5 0.045 0.313 0.040 0.004 0.04 0.00
14 210 3.50 0.5 0.045 0.309 0.040 0.004 0.04 0.00
15 225 3.75 0.5 0.045 0.305 0.040 0.004 0.04 0.00
16 240 4.00 0.6 0.054 0.301 0.048 0.005 0.05 0.00
17 255 4.25 0.6 0.054 0.297 0.048 0.005 0.05 0.00
18 270 4.50 0.7 0.062 0.294 0.056 0.006 0.06 0.00
19 285 4.75 0.7 0.062 0.290 0.056 0.006 0.06 0.00
20 300 5.00 0.8 0.071 0.286 0.064 0.007 0.07 0.00
21 315 5.25 0.6 0.054 0.282 0.048 0.005 0.05 0.00
22 330 5.50 0.7 0.062 0.279 0.056 0.006 0.06 0.00
23 345 5.75 0.8 0.071 0.275 0.064 0.007 0.07 0.00
24 360 6.00 0.8 0.071 0.272 0.064 0.007 0.07 0.00
25 375 6.25 0.9 0.080 0.268 0.072 0.008 0.08 0.00
26 390 6.50 0.9 0.080 0.264 0.072 0.008 0.08 0.00
27 405 6.75 1.0 0.089 0.261 0.080 0.009 0.09 0.00
28 420 7.00 1.0 0.089 0.257 0.080 0.009 0.09 0.00
29 435 7.25 1.0 0.089 0.254 0.080 0.009 0.09 0.00
30 450 7.50 1.1 0.098 0.250 0.088 0.010 0.10 0.00
31 465 7.75 1.2 0.107 0.247 0.096 0.011 0.10 0.00
32 480 8.00 1.3 0.116 0.243 0.104 0.012 0.11 0.00
33 495 8.25 1.5 0.134 0.240 0.120 0.013 0.13 0.00
34 510 8.50 1.5 0.134 0.237 0.120 0.013 0.13 0.00
35 525 8.75 1.6 0.143 0.233 0.128 0.014 0.14 0.00
36 540 9.00 1.7 0.152 0.230 0.136 0.015 0.15 0.00
37 555 9.25 1.9 0.169 0.227 0.153 0.017 0.17 0.00
38 570 9.50 2.0 0.178 0.224 0.161 0.018 0.17 0.00
39 585 9.75 2.1 0.187 0.220 0.169 0.019 0.18 0.00
40 600 10.00 2.2 0.196 0.217 0.177 0.020 0.19 0.00
41 615 10.25 1.5 0.134 0.214 0.120 0.013 0.13 0.00
42 630 10.50 1.5 0.134 0.211 0.120 0.013 0.13 0.00
43 645 10.75 2.0 0.178 0.208 0.161 0.018 0.17 0.00
44 660 11.00 2.0 0.178 0.205 0.161 0.018 0.17 0.00
45 675 11.25 1.9 0.169 0.202 0.153 0.017 0.17 0.00
46 690 11.50 1.9 0.169 0.199 0.153 0.017 0.17 0.00
47 705 11.75 1.7 0.152 0.196 0.136 0.015 0.15 0.00
48 720 12.00 1.8 0.161 0.193 0.145 0.016 0.16 0.00
49 735 12.25 2.5 0.223 0.190 0.201 0.033 0.32 97.34
50 750 12.50 2.6 0.232 0.187 0.209 0.045 0.44 201.03
51 765 12.75 2.8 0.250 0.185 0.225 0.065 0.64 383.03
52 780 13.00 2.9 0.259 0.182 0.233 0.077 0.75 486.13
53 795 13.25 3.4 0.303 0.179 0.273 0.124 1.22 903.31
54 810 13.50 3.4 0.303 0.176 0.273 0.127 1.24 927.21
55 825 13.75 2.3 0.205 0.174 0.185 0.032 0.31 86.27
56 840 14.00 2.3 0.205 0.171 0.185 0.034 0.33 109.55
57 855 14.25 2.7 0.241 0.168 0.217 0.072 0.71 446.90
58 870 14.50 2.6 0.232 0.166 0.209 0.066 0.65 390.96
59 885 14.75 2.6 0.232 0.163 0.209 0.069 0.67 413.29
60 900 15.00 2.5 0.223 0.161 0.201 0.062 0.61 356.70
61 915 15.25 2.4 0.214 0.158 0.193 0.056 0.55 299.78
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
62 930 15.50 2.3 0.205 0.156 0.185 0.049 0.48 242.53
63 945 15.75 1.9 0.169 0.153 0.153 0.016 0.16 0.00
64 960 16.00 1.9 0.169 0.151 0.153 0.018 0.18 0.00
65 975 16.25 0.4 0.036 0.149 0.032 0.004 0.03 0.00
66 990 16.50 0.4 0.036 0.147 0.032 0.004 0.03 0.00
67 1005 16.75 0.3 0.027 0.144 0.024 0.003 0.03 0.00
68 1020 17.00 0.3 0.027 0.142 0.024 0.003 0.03 0.00
69 1035 17.25 0.5 0.045 0.140 0.040 0.004 0.04 0.00
70 1050 17.50 0.5 0.045 0.138 0.040 0.004 0.04 0.00
71 1065 17.75 0.5 0.045 0.136 0.040 0.004 0.04 0.00
72 1080 18.00 0.4 0.036 0.134 0.032 0.004 0.03 0.00
73 1095 18.25 0.4 0.036 0.132 0.032 0.004 0.03 0.00
74 1110 18.50 0.4 0.036 0.130 0.032 0.004 0.03 0.00
75 1125 18.75 0.3 0.027 0.128 0.024 0.003 0.03 0.00
76 1140 19.00 0.2 0.018 0.126 0.016 0.002 0.02 0.00
77 1155 19.25 0.3 0.027 0.124 0.024 0.003 0.03 0.00
78 1170 19.50 0.4 0.036 0.123 0.032 0.004 0.03 0.00
79 1185 19.75 0.3 0.027 0.121 0.024 0.003 0.03 0.00
80 1200 20.00 0.2 0.018 0.119 0.016 0.002 0.02 0.00
81 1215 20.25 0.3 0.027 0.118 0.024 0.003 0.03 0.00
82 1230 20.50 0.3 0.027 0.116 0.024 0.003 0.03 0.00
83 1245 20.75 0.3 0.027 0.115 0.024 0.003 0.03 0.00
84 1260 21.00 0.2 0.018 0.113 0.016 0.002 0.02 0.00
85 1275 21.25 0.3 0.027 0.112 0.024 0.003 0.03 0.00
86 1290 21.50 0.2 0.018 0.111 0.016 0.002 0.02 0.00
87 1305 21.75 0.3 0.027 0.110 0.024 0.003 0.03 0.00
88 1320 22.00 0.2 0.018 0.108 0.016 0.002 0.02 0.00
89 1335 22.25 0.3 0.027 0.107 0.024 0.003 0.03 0.00
90 1350 22.50 0.2 0.018 0.106 0.016 0.002 0.02 0.00
91 1365 22.75 0.2 0.018 0.105 0.016 0.002 0.02 0.00
92 1380 23.00 0.2 0.018 0.105 0.016 0.002 0.02 0.00
93 1395 23.25 0.2 0.018 0.104 0.016 0.002 0.02 0.00
94 1410 23.50 0.2 0.018 0.103 0.016 0.002 0.02 0.00
95 1425 23.75 0.2 0.018 0.103 0.016 0.002 0.02 0.00
96 1440 24.00 0.2 0.018 0.102 0.016 0.002 0.02 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.37
FLOOD VOLUME (acft) 0.30
FLOOD VOLUME (cuft) 13066.60
REQUIRED STORAGE (acft) 0.12
REQUIRED STORAGE (cuft) 5344.02
PEAK FLOW (cfs) 1.24
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

INCR TOTAL INCR TOTAL INCR TOTAL
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
464.5 0 0 13730 0 0 0.00
465.5 1 1 1470 15200 14465 14465 0.33
466.5 1 2 1500 16700 15950 30415 0.70
467.5 1 3 1570 18270 17485 47900 1.10
468 0.5 3.5 805 19075 9336 57236 1.31

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.21 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.21 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.16 48 48 64 - 464.50 - 0.00
2 10 0.16 48 48 64 - 464.50 - 0.00
3 15 0.13 40 40 64 - 464.50 - 0.00
4 20 0.18 55 55 64 - 464.50 - 0.00
5 25 0.18 55 55 64 - 464.50 - 0.00
6 30 0.19 58 58 64 - 464.50 - 0.00
7 35 0.18 55 55 64 - 464.50 - 0.00
8 40 0.19 58 58 64 - 464.50 - 0.00
9 45 0.19 58 58 64 - 464.50 - 0.00
10 50 0.18 55 55 64 - 464.50 - 0.00
11 55 0.20 59 59 64 - 464.50 - 0.00
12 60 0.19 58 58 64 - 464.50 - 0.00
13 65 0.68 205 205 64 141 464.51 141 0.00
14 70 0.68 205 346 64 282 464.52 282 0.01
15 75 0.68 205 487 64 423 464.53 423 0.01
16 80 0.44 132 555 64 491 464.53 491 0.01
17 85 1.17 352 842 64 779 464.55 779 0.02
18 90 1.29 388 1,167 64 1,103 464.58 1,103 0.03
19 95 0.93 278 1,381 64 1,317 464.59 1,317 0.03
20 100 1.29 388 1,705 64 1,642 464.61 1,642 0.04
21 105 2.03 608 2,250 64 2,186 464.65 2,186 0.05
22 110 1.78 535 2,721 64 2,657 464.68 2,657 0.06
23 115 1.54 462 3,118 64 3,054 464.71 3,054 0.07
24 120 1.66 498 3,553 64 3,489 464.74 3,489 0.08
25 125 1.78 535 4,024 64 3,960 464.77 3,960 0.09
26 130 3.13 938 4,898 64 4,834 464.83 4,834 0.11
27 135 4.10 1,231 6,065 64 6,001 464.91 6,001 0.14
28 140 2.27 681 6,683 64 6,619 464.96 6,619 0.15
29 145 6.30 1,891 8,510 64 8,446 465.08 8,446 0.19
30 150 6.91 2,074 10,520 64 10,456 465.22 10,456 0.24
31 155 8.01 2,404 12,860 64 12,797 465.38 12,797 0.29
32 160 5.20 1,561 14,358 64 14,294 465.49 14,294 0.33
33 165 0.44 132 14,425 64 14,362 465.49 14,362 0.33
34 170 0.19 58 14,420 64 14,356 465.49 14,356 0.33
35 175 0.19 58 14,414 64 14,350 465.49 14,350 0.33
36 180 0.07 22 14,372 64 14,309 465.49 14,309 0.33

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.08 24 24 64 - 464.50 - 0.00
2 10 0.10 29 29 64 - 464.50 - 0.00
3 15 0.10 29 29 64 - 464.50 - 0.00
4 20 0.10 29 29 64 - 464.50 - 0.00
5 25 0.10 29 29 64 - 464.50 - 0.00
6 30 0.11 34 34 64 - 464.50 - 0.00
7 35 0.11 34 34 64 - 464.50 - 0.00
8 40 0.11 34 34 64 - 464.50 - 0.00
9 45 0.11 34 34 64 - 464.50 - 0.00
10 50 0.11 34 34 64 - 464.50 - 0.00
11 55 0.11 34 34 64 - 464.50 - 0.00
12 60 0.13 38 38 64 - 464.50 - 0.00
13 65 0.13 38 38 64 - 464.50 - 0.00
14 70 0.13 38 38 64 - 464.50 - 0.00
15 75 0.13 38 38 64 - 464.50 - 0.00
16 80 0.13 38 38 64 - 464.50 - 0.00
17 85 0.13 38 38 64 - 464.50 - 0.00
18 90 0.13 38 38 64 - 464.50 - 0.00
19 95 0.13 38 38 64 - 464.50 - 0.00
20 100 0.13 38 38 64 - 464.50 - 0.00
21 105 0.13 38 38 64 - 464.50 - 0.00
22 110 0.13 38 38 64 - 464.50 - 0.00
23 115 0.13 38 38 64 - 464.50 - 0.00
24 120 0.14 43 43 64 - 464.50 - 0.00
25 125 0.13 38 38 64 - 464.50 - 0.00
26 130 0.14 43 43 64 - 464.50 - 0.00
27 135 0.14 43 43 64 - 464.50 - 0.00
28 140 0.14 43 43 64 - 464.50 - 0.00
29 145 0.14 43 43 64 - 464.50 - 0.00
30 150 0.14 43 43 64 - 464.50 - 0.00
31 155 0.14 43 43 64 - 464.50 - 0.00
32 160 0.14 43 43 64 - 464.50 - 0.00
33 165 0.16 48 48 64 - 464.50 - 0.00
34 170 0.16 48 48 64 - 464.50 - 0.00
35 175 0.16 48 48 64 - 464.50 - 0.00
36 180 0.16 48 48 64 - 464.50 - 0.00
37 185 0.16 48 48 64 - 464.50 - 0.00
38 190 0.18 53 53 64 - 464.50 - 0.00
39 195 0.18 53 53 64 - 464.50 - 0.00
40 200 0.18 53 53 64 - 464.50 - 0.00
41 205 0.19 58 58 64 - 464.50 - 0.00
42 210 0.07 22 22 64 - 464.50 - 0.00
43 215 0.23 70 70 64 6 464.50 0.00 6
44 220 0.23 70 75 64 11 464.50 11 0.00
45 225 0.39 118 129 64 65 464.50 65 0.00
46 230 0.39 118 183 64 119 464.51 119 0.00
47 235 0.55 165 284 64 220 464.52 220 0.01
48 240 0.55 165 386 64 322 464.52 322 0.01
49 245 0.71 213 535 64 471 464.53 471 0.01
50 250 0.87 261 733 64 669 464.55 669 0.02
51 255 1.03 309 978 64 914 464.56 914 0.02
52 260 1.19 357 1,271 64 1,208 464.58 1,208 0.03
53 265 1.35 405 1,613 64 1,549 464.61 1,549 0.04
54 270 1.35 405 1,954 64 1,890 464.63 1,890 0.04
55 275 1.51 453 2,343 64 2,279 464.66 2,279 0.05

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 1.67 501 2,780 64 2,716 464.69 2,716 0.06
57 285 1.83 549 3,265 64 3,201 464.72 3,201 0.07
58 290 1.83 549 3,750 64 3,686 464.75 3,686 0.08
59 295 1.99 597 4,283 64 4,219 464.79 4,219 0.10
60 300 2.15 645 4,864 64 4,800 464.83 4,800 0.11
61 305 2.95 884 5,685 64 5,621 464.89 5,621 0.13
62 310 3.75 1,124 6,745 64 6,681 464.96 6,681 0.15
63 315 4.23 1,268 7,949 64 7,885 465.05 7,885 0.18
64 320 4.71 1,412 9,297 64 9,233 465.14 9,233 0.21
65 325 5.50 1,651 10,884 64 10,820 465.25 10,820 0.25
66 330 6.94 2,083 12,903 64 12,839 465.39 12,839 0.29
67 335 1.03 309 13,148 64 13,085 465.40 13,085 0.30
68 340 0.14 43 13,128 64 13,064 465.40 13,064 0.30
69 345 0.10 29 13,093 64 13,029 465.40 13,029 0.30
70 350 0.08 24 13,053 64 12,989 465.40 12,989 0.30
71 355 0.05 14 13,003 64 12,939 465.39 12,939 0.30
72 360 0.03 10 12,949 64 12,885 465.39 12,885 0.30
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.02 16 16 192 - 464.50 - 0.00
2 30 0.03 24 24 192 - 464.50 - 0.00
3 45 0.03 24 24 192 - 464.50 - 0.00
4 60 0.03 31 31 192 - 464.50 - 0.00
5 75 0.03 24 24 192 - 464.50 - 0.00
6 90 0.03 24 24 192 - 464.50 - 0.00
7 105 0.03 24 24 192 - 464.50 - 0.00
8 120 0.03 31 31 192 - 464.50 - 0.00
9 135 0.03 31 31 192 - 464.50 - 0.00
10 150 0.03 31 31 192 - 464.50 - 0.00
11 165 0.04 39 39 192 - 464.50 - 0.00
12 180 0.04 39 39 192 - 464.50 - 0.00
13 195 0.04 39 39 192 - 464.50 - 0.00
14 210 0.04 39 39 192 - 464.50 - 0.00
15 225 0.04 39 39 192 - 464.50 - 0.00
16 240 0.05 47 47 192 - 464.50 - 0.00
17 255 0.05 47 47 192 - 464.50 - 0.00
18 270 0.06 55 55 192 - 464.50 - 0.00
19 285 0.06 55 55 192 - 464.50 - 0.00
20 300 0.07 63 63 192 - 464.50 - 0.00
21 315 0.05 47 47 192 - 464.50 - 0.00
22 330 0.06 55 55 192 - 464.50 - 0.00
23 345 0.07 63 63 192 - 464.50 - 0.00
24 360 0.07 63 63 192 - 464.50 - 0.00
25 375 0.08 71 71 192 - 464.50 - 0.00
26 390 0.08 71 71 192 - 464.50 - 0.00
27 405 0.09 79 79 192 - 464.50 - 0.00
28 420 0.09 79 79 192 - 464.50 - 0.00
29 435 0.09 79 79 192 - 464.50 - 0.00
30 450 0.10 86 86 192 - 464.50 - 0.00
31 465 0.10 94 94 192 - 464.50 - 0.00
32 480 0.11 102 102 192 - 464.50 - 0.00
33 495 0.13 118 118 192 - 464.50 - 0.00
34 510 0.13 118 118 192 - 464.50 - 0.00
35 525 0.14 126 126 192 - 464.50 - 0.00
36 540 0.15 134 134 192 - 464.50 - 0.00
37 555 0.17 149 149 192 - 464.50 - 0.00
38 570 0.17 157 157 192 - 464.50 - 0.00
39 585 0.18 165 165 192 - 464.50 - 0.00
40 600 0.19 173 173 192 - 464.50 - 0.00
41 615 0.13 118 118 192 - 464.50 - 0.00
42 630 0.13 118 118 192 - 464.50 - 0.00
43 645 0.17 157 157 192 - 464.50 - 0.00
44 660 0.17 157 157 192 - 464.50 - 0.00
45 675 0.17 149 149 192 - 464.50 - 0.00
46 690 0.17 149 149 192 - 464.50 - 0.00
47 705 0.15 134 134 192 - 464.50 - 0.00
48 720 0.16 141 141 192 - 464.50 - 0.00
49 735 0.32 289 289 192 97 464.51 97 0.00
50 750 0.44 393 490 192 298 464.52 298 0.01
51 765 0.64 575 873 192 681 464.55 681 0.02
52 780 0.75 678 1,359 192 1,168 464.58 1,168 0.03
53 795 1.22 1,095 2,262 192 2,071 464.64 2,071 0.05
54 810 1.24 1,119 3,190 192 2,998 464.71 2,998 0.07
55 825 0.31 278 3,276 192 3,084 464.71 3,084 0.07
56 840 0.33 301 3,386 192 3,194 464.72 3,194 0.07
57 855 0.71 639 3,832 192 3,641 464.75 3,641 0.08
58 870 0.65 583 4,223 192 4,032 464.78 4,032 0.09

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.67 605 4,637 192 4,445 464.81 4,445 0.10
60 900 0.61 548 4,993 192 4,802 464.83 4,802 0.11
61 915 0.55 491 5,293 192 5,101 464.85 5,101 0.12
62 930 0.48 434 5,536 192 5,344 464.87 5,344 0.12
63 945 0.16 141 5,485 192 5,293 464.87 5,293 0.12
64 960 0.18 161 5,455 192 5,263 464.86 5,263 0.12
65 975 0.03 31 5,294 192 5,103 464.85 5,103 0.12
66 990 0.03 31 5,134 192 4,943 464.84 4,943 0.11
67 1005 0.03 24 4,966 192 4,775 464.83 4,775 0.11
68 1020 0.03 24 4,798 192 4,606 464.82 4,606 0.11
69 1035 0.04 39 4,646 192 4,454 464.81 4,454 0.10
70 1050 0.04 39 4,493 192 4,302 464.80 4,302 0.10
71 1065 0.04 39 4,341 192 4,149 464.79 4,149 0.10
72 1080 0.03 31 4,181 192 3,989 464.78 3,989 0.09
73 1095 0.03 31 4,021 192 3,829 464.76 3,829 0.09
74 1110 0.03 31 3,860 192 3,669 464.75 3,669 0.08
75 1125 0.03 24 3,692 192 3,501 464.74 3,501 0.08
76 1140 0.02 3,516 16 192 3,325 464.73 3,325 0.08
77 1155 0.03 24 3,348 192 3,157 464.72 3,157 0.07
78 1170 0.03 31 3,188 192 2,996 464.71 2,996 0.07
79 1185 0.03 24 3,020 192 2,828 464.70 2,828 0.06
80 1200 0.02 16 2,844 192 2,652 464.68 2,652 0.06
81 1215 0.03 24 2,676 192 2,484 464.67 2,484 0.06
82 1230 0.03 24 2,508 192 2,316 464.66 2,316 0.05
83 1245 0.03 24 2,340 192 2,148 464.65 2,148 0.05
84 1260 0.02 16 2,164 192 1,972 464.64 1,972 0.05
85 1275 0.03 24 1,996 192 1,804 464.62 1,804 0.04
86 1290 0.02 16 1,820 192 1,628 464.61 1,628 0.04
87 1305 0.03 24 1,652 192 1,460 464.60 1,460 0.03
88 1320 0.02 16 1,476 192 1,284 464.59 1,284 0.03
89 1335 0.03 24 1,308 192 1,116 464.58 1,116 0.03
90 1350 0.02 16 1,132 192 940 464.57 940 0.02
91 1365 0.02 16 956 192 764 464.55 764 0.02
92 1380 0.02 16 780 192 588 464.54 588 0.01
93 1395 0.02 16 604 192 413 464.53 413 0.01
94 1410 0.02 16 428 192 237 464.52 237 0.01
95 1425 0.02 16 252 192 61 464.50 61 0.00
96 1440 0.02 16 76 192 - 464.50 - 0.00
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 5

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 1.95
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 4.71

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 2.83

RETENTION BASIN

GOLF COURSE

MOUNTAINOUS
LOW LOSS RATE (PERCENT) 90%
LENGTH OF WATERCOURSE (L) 950
LENGTH TO POINT OPPOSITE CENTROID (Lca) 310
ELEVATION OF HEADWATER 471
ELEVATION OF CONCENTRATION POINT 467
AVERAGE MANNINGS 'N' VALUE 0.02
STORM FREQUENCY (YEAR) 100

POINT RAIN
3-HOUR 1.04
6-HOUR 1.36
24-HOUR 2.23
BASIN CHARACTERISTICS: ELEVATION AREA
463.5 17610
464.5 19400
465.5 21240
466.5 23140
467 24110
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 994 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

1.04 9.490 1.00 1.04 1.36 9.490 1.00 1.36 2.23 9.490 1.00 2.23

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 9.49 SUM [7] 1.04 SUM [9] 9.49 SUM [11] 1.36 SUM [13] 9.49 SUM [15] 2.23 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 1.04 1.36 2.23
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 0.36 0.35 0.22
FLOOD VOLUME (cu-ft) 12,335 12,150 7,524
(acre-ft) 0.28 0.28 0.17
REQUIRED STORAGE (cu-ft) 9,965 8,400 646
(acre-ft) 0.23 0.19 0.01
PEAK FLOW (cfs) 7.12 6.08 0.65
MAXIMUM WSEL (ft) 464.04 463.95 463.53

0.180
310.00

0.002
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 4
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 5

9.490
950

0.059
471
467

0.05 2.8

2.8 5.7

22.2 4.72

0.27 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 10 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

RATE IMPERVIOUS RATE
(in/hr) (in/hr) (in/hr)
[Plate C-1] [Plate E-6.1] [Plate E-6.2] [Plate E-6.3]
B 56 0.52 90% 0.10 0.00 0.000 0.0000
B 56 0.52 100% 0.05 1.95 0.205 0.0107
B 56 0.52 20% 0.43 0.00 0.000 0.0000B 56 0.52 40% 0.33 0.00 0.000 0.0000B 56 0.52 50% 0.29 0.00 0.000 0.0000B 56 0.52 65% 0.22 4.71 0.496 0.1071B 56 0.52 80% 0.15 0.00 0.000 0.0000B 56 0.52 75% 0.17 0.00 0.000 0.0000B 56 0.52 0% 0.52 2.83 0.298 0.1551B 56 0.52 0% 0.52 0.00 0.000 0.0000B 56 0.52 0% 0.52 0.00 0.000 0.0000 D 93 0.95 90% 0.18 0.00 0.000 0.0000

0.00 0.000 0.0000

0.00 0.000 0.0000
SUM 9.49 SUM 0.2729
VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY)Fm= 0.136428767C= 0.00253Ft=C(24-(T/60))^1.55 = 0.00253 0.14 in/hr LOW LOSS RATE (80-90 PERCENT) = 90%Where:T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,T=1 1/2 unit time for the second period, etc. (24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 9.49
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.83
UNIT TIME-PERCENT OF LAG 176.4
TOTAL ADJUSTED STORM RAIN-INCHES 1.04
CONSTANT LOSS RATE-in/hr 0.27
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.27 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.162 0.27 0.15 0.02 0.15 0.00
2 10 0.17 1.3 0.162 0.27 0.15 0.02 0.15 0.00
3 15 0.25 1.1 0.137 0.27 0.12 0.01 0.13 0.00
4 20 0.33 1.5 0.187 0.27 0.17 0.02 0.18 0.00
5 25 0.42 1.5 0.187 0.27 0.17 0.02 0.18 0.00
6 30 0.50 1.8 0.225 0.27 0.20 0.02 0.21 0.00
7 35 0.58 1.5 0.187 0.27 0.17 0.02 0.18 0.00
8 40 0.67 1.8 0.225 0.27 0.20 0.02 0.21 0.00
9 45 0.75 1.8 0.225 0.27 0.20 0.02 0.21 0.00
10 50 0.83 1.5 0.187 0.27 0.17 0.02 0.18 0.00
11 55 0.92 1.6 0.200 0.27 0.18 0.02 0.19 0.00
12 60 1.00 1.8 0.225 0.27 0.20 0.02 0.21 0.00
13 65 1.08 2.2 0.275 0.27 0.25 0.00 0.02 0.00
14 70 1.17 2.2 0.275 0.27 0.25 0.00 0.02 0.00
15 75 1.25 2.2 0.275 0.27 0.25 0.00 0.02 0.00
16 80 1.33 2.0 0.250 0.27 0.22 0.02 0.24 0.00
17 85 1.42 2.6 0.324 0.27 0.29 0.05 0.49 65.03
18 90 1.50 2.7 0.337 0.27 0.30 0.06 0.61 100.56
19 95 1.58 2.4 0.300 0.27 0.27 0.03 0.25 0.00
20 100 1.67 2.7 0.337 0.27 0.30 0.06 0.61 100.56
21 105 1.75 3.3 0.412 0.27 0.37 0.14 1.32 313.75
22 110 1.83 3.1 0.387 0.27 0.35 0.11 1.08 242.69
23 115 1.92 2.9 0.362 0.27 0.33 0.09 0.85 171.63
24 120 2.00 3.0 0.374 0.27 0.34 0.10 0.96 207.16
25 125 2.08 3.1 0.387 0.27 0.35 0.11 1.08 242.69
26 130 2.17 4.2 0.524 0.27 0.47 0.25 2.38 633.52
27 135 2.25 5.0 0.624 0.27 0.56 0.35 3.33 917.77
28 140 2.33 3.5 0.437 0.27 0.39 0.16 1.56 384.81
29 145 2.42 6.8 0.849 0.27 0.76 0.58 5.46 1557.32
30 150 2.50 7.3 0.911 0.27 0.82 0.64 6.06 1734.97
31 155 2.58 8.2 1.023 0.27 0.92 0.75 7.12 2054.75
32 160 2.67 5.9 0.736 0.27 0.66 0.46 4.40 1237.54
33 165 2.75 2.0 0.250 0.27 0.22 0.02 0.24 0.00
34 170 2.83 1.8 0.225 0.27 0.20 0.02 0.21 0.00
35 175 2.92 1.8 0.225 0.27 0.20 0.02 0.21 0.00
36 180 3.00 0.6 0.075 0.27 0.07 0.01 0.07 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.36
FLOOD VOLUME (acft) 0.28
FLOOD VOLUME (cuft) 12334.87
REQUIRED STORAGE (acft) 0.23
REQUIRED STORAGE (cuft) 9964.74
PEAK FLOW RATE (cfs) 7.12
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.49
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.83
UNIT TIME-PERCENT OF LAG 176.4
TOTAL ADJUSTED STORM RAIN-INCHES 1.36
CONSTANT LOSS RATE-in/hr 0.273
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.27 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.082 0.27 0.07 0.01 0.08 0.00
2 10 0.17 0.6 0.098 0.27 0.09 0.01 0.09 0.00
3 15 0.25 0.6 0.098 0.27 0.09 0.01 0.09 0.00
4 20 0.33 0.6 0.098 0.27 0.09 0.01 0.09 0.00
5 25 0.42 0.6 0.098 0.27 0.09 0.01 0.09 0.00
6 30 0.50 0.7 0.114 0.27 0.10 0.01 0.11 0.00
7 35 0.58 0.7 0.114 0.27 0.10 0.01 0.11 0.00
8 40 0.67 0.7 0.114 0.27 0.10 0.01 0.11 0.00
9 45 0.75 0.7 0.114 0.27 0.10 0.01 0.11 0.00
10 50 0.83 0.7 0.114 0.27 0.10 0.01 0.11 0.00
11 55 0.92 0.7 0.114 0.27 0.10 0.01 0.11 0.00
12 60 1.00 0.8 0.131 0.27 0.12 0.01 0.12 0.00
13 65 1.08 0.8 0.131 0.27 0.12 0.01 0.12 0.00
14 70 1.17 0.8 0.131 0.27 0.12 0.01 0.12 0.00
15 75 1.25 0.8 0.131 0.27 0.12 0.01 0.12 0.00
16 80 1.33 0.8 0.131 0.27 0.12 0.01 0.12 0.00
17 85 1.42 0.8 0.131 0.27 0.12 0.01 0.12 0.00
18 90 1.50 0.8 0.131 0.27 0.12 0.01 0.12 0.00
19 95 1.58 0.8 0.131 0.27 0.12 0.01 0.12 0.00
20 100 1.67 0.8 0.131 0.27 0.12 0.01 0.12 0.00
21 105 1.75 0.8 0.131 0.27 0.12 0.01 0.12 0.00
22 110 1.83 0.8 0.131 0.27 0.12 0.01 0.12 0.00
23 115 1.92 0.8 0.131 0.27 0.12 0.01 0.12 0.00
24 120 2.00 0.9 0.147 0.27 0.13 0.01 0.14 0.00
25 125 2.08 0.8 0.131 0.27 0.12 0.01 0.12 0.00
26 130 2.17 0.9 0.147 0.27 0.13 0.01 0.14 0.00
27 135 2.25 0.9 0.147 0.27 0.13 0.01 0.14 0.00
28 140 2.33 0.9 0.147 0.27 0.13 0.01 0.14 0.00
29 145 2.42 0.9 0.147 0.27 0.13 0.01 0.14 0.00
30 150 2.50 0.9 0.147 0.27 0.13 0.01 0.14 0.00
31 155 2.58 0.9 0.147 0.27 0.13 0.01 0.14 0.00
32 160 2.67 0.9 0.147 0.27 0.13 0.01 0.14 0.00
33 165 2.75 1.0 0.163 0.27 0.15 0.02 0.15 0.00
34 170 2.83 1.0 0.163 0.27 0.15 0.02 0.15 0.00
35 175 2.92 1.0 0.163 0.27 0.15 0.02 0.15 0.00
36 180 3.00 1.0 0.163 0.27 0.15 0.02 0.15 0.00
37 185 3.08 1.0 0.163 0.27 0.15 0.02 0.15 0.00
38 190 3.17 1.1 0.180 0.27 0.16 0.02 0.17 0.00
39 195 3.25 1.1 0.180 0.27 0.16 0.02 0.17 0.00
40 200 3.33 1.1 0.180 0.27 0.16 0.02 0.17 0.00
41 205 3.42 1.2 0.196 0.27 0.18 0.02 0.19 0.00
42 210 3.50 1.3 0.212 0.27 0.19 0.02 0.20 0.00
43 215 3.58 1.4 0.228 0.27 0.21 0.02 0.22 0.00
44 220 3.67 1.4 0.228 0.27 0.21 0.02 0.22 0.00
45 225 3.75 1.5 0.245 0.27 0.22 0.02 0.23 0.00
46 230 3.83 1.5 0.245 0.27 0.22 0.02 0.23 0.00
47 235 3.92 1.6 0.261 0.27 0.24 0.03 0.25 0.00
48 240 4.00 1.6 0.261 0.27 0.24 0.03 0.25 0.00
49 245 4.08 1.7 0.277 0.27 0.25 0.00 0.04 0.00
50 250 4.17 1.8 0.294 0.27 0.26 0.02 0.20 0.00
51 255 4.25 1.9 0.310 0.27 0.28 0.04 0.35 24.04
52 260 4.33 2.0 0.326 0.27 0.29 0.05 0.51 70.50
53 265 4.42 2.1 0.343 0.27 0.31 0.07 0.66 116.96
54 270 4.50 2.1 0.343 0.27 0.31 0.07 0.66 116.96
55 275 4.58 2.2 0.359 0.27 0.32 0.09 0.82 163.43
56 280 4.67 2.3 0.375 0.27 0.34 0.10 0.97 209.89

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.392 0.27 0.35 0.12 1.13 256.35
58 290 4.83 2.4 0.392 0.27 0.35 0.12 1.13 256.35
59 295 4.92 2.5 0.408 0.27 0.37 0.14 1.28 302.82
60 300 5.00 2.6 0.424 0.27 0.38 0.15 1.44 349.28
61 305 5.08 3.1 0.506 0.27 0.46 0.23 2.21 581.59
62 310 5.17 3.6 0.588 0.27 0.53 0.31 2.99 813.91
63 315 5.25 3.9 0.636 0.27 0.57 0.36 3.45 953.30
64 320 5.33 4.2 0.685 0.27 0.62 0.41 3.92 1092.69
65 325 5.42 4.7 0.767 0.27 0.69 0.49 4.69 1325.00
66 330 5.50 5.6 0.914 0.27 0.82 0.64 6.08 1743.17
67 335 5.58 1.9 0.310 0.27 0.28 0.04 0.35 24.04
68 340 5.67 0.9 0.147 0.27 0.13 0.01 0.14 0.00
69 345 5.75 0.6 0.098 0.27 0.09 0.01 0.09 0.00
70 350 5.83 0.5 0.082 0.27 0.07 0.01 0.08 0.00
71 355 5.92 0.3 0.049 0.27 0.04 0.00 0.05 0.00
72 360 6.00 0.2 0.033 0.27 0.03 0.00 0.03 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.35
FLOOD VOLUME (acft) 0.28
FLOOD VOLUME (cuft) 12149.95
REQUIRED STORAGE (acft) 0.19
REQUIRED STORAGE (cuft) 8400.27
PEAK FLOW RATE (cfs) 6.08
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.490 CONSTANT LOSS RATE-in/hr n/a
UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2729 LAG TIME - MINUTES 2.83 MINIMUM LOSS RATE (for var. loss) - in/hr 0.136 UNIT TIME-PERCENT OF LAG 529.1 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00253
PERCOLATION RATE (cfs) 0.27
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.018 0.482 0.016 0.002 0.02 0.00
2 30 0.50 0.3 0.027 0.476 0.024 0.003 0.03 0.00
3 45 0.75 0.3 0.027 0.471 0.024 0.003 0.03 0.00
4 60 1.00 0.4 0.036 0.465 0.032 0.004 0.03 0.00
5 75 1.25 0.3 0.027 0.460 0.024 0.003 0.03 0.00
6 90 1.50 0.3 0.027 0.454 0.024 0.003 0.03 0.00
7 105 1.75 0.3 0.027 0.449 0.024 0.003 0.03 0.00
8 120 2.00 0.4 0.036 0.443 0.032 0.004 0.03 0.00
9 135 2.25 0.4 0.036 0.438 0.032 0.004 0.03 0.00
10 150 2.50 0.4 0.036 0.433 0.032 0.004 0.03 0.00
11 165 2.75 0.5 0.045 0.427 0.040 0.004 0.04 0.00
12 180 3.00 0.5 0.045 0.422 0.040 0.004 0.04 0.00
13 195 3.25 0.5 0.045 0.417 0.040 0.004 0.04 0.00
14 210 3.50 0.5 0.045 0.412 0.040 0.004 0.04 0.00
15 225 3.75 0.5 0.045 0.407 0.040 0.004 0.04 0.00
16 240 4.00 0.6 0.054 0.401 0.048 0.005 0.05 0.00
17 255 4.25 0.6 0.054 0.396 0.048 0.005 0.05 0.00
18 270 4.50 0.7 0.062 0.391 0.056 0.006 0.06 0.00
19 285 4.75 0.7 0.062 0.386 0.056 0.006 0.06 0.00
20 300 5.00 0.8 0.071 0.381 0.064 0.007 0.07 0.00
21 315 5.25 0.6 0.054 0.376 0.048 0.005 0.05 0.00
22 330 5.50 0.7 0.062 0.371 0.056 0.006 0.06 0.00
23 345 5.75 0.8 0.071 0.367 0.064 0.007 0.07 0.00
24 360 6.00 0.8 0.071 0.362 0.064 0.007 0.07 0.00
25 375 6.25 0.9 0.080 0.357 0.072 0.008 0.08 0.00
26 390 6.50 0.9 0.080 0.352 0.072 0.008 0.08 0.00
27 405 6.75 1.0 0.089 0.347 0.080 0.009 0.08 0.00
28 420 7.00 1.0 0.089 0.343 0.080 0.009 0.08 0.00
29 435 7.25 1.0 0.089 0.338 0.080 0.009 0.08 0.00
30 450 7.50 1.1 0.098 0.334 0.088 0.010 0.09 0.00
31 465 7.75 1.2 0.107 0.329 0.096 0.011 0.10 0.00
32 480 8.00 1.3 0.116 0.324 0.104 0.012 0.11 0.00
33 495 8.25 1.5 0.134 0.320 0.120 0.013 0.13 0.00
34 510 8.50 1.5 0.134 0.315 0.120 0.013 0.13 0.00
35 525 8.75 1.6 0.143 0.311 0.128 0.014 0.14 0.00
36 540 9.00 1.7 0.152 0.307 0.136 0.015 0.14 0.00
37 555 9.25 1.9 0.169 0.302 0.153 0.017 0.16 0.00
38 570 9.50 2.0 0.178 0.298 0.161 0.018 0.17 0.00
39 585 9.75 2.1 0.187 0.294 0.169 0.019 0.18 0.00
40 600 10.00 2.2 0.196 0.290 0.177 0.020 0.19 0.00
41 615 10.25 1.5 0.134 0.285 0.120 0.013 0.13 0.00
42 630 10.50 1.5 0.134 0.281 0.120 0.013 0.13 0.00
43 645 10.75 2.0 0.178 0.277 0.161 0.018 0.17 0.00
44 660 11.00 2.0 0.178 0.273 0.161 0.018 0.17 0.00
45 675 11.25 1.9 0.169 0.269 0.153 0.017 0.16 0.00
46 690 11.50 1.9 0.169 0.265 0.153 0.017 0.16 0.00
47 705 11.75 1.7 0.152 0.261 0.136 0.015 0.14 0.00
48 720 12.00 1.8 0.161 0.257 0.145 0.016 0.15 0.00
49 735 12.25 2.5 0.223 0.253 0.201 0.022 0.21 0.00
50 750 12.50 2.6 0.232 0.250 0.209 0.023 0.22 0.00
51 765 12.75 2.8 0.250 0.246 0.225 0.004 0.04 0.00
52 780 13.00 2.9 0.259 0.242 0.233 0.017 0.16 0.00
53 795 13.25 3.4 0.303 0.239 0.273 0.065 0.61 307.33
54 810 13.50 3.4 0.303 0.235 0.273 0.068 0.65 338.20
55 825 13.75 2.3 0.205 0.231 0.185 0.021 0.19 0.00
56 840 14.00 2.3 0.205 0.228 0.185 0.021 0.19 0.00
57 855 14.25 2.7 0.241 0.224 0.217 0.016 0.16 0.00
58 870 14.50 2.6 0.232 0.221 0.209 0.011 0.10 0.00
59 885 14.75 2.6 0.232 0.218 0.209 0.014 0.14 0.00
60 900 15.00 2.5 0.223 0.214 0.201 0.009 0.08 0.00
61 915 15.25 2.4 0.214 0.211 0.193 0.003 0.03 0.00
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
62 930 15.50 2.3 0.205 0.208 0.185 0.021 0.19 0.00
63 945 15.75 1.9 0.169 0.205 0.153 0.017 0.16 0.00
64 960 16.00 1.9 0.169 0.201 0.153 0.017 0.16 0.00
65 975 16.25 0.4 0.036 0.198 0.032 0.004 0.03 0.00
66 990 16.50 0.4 0.036 0.195 0.032 0.004 0.03 0.00
67 1005 16.75 0.3 0.027 0.192 0.024 0.003 0.03 0.00
68 1020 17.00 0.3 0.027 0.189 0.024 0.003 0.03 0.00
69 1035 17.25 0.5 0.045 0.187 0.040 0.004 0.04 0.00
70 1050 17.50 0.5 0.045 0.184 0.040 0.004 0.04 0.00
71 1065 17.75 0.5 0.045 0.181 0.040 0.004 0.04 0.00
72 1080 18.00 0.4 0.036 0.178 0.032 0.004 0.03 0.00
73 1095 18.25 0.4 0.036 0.176 0.032 0.004 0.03 0.00
74 1110 18.50 0.4 0.036 0.173 0.032 0.004 0.03 0.00
75 1125 18.75 0.3 0.027 0.171 0.024 0.003 0.03 0.00
76 1140 19.00 0.2 0.018 0.168 0.016 0.002 0.02 0.00
77 1155 19.25 0.3 0.027 0.166 0.024 0.003 0.03 0.00
78 1170 19.50 0.4 0.036 0.164 0.032 0.004 0.03 0.00
79 1185 19.75 0.3 0.027 0.161 0.024 0.003 0.03 0.00
80 1200 20.00 0.2 0.018 0.159 0.016 0.002 0.02 0.00
81 1215 20.25 0.3 0.027 0.157 0.024 0.003 0.03 0.00
82 1230 20.50 0.3 0.027 0.155 0.024 0.003 0.03 0.00
83 1245 20.75 0.3 0.027 0.153 0.024 0.003 0.03 0.00
84 1260 21.00 0.2 0.018 0.151 0.016 0.002 0.02 0.00
85 1275 21.25 0.3 0.027 0.149 0.024 0.003 0.03 0.00
86 1290 21.50 0.2 0.018 0.148 0.016 0.002 0.02 0.00
87 1305 21.75 0.3 0.027 0.146 0.024 0.003 0.03 0.00
88 1320 22.00 0.2 0.018 0.145 0.016 0.002 0.02 0.00
89 1335 22.25 0.3 0.027 0.143 0.024 0.003 0.03 0.00
90 1350 22.50 0.2 0.018 0.142 0.016 0.002 0.02 0.00
91 1365 22.75 0.2 0.018 0.141 0.016 0.002 0.02 0.00
92 1380 23.00 0.2 0.018 0.139 0.016 0.002 0.02 0.00
93 1395 23.25 0.2 0.018 0.138 0.016 0.002 0.02 0.00
94 1410 23.50 0.2 0.018 0.138 0.016 0.002 0.02 0.00
95 1425 23.75 0.2 0.018 0.137 0.016 0.002 0.02 0.00
96 1440 24.00 0.2 0.018 0.137 0.016 0.002 0.02 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 0.22
FLOOD VOLUME (acft) 0.17
FLOOD VOLUME (cuft) 7524.21
REQUIRED STORAGE (acft) 0.01
REQUIRED STORAGE (cuft) 645.53
PEAK FLOW (cfs) 0.65
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 10 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

INCR TOTAL INCR TOTAL INCR TOTAL
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
463.5 0 0 17610 0 0 0.00
464.5 1 1 1790 19400 18505 18505 0.42
465.5 1 2 1840 21240 20320 38825 0.89
466.5 1 3 1900 23140 22190 61015 1.40
467 0.5 3.5 970 24110 11813 72828 1.67

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.27 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.27 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.15 46 46 82 - 463.50 - 0.00
2 10 0.15 46 46 82 - 463.50 - 0.00
3 15 0.13 39 39 82 - 463.50 - 0.00
4 20 0.18 53 53 82 - 463.50 - 0.00
5 25 0.18 53 53 82 - 463.50 - 0.00
6 30 0.21 64 64 82 - 463.50 - 0.00
7 35 0.18 53 53 82 - 463.50 - 0.00
8 40 0.21 64 64 82 - 463.50 - 0.00
9 45 0.21 64 64 82 - 463.50 - 0.00
10 50 0.18 53 53 82 - 463.50 - 0.00
11 55 0.19 57 57 82 - 463.50 - 0.00
12 60 0.21 64 64 82 - 463.50 - 0.00
13 65 0.02 5 5 82 - 463.50 - 0.00
14 70 0.02 5 5 82 - 463.50 - 0.00
15 75 0.02 5 5 82 - 463.50 - 0.00
16 80 0.24 71 71 82 - 463.50 - 0.00
17 85 0.49 147 147 82 65 463.50 65 0.00
18 90 0.61 182 248 82 166 463.51 166 0.00
19 95 0.25 76 242 82 160 463.51 160 0.00
20 100 0.61 182 342 82 260 463.51 260 0.01
21 105 1.32 396 656 82 574 463.53 574 0.01
22 110 1.08 325 899 82 817 463.54 817 0.02
23 115 0.85 254 1,070 82 988 463.55 988 0.02
24 120 0.96 289 1,277 82 1,195 463.56 1,195 0.03
25 125 1.08 325 1,520 82 1,438 463.58 1,438 0.03
26 130 2.38 715 2,153 82 2,072 463.61 2,072 0.05
27 135 3.33 1,000 3,071 82 2,989 463.66 2,989 0.07
28 140 1.56 467 3,456 82 3,374 463.68 3,374 0.08
29 145 5.46 1,639 5,013 82 4,931 463.77 4,931 0.11
30 150 6.06 1,817 6,748 82 6,666 463.86 6,666 0.15
31 155 7.12 2,137 8,803 82 8,721 463.97 8,721 0.20
32 160 4.40 1,319 10,041 82 9,959 464.04 9,959 0.23
33 165 0.24 71 10,030 82 9,948 464.04 9,948 0.23
34 170 0.21 64 10,012 82 9,930 464.04 9,930 0.23
35 175 0.21 64 9,994 82 9,912 464.04 9,912 0.23
36 180 0.07 21 9,933 82 9,851 464.03 9,851 0.23

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.08 23 23 82 - 463.50 - 0.00
2 10 0.09 28 28 82 - 463.50 - 0.00
3 15 0.09 28 28 82 - 463.50 - 0.00
4 20 0.09 28 28 82 - 463.50 - 0.00
5 25 0.09 28 28 82 - 463.50 - 0.00
6 30 0.11 33 33 82 - 463.50 - 0.00
7 35 0.11 33 33 82 - 463.50 - 0.00
8 40 0.11 33 33 82 - 463.50 - 0.00
9 45 0.11 33 33 82 - 463.50 - 0.00
10 50 0.11 33 33 82 - 463.50 - 0.00
11 55 0.11 33 33 82 - 463.50 - 0.00
12 60 0.12 37 37 82 - 463.50 - 0.00
13 65 0.12 37 37 82 - 463.50 - 0.00
14 70 0.12 37 37 82 - 463.50 - 0.00
15 75 0.12 37 37 82 - 463.50 - 0.00
16 80 0.12 37 37 82 - 463.50 - 0.00
17 85 0.12 37 37 82 - 463.50 - 0.00
18 90 0.12 37 37 82 - 463.50 - 0.00
19 95 0.12 37 37 82 - 463.50 - 0.00
20 100 0.12 37 37 82 - 463.50 - 0.00
21 105 0.12 37 37 82 - 463.50 - 0.00
22 110 0.12 37 37 82 - 463.50 - 0.00
23 115 0.12 37 37 82 - 463.50 - 0.00
24 120 0.14 42 42 82 - 463.50 - 0.00
25 125 0.12 37 37 82 - 463.50 - 0.00
26 130 0.14 42 42 82 - 463.50 - 0.00
27 135 0.14 42 42 82 - 463.50 - 0.00
28 140 0.14 42 42 82 - 463.50 - 0.00
29 145 0.14 42 42 82 - 463.50 - 0.00
30 150 0.14 42 42 82 - 463.50 - 0.00
31 155 0.14 42 42 82 - 463.50 - 0.00
32 160 0.14 42 42 82 - 463.50 - 0.00
33 165 0.15 46 46 82 - 463.50 - 0.00
34 170 0.15 46 46 82 - 463.50 - 0.00
35 175 0.15 46 46 82 - 463.50 - 0.00
36 180 0.15 46 46 82 - 463.50 - 0.00
37 185 0.15 46 46 82 - 463.50 - 0.00
38 190 0.17 51 51 82 - 463.50 - 0.00
39 195 0.17 51 51 82 - 463.50 - 0.00
40 200 0.17 51 51 82 - 463.50 - 0.00
41 205 0.19 56 56 82 - 463.50 - 0.00
42 210 0.20 60 60 82 - 463.50 - 0.00
43 215 0.22 65 65 82 - 463.50 - 0.00
44 220 0.22 65 65 82 - 463.50 - 0.00
45 225 0.23 70 70 82 - 463.50 - 0.00
46 230 0.23 70 70 82 - 463.50 - 0.00
47 235 0.25 74 74 82 - 463.50 - 0.00
48 240 0.25 74 74 82 - 463.50 - 0.00
49 245 0.04 13 13 82 - 463.50 - 0.00
50 250 0.20 60 60 82 - 463.50 - 0.00
51 255 0.35 106 106 82 24 463.50 24 0.00
52 260 0.51 152 176 82 95 463.51 95 0.00
53 265 0.66 199 293 82 211 463.51 211 0.00
54 270 0.66 199 410 82 328 463.52 328 0.01
55 275 0.82 245 574 82 492 463.53 492 0.01

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 0.97 292 784 82 702 463.54 702 0.02
57 285 1.13 338 1,040 82 958 463.55 958 0.02
58 290 1.13 338 1,296 82 1,214 463.57 1,214 0.03
59 295 1.28 385 1,599 82 1,517 463.58 1,517 0.03
60 300 1.44 431 1,949 82 1,867 463.60 1,867 0.04
61 305 2.21 664 2,530 82 2,448 463.63 2,448 0.06
62 310 2.99 896 3,344 82 3,262 463.68 3,262 0.07
63 315 3.45 1,035 4,297 82 4,215 463.73 4,215 0.10
64 320 3.92 1,175 5,390 82 5,308 463.79 5,308 0.12
65 325 4.69 1,407 6,715 82 6,633 463.86 6,633 0.15
66 330 6.08 1,825 8,458 82 8,376 463.95 8,376 0.19
67 335 0.35 106 8,482 82 8,400 463.95 8,400 0.19
68 340 0.14 42 8,442 82 8,360 463.95 8,360 0.19
69 345 0.09 28 8,388 82 8,306 463.95 8,306 0.19
70 350 0.08 23 8,329 82 8,247 463.95 8,247 0.19
71 355 0.05 14 8,261 82 8,179 463.94 8,179 0.19
72 360 0.03 9 8,189 82 8,107 463.94 8,107 0.19
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.02 15 15 246 - 463.50 - 0.00
2 30 0.03 23 23 246 - 463.50 - 0.00
3 45 0.03 23 23 246 - 463.50 - 0.00
4 60 0.03 30 30 246 - 463.50 - 0.00
5 75 0.03 23 23 246 - 463.50 - 0.00
6 90 0.03 23 23 246 - 463.50 - 0.00
7 105 0.03 23 23 246 - 463.50 - 0.00
8 120 0.03 30 30 246 - 463.50 - 0.00
9 135 0.03 30 30 246 - 463.50 - 0.00
10 150 0.03 30 30 246 - 463.50 - 0.00
11 165 0.04 38 38 246 - 463.50 - 0.00
12 180 0.04 38 38 246 - 463.50 - 0.00
13 195 0.04 38 38 246 - 463.50 - 0.00
14 210 0.04 38 38 246 - 463.50 - 0.00
15 225 0.04 38 38 246 - 463.50 - 0.00
16 240 0.05 46 46 246 - 463.50 - 0.00
17 255 0.05 46 46 246 - 463.50 - 0.00
18 270 0.06 53 53 246 - 463.50 - 0.00
19 285 0.06 53 53 246 - 463.50 - 0.00
20 300 0.07 61 61 246 - 463.50 - 0.00
21 315 0.05 46 46 246 - 463.50 - 0.00
22 330 0.06 53 53 246 - 463.50 - 0.00
23 345 0.07 61 61 246 - 463.50 - 0.00
24 360 0.07 61 61 246 - 463.50 - 0.00
25 375 0.08 69 69 246 - 463.50 - 0.00
26 390 0.08 69 69 246 - 463.50 - 0.00
27 405 0.08 76 76 246 - 463.50 - 0.00
28 420 0.08 76 76 246 - 463.50 - 0.00
29 435 0.08 76 76 246 - 463.50 - 0.00
30 450 0.09 84 84 246 - 463.50 - 0.00
31 465 0.10 91 91 246 - 463.50 - 0.00
32 480 0.11 99 99 246 - 463.50 - 0.00
33 495 0.13 114 114 246 - 463.50 - 0.00
34 510 0.13 114 114 246 - 463.50 - 0.00
35 525 0.14 122 122 246 - 463.50 - 0.00
36 540 0.14 130 130 246 - 463.50 - 0.00
37 555 0.16 145 145 246 - 463.50 - 0.00
38 570 0.17 152 152 246 - 463.50 - 0.00
39 585 0.18 160 160 246 - 463.50 - 0.00
40 600 0.19 168 168 246 - 463.50 - 0.00
41 615 0.13 114 114 246 - 463.50 - 0.00
42 630 0.13 114 114 246 - 463.50 - 0.00
43 645 0.17 152 152 246 - 463.50 - 0.00
44 660 0.17 152 152 246 - 463.50 - 0.00
45 675 0.16 145 145 246 - 463.50 - 0.00
46 690 0.16 145 145 246 - 463.50 - 0.00
47 705 0.14 130 130 246 - 463.50 - 0.00
48 720 0.15 137 137 246 - 463.50 - 0.00
49 735 0.21 190 190 246 - 463.50 - 0.00
50 750 0.22 198 198 246 - 463.50 - 0.00
51 765 0.04 33 33 246 - 463.50 - 0.00
52 780 0.16 141 141 246 - 463.50 - 0.00
53 795 0.61 553 553 246 307 463.52 307 0.01
54 810 0.65 584 891 246 646 463.53 646 0.01
55 825 0.19 175 821 246 575 463.53 575 0.01
56 840 0.19 175 750 246 504 463.53 504 0.01
57 855 0.16 141 645 246 399 463.52 399 0.01
58 870 0.10 94 493 246 248 463.51 248 0.01

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.14 123 371 246 125 463.51 125 0.00
60 900 0.08 75 200 246 - 463.50 - 0.00
61 915 0.03 27 27 246 - 463.50 - 0.00
62 930 0.19 175 175 246 - 463.50 - 0.00
63 945 0.16 145 145 246 - 463.50 - 0.00
64 960 0.16 145 145 246 - 463.50 - 0.00
65 975 0.03 30 30 246 - 463.50 - 0.00
66 990 0.03 30 30 246 - 463.50 - 0.00
67 1005 0.03 23 23 246 - 463.50 - 0.00
68 1020 0.03 23 23 246 - 463.50 - 0.00
69 1035 0.04 38 38 246 - 463.50 - 0.00
70 1050 0.04 38 38 246 - 463.50 - 0.00
71 1065 0.04 38 38 246 - 463.50 - 0.00
72 1080 0.03 30 30 246 - 463.50 - 0.00
73 1095 0.03 30 30 246 - 463.50 - 0.00
74 1110 0.03 30 30 246 - 463.50 - 0.00
75 1125 0.03 23 23 246 - 463.50 - 0.00
76 1140 0.02 15 15 246 - 463.50 - 0.00
77 1155 0.03 23 23 246 - 463.50 - 0.00
78 1170 0.03 30 30 246 - 463.50 - 0.00
79 1185 0.03 23 23 246 - 463.50 - 0.00
80 1200 0.02 15 15 246 - 463.50 - 0.00
81 1215 0.03 23 23 246 - 463.50 - 0.00
82 1230 0.03 23 23 246 - 463.50 - 0.00
83 1245 0.03 23 23 246 - 463.50 - 0.00
84 1260 0.02 15 15 246 - 463.50 - 0.00
85 1275 0.03 23 23 246 - 463.50 - 0.00
86 1290 0.02 15 15 246 - 463.50 - 0.00
87 1305 0.03 23 23 246 - 463.50 - 0.00
88 1320 0.02 15 15 246 - 463.50 - 0.00
89 1335 0.03 23 23 246 - 463.50 - 0.00
90 1350 0.02 15 15 246 - 463.50 - 0.00
91 1365 0.02 15 15 246 - 463.50 - 0.00
92 1380 0.02 15 15 246 - 463.50 - 0.00
93 1395 0.02 15 15 246 - 463.50 - 0.00
94 1410 0.02 15 15 246 - 463.50 - 0.00
95 1425 0.02 15 15 246 - 463.50 - 0.00
96 1440 0.02 15 15 246 - 463.50 - 0.00
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 1

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 1.18
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE

MF - CONDOMINIUMS

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 0.83

RETENTION BASIN

GOLF COURSE

MOUNTAINOUS
LOW LOSS RATE (PERCENT) 90%
LENGTH OF WATERCOURSE (L) 1000
LENGTH TO POINT OPPOSITE CENTROID (Lca) 15
ELEVATION OF HEADWATER 471.5
ELEVATION OF CONCENTRATION POINT 468.8
AVERAGE MANNINGS 'N' VALUE 0.02
STORM FREQUENCY (YEAR) 100

POINT RAIN
3-HOUR 2.12
6-HOUR 2.78
24-HOUR 4.47
BASIN CHARACTERISTICS: ELEVATION AREA
465 3025
466 3700
467 4430
468 5215
468.5 5630
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 1008 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT BASIC DATA CALCULATION FORM JOB # 0
SHORTCUT METHOD BY ES R. BAZUA, P.E. DATE 1/17/2025
[1] SOURCE
[2] FREQUENCY-YEARS 100
[3] DURATION:
[4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

2.12 2.010 1.00 2.12 2.78 2.010 1.00 2.78 4.47 2.010 1.00 4.47

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 2.01 SUM [7] 2.12 SUM [9] 2.01 SUM [11] 2.78 SUM [13] 2.01 SUM [15] 4.47 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 2.12 2.78 4.47
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 1.39 1.40 1.43
FLOOD VOLUME (cu-ft) 10,165 10,196 10,445
(acre-ft) 0.23 0.23 0.24
REQUIRED STORAGE (cu-ft) 9,580 9,148 8,100
(acre-ft) 0.22 0.21 0.19
PEAK FLOW (cfs) 3.70 3.26 0.80
MAXIMUM WSEL (ft) 467.45 467.36 467.13

0.189

15.00 0.000
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 2.7
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 1

2.010
1000

0.003
471.5
468.8

0.02 1.0

1.0 2.0

14.3 3.78

0.05 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 100 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

0.00 0.000 0.0000

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 2.01
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.00
UNIT TIME-PERCENT OF LAG 502.5
TOTAL ADJUSTED STORM RAIN-INCHES 2.12
CONSTANT LOSS RATE-in/hr 0.25
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.05 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.331 0.25 0.30 0.09 0.17 37.46
2 10 0.17 1.3 0.331 0.25 0.30 0.09 0.17 37.46
3 15 0.25 1.1 0.280 0.25 0.25 0.03 0.07 6.78
4 20 0.33 1.5 0.382 0.25 0.34 0.14 0.27 68.14
5 25 0.42 1.5 0.382 0.25 0.34 0.14 0.27 68.14
6 30 0.50 1.8 0.458 0.25 0.41 0.21 0.43 114.16
7 35 0.58 1.5 0.382 0.25 0.34 0.14 0.27 68.14
8 40 0.67 1.8 0.458 0.25 0.41 0.21 0.43 114.16
9 45 0.75 1.8 0.458 0.25 0.41 0.21 0.43 114.16
10 50 0.83 1.5 0.382 0.25 0.34 0.14 0.27 68.14
11 55 0.92 1.6 0.407 0.25 0.37 0.16 0.33 83.48
12 60 1.00 1.8 0.458 0.25 0.41 0.21 0.43 114.16
13 65 1.08 2.2 0.560 0.25 0.50 0.31 0.63 175.52
14 70 1.17 2.2 0.560 0.25 0.50 0.31 0.63 175.52
15 75 1.25 2.2 0.560 0.25 0.50 0.31 0.63 175.52
16 80 1.33 2.0 0.509 0.25 0.46 0.26 0.53 144.84
17 85 1.42 2.6 0.661 0.25 0.60 0.42 0.84 236.89
18 90 1.50 2.7 0.687 0.25 0.62 0.44 0.89 252.23
19 95 1.58 2.4 0.611 0.25 0.55 0.37 0.73 206.21
20 100 1.67 2.7 0.687 0.25 0.62 0.44 0.89 252.23
21 105 1.75 3.3 0.840 0.25 0.76 0.59 1.19 344.27
22 110 1.83 3.1 0.789 0.25 0.71 0.54 1.09 313.59
23 115 1.92 2.9 0.738 0.25 0.66 0.49 0.99 282.91
24 120 2.00 3.0 0.763 0.25 0.69 0.52 1.04 298.25
25 125 2.08 3.1 0.789 0.25 0.71 0.54 1.09 313.59
26 130 2.17 4.2 1.068 0.25 0.96 0.82 1.65 482.33
27 135 2.25 5.0 1.272 0.25 1.14 1.03 2.06 605.05
28 140 2.33 3.5 0.890 0.25 0.80 0.65 1.30 374.95
29 145 2.42 6.8 1.730 0.25 1.56 1.48 2.98 881.18
30 150 2.50 7.3 1.857 0.25 1.67 1.61 3.24 957.88
31 155 2.58 8.2 2.086 0.25 1.88 1.84 3.70 1095.94
32 160 2.67 5.9 1.501 0.25 1.35 1.26 2.52 743.12
33 165 2.75 2.0 0.509 0.25 0.46 0.26 0.53 144.84
34 170 2.83 1.8 0.458 0.25 0.41 0.21 0.43 114.16
35 175 2.92 1.8 0.458 0.25 0.41 0.21 0.43 114.16
36 180 3.00 0.6 0.153 0.25 0.14 0.02 0.03 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.39
FLOOD VOLUME (acft) 0.23
FLOOD VOLUME (cuft) 10165.45
REQUIRED STORAGE (acft) 0.22
REQUIRED STORAGE (cuft) 9579.59
PEAK FLOW RATE (cfs) 3.70
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 2.01
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.00
UNIT TIME-PERCENT OF LAG 502.5
TOTAL ADJUSTED STORM RAIN-INCHES 2.78
CONSTANT LOSS RATE-in/hr 0.245
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.05 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.167 0.25 0.15 0.02 0.03 0.00
2 10 0.17 0.6 0.200 0.25 0.18 0.02 0.04 0.00
3 15 0.25 0.6 0.200 0.25 0.18 0.02 0.04 0.00
4 20 0.33 0.6 0.200 0.25 0.18 0.02 0.04 0.00
5 25 0.42 0.6 0.200 0.25 0.18 0.02 0.04 0.00
6 30 0.50 0.7 0.234 0.25 0.21 0.02 0.05 0.01
7 35 0.58 0.7 0.234 0.25 0.21 0.02 0.05 0.01
8 40 0.67 0.7 0.234 0.25 0.21 0.02 0.05 0.01
9 45 0.75 0.7 0.234 0.25 0.21 0.02 0.05 0.01
10 50 0.83 0.7 0.234 0.25 0.21 0.02 0.05 0.01
11 55 0.92 0.7 0.234 0.25 0.21 0.02 0.05 0.01
12 60 1.00 0.8 0.267 0.25 0.24 0.02 0.04 0.00
13 65 1.08 0.8 0.267 0.25 0.24 0.02 0.04 0.00
14 70 1.17 0.8 0.267 0.25 0.24 0.02 0.04 0.00
15 75 1.25 0.8 0.267 0.25 0.24 0.02 0.04 0.00
16 80 1.33 0.8 0.267 0.25 0.24 0.02 0.04 0.00
17 85 1.42 0.8 0.267 0.25 0.24 0.02 0.04 0.00
18 90 1.50 0.8 0.267 0.25 0.24 0.02 0.04 0.00
19 95 1.58 0.8 0.267 0.25 0.24 0.02 0.04 0.00
20 100 1.67 0.8 0.267 0.25 0.24 0.02 0.04 0.00
21 105 1.75 0.8 0.267 0.25 0.24 0.02 0.04 0.00
22 110 1.83 0.8 0.267 0.25 0.24 0.02 0.04 0.00
23 115 1.92 0.8 0.267 0.25 0.24 0.02 0.04 0.00
24 120 2.00 0.9 0.300 0.25 0.27 0.05 0.11 19.08
25 125 2.08 0.8 0.267 0.25 0.24 0.02 0.04 0.00
26 130 2.17 0.9 0.300 0.25 0.27 0.05 0.11 19.08
27 135 2.25 0.9 0.300 0.25 0.27 0.05 0.11 19.08
28 140 2.33 0.9 0.300 0.25 0.27 0.05 0.11 19.08
29 145 2.42 0.9 0.300 0.25 0.27 0.05 0.11 19.08
30 150 2.50 0.9 0.300 0.25 0.27 0.05 0.11 19.08
31 155 2.58 0.9 0.300 0.25 0.27 0.05 0.11 19.08
32 160 2.67 0.9 0.300 0.25 0.27 0.05 0.11 19.08
33 165 2.75 1.0 0.334 0.25 0.30 0.09 0.18 39.20
34 170 2.83 1.0 0.334 0.25 0.30 0.09 0.18 39.20
35 175 2.92 1.0 0.334 0.25 0.30 0.09 0.18 39.20
36 180 3.00 1.0 0.334 0.25 0.30 0.09 0.18 39.20
37 185 3.08 1.0 0.334 0.25 0.30 0.09 0.18 39.20
38 190 3.17 1.1 0.367 0.25 0.33 0.12 0.24 59.31
39 195 3.25 1.1 0.367 0.25 0.33 0.12 0.24 59.31
40 200 3.33 1.1 0.367 0.25 0.33 0.12 0.24 59.31
41 205 3.42 1.2 0.400 0.25 0.36 0.16 0.31 79.43
42 210 3.50 1.3 0.434 0.25 0.39 0.19 0.38 99.55
43 215 3.58 1.4 0.467 0.25 0.42 0.22 0.45 119.66
44 220 3.67 1.4 0.467 0.25 0.42 0.22 0.45 119.66
45 225 3.75 1.5 0.500 0.25 0.45 0.26 0.51 139.78
46 230 3.83 1.5 0.500 0.25 0.45 0.26 0.51 139.78
47 235 3.92 1.6 0.534 0.25 0.48 0.29 0.58 159.89
48 240 4.00 1.6 0.534 0.25 0.48 0.29 0.58 159.89
49 245 4.08 1.7 0.567 0.25 0.51 0.32 0.65 180.01
50 250 4.17 1.8 0.600 0.25 0.54 0.36 0.71 200.13
51 255 4.25 1.9 0.634 0.25 0.57 0.39 0.78 220.24
52 260 4.33 2.0 0.667 0.25 0.60 0.42 0.85 240.36
53 265 4.42 2.1 0.701 0.25 0.63 0.46 0.92 260.48
54 270 4.50 2.1 0.701 0.25 0.63 0.46 0.92 260.48
55 275 4.58 2.2 0.734 0.25 0.66 0.49 0.98 280.59
56 280 4.67 2.3 0.767 0.25 0.69 0.52 1.05 300.71

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.801 0.25 0.72 0.56 1.12 320.82
58 290 4.83 2.4 0.801 0.25 0.72 0.56 1.12 320.82
59 295 4.92 2.5 0.834 0.25 0.75 0.59 1.18 340.94
60 300 5.00 2.6 0.867 0.25 0.78 0.62 1.25 361.06
61 305 5.08 3.1 1.034 0.25 0.93 0.79 1.59 461.64
62 310 5.17 3.6 1.201 0.25 1.08 0.96 1.92 562.22
63 315 5.25 3.9 1.301 0.25 1.17 1.06 2.12 622.56
64 320 5.33 4.2 1.401 0.25 1.26 1.16 2.32 682.91
65 325 5.42 4.7 1.568 0.25 1.41 1.32 2.66 783.49
66 330 5.50 5.6 1.868 0.25 1.68 1.62 3.26 964.54
67 335 5.58 1.9 0.634 0.25 0.57 0.39 0.78 220.24
68 340 5.67 0.9 0.300 0.25 0.27 0.05 0.11 19.08
69 345 5.75 0.6 0.200 0.25 0.18 0.02 0.04 0.00
70 350 5.83 0.5 0.167 0.25 0.15 0.02 0.03 0.00
71 355 5.92 0.3 0.100 0.25 0.09 0.01 0.02 0.00
72 360 6.00 0.2 0.067 0.25 0.06 0.01 0.01 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.40
FLOOD VOLUME (acft) 0.23
FLOOD VOLUME (cuft) 10195.68
REQUIRED STORAGE (acft) 0.21
REQUIRED STORAGE (cuft) 9147.59
PEAK FLOW RATE (cfs) 3.26
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 2.010 CONSTANT LOSS RATE-in/hr n/a
UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2453 LAG TIME - MINUTES 1.00 MINIMUM LOSS RATE (for var. loss) - in/hr 0.123 UNIT TIME-PERCENT OF LAG 1507.5 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 4.47 C 0.00227
PERCOLATION RATE (cfs) 0.05
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.036 0.433 0.032 0.004 0.01 0.00
2 30 0.50 0.3 0.054 0.428 0.048 0.005 0.01 0.00
3 45 0.75 0.3 0.054 0.423 0.048 0.005 0.01 0.00
4 60 1.00 0.4 0.072 0.418 0.064 0.007 0.01 0.00
5 75 1.25 0.3 0.054 0.413 0.048 0.005 0.01 0.00
6 90 1.50 0.3 0.054 0.408 0.048 0.005 0.01 0.00
7 105 1.75 0.3 0.054 0.403 0.048 0.005 0.01 0.00
8 120 2.00 0.4 0.072 0.399 0.064 0.007 0.01 0.00
9 135 2.25 0.4 0.072 0.394 0.064 0.007 0.01 0.00
10 150 2.50 0.4 0.072 0.389 0.064 0.007 0.01 0.00
11 165 2.75 0.5 0.089 0.384 0.080 0.009 0.02 0.00
12 180 3.00 0.5 0.089 0.379 0.080 0.009 0.02 0.00
13 195 3.25 0.5 0.089 0.375 0.080 0.009 0.02 0.00
14 210 3.50 0.5 0.089 0.370 0.080 0.009 0.02 0.00
15 225 3.75 0.5 0.089 0.365 0.080 0.009 0.02 0.00
16 240 4.00 0.6 0.107 0.361 0.097 0.011 0.02 0.00
17 255 4.25 0.6 0.107 0.356 0.097 0.011 0.02 0.00
18 270 4.50 0.7 0.125 0.352 0.113 0.013 0.03 0.00
19 285 4.75 0.7 0.125 0.347 0.113 0.013 0.03 0.00
20 300 5.00 0.8 0.143 0.343 0.129 0.014 0.03 0.00
21 315 5.25 0.6 0.107 0.338 0.097 0.011 0.02 0.00
22 330 5.50 0.7 0.125 0.334 0.113 0.013 0.03 0.00
23 345 5.75 0.8 0.143 0.330 0.129 0.014 0.03 0.00
24 360 6.00 0.8 0.143 0.325 0.129 0.014 0.03 0.00
25 375 6.25 0.9 0.161 0.321 0.145 0.016 0.03 0.00
26 390 6.50 0.9 0.161 0.317 0.145 0.016 0.03 0.00
27 405 6.75 1.0 0.179 0.312 0.161 0.018 0.04 0.00
28 420 7.00 1.0 0.179 0.308 0.161 0.018 0.04 0.00
29 435 7.25 1.0 0.179 0.304 0.161 0.018 0.04 0.00
30 450 7.50 1.1 0.197 0.300 0.177 0.020 0.04 0.00
31 465 7.75 1.2 0.215 0.296 0.193 0.021 0.04 0.00
32 480 8.00 1.3 0.232 0.292 0.209 0.023 0.05 0.00
33 495 8.25 1.5 0.268 0.288 0.241 0.027 0.05 6.29
34 510 8.50 1.5 0.268 0.284 0.241 0.027 0.05 6.29
35 525 8.75 1.6 0.286 0.280 0.257 0.007 0.01 0.00
36 540 9.00 1.7 0.304 0.276 0.274 0.028 0.06 9.01
37 555 9.25 1.9 0.340 0.272 0.306 0.068 0.14 80.76
38 570 9.50 2.0 0.358 0.268 0.322 0.090 0.18 120.10
39 585 9.75 2.1 0.375 0.264 0.338 0.111 0.22 159.37
40 600 10.00 2.2 0.393 0.260 0.354 0.133 0.27 198.58
41 615 10.25 1.5 0.268 0.256 0.241 0.012 0.02 0.00
42 630 10.50 1.5 0.268 0.253 0.241 0.015 0.03 0.00
43 645 10.75 2.0 0.358 0.249 0.322 0.109 0.22 154.08
44 660 11.00 2.0 0.358 0.245 0.322 0.112 0.23 160.67
45 675 11.25 1.9 0.340 0.242 0.306 0.098 0.20 134.85
46 690 11.50 1.9 0.340 0.238 0.306 0.101 0.20 141.31
47 705 11.75 1.7 0.304 0.235 0.274 0.069 0.14 83.00
48 720 12.00 1.8 0.322 0.231 0.290 0.091 0.18 121.66
49 735 12.25 2.5 0.447 0.228 0.402 0.219 0.44 354.32
50 750 12.50 2.6 0.465 0.224 0.418 0.240 0.48 392.84
51 765 12.75 2.8 0.501 0.221 0.451 0.280 0.56 463.63
52 780 13.00 2.9 0.519 0.218 0.467 0.301 0.60 502.00
53 795 13.25 3.4 0.608 0.214 0.547 0.394 0.79 669.68
54 810 13.50 3.4 0.608 0.211 0.547 0.397 0.80 675.55
55 825 13.75 2.3 0.411 0.208 0.370 0.203 0.41 325.56
56 840 14.00 2.3 0.411 0.205 0.370 0.206 0.42 331.29
57 855 14.25 2.7 0.483 0.202 0.434 0.281 0.57 466.31
58 870 14.50 2.6 0.465 0.199 0.418 0.266 0.54 439.54
59 885 14.75 2.6 0.465 0.196 0.418 0.269 0.54 445.03
60 900 15.00 2.5 0.447 0.193 0.402 0.254 0.51 418.10
61 915 15.25 2.4 0.429 0.190 0.386 0.240 0.48 391.08
62 930 15.50 2.3 0.411 0.187 0.370 0.225 0.45 363.98
63 945 15.75 1.9 0.340 0.184 0.306 0.156 0.31 239.77
64 960 16.00 1.9 0.340 0.181 0.306 0.159 0.32 244.85
65 975 16.25 0.4 0.072 0.178 0.064 0.007 0.01 0.00
66 990 16.50 0.4 0.072 0.176 0.064 0.007 0.01 0.00
67 1005 16.75 0.3 0.054 0.173 0.048 0.005 0.01 0.00
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
68 1020 17.00 0.3 0.054 0.170 0.048 0.005 0.01 0.00
69 1035 17.25 0.5 0.089 0.168 0.080 0.009 0.02 0.00
70 1050 17.50 0.5 0.089 0.165 0.080 0.009 0.02 0.00
71 1065 17.75 0.5 0.089 0.163 0.080 0.009 0.02 0.00
72 1080 18.00 0.4 0.072 0.160 0.064 0.007 0.01 0.00
73 1095 18.25 0.4 0.072 0.158 0.064 0.007 0.01 0.00
74 1110 18.50 0.4 0.072 0.156 0.064 0.007 0.01 0.00
75 1125 18.75 0.3 0.054 0.153 0.048 0.005 0.01 0.00
76 1140 19.00 0.2 0.036 0.151 0.032 0.004 0.01 0.00
77 1155 19.25 0.3 0.054 0.149 0.048 0.005 0.01 0.00
78 1170 19.50 0.4 0.072 0.147 0.064 0.007 0.01 0.00
79 1185 19.75 0.3 0.054 0.145 0.048 0.005 0.01 0.00
80 1200 20.00 0.2 0.036 0.143 0.032 0.004 0.01 0.00
81 1215 20.25 0.3 0.054 0.141 0.048 0.005 0.01 0.00
82 1230 20.50 0.3 0.054 0.139 0.048 0.005 0.01 0.00
83 1245 20.75 0.3 0.054 0.138 0.048 0.005 0.01 0.00
84 1260 21.00 0.2 0.036 0.136 0.032 0.004 0.01 0.00
85 1275 21.25 0.3 0.054 0.134 0.048 0.005 0.01 0.00
86 1290 21.50 0.2 0.036 0.133 0.032 0.004 0.01 0.00
87 1305 21.75 0.3 0.054 0.131 0.048 0.005 0.01 0.00
88 1320 22.00 0.2 0.036 0.130 0.032 0.004 0.01 0.00
89 1335 22.25 0.3 0.054 0.129 0.048 0.005 0.01 0.00
90 1350 22.50 0.2 0.036 0.127 0.032 0.004 0.01 0.00
91 1365 22.75 0.2 0.036 0.126 0.032 0.004 0.01 0.00
92 1380 23.00 0.2 0.036 0.125 0.032 0.004 0.01 0.00
93 1395 23.25 0.2 0.036 0.124 0.032 0.004 0.01 0.00
94 1410 23.50 0.2 0.036 0.124 0.032 0.004 0.01 0.00
95 1425 23.75 0.2 0.036 0.123 0.032 0.004 0.01 0.00
96 1440 24.00 0.2 0.036 0.123 0.032 0.004 0.01 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.43
FLOOD VOLUME (acft) 0.24
FLOOD VOLUME (cuft) 10444.84
REQUIRED STORAGE (acft) 0.19
REQUIRED STORAGE (cuft) 8099.53
PEAK FLOW (cfs) 0.80
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.05 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.05 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.17 52 52 14 37 465.01 37 0.00
2 10 0.17 52 89 14 75 465.02 75 0.00
3 15 0.07 21 96 14 82 465.02 82 0.00
4 20 0.27 82 164 14 150 465.04 150 0.00
5 25 0.27 82 232 14 218 465.06 218 0.01
6 30 0.43 128 346 14 332 465.10 332 0.01
7 35 0.27 82 414 14 400 465.12 400 0.01
8 40 0.43 128 529 14 514 465.15 514 0.01
9 45 0.43 128 643 14 629 465.19 629 0.01
10 50 0.27 82 711 14 697 465.21 697 0.02
11 55 0.33 98 794 14 780 465.23 780 0.02
12 60 0.43 128 908 14 894 465.27 894 0.02
13 65 0.63 190 1,084 14 1,070 465.32 1,070 0.02
14 70 0.63 190 1,260 14 1,245 465.37 1,245 0.03
15 75 0.63 190 1,435 14 1,421 465.42 1,421 0.03
16 80 0.53 159 1,580 14 1,566 465.47 1,566 0.04
17 85 0.84 251 1,817 14 1,803 465.54 1,803 0.04
18 90 0.89 266 2,069 14 2,055 465.61 2,055 0.05
19 95 0.73 220 2,275 14 2,261 465.67 2,261 0.05
20 100 0.89 266 2,527 14 2,513 465.75 2,513 0.06
21 105 1.19 358 2,872 14 2,858 465.85 2,858 0.07
22 110 1.09 328 3,185 14 3,171 465.94 3,171 0.07
23 115 0.99 297 3,468 14 3,454 466.02 3,454 0.08
24 120 1.04 312 3,766 14 3,752 466.10 3,752 0.09
25 125 1.09 328 4,080 14 4,066 466.17 4,066 0.09
26 130 1.65 496 4,562 14 4,548 466.29 4,548 0.10
27 135 2.06 619 5,167 14 5,153 466.44 5,153 0.12
28 140 1.30 389 5,542 14 5,528 466.53 5,528 0.13
29 145 2.98 895 6,424 14 6,409 466.75 6,409 0.15
30 150 3.24 972 7,381 14 7,367 466.99 7,367 0.17
31 155 3.70 1,110 8,477 14 8,463 467.21 8,463 0.19
32 160 2.52 757 9,220 14 9,206 467.37 9,206 0.21
33 165 0.53 159 9,365 14 9,351 467.40 9,351 0.21
34 170 0.43 128 9,479 14 9,465 467.42 9,465 0.22
35 175 0.43 128 9,594 14 9,580 467.45 9,580 0.22
36 180 0.03 9 9,589 14 9,575 467.45 9,575 0.22

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.03 10 10 14 - 465.00 - 0.00
2 10 0.04 12 12 14 - 465.00 - 0.00
3 15 0.04 12 12 14 - 465.00 - 0.00
4 20 0.04 12 12 14 - 465.00 - 0.00
5 25 0.04 12 12 14 - 465.00 - 0.00
6 30 0.05 14 14 14 0 465.00 0.00 0
7 35 0.05 14 14 14 0 465.00 0.00 0
8 40 0.05 14 14 14 0 465.00 0.00 0
9 45 0.05 14 14 14 0 465.00 0.00 0
10 50 0.05 14 14 14 0 465.00 0.00 0
11 55 0.05 14 14 14 0 465.00 0.00 0
12 60 0.04 13 13 14 - 465.00 - 0.00
13 65 0.04 13 13 14 - 465.00 - 0.00
14 70 0.04 13 13 14 - 465.00 - 0.00
15 75 0.04 13 13 14 - 465.00 - 0.00
16 80 0.04 13 13 14 - 465.00 - 0.00
17 85 0.04 13 13 14 - 465.00 - 0.00
18 90 0.04 13 13 14 - 465.00 - 0.00
19 95 0.04 13 13 14 - 465.00 - 0.00
20 100 0.04 13 13 14 - 465.00 - 0.00
21 105 0.04 13 13 14 - 465.00 - 0.00
22 110 0.04 13 13 14 - 465.00 - 0.00
23 115 0.04 13 13 14 - 465.00 - 0.00
24 120 0.11 33 33 14 19 465.01 19 0.00
25 125 0.04 13 32 14 18 465.01 18 0.00
26 130 0.11 33 51 14 37 465.01 37 0.00
27 135 0.11 33 70 14 56 465.02 56 0.00
28 140 0.11 33 89 14 75 465.02 75 0.00
29 145 0.11 33 108 14 94 465.03 94 0.00
30 150 0.11 33 128 14 113 465.03 113 0.00
31 155 0.11 33 147 14 133 465.04 133 0.00
32 160 0.11 33 166 14 152 465.05 152 0.00
33 165 0.18 53 205 14 191 465.06 191 0.00
34 170 0.18 53 244 14 230 465.07 230 0.01
35 175 0.18 53 283 14 269 465.08 269 0.01
36 180 0.18 53 322 14 308 465.09 308 0.01
37 185 0.18 53 362 14 348 465.10 348 0.01
38 190 0.24 73 421 14 407 465.12 407 0.01
39 195 0.24 73 480 14 466 465.14 466 0.01
40 200 0.24 73 540 14 526 465.16 526 0.01
41 205 0.31 94 619 14 605 465.18 605 0.01
42 210 0.38 114 719 14 705 465.21 705 0.02
43 215 0.45 134 838 14 824 465.25 824 0.02
44 220 0.45 134 958 14 944 465.28 944 0.02
45 225 0.51 154 1,098 14 1,084 465.32 1,084 0.02
46 230 0.51 154 1,237 14 1,223 465.36 1,223 0.03
47 235 0.58 174 1,397 14 1,383 465.41 1,383 0.03
48 240 0.58 174 1,557 14 1,543 465.46 1,543 0.04
49 245 0.65 194 1,737 14 1,723 465.51 1,723 0.04
50 250 0.71 214 1,937 14 1,923 465.57 1,923 0.04
51 255 0.78 234 2,158 14 2,144 465.64 2,144 0.05
52 260 0.85 254 2,398 14 2,384 465.71 2,384 0.05
53 265 0.92 275 2,658 14 2,644 465.79 2,644 0.06
54 270 0.92 275 2,919 14 2,905 465.86 2,905 0.07
55 275 0.98 295 3,200 14 3,185 465.95 3,185 0.07

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 1.05 315 3,500 14 3,486 466.03 3,486 0.08
57 285 1.12 335 3,821 14 3,807 466.11 3,807 0.09
58 290 1.12 335 4,142 14 4,128 466.19 4,128 0.09
59 295 1.18 355 4,483 14 4,469 466.27 4,469 0.10
60 300 1.25 375 4,844 14 4,830 466.36 4,830 0.11
61 305 1.59 476 5,306 14 5,291 466.47 5,291 0.12
62 310 1.92 576 5,868 14 5,854 466.61 5,854 0.13
63 315 2.12 637 6,490 14 6,476 466.77 6,476 0.15
64 320 2.32 697 7,173 14 7,159 466.93 7,159 0.16
65 325 2.66 798 7,957 14 7,943 467.11 7,943 0.18
66 330 3.26 979 8,921 14 8,907 467.31 8,907 0.20
67 335 0.78 234 9,142 14 9,127 467.35 9,127 0.21
68 340 0.11 33 9,161 14 9,147 467.36 9,147 0.21
69 345 0.04 12 9,159 14 9,145 467.36 9,145 0.21
70 350 0.03 10 9,155 14 9,140 467.36 9,140 0.21
71 355 0.02 6 9,147 14 9,132 467.35 9,132 0.21
72 360 0.01 4 9,136 14 9,122 467.35 9,122 0.21
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.01 6 6 42 - 465.00 - 0.00
2 30 0.01 10 10 42 - 465.00 - 0.00
3 45 0.01 10 10 42 - 465.00 - 0.00
4 60 0.01 13 13 42 - 465.00 - 0.00
5 75 0.01 10 10 42 - 465.00 - 0.00
6 90 0.01 10 10 42 - 465.00 - 0.00
7 105 0.01 10 10 42 - 465.00 - 0.00
8 120 0.01 13 13 42 - 465.00 - 0.00
9 135 0.01 13 13 42 - 465.00 - 0.00
10 150 0.01 13 13 42 - 465.00 - 0.00
11 165 0.02 16 16 42 - 465.00 - 0.00
12 180 0.02 16 16 42 - 465.00 - 0.00
13 195 0.02 16 16 42 - 465.00 - 0.00
14 210 0.02 16 16 42 - 465.00 - 0.00
15 225 0.02 16 16 42 - 465.00 - 0.00
16 240 0.02 19 19 42 - 465.00 - 0.00
17 255 0.02 19 19 42 - 465.00 - 0.00
18 270 0.03 23 23 42 - 465.00 - 0.00
19 285 0.03 23 23 42 - 465.00 - 0.00
20 300 0.03 26 26 42 - 465.00 - 0.00
21 315 0.02 19 19 42 - 465.00 - 0.00
22 330 0.03 23 23 42 - 465.00 - 0.00
23 345 0.03 26 26 42 - 465.00 - 0.00
24 360 0.03 26 26 42 - 465.00 - 0.00
25 375 0.03 29 29 42 - 465.00 - 0.00
26 390 0.03 29 29 42 - 465.00 - 0.00
27 405 0.04 32 32 42 - 465.00 - 0.00
28 420 0.04 32 32 42 - 465.00 - 0.00
29 435 0.04 32 32 42 - 465.00 - 0.00
30 450 0.04 36 36 42 - 465.00 - 0.00
31 465 0.04 39 39 42 - 465.00 - 0.00
32 480 0.05 42 42 42 - 465.00 - 0.00
33 495 0.05 49 49 42 6 465.00 6 0.00
34 510 0.05 49 55 42 13 465.00 13 0.00
35 525 0.01 12 24 42 - 465.00 - 0.00
36 540 0.06 51 51 42 9 465.00 9 0.00
37 555 0.14 123 132 42 90 465.03 90 0.00
38 570 0.18 162 252 42 210 465.06 210 0.00
39 585 0.22 202 411 42 369 465.11 369 0.01
40 600 0.27 241 610 42 568 465.17 568 0.01
41 615 0.02 21 589 42 547 465.16 547 0.01
42 630 0.03 28 575 42 532 465.16 532 0.01
43 645 0.22 196 729 42 687 465.20 687 0.02
44 660 0.23 203 889 42 847 465.25 847 0.02
45 675 0.20 177 1,024 42 982 465.29 982 0.02
46 690 0.20 184 1,166 42 1,123 465.33 1,123 0.03
47 705 0.14 125 1,249 42 1,206 465.36 1,206 0.03
48 720 0.18 164 1,370 42 1,328 465.39 1,328 0.03
49 735 0.44 397 1,725 42 1,682 465.50 1,682 0.04
50 750 0.48 435 2,117 42 2,075 465.62 2,075 0.05
51 765 0.56 506 2,581 42 2,539 465.76 2,539 0.06
52 780 0.60 544 3,083 42 3,041 465.90 3,041 0.07
53 795 0.79 712 3,753 42 3,711 466.09 3,711 0.09
54 810 0.80 718 4,428 42 4,386 466.25 4,386 0.10
55 825 0.41 368 4,754 42 4,712 466.33 4,712 0.11
56 840 0.42 374 5,085 42 5,043 466.41 5,043 0.12
57 855 0.57 509 5,551 42 5,509 466.53 5,509 0.13
58 870 0.54 482 5,991 42 5,949 466.64 5,949 0.14

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 0.54 487 6,436 42 6,394 466.75 6,394 0.15
60 900 0.51 460 6,854 42 6,812 466.85 6,812 0.16
61 915 0.48 433 7,245 42 7,203 466.94 7,203 0.17
62 930 0.45 406 7,609 42 7,567 467.03 7,567 0.17
63 945 0.31 282 7,849 42 7,807 467.08 7,807 0.18
64 960 0.32 287 8,094 42 8,052 467.13 8,052 0.18
65 975 0.01 13 8,065 42 8,022 467.12 8,022 0.18
66 990 0.01 13 8,035 42 7,993 467.12 7,993 0.18
67 1005 0.01 10 8,003 42 7,961 467.11 7,961 0.18
68 1020 0.01 10 7,970 42 7,928 467.10 7,928 0.18
69 1035 0.02 16 7,944 42 7,902 467.10 7,902 0.18
70 1050 0.02 16 7,918 42 7,876 467.09 7,876 0.18
71 1065 0.02 16 7,892 42 7,850 467.09 7,850 0.18
72 1080 0.01 13 7,863 42 7,821 467.08 7,821 0.18
73 1095 0.01 13 7,833 42 7,791 467.08 7,791 0.18
74 1110 0.01 13 7,804 42 7,762 467.07 7,762 0.18
75 1125 0.01 10 7,772 42 7,729 467.06 7,729 0.18
76 1140 0.01 7,736 6 42 7,694 467.06 7,694 0.18
77 1155 0.01 10 7,703 42 7,661 467.05 7,661 0.18
78 1170 0.01 13 7,674 42 7,632 467.04 7,632 0.18
79 1185 0.01 10 7,642 42 7,599 467.04 7,599 0.17
80 1200 0.01 6 7,606 42 7,564 467.03 7,564 0.17
81 1215 0.01 10 7,573 42 7,531 467.02 7,531 0.17
82 1230 0.01 10 7,541 42 7,499 467.01 7,499 0.17
83 1245 0.01 10 7,508 42 7,466 467.01 7,466 0.17
84 1260 0.01 6 7,473 42 7,430 467.00 7,430 0.17
85 1275 0.01 10 7,440 42 7,398 466.99 7,398 0.17
86 1290 0.01 6 7,404 42 7,362 466.98 7,362 0.17
87 1305 0.01 10 7,372 42 7,330 466.98 7,330 0.17
88 1320 0.01 6 7,336 42 7,294 466.97 7,294 0.17
89 1335 0.01 10 7,303 42 7,261 466.96 7,261 0.17
90 1350 0.01 6 7,268 42 7,225 466.95 7,225 0.17
91 1365 0.01 6 7,232 42 7,190 466.94 7,190 0.17
92 1380 0.01 6 7,196 42 7,154 466.93 7,154 0.16
93 1395 0.01 6 7,160 42 7,118 466.92 7,118 0.16
94 1410 0.01 6 7,125 42 7,082 466.92 7,082 0.16
95 1425 0.01 6 7,089 42 7,047 466.91 7,047 0.16
96 1440 0.01 6 7,053 42 7,011 466.90 7,011 0.16
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 2

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.51
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 7.46

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 0.6

RETENTION BASIN

GOLF COURSE

POINT RAIN
3-HOUR 2.12
6-HOUR 2.78
24-HOUR 4.47
BASIN CHARACTERISTICS: ELEVATION AREA
465 15600
466 17120
467 18710
468 20350
468.5 21200
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 1022 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

2.12 10.570 1.00 2.12 2.78 10.570 1.00 2.78 4.47 10.570 1.00 4.47

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 10.57 SUM [7] 2.12 SUM [9] 10.57 SUM [11] 2.78 SUM [13] 10.57 SUM [15] 4.47 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 2.12 2.78 4.47
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 1.54 1.64 1.79
FLOOD VOLUME (cu-ft) 59,174 63,009 68,653
(acre-ft) 1.36 1.45 1.58
REQUIRED STORAGE (cu-ft) 56,096 57,661 56,204
(acre-ft) 1.29 1.32 1.29
PEAK FLOW (cfs) 20.00 17.69 4.66
MAXIMUM WSEL (ft) 468.11 468.19 468.12
24-HOURS
[15] LAG TIME-HOURS
[16] LAG TIME-MINUTES

1.6 1.6

3.2 25.5

5.05 0.02

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 2

10.570
724

0.019
472
468.5

0.137
100.00

0.001
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 3.5
[11] S-FEET/MILE
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 100 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

0.00 0.000 0.0000

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS
(24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 10.57
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.62
UNIT TIME-PERCENT OF LAG 308.6
TOTAL ADJUSTED STORM RAIN-INCHES 2.12
CONSTANT LOSS RATE-in/hr 0.19
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.24 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.331 0.19 0.30 0.14 1.44 360.41
2 10 0.17 1.3 0.331 0.19 0.30 0.14 1.44 360.41
3 15 0.25 1.1 0.280 0.19 0.25 0.09 0.91 199.07
4 20 0.33 1.5 0.382 0.19 0.34 0.19 1.98 521.75
5 25 0.42 1.5 0.382 0.19 0.34 0.19 1.98 521.75
6 30 0.50 1.8 0.458 0.19 0.41 0.26 2.79 763.76
7 35 0.58 1.5 0.382 0.19 0.34 0.19 1.98 521.75
8 40 0.67 1.8 0.458 0.19 0.41 0.26 2.79 763.76
9 45 0.75 1.8 0.458 0.19 0.41 0.26 2.79 763.76
10 50 0.83 1.5 0.382 0.19 0.34 0.19 1.98 521.75
11 55 0.92 1.6 0.407 0.19 0.37 0.21 2.25 602.42
12 60 1.00 1.8 0.458 0.19 0.41 0.26 2.79 763.76
13 65 1.08 2.2 0.560 0.19 0.50 0.37 3.86 1086.45
14 70 1.17 2.2 0.560 0.19 0.50 0.37 3.86 1086.45
15 75 1.25 2.2 0.560 0.19 0.50 0.37 3.86 1086.45
16 80 1.33 2.0 0.509 0.19 0.46 0.31 3.33 925.11
17 85 1.42 2.6 0.661 0.19 0.60 0.47 4.94 1409.13
18 90 1.50 2.7 0.687 0.19 0.62 0.49 5.21 1489.80
19 95 1.58 2.4 0.611 0.19 0.55 0.42 4.40 1247.79
20 100 1.67 2.7 0.687 0.19 0.62 0.49 5.21 1489.80
21 105 1.75 3.3 0.840 0.19 0.76 0.65 6.82 1973.82
22 110 1.83 3.1 0.789 0.19 0.71 0.59 6.28 1812.48
23 115 1.92 2.9 0.738 0.19 0.66 0.54 5.75 1651.14
24 120 2.00 3.0 0.763 0.19 0.69 0.57 6.01 1731.81
25 125 2.08 3.1 0.789 0.19 0.71 0.59 6.28 1812.48
26 130 2.17 4.2 1.068 0.19 0.96 0.87 9.24 2699.85
27 135 2.25 5.0 1.272 0.19 1.14 1.08 11.39 3345.21
28 140 2.33 3.5 0.890 0.19 0.80 0.70 7.36 2135.16
29 145 2.42 6.8 1.730 0.19 1.56 1.54 16.23 4797.28
30 150 2.50 7.3 1.857 0.19 1.67 1.66 17.58 5200.63
31 155 2.58 8.2 2.086 0.19 1.88 1.89 20.00 5926.66
32 160 2.67 5.9 1.501 0.19 1.35 1.31 13.81 4071.24
33 165 2.75 2.0 0.509 0.19 0.46 0.31 3.33 925.11
34 170 2.83 1.8 0.458 0.19 0.41 0.26 2.79 763.76
35 175 2.92 1.8 0.458 0.19 0.41 0.26 2.79 763.76
36 180 3.00 0.6 0.153 0.19 0.14 0.02 0.16 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.54
FLOOD VOLUME (acft) 1.36
FLOOD VOLUME (cuft) 59173.82
REQUIRED STORAGE (acft) 1.29
REQUIRED STORAGE (cuft) 56095.73
PEAK FLOW RATE (cfs) 20.00
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.57
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.62
UNIT TIME-PERCENT OF LAG 308.6
TOTAL ADJUSTED STORM RAIN-INCHES 2.78
CONSTANT LOSS RATE-in/hr 0.194
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.24 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.167 0.19 0.15 0.02 0.18 0.00
2 10 0.17 0.6 0.200 0.19 0.18 0.01 0.06 0.00
3 15 0.25 0.6 0.200 0.19 0.18 0.01 0.06 0.00
4 20 0.33 0.6 0.200 0.19 0.18 0.01 0.06 0.00
5 25 0.42 0.6 0.200 0.19 0.18 0.01 0.06 0.00
6 30 0.50 0.7 0.234 0.19 0.21 0.04 0.42 52.19
7 35 0.58 0.7 0.234 0.19 0.21 0.04 0.42 52.19
8 40 0.67 0.7 0.234 0.19 0.21 0.04 0.42 52.19
9 45 0.75 0.7 0.234 0.19 0.21 0.04 0.42 52.19
10 50 0.83 0.7 0.234 0.19 0.21 0.04 0.42 52.19
11 55 0.92 0.7 0.234 0.19 0.21 0.04 0.42 52.19
12 60 1.00 0.8 0.267 0.19 0.24 0.07 0.77 157.98
13 65 1.08 0.8 0.267 0.19 0.24 0.07 0.77 157.98
14 70 1.17 0.8 0.267 0.19 0.24 0.07 0.77 157.98
15 75 1.25 0.8 0.267 0.19 0.24 0.07 0.77 157.98
16 80 1.33 0.8 0.267 0.19 0.24 0.07 0.77 157.98
17 85 1.42 0.8 0.267 0.19 0.24 0.07 0.77 157.98
18 90 1.50 0.8 0.267 0.19 0.24 0.07 0.77 157.98
19 95 1.58 0.8 0.267 0.19 0.24 0.07 0.77 157.98
20 100 1.67 0.8 0.267 0.19 0.24 0.07 0.77 157.98
21 105 1.75 0.8 0.267 0.19 0.24 0.07 0.77 157.98
22 110 1.83 0.8 0.267 0.19 0.24 0.07 0.77 157.98
23 115 1.92 0.8 0.267 0.19 0.24 0.07 0.77 157.98
24 120 2.00 0.9 0.300 0.19 0.27 0.11 1.12 263.76
25 125 2.08 0.8 0.267 0.19 0.24 0.07 0.77 157.98
26 130 2.17 0.9 0.300 0.19 0.27 0.11 1.12 263.76
27 135 2.25 0.9 0.300 0.19 0.27 0.11 1.12 263.76
28 140 2.33 0.9 0.300 0.19 0.27 0.11 1.12 263.76
29 145 2.42 0.9 0.300 0.19 0.27 0.11 1.12 263.76
30 150 2.50 0.9 0.300 0.19 0.27 0.11 1.12 263.76
31 155 2.58 0.9 0.300 0.19 0.27 0.11 1.12 263.76
32 160 2.67 0.9 0.300 0.19 0.27 0.11 1.12 263.76
33 165 2.75 1.0 0.334 0.19 0.30 0.14 1.47 369.55
34 170 2.83 1.0 0.334 0.19 0.30 0.14 1.47 369.55
35 175 2.92 1.0 0.334 0.19 0.30 0.14 1.47 369.55
36 180 3.00 1.0 0.334 0.19 0.30 0.14 1.47 369.55
37 185 3.08 1.0 0.334 0.19 0.30 0.14 1.47 369.55
38 190 3.17 1.1 0.367 0.19 0.33 0.17 1.83 475.33
39 195 3.25 1.1 0.367 0.19 0.33 0.17 1.83 475.33
40 200 3.33 1.1 0.367 0.19 0.33 0.17 1.83 475.33
41 205 3.42 1.2 0.400 0.19 0.36 0.21 2.18 581.11
42 210 3.50 1.3 0.434 0.19 0.39 0.24 2.53 686.90
43 215 3.58 1.4 0.467 0.19 0.42 0.27 2.88 792.68
44 220 3.67 1.4 0.467 0.19 0.42 0.27 2.88 792.68
45 225 3.75 1.5 0.500 0.19 0.45 0.31 3.24 898.47
46 230 3.83 1.5 0.500 0.19 0.45 0.31 3.24 898.47
47 235 3.92 1.6 0.534 0.19 0.48 0.34 3.59 1004.25
48 240 4.00 1.6 0.534 0.19 0.48 0.34 3.59 1004.25
49 245 4.08 1.7 0.567 0.19 0.51 0.37 3.94 1110.04
50 250 4.17 1.8 0.600 0.19 0.54 0.41 4.29 1215.82
51 255 4.25 1.9 0.634 0.19 0.57 0.44 4.65 1321.61
52 260 4.33 2.0 0.667 0.19 0.60 0.47 5.00 1427.39
53 265 4.42 2.1 0.701 0.19 0.63 0.51 5.35 1533.18
54 270 4.50 2.1 0.701 0.19 0.63 0.51 5.35 1533.18
55 275 4.58 2.2 0.734 0.19 0.66 0.54 5.71 1638.96
56 280 4.67 2.3 0.767 0.19 0.69 0.57 6.06 1744.75

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.801 0.19 0.72 0.61 6.41 1850.53
58 290 4.83 2.4 0.801 0.19 0.72 0.61 6.41 1850.53
59 295 4.92 2.5 0.834 0.19 0.75 0.64 6.76 1956.31
60 300 5.00 2.6 0.867 0.19 0.78 0.67 7.12 2062.10
61 305 5.08 3.1 1.034 0.19 0.93 0.84 8.88 2591.02
62 310 5.17 3.6 1.201 0.19 1.08 1.01 10.64 3119.94
63 315 5.25 3.9 1.301 0.19 1.17 1.11 11.70 3437.30
64 320 5.33 4.2 1.401 0.19 1.26 1.21 12.76 3754.65
65 325 5.42 4.7 1.568 0.19 1.41 1.37 14.52 4283.57
66 330 5.50 5.6 1.868 0.19 1.68 1.67 17.69 5235.64
67 335 5.58 1.9 0.634 0.19 0.57 0.44 4.65 1321.61
68 340 5.67 0.9 0.300 0.19 0.27 0.11 1.12 263.76
69 345 5.75 0.6 0.200 0.19 0.18 0.01 0.06 0.00
70 350 5.83 0.5 0.167 0.19 0.15 0.02 0.18 0.00
71 355 5.92 0.3 0.100 0.19 0.09 0.01 0.11 0.00
72 360 6.00 0.2 0.067 0.19 0.06 0.01 0.07 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.64
FLOOD VOLUME (acft) 1.45
FLOOD VOLUME (cuft) 63008.73
REQUIRED STORAGE (acft) 1.32
REQUIRED STORAGE (cuft) 57661.37
PEAK FLOW RATE (cfs) 17.69
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.570 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.1942 LAG TIME - MINUTES 1.62 MINIMUM LOSS RATE (for var. loss) - in/hr 0.097 UNIT TIME-PERCENT OF LAG 925.8 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 4.47 C 0.00180
PERCOLATION RATE (cfs) 0.24
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.036 0.343 0.032 0.004 0.04 0.00
2 30 0.50 0.3 0.054 0.339 0.048 0.005 0.06 0.00
3 45 0.75 0.3 0.054 0.335 0.048 0.005 0.06 0.00
4 60 1.00 0.4 0.072 0.331 0.064 0.007 0.08 0.00
5 75 1.25 0.3 0.054 0.327 0.048 0.005 0.06 0.00
6 90 1.50 0.3 0.054 0.323 0.048 0.005 0.06 0.00
7 105 1.75 0.3 0.054 0.319 0.048 0.005 0.06 0.00
8 120 2.00 0.4 0.072 0.316 0.064 0.007 0.08 0.00
9 135 2.25 0.4 0.072 0.312 0.064 0.007 0.08 0.00
10 150 2.50 0.4 0.072 0.308 0.064 0.007 0.08 0.00
11 165 2.75 0.5 0.089 0.304 0.080 0.009 0.09 0.00
12 180 3.00 0.5 0.089 0.300 0.080 0.009 0.09 0.00
13 195 3.25 0.5 0.089 0.297 0.080 0.009 0.09 0.00
14 210 3.50 0.5 0.089 0.293 0.080 0.009 0.09 0.00
15 225 3.75 0.5 0.089 0.289 0.080 0.009 0.09 0.00
16 240 4.00 0.6 0.107 0.286 0.097 0.011 0.11 0.00
17 255 4.25 0.6 0.107 0.282 0.097 0.011 0.11 0.00
18 270 4.50 0.7 0.125 0.278 0.113 0.013 0.13 0.00
19 285 4.75 0.7 0.125 0.275 0.113 0.013 0.13 0.00
20 300 5.00 0.8 0.143 0.271 0.129 0.014 0.15 0.00
21 315 5.25 0.6 0.107 0.268 0.097 0.011 0.11 0.00
22 330 5.50 0.7 0.125 0.264 0.113 0.013 0.13 0.00
23 345 5.75 0.8 0.143 0.261 0.129 0.014 0.15 0.00
24 360 6.00 0.8 0.143 0.257 0.129 0.014 0.15 0.00
25 375 6.25 0.9 0.161 0.254 0.145 0.016 0.17 0.00
26 390 6.50 0.9 0.161 0.251 0.145 0.016 0.17 0.00
27 405 6.75 1.0 0.179 0.247 0.161 0.018 0.19 0.00
28 420 7.00 1.0 0.179 0.244 0.161 0.018 0.19 0.00
29 435 7.25 1.0 0.179 0.241 0.161 0.018 0.19 0.00
30 450 7.50 1.1 0.197 0.237 0.177 0.020 0.21 0.00
31 465 7.75 1.2 0.215 0.234 0.193 0.021 0.23 0.00
32 480 8.00 1.3 0.232 0.231 0.209 0.002 0.02 0.00
33 495 8.25 1.5 0.268 0.228 0.241 0.041 0.43 167.88
34 510 8.50 1.5 0.268 0.224 0.241 0.044 0.46 198.07
35 525 8.75 1.6 0.286 0.221 0.257 0.065 0.68 398.09
36 540 9.00 1.7 0.304 0.218 0.274 0.086 0.91 597.84
37 555 9.25 1.9 0.340 0.215 0.306 0.125 1.32 967.41
38 570 9.50 2.0 0.358 0.212 0.322 0.146 1.54 1166.63
39 585 9.75 2.1 0.375 0.209 0.338 0.166 1.76 1365.57
40 600 10.00 2.2 0.393 0.206 0.354 0.187 1.98 1564.23
41 615 10.25 1.5 0.268 0.203 0.241 0.065 0.69 401.88
42 630 10.50 1.5 0.268 0.200 0.241 0.068 0.72 429.90
43 645 10.75 2.0 0.358 0.197 0.322 0.160 1.70 1308.09
44 660 11.00 2.0 0.358 0.194 0.322 0.163 1.73 1335.54
45 675 11.25 1.9 0.340 0.191 0.306 0.148 1.57 1192.62
46 690 11.50 1.9 0.340 0.189 0.306 0.151 1.60 1219.49
47 705 11.75 1.7 0.304 0.186 0.274 0.118 1.25 905.90
48 720 12.00 1.8 0.322 0.183 0.290 0.139 1.47 1102.28
49 735 12.25 2.5 0.447 0.180 0.402 0.267 2.82 2318.92
50 750 12.50 2.6 0.465 0.178 0.418 0.287 3.04 2514.71
51 765 12.75 2.8 0.501 0.175 0.451 0.326 3.44 2880.29
52 780 13.00 2.9 0.519 0.172 0.467 0.346 3.66 3075.47
53 795 13.25 3.4 0.608 0.170 0.547 0.438 4.63 3950.71
54 810 13.50 3.4 0.608 0.167 0.547 0.441 4.66 3975.18
55 825 13.75 2.3 0.411 0.165 0.370 0.247 2.61 2128.32
56 840 14.00 2.3 0.411 0.162 0.370 0.249 2.63 2152.16
57 855 14.25 2.7 0.483 0.160 0.434 0.323 3.42 2856.04
58 870 14.50 2.6 0.465 0.157 0.418 0.308 3.25 2709.14
59 885 14.75 2.6 0.465 0.155 0.418 0.310 3.28 2732.00
60 900 15.00 2.5 0.447 0.152 0.402 0.295 3.11 2584.44
61 915 15.25 2.4 0.429 0.150 0.386 0.279 2.95 2436.54
62 930 15.50 2.3 0.411 0.148 0.370 0.263 2.78 2288.29
63 945 15.75 1.9 0.340 0.146 0.306 0.194 2.05 1629.43
64 960 16.00 1.9 0.340 0.143 0.306 0.196 2.08 1650.58
65 975 16.25 0.4 0.072 0.141 0.064 0.007 0.08 0.00
66 990 16.50 0.4 0.072 0.139 0.064 0.007 0.08 0.00
67 1005 16.75 0.3 0.054 0.137 0.048 0.005 0.06 0.00
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
68 1020 17.00 0.3 0.054 0.135 0.048 0.005 0.06 0.00
69 1035 17.25 0.5 0.089 0.133 0.080 0.009 0.09 0.00
70 1050 17.50 0.5 0.089 0.131 0.080 0.009 0.09 0.00
71 1065 17.75 0.5 0.089 0.129 0.080 0.009 0.09 0.00
72 1080 18.00 0.4 0.072 0.127 0.064 0.007 0.08 0.00
73 1095 18.25 0.4 0.072 0.125 0.064 0.007 0.08 0.00
74 1110 18.50 0.4 0.072 0.123 0.064 0.007 0.08 0.00
75 1125 18.75 0.3 0.054 0.121 0.048 0.005 0.06 0.00
76 1140 19.00 0.2 0.036 0.120 0.032 0.004 0.04 0.00
77 1155 19.25 0.3 0.054 0.118 0.048 0.005 0.06 0.00
78 1170 19.50 0.4 0.072 0.116 0.064 0.007 0.08 0.00
79 1185 19.75 0.3 0.054 0.115 0.048 0.005 0.06 0.00
80 1200 20.00 0.2 0.036 0.113 0.032 0.004 0.04 0.00
81 1215 20.25 0.3 0.054 0.112 0.048 0.005 0.06 0.00
82 1230 20.50 0.3 0.054 0.110 0.048 0.005 0.06 0.00
83 1245 20.75 0.3 0.054 0.109 0.048 0.005 0.06 0.00
84 1260 21.00 0.2 0.036 0.108 0.032 0.004 0.04 0.00
85 1275 21.25 0.3 0.054 0.106 0.048 0.005 0.06 0.00
86 1290 21.50 0.2 0.036 0.105 0.032 0.004 0.04 0.00
87 1305 21.75 0.3 0.054 0.104 0.048 0.005 0.06 0.00
88 1320 22.00 0.2 0.036 0.103 0.032 0.004 0.04 0.00
89 1335 22.25 0.3 0.054 0.102 0.048 0.005 0.06 0.00
90 1350 22.50 0.2 0.036 0.101 0.032 0.004 0.04 0.00
91 1365 22.75 0.2 0.036 0.100 0.032 0.004 0.04 0.00
92 1380 23.00 0.2 0.036 0.099 0.032 0.004 0.04 0.00
93 1395 23.25 0.2 0.036 0.099 0.032 0.004 0.04 0.00
94 1410 23.50 0.2 0.036 0.098 0.032 0.004 0.04 0.00
95 1425 23.75 0.2 0.036 0.097 0.032 0.004 0.04 0.00
96 1440 24.00 0.2 0.036 0.097 0.032 0.004 0.04 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.79
FLOOD VOLUME (acft) 1.58
FLOOD VOLUME (cuft) 68652.95
REQUIRED STORAGE (acft) 1.29
REQUIRED STORAGE (cuft) 56203.65
PEAK FLOW (cfs) 4.66
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.24 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.24 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 1.44 433 433 73 360 465.02 360 0.01
2 10 1.44 433 793 73 721 465.04 721 0.02
3 15 0.91 272 992 73 920 465.06 920 0.02
4 20 1.98 594 1,514 73 1,442 465.09 1,442 0.03
5 25 1.98 594 2,036 73 1,963 465.12 1,963 0.05
6 30 2.79 836 2,800 73 2,727 465.17 2,727 0.06
7 35 1.98 594 3,322 73 3,249 465.20 3,249 0.07
8 40 2.79 836 4,085 73 4,013 465.25 4,013 0.09
9 45 2.79 836 4,849 73 4,776 465.29 4,776 0.11
10 50 1.98 594 5,371 73 5,298 465.32 5,298 0.12
11 55 2.25 675 5,973 73 5,901 465.36 5,901 0.14
12 60 2.79 836 6,737 73 6,664 465.41 6,664 0.15
13 65 3.86 1,159 7,823 73 7,751 465.47 7,751 0.18
14 70 3.86 1,159 8,910 73 8,837 465.54 8,837 0.20
15 75 3.86 1,159 9,996 73 9,924 465.61 9,924 0.23
16 80 3.33 998 10,921 73 10,849 465.66 10,849 0.25
17 85 4.94 1,482 12,331 73 12,258 465.75 12,258 0.28
18 90 5.21 1,562 13,820 73 13,748 465.84 13,748 0.32
19 95 4.40 1,320 15,068 73 14,996 465.92 14,996 0.34
20 100 5.21 1,562 16,558 73 16,485 466.01 16,485 0.38
21 105 6.82 2,046 18,532 73 18,459 466.12 18,459 0.42
22 110 6.28 1,885 20,344 73 20,272 466.22 20,272 0.47
23 115 5.75 1,724 21,995 73 21,923 466.31 21,923 0.50
24 120 6.01 1,804 23,727 73 23,655 466.41 23,655 0.54
25 125 6.28 1,885 25,540 73 25,467 466.51 25,467 0.58
26 130 9.24 2,772 28,239 73 28,167 466.66 28,167 0.65
27 135 11.39 3,418 31,585 73 31,512 466.85 31,512 0.72
28 140 7.36 2,208 33,720 73 33,647 466.96 33,647 0.77
29 145 16.23 4,870 38,517 73 38,445 467.21 38,445 0.88
30 150 17.58 5,273 43,718 73 43,645 467.48 43,645 1.00
31 155 20.00 5,999 49,644 73 49,572 467.78 49,572 1.14
32 160 13.81 4,144 53,716 73 53,643 467.99 53,643 1.23
33 165 3.33 998 54,641 73 54,568 468.04 54,568 1.25
34 170 2.79 836 55,405 73 55,332 468.07 55,332 1.27
35 175 2.79 836 56,168 73 56,096 468.11 56,096 1.29
36 180 0.16 48 56,144 73 56,072 468.11 56,072 1.29

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.18 53 53 73 - 465.00 - 0.00
2 10 0.06 19 19 73 - 465.00 - 0.00
3 15 0.06 19 19 73 - 465.00 - 0.00
4 20 0.06 19 19 73 - 465.00 - 0.00
5 25 0.06 19 19 73 - 465.00 - 0.00
6 30 0.42 125 125 73 52 465.00 52 0.00
7 35 0.42 125 177 73 104 465.01 104 0.00
8 40 0.42 125 229 73 157 465.01 157 0.00
9 45 0.42 125 281 73 209 465.01 209 0.00
10 50 0.42 125 334 73 261 465.02 261 0.01
11 55 0.42 125 386 73 313 465.02 313 0.01
12 60 0.77 231 544 73 471 465.03 471 0.01
13 65 0.77 231 702 73 629 465.04 629 0.01
14 70 0.77 231 860 73 787 465.05 787 0.02
15 75 0.77 231 1,018 73 945 465.06 945 0.02
16 80 0.77 231 1,176 73 1,103 465.07 1,103 0.03
17 85 0.77 231 1,334 73 1,261 465.08 1,261 0.03
18 90 0.77 231 1,492 73 1,419 465.09 1,419 0.03
19 95 0.77 231 1,650 73 1,577 465.10 1,577 0.04
20 100 0.77 231 1,808 73 1,735 465.11 1,735 0.04
21 105 0.77 231 1,966 73 1,893 465.12 1,893 0.04
22 110 0.77 231 2,123 73 2,051 465.13 2,051 0.05
23 115 0.77 231 2,281 73 2,209 465.14 2,209 0.05
24 120 1.12 336 2,545 73 2,473 465.15 2,473 0.06
25 125 0.77 231 2,703 73 2,631 465.16 2,631 0.06
26 130 1.12 336 2,967 73 2,894 465.18 2,894 0.07
27 135 1.12 336 3,231 73 3,158 465.19 3,158 0.07
28 140 1.12 336 3,494 73 3,422 465.21 3,422 0.08
29 145 1.12 336 3,758 73 3,686 465.23 3,686 0.08
30 150 1.12 336 4,022 73 3,949 465.24 3,949 0.09
31 155 1.12 336 4,286 73 4,213 465.26 4,213 0.10
32 160 1.12 336 4,550 73 4,477 465.27 4,477 0.10
33 165 1.47 442 4,919 73 4,846 465.30 4,846 0.11
34 170 1.47 442 5,289 73 5,216 465.32 5,216 0.12
35 175 1.47 442 5,658 73 5,586 465.34 5,586 0.13
36 180 1.47 442 6,028 73 5,955 465.36 5,955 0.14
37 185 1.47 442 6,397 73 6,325 465.39 6,325 0.15
38 190 1.83 548 6,873 73 6,800 465.42 6,800 0.16
39 195 1.83 548 7,348 73 7,275 465.44 7,275 0.17
40 200 1.83 548 7,823 73 7,751 465.47 7,751 0.18
41 205 2.18 654 8,404 73 8,332 465.51 8,332 0.19
42 210 2.53 759 9,091 73 9,019 465.55 9,019 0.21
43 215 2.88 865 9,884 73 9,811 465.60 9,811 0.23
44 220 2.88 865 10,677 73 10,604 465.65 10,604 0.24
45 225 3.24 971 11,575 73 11,503 465.70 11,503 0.26
46 230 3.24 971 12,474 73 12,401 465.76 12,401 0.28
47 235 3.59 1,077 13,478 73 13,405 465.82 13,405 0.31
48 240 3.59 1,077 14,482 73 14,409 465.88 14,409 0.33
49 245 3.94 1,183 15,592 73 15,520 465.95 15,520 0.36
50 250 4.29 1,288 16,808 73 16,735 466.02 16,735 0.38
51 255 4.65 1,394 18,130 73 18,057 466.09 18,057 0.41
52 260 5.00 1,500 19,557 73 19,484 466.17 19,484 0.45
53 265 5.35 1,606 21,090 73 21,018 466.26 21,018 0.48
54 270 5.35 1,606 22,623 73 22,551 466.35 22,551 0.52
55 275 5.71 1,712 24,262 73 24,190 466.44 24,190 0.56

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 6.06 1,817 26,007 73 25,934 466.53 25,934 0.60
57 285 6.41 1,923 27,858 73 27,785 466.64 27,785 0.64
58 290 6.41 1,923 29,708 73 29,635 466.74 29,635 0.68
59 295 6.76 2,029 31,664 73 31,592 466.85 31,592 0.73
60 300 7.12 2,135 33,726 73 33,654 466.97 33,654 0.77
61 305 8.88 2,664 36,317 73 36,245 467.10 36,245 0.83
62 310 10.64 3,193 39,437 73 39,365 467.26 39,365 0.90
63 315 11.70 3,510 42,875 73 42,802 467.44 42,802 0.98
64 320 12.76 3,827 46,629 73 46,557 467.63 46,557 1.07
65 325 14.52 4,356 50,913 73 50,840 467.85 50,840 1.17
66 330 17.69 5,308 56,149 73 56,076 468.11 56,076 1.29
67 335 4.65 1,394 57,470 73 57,398 468.17 57,398 1.32
68 340 1.12 336 57,734 73 57,661 468.19 57,661 1.32
69 345 0.06 19 57,680 73 57,608 468.18 57,608 1.32
70 350 0.18 53 57,661 73 57,588 468.18 57,588 1.32
71 355 0.11 32 57,620 73 57,547 468.18 57,547 1.32
72 360 0.07 21 57,568 73 57,496 468.18 57,496 1.32
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.04 34 34 218 - 465.00 - 0.00
2 30 0.06 51 51 218 - 465.00 - 0.00
3 45 0.06 51 51 218 - 465.00 - 0.00
4 60 0.08 68 68 218 - 465.00 - 0.00
5 75 0.06 51 51 218 - 465.00 - 0.00
6 90 0.06 51 51 218 - 465.00 - 0.00
7 105 0.06 51 51 218 - 465.00 - 0.00
8 120 0.08 68 68 218 - 465.00 - 0.00
9 135 0.08 68 68 218 - 465.00 - 0.00
10 150 0.08 68 68 218 - 465.00 - 0.00
11 165 0.09 85 85 218 - 465.00 - 0.00
12 180 0.09 85 85 218 - 465.00 - 0.00
13 195 0.09 85 85 218 - 465.00 - 0.00
14 210 0.09 85 85 218 - 465.00 - 0.00
15 225 0.09 85 85 218 - 465.00 - 0.00
16 240 0.11 102 102 218 - 465.00 - 0.00
17 255 0.11 102 102 218 - 465.00 - 0.00
18 270 0.13 119 119 218 - 465.00 - 0.00
19 285 0.13 119 119 218 - 465.00 - 0.00
20 300 0.15 136 136 218 - 465.00 - 0.00
21 315 0.11 102 102 218 - 465.00 - 0.00
22 330 0.13 119 119 218 - 465.00 - 0.00
23 345 0.15 136 136 218 - 465.00 - 0.00
24 360 0.15 136 136 218 - 465.00 - 0.00
25 375 0.17 153 153 218 - 465.00 - 0.00
26 390 0.17 153 153 218 - 465.00 - 0.00
27 405 0.19 170 170 218 - 465.00 - 0.00
28 420 0.19 170 170 218 - 465.00 - 0.00
29 435 0.19 170 170 218 - 465.00 - 0.00
30 450 0.21 187 187 218 - 465.00 - 0.00
31 465 0.23 204 204 218 - 465.00 - 0.00
32 480 0.02 15 15 218 - 465.00 - 0.00
33 495 0.43 386 386 218 168 465.01 168 0.00
34 510 0.46 416 584 218 366 465.02 366 0.01
35 525 0.68 616 982 218 764 465.05 764 0.02
36 540 0.91 816 1,580 218 1,362 465.08 1,362 0.03
37 555 1.32 1,185 2,547 218 2,329 465.14 2,329 0.05
38 570 1.54 1,384 3,714 218 3,496 465.21 3,496 0.08
39 585 1.76 1,583 5,079 218 4,861 465.30 4,861 0.11
40 600 1.98 1,782 6,643 218 6,426 465.39 6,426 0.15
41 615 0.69 620 7,045 218 6,828 465.42 6,828 0.16
42 630 0.72 648 7,475 218 7,257 465.44 7,257 0.17
43 645 1.70 1,526 8,783 218 8,566 465.52 8,566 0.20
44 660 1.73 1,553 10,119 218 9,901 465.61 9,901 0.23
45 675 1.57 1,410 11,311 218 11,094 465.68 11,094 0.25
46 690 1.60 1,437 12,531 218 12,313 465.75 12,313 0.28
47 705 1.25 1,124 13,437 218 13,219 465.81 13,219 0.30
48 720 1.47 1,320 14,539 218 14,321 465.88 14,321 0.33
49 735 2.82 2,537 16,858 218 16,640 466.02 16,640 0.38
50 750 3.04 2,732 19,373 218 19,155 466.16 19,155 0.44
51 765 3.44 3,098 22,253 218 22,035 466.32 22,035 0.51
52 780 3.66 3,293 25,329 218 25,111 466.49 25,111 0.58
53 795 4.63 4,168 29,279 218 29,062 466.71 29,062 0.67
54 810 4.66 4,193 33,254 218 33,037 466.93 33,037 0.76
55 825 2.61 2,346 35,383 218 35,165 467.05 35,165 0.81
56 840 2.63 2,370 37,535 218 37,317 467.16 37,317 0.86
57 855 3.42 3,074 40,391 218 40,173 467.30 40,173 0.92
58 870 3.25 2,927 43,100 218 42,882 467.44 42,882 0.98

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 3.28 2,950 45,832 218 45,614 467.58 45,614 1.05
60 900 3.11 2,802 48,417 218 48,199 467.71 48,199 1.11
61 915 2.95 2,654 50,853 218 50,635 467.84 50,635 1.16
62 930 2.78 2,506 53,141 218 52,924 467.95 52,924 1.21
63 945 2.05 1,847 54,771 218 54,553 468.04 54,553 1.25
64 960 2.08 1,868 56,421 218 56,204 468.12 56,204 1.29
65 975 0.08 68 56,272 218 56,054 468.11 56,054 1.29
66 990 0.08 68 56,122 218 55,904 468.10 55,904 1.28
67 1005 0.06 51 55,955 218 55,738 468.09 55,738 1.28
68 1020 0.06 51 55,789 218 55,571 468.08 55,571 1.28
69 1035 0.09 85 55,656 218 55,438 468.08 55,438 1.27
70 1050 0.09 85 55,523 218 55,305 468.07 55,305 1.27
71 1065 0.09 85 55,390 218 55,173 468.07 55,173 1.27
72 1080 0.08 68 55,241 218 55,023 468.06 55,023 1.26
73 1095 0.08 68 55,091 218 54,873 468.05 54,873 1.26
74 1110 0.08 68 54,941 218 54,724 468.04 54,724 1.26
75 1125 0.06 51 54,775 218 54,557 468.04 54,557 1.25
76 1140 0.04 54,591 34 218 54,373 468.03 54,373 1.25
77 1155 0.06 51 54,424 218 54,206 468.02 54,206 1.24
78 1170 0.08 68 54,274 218 54,057 468.01 54,057 1.24
79 1185 0.06 51 54,108 218 53,890 468.00 53,890 1.24
80 1200 0.04 34 53,924 218 53,706 467.99 53,706 1.23
81 1215 0.06 51 53,757 218 53,539 467.99 53,539 1.23
82 1230 0.06 51 53,590 218 53,373 467.98 53,373 1.23
83 1245 0.06 51 53,424 218 53,206 467.97 53,206 1.22
84 1260 0.04 34 53,240 218 53,022 467.96 53,022 1.22
85 1275 0.06 51 53,073 218 52,856 467.95 52,856 1.21
86 1290 0.04 34 52,890 218 52,672 467.94 52,672 1.21
87 1305 0.06 51 52,723 218 52,505 467.93 52,505 1.21
88 1320 0.04 34 52,539 218 52,321 467.92 52,321 1.20
89 1335 0.06 51 52,372 218 52,155 467.92 52,155 1.20
90 1350 0.04 34 52,189 218 51,971 467.91 51,971 1.19
91 1365 0.04 34 52,005 218 51,787 467.90 51,787 1.19
92 1380 0.04 34 51,821 218 51,603 467.89 51,603 1.18
93 1395 0.04 34 51,637 218 51,420 467.88 51,420 1.18
94 1410 0.04 34 51,454 218 51,236 467.87 51,236 1.18
95 1425 0.04 34 51,270 218 51,052 467.86 51,052 1.17
96 1440 0.04 34 51,086 218 50,869 467.85 50,869 1.17
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 3

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.56
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 6.65

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 1.04

RETENTION BASIN

GOLF COURSE

POINT RAIN
3-HOUR 2.12
6-HOUR 2.78
24-HOUR 4.47
BASIN CHARACTERISTICS: ELEVATION AREA
465 15000
466 16600
467 18250
468 19960
468.5 20831
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 1036 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

2.12 10.250 1.00 2.12 2.78 10.250 1.00 2.78 4.47 10.250 1.00 4.47

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 10.25 SUM [7] 2.12 SUM [9] 10.25 SUM [11] 2.78 SUM [13] 10.25 SUM [15] 4.47 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 2.12 2.78 4.47
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 1.51 1.59 1.71
FLOOD VOLUME (cu-ft) 56,125 59,056 63,525
(acre-ft) 1.29 1.36 1.46
REQUIRED STORAGE (cu-ft) 53,172 53,709 51,340
(acre-ft) 1.22 1.23 1.18
PEAK FLOW (cfs) 19.27 17.04 4.42
MAXIMUM WSEL (ft) 468.04 468.07 467.95

0.142
170.00

0.001
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 3.3
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 3

10.250
750

0.032
471.8
468.5

0.03 2.0

2.0 4.1

23.2 4.82

0.23 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 100 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

0.00 0.000 0.0000

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 10.25
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.05
UNIT TIME-PERCENT OF LAG 244.5
TOTAL ADJUSTED STORM RAIN-INCHES 2.12
CONSTANT LOSS RATE-in/hr 0.21
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.23 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.331 0.21 0.30 0.12 1.28 314.48
2 10 0.17 1.3 0.331 0.21 0.30 0.12 1.28 314.48
3 15 0.25 1.1 0.280 0.21 0.25 0.07 0.76 158.02
4 20 0.33 1.5 0.382 0.21 0.34 0.18 1.80 470.93
5 25 0.42 1.5 0.382 0.21 0.34 0.18 1.80 470.93
6 30 0.50 1.8 0.458 0.21 0.41 0.25 2.58 705.62
7 35 0.58 1.5 0.382 0.21 0.34 0.18 1.80 470.93
8 40 0.67 1.8 0.458 0.21 0.41 0.25 2.58 705.62
9 45 0.75 1.8 0.458 0.21 0.41 0.25 2.58 705.62
10 50 0.83 1.5 0.382 0.21 0.34 0.18 1.80 470.93
11 55 0.92 1.6 0.407 0.21 0.37 0.20 2.06 549.16
12 60 1.00 1.8 0.458 0.21 0.41 0.25 2.58 705.62
13 65 1.08 2.2 0.560 0.21 0.50 0.35 3.63 1018.53
14 70 1.17 2.2 0.560 0.21 0.50 0.35 3.63 1018.53
15 75 1.25 2.2 0.560 0.21 0.50 0.35 3.63 1018.53
16 80 1.33 2.0 0.509 0.21 0.46 0.30 3.11 862.07
17 85 1.42 2.6 0.661 0.21 0.60 0.46 4.67 1331.44
18 90 1.50 2.7 0.687 0.21 0.62 0.48 4.93 1409.67
19 95 1.58 2.4 0.611 0.21 0.55 0.40 4.15 1174.98
20 100 1.67 2.7 0.687 0.21 0.62 0.48 4.93 1409.67
21 105 1.75 3.3 0.840 0.21 0.76 0.63 6.50 1879.04
22 110 1.83 3.1 0.789 0.21 0.71 0.58 5.97 1722.58
23 115 1.92 2.9 0.738 0.21 0.66 0.53 5.45 1566.12
24 120 2.00 3.0 0.763 0.21 0.69 0.56 5.71 1644.35
25 125 2.08 3.1 0.789 0.21 0.71 0.58 5.97 1722.58
26 130 2.17 4.2 1.068 0.21 0.96 0.86 8.84 2583.09
27 135 2.25 5.0 1.272 0.21 1.14 1.07 10.93 3208.91
28 140 2.33 3.5 0.890 0.21 0.80 0.68 7.02 2035.49
29 145 2.42 6.8 1.730 0.21 1.56 1.52 15.62 4617.02
30 150 2.50 7.3 1.857 0.21 1.67 1.65 16.93 5008.16
31 155 2.58 8.2 2.086 0.21 1.88 1.88 19.27 5712.21
32 160 2.67 5.9 1.501 0.21 1.35 1.30 13.28 3912.96
33 165 2.75 2.0 0.509 0.21 0.46 0.30 3.11 862.07
34 170 2.83 1.8 0.458 0.21 0.41 0.25 2.58 705.62
35 175 2.92 1.8 0.458 0.21 0.41 0.25 2.58 705.62
36 180 3.00 0.6 0.153 0.21 0.14 0.02 0.16 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.51
FLOOD VOLUME (acft) 1.29
FLOOD VOLUME (cuft) 56125.24
REQUIRED STORAGE (acft) 1.22
REQUIRED STORAGE (cuft) 53171.53
PEAK FLOW RATE (cfs) 19.27
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.25
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.05
UNIT TIME-PERCENT OF LAG 244.5
TOTAL ADJUSTED STORM RAIN-INCHES 2.78
CONSTANT LOSS RATE-in/hr 0.206
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.23 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.167 0.21 0.15 0.02 0.17 0.00
2 10 0.17 0.6 0.200 0.21 0.18 0.02 0.21 0.00
3 15 0.25 0.6 0.200 0.21 0.18 0.02 0.21 0.00
4 20 0.33 0.6 0.200 0.21 0.18 0.02 0.21 0.00
5 25 0.42 0.6 0.200 0.21 0.18 0.02 0.21 0.00
6 30 0.50 0.7 0.234 0.21 0.21 0.03 0.28 15.59
7 35 0.58 0.7 0.234 0.21 0.21 0.03 0.28 15.59
8 40 0.67 0.7 0.234 0.21 0.21 0.03 0.28 15.59
9 45 0.75 0.7 0.234 0.21 0.21 0.03 0.28 15.59
10 50 0.83 0.7 0.234 0.21 0.21 0.03 0.28 15.59
11 55 0.92 0.7 0.234 0.21 0.21 0.03 0.28 15.59
12 60 1.00 0.8 0.267 0.21 0.24 0.06 0.63 118.17
13 65 1.08 0.8 0.267 0.21 0.24 0.06 0.63 118.17
14 70 1.17 0.8 0.267 0.21 0.24 0.06 0.63 118.17
15 75 1.25 0.8 0.267 0.21 0.24 0.06 0.63 118.17
16 80 1.33 0.8 0.267 0.21 0.24 0.06 0.63 118.17
17 85 1.42 0.8 0.267 0.21 0.24 0.06 0.63 118.17
18 90 1.50 0.8 0.267 0.21 0.24 0.06 0.63 118.17
19 95 1.58 0.8 0.267 0.21 0.24 0.06 0.63 118.17
20 100 1.67 0.8 0.267 0.21 0.24 0.06 0.63 118.17
21 105 1.75 0.8 0.267 0.21 0.24 0.06 0.63 118.17
22 110 1.83 0.8 0.267 0.21 0.24 0.06 0.63 118.17
23 115 1.92 0.8 0.267 0.21 0.24 0.06 0.63 118.17
24 120 2.00 0.9 0.300 0.21 0.27 0.09 0.97 220.75
25 125 2.08 0.8 0.267 0.21 0.24 0.06 0.63 118.17
26 130 2.17 0.9 0.300 0.21 0.27 0.09 0.97 220.75
27 135 2.25 0.9 0.300 0.21 0.27 0.09 0.97 220.75
28 140 2.33 0.9 0.300 0.21 0.27 0.09 0.97 220.75
29 145 2.42 0.9 0.300 0.21 0.27 0.09 0.97 220.75
30 150 2.50 0.9 0.300 0.21 0.27 0.09 0.97 220.75
31 155 2.58 0.9 0.300 0.21 0.27 0.09 0.97 220.75
32 160 2.67 0.9 0.300 0.21 0.27 0.09 0.97 220.75
33 165 2.75 1.0 0.334 0.21 0.30 0.13 1.31 323.33
34 170 2.83 1.0 0.334 0.21 0.30 0.13 1.31 323.33
35 175 2.92 1.0 0.334 0.21 0.30 0.13 1.31 323.33
36 180 3.00 1.0 0.334 0.21 0.30 0.13 1.31 323.33
37 185 3.08 1.0 0.334 0.21 0.30 0.13 1.31 323.33
38 190 3.17 1.1 0.367 0.21 0.33 0.16 1.65 425.91
39 195 3.25 1.1 0.367 0.21 0.33 0.16 1.65 425.91
40 200 3.33 1.1 0.367 0.21 0.33 0.16 1.65 425.91
41 205 3.42 1.2 0.400 0.21 0.36 0.19 1.99 528.50
42 210 3.50 1.3 0.434 0.21 0.39 0.23 2.34 631.08
43 215 3.58 1.4 0.467 0.21 0.42 0.26 2.68 733.66
44 220 3.67 1.4 0.467 0.21 0.42 0.26 2.68 733.66
45 225 3.75 1.5 0.500 0.21 0.45 0.29 3.02 836.24
46 230 3.83 1.5 0.500 0.21 0.45 0.29 3.02 836.24
47 235 3.92 1.6 0.534 0.21 0.48 0.33 3.36 938.82
48 240 4.00 1.6 0.534 0.21 0.48 0.33 3.36 938.82
49 245 4.08 1.7 0.567 0.21 0.51 0.36 3.70 1041.41
50 250 4.17 1.8 0.600 0.21 0.54 0.39 4.05 1143.99
51 255 4.25 1.9 0.634 0.21 0.57 0.43 4.39 1246.57
52 260 4.33 2.0 0.667 0.21 0.60 0.46 4.73 1349.15
53 265 4.42 2.1 0.701 0.21 0.63 0.49 5.07 1451.73
54 270 4.50 2.1 0.701 0.21 0.63 0.49 5.07 1451.73
55 275 4.58 2.2 0.734 0.21 0.66 0.53 5.41 1554.32
56 280 4.67 2.3 0.767 0.21 0.69 0.56 5.76 1656.90

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.801 0.21 0.72 0.59 6.10 1759.48
58 290 4.83 2.4 0.801 0.21 0.72 0.59 6.10 1759.48
59 295 4.92 2.5 0.834 0.21 0.75 0.63 6.44 1862.06
60 300 5.00 2.6 0.867 0.21 0.78 0.66 6.78 1964.64
61 305 5.08 3.1 1.034 0.21 0.93 0.83 8.49 2477.55
62 310 5.17 3.6 1.201 0.21 1.08 1.00 10.20 2990.46
63 315 5.25 3.9 1.301 0.21 1.17 1.10 11.23 3298.21
64 320 5.33 4.2 1.401 0.21 1.26 1.20 12.25 3605.96
65 325 5.42 4.7 1.568 0.21 1.41 1.36 13.96 4118.87
66 330 5.50 5.6 1.868 0.21 1.68 1.66 17.04 5042.10
67 335 5.58 1.9 0.634 0.21 0.57 0.43 4.39 1246.57
68 340 5.67 0.9 0.300 0.21 0.27 0.09 0.97 220.75
69 345 5.75 0.6 0.200 0.21 0.18 0.02 0.21 0.00
70 350 5.83 0.5 0.167 0.21 0.15 0.02 0.17 0.00
71 355 5.92 0.3 0.100 0.21 0.09 0.01 0.10 0.00
72 360 6.00 0.2 0.067 0.21 0.06 0.01 0.07 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.59
FLOOD VOLUME (acft) 1.36
FLOOD VOLUME (cuft) 59055.81
REQUIRED STORAGE (acft) 1.23
REQUIRED STORAGE (cuft) 53709.02
PEAK FLOW RATE (cfs) 17.04
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 10.250 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2058 LAG TIME - MINUTES 2.05 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 UNIT TIME-PERCENT OF LAG 733.4 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 4.47 C 0.00191
PERCOLATION RATE (cfs) 0.23
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.036 0.363 0.032 0.004 0.04 0.00
2 30 0.50 0.3 0.054 0.359 0.048 0.005 0.05 0.00
3 45 0.75 0.3 0.054 0.355 0.048 0.005 0.05 0.00
4 60 1.00 0.4 0.072 0.351 0.064 0.007 0.07 0.00
5 75 1.25 0.3 0.054 0.347 0.048 0.005 0.05 0.00
6 90 1.50 0.3 0.054 0.343 0.048 0.005 0.05 0.00
7 105 1.75 0.3 0.054 0.338 0.048 0.005 0.05 0.00
8 120 2.00 0.4 0.072 0.334 0.064 0.007 0.07 0.00
9 135 2.25 0.4 0.072 0.330 0.064 0.007 0.07 0.00
10 150 2.50 0.4 0.072 0.326 0.064 0.007 0.07 0.00
11 165 2.75 0.5 0.089 0.322 0.080 0.009 0.09 0.00
12 180 3.00 0.5 0.089 0.318 0.080 0.009 0.09 0.00
13 195 3.25 0.5 0.089 0.314 0.080 0.009 0.09 0.00
14 210 3.50 0.5 0.089 0.310 0.080 0.009 0.09 0.00
15 225 3.75 0.5 0.089 0.307 0.080 0.009 0.09 0.00
16 240 4.00 0.6 0.107 0.303 0.097 0.011 0.11 0.00
17 255 4.25 0.6 0.107 0.299 0.097 0.011 0.11 0.00
18 270 4.50 0.7 0.125 0.295 0.113 0.013 0.13 0.00
19 285 4.75 0.7 0.125 0.291 0.113 0.013 0.13 0.00
20 300 5.00 0.8 0.143 0.288 0.129 0.014 0.15 0.00
21 315 5.25 0.6 0.107 0.284 0.097 0.011 0.11 0.00
22 330 5.50 0.7 0.125 0.280 0.113 0.013 0.13 0.00
23 345 5.75 0.8 0.143 0.276 0.129 0.014 0.15 0.00
24 360 6.00 0.8 0.143 0.273 0.129 0.014 0.15 0.00
25 375 6.25 0.9 0.161 0.269 0.145 0.016 0.16 0.00
26 390 6.50 0.9 0.161 0.266 0.145 0.016 0.16 0.00
27 405 6.75 1.0 0.179 0.262 0.161 0.018 0.18 0.00
28 420 7.00 1.0 0.179 0.258 0.161 0.018 0.18 0.00
29 435 7.25 1.0 0.179 0.255 0.161 0.018 0.18 0.00
30 450 7.50 1.1 0.197 0.252 0.177 0.020 0.20 0.00
31 465 7.75 1.2 0.215 0.248 0.193 0.021 0.22 0.00
32 480 8.00 1.3 0.232 0.245 0.209 0.023 0.24 5.05
33 495 8.25 1.5 0.268 0.241 0.241 0.027 0.28 39.29
34 510 8.50 1.5 0.268 0.238 0.241 0.030 0.31 70.31
35 525 8.75 1.6 0.286 0.235 0.257 0.052 0.53 266.00
36 540 9.00 1.7 0.304 0.231 0.274 0.073 0.75 461.42
37 555 9.25 1.9 0.340 0.228 0.306 0.112 1.15 821.51
38 570 9.50 2.0 0.358 0.225 0.322 0.133 1.36 1016.37
39 585 9.75 2.1 0.375 0.222 0.338 0.154 1.58 1210.96
40 600 10.00 2.2 0.393 0.218 0.354 0.175 1.79 1405.26
41 615 10.25 1.5 0.268 0.215 0.241 0.053 0.54 279.74
42 630 10.50 1.5 0.268 0.212 0.241 0.056 0.58 308.53
43 645 10.75 2.0 0.358 0.209 0.322 0.149 1.52 1161.74
44 660 11.00 2.0 0.358 0.206 0.322 0.152 1.55 1189.95
45 675 11.25 1.9 0.340 0.203 0.306 0.137 1.40 1052.92
46 690 11.50 1.9 0.340 0.200 0.306 0.140 1.43 1080.54
47 705 11.75 1.7 0.304 0.197 0.274 0.107 1.10 777.97
48 720 12.00 1.8 0.322 0.194 0.290 0.128 1.31 969.93
49 735 12.25 2.5 0.447 0.191 0.402 0.256 2.62 2151.25
50 750 12.50 2.6 0.465 0.188 0.418 0.277 2.84 2342.59
51 765 12.75 2.8 0.501 0.185 0.451 0.315 3.23 2698.57
52 780 13.00 2.9 0.519 0.183 0.467 0.336 3.44 2889.30
53 795 13.25 3.4 0.608 0.180 0.547 0.428 4.39 3739.48
54 810 13.50 3.4 0.608 0.177 0.547 0.431 4.42 3764.62
55 825 13.75 2.3 0.411 0.174 0.370 0.237 2.43 1975.07
56 840 14.00 2.3 0.411 0.172 0.370 0.239 2.45 1999.56
57 855 14.25 2.7 0.483 0.169 0.434 0.314 3.21 2683.50
58 870 14.50 2.6 0.465 0.167 0.418 0.298 3.06 2542.39
59 885 14.75 2.6 0.465 0.164 0.418 0.301 3.08 2565.88
60 900 15.00 2.5 0.447 0.162 0.402 0.285 2.93 2424.08
61 915 15.25 2.4 0.429 0.159 0.386 0.270 2.77 2281.94
62 930 15.50 2.3 0.411 0.157 0.370 0.255 2.61 2139.45
63 945 15.75 1.9 0.340 0.154 0.306 0.185 1.90 1501.78
64 960 16.00 1.9 0.340 0.152 0.306 0.188 1.93 1523.52
65 975 16.25 0.4 0.072 0.150 0.064 0.007 0.07 0.00
66 990 16.50 0.4 0.072 0.147 0.064 0.007 0.07 0.00
67 1005 16.75 0.3 0.054 0.145 0.048 0.005 0.05 0.00
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
68 1020 17.00 0.3 0.054 0.143 0.048 0.005 0.05 0.00
69 1035 17.25 0.5 0.089 0.141 0.080 0.009 0.09 0.00
70 1050 17.50 0.5 0.089 0.139 0.080 0.009 0.09 0.00
71 1065 17.75 0.5 0.089 0.137 0.080 0.009 0.09 0.00
72 1080 18.00 0.4 0.072 0.134 0.064 0.007 0.07 0.00
73 1095 18.25 0.4 0.072 0.133 0.064 0.007 0.07 0.00
74 1110 18.50 0.4 0.072 0.131 0.064 0.007 0.07 0.00
75 1125 18.75 0.3 0.054 0.129 0.048 0.005 0.05 0.00
76 1140 19.00 0.2 0.036 0.127 0.032 0.004 0.04 0.00
77 1155 19.25 0.3 0.054 0.125 0.048 0.005 0.05 0.00
78 1170 19.50 0.4 0.072 0.123 0.064 0.007 0.07 0.00
79 1185 19.75 0.3 0.054 0.122 0.048 0.005 0.05 0.00
80 1200 20.00 0.2 0.036 0.120 0.032 0.004 0.04 0.00
81 1215 20.25 0.3 0.054 0.118 0.048 0.005 0.05 0.00
82 1230 20.50 0.3 0.054 0.117 0.048 0.005 0.05 0.00
83 1245 20.75 0.3 0.054 0.115 0.048 0.005 0.05 0.00
84 1260 21.00 0.2 0.036 0.114 0.032 0.004 0.04 0.00
85 1275 21.25 0.3 0.054 0.113 0.048 0.005 0.05 0.00
86 1290 21.50 0.2 0.036 0.111 0.032 0.004 0.04 0.00
87 1305 21.75 0.3 0.054 0.110 0.048 0.005 0.05 0.00
88 1320 22.00 0.2 0.036 0.109 0.032 0.004 0.04 0.00
89 1335 22.25 0.3 0.054 0.108 0.048 0.005 0.05 0.00
90 1350 22.50 0.2 0.036 0.107 0.032 0.004 0.04 0.00
91 1365 22.75 0.2 0.036 0.106 0.032 0.004 0.04 0.00
92 1380 23.00 0.2 0.036 0.105 0.032 0.004 0.04 0.00
93 1395 23.25 0.2 0.036 0.104 0.032 0.004 0.04 0.00
94 1410 23.50 0.2 0.036 0.104 0.032 0.004 0.04 0.00
95 1425 23.75 0.2 0.036 0.103 0.032 0.004 0.04 0.00
96 1440 24.00 0.2 0.036 0.103 0.032 0.004 0.04 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.71
FLOOD VOLUME (acft) 1.46
FLOOD VOLUME (cuft) 63525.46
REQUIRED STORAGE (acft) 1.18
REQUIRED STORAGE (cuft) 51340.48
PEAK FLOW (cfs) 4.42
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.23 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.23 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 1.28 384 384 70 314 465.02 314 0.01
2 10 1.28 384 699 70 629 465.04 629 0.01
3 15 0.76 228 857 70 787 465.05 787 0.02
4 20 1.80 541 1,328 70 1,258 465.08 1,258 0.03
5 25 1.80 541 1,799 70 1,729 465.11 1,729 0.04
6 30 2.58 775 2,504 70 2,434 465.15 2,434 0.06
7 35 1.80 541 2,975 70 2,905 465.18 2,905 0.07
8 40 2.58 775 3,681 70 3,611 465.23 3,611 0.08
9 45 2.58 775 4,386 70 4,317 465.27 4,317 0.10
10 50 1.80 541 4,857 70 4,788 465.30 4,788 0.11
11 55 2.06 619 5,406 70 5,337 465.34 5,337 0.12
12 60 2.58 775 6,112 70 6,042 465.38 6,042 0.14
13 65 3.63 1,088 7,131 70 7,061 465.45 7,061 0.16
14 70 3.63 1,088 8,149 70 8,079 465.51 8,079 0.19
15 75 3.63 1,088 9,168 70 9,098 465.58 9,098 0.21
16 80 3.11 932 10,030 70 9,960 465.63 9,960 0.23
17 85 4.67 1,401 11,361 70 11,291 465.71 11,291 0.26
18 90 4.93 1,479 12,771 70 12,701 465.80 12,701 0.29
19 95 4.15 1,245 13,946 70 13,876 465.88 13,876 0.32
20 100 4.93 1,479 15,356 70 15,286 465.97 15,286 0.35
21 105 6.50 1,949 17,235 70 17,165 466.08 17,165 0.39
22 110 5.97 1,792 18,957 70 18,887 466.18 18,887 0.43
23 115 5.45 1,636 20,523 70 20,453 466.27 20,453 0.47
24 120 5.71 1,714 22,168 70 22,098 466.36 22,098 0.51
25 125 5.97 1,792 23,890 70 23,820 466.46 23,820 0.55
26 130 8.84 2,653 26,473 70 26,403 466.61 26,403 0.61
27 135 10.93 3,279 29,682 70 29,612 466.79 29,612 0.68
28 140 7.02 2,105 31,718 70 31,648 466.91 31,648 0.73
29 145 15.62 4,687 36,335 70 36,265 467.16 36,265 0.83
30 150 16.93 5,078 41,343 70 41,273 467.42 41,273 0.95
31 155 19.27 5,782 47,055 70 46,985 467.72 46,985 1.08
32 160 13.28 3,983 50,968 70 50,898 467.93 50,898 1.17
33 165 3.11 932 51,830 70 51,760 467.97 51,760 1.19
34 170 2.58 775 52,536 70 52,466 468.01 52,466 1.20
35 175 2.58 775 53,241 70 53,172 468.04 53,172 1.22
36 180 0.16 47 53,218 70 53,149 468.04 53,149 1.22

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.17 51 51 70 - 465.00 - 0.00
2 10 0.21 62 62 70 - 465.00 - 0.00
3 15 0.21 62 62 70 - 465.00 - 0.00
4 20 0.21 62 62 70 - 465.00 - 0.00
5 25 0.21 62 62 70 - 465.00 - 0.00
6 30 0.28 85 85 70 16 465.00 16 0.00
7 35 0.28 85 101 70 31 465.00 31 0.00
8 40 0.28 85 117 70 47 465.00 47 0.00
9 45 0.28 85 132 70 62 465.00 62 0.00
10 50 0.28 85 148 70 78 465.00 78 0.00
11 55 0.28 85 163 70 94 465.01 94 0.00
12 60 0.63 188 281 70 212 465.01 212 0.00
13 65 0.63 188 400 70 330 465.02 330 0.01
14 70 0.63 188 518 70 448 465.03 448 0.01
15 75 0.63 188 636 70 566 465.04 566 0.01
16 80 0.63 188 754 70 684 465.04 684 0.02
17 85 0.63 188 872 70 803 465.05 803 0.02
18 90 0.63 188 990 70 921 465.06 921 0.02
19 95 0.63 188 1,109 70 1,039 465.07 1,039 0.02
20 100 0.63 188 1,227 70 1,157 465.07 1,157 0.03
21 105 0.63 188 1,345 70 1,275 465.08 1,275 0.03
22 110 0.63 188 1,463 70 1,393 465.09 1,393 0.03
23 115 0.63 188 1,581 70 1,512 465.10 1,512 0.03
24 120 0.97 291 1,802 70 1,732 465.11 1,732 0.04
25 125 0.63 188 1,920 70 1,850 465.12 1,850 0.04
26 130 0.97 291 2,141 70 2,071 465.13 2,071 0.05
27 135 0.97 291 2,362 70 2,292 465.15 2,292 0.05
28 140 0.97 291 2,582 70 2,513 465.16 2,513 0.06
29 145 0.97 291 2,803 70 2,733 465.17 2,733 0.06
30 150 0.97 291 3,024 70 2,954 465.19 2,954 0.07
31 155 0.97 291 3,245 70 3,175 465.20 3,175 0.07
32 160 0.97 291 3,465 70 3,396 465.21 3,396 0.08
33 165 1.31 393 3,789 70 3,719 465.24 3,719 0.09
34 170 1.31 393 4,112 70 4,042 465.26 4,042 0.09
35 175 1.31 393 4,435 70 4,366 465.28 4,366 0.10
36 180 1.31 393 4,759 70 4,689 465.30 4,689 0.11
37 185 1.31 393 5,082 70 5,012 465.32 5,012 0.12
38 190 1.65 496 5,508 70 5,438 465.34 5,438 0.12
39 195 1.65 496 5,934 70 5,864 465.37 5,864 0.13
40 200 1.65 496 6,360 70 6,290 465.40 6,290 0.14
41 205 1.99 598 6,888 70 6,819 465.43 6,819 0.16
42 210 2.34 701 7,519 70 7,450 465.47 7,450 0.17
43 215 2.68 803 8,253 70 8,183 465.52 8,183 0.19
44 220 2.68 803 8,987 70 8,917 465.56 8,917 0.20
45 225 3.02 906 9,823 70 9,753 465.62 9,753 0.22
46 230 3.02 906 10,659 70 10,589 465.67 10,589 0.24
47 235 3.36 1,009 11,598 70 11,528 465.73 11,528 0.26
48 240 3.36 1,009 12,537 70 12,467 465.79 12,467 0.29
49 245 3.70 1,111 13,578 70 13,509 465.85 13,509 0.31
50 250 4.05 1,214 14,722 70 14,652 465.93 14,652 0.34
51 255 4.39 1,316 15,969 70 15,899 466.01 15,899 0.36
52 260 4.73 1,419 17,318 70 17,248 466.08 17,248 0.40
53 265 5.07 1,522 18,770 70 18,700 466.17 18,700 0.43
54 270 5.07 1,522 20,221 70 20,152 466.25 20,152 0.46
55 275 5.41 1,624 21,776 70 21,706 466.34 21,706 0.50

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 5.76 1,727 23,433 70 23,363 466.43 23,363 0.54
57 285 6.10 1,829 25,192 70 25,122 466.53 25,122 0.58
58 290 6.10 1,829 26,952 70 26,882 466.64 26,882 0.62
59 295 6.44 1,932 28,814 70 28,744 466.74 28,744 0.66
60 300 6.78 2,034 30,778 70 30,709 466.86 30,709 0.70
61 305 8.49 2,547 33,256 70 33,186 467.00 33,186 0.76
62 310 10.20 3,060 36,246 70 36,177 467.15 36,177 0.83
63 315 11.23 3,368 39,545 70 39,475 467.33 39,475 0.91
64 320 12.25 3,676 43,151 70 43,081 467.52 43,081 0.99
65 325 13.96 4,189 47,269 70 47,200 467.73 47,200 1.08
66 330 17.04 5,112 52,311 70 52,242 468.00 52,242 1.20
67 335 4.39 1,316 53,558 70 53,488 468.06 53,488 1.23
68 340 0.97 291 53,779 70 53,709 468.07 53,709 1.23
69 345 0.21 62 53,771 70 53,701 468.07 53,701 1.23
70 350 0.17 51 53,752 70 53,682 468.07 53,682 1.23
71 355 0.10 31 53,713 70 53,643 468.06 53,643 1.23
72 360 0.07 21 53,664 70 53,594 468.06 53,594 1.23
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.04 33 33 209 - 465.00 - 0.00
2 30 0.05 49 49 209 - 465.00 - 0.00
3 45 0.05 49 49 209 - 465.00 - 0.00
4 60 0.07 66 66 209 - 465.00 - 0.00
5 75 0.05 49 49 209 - 465.00 - 0.00
6 90 0.05 49 49 209 - 465.00 - 0.00
7 105 0.05 49 49 209 - 465.00 - 0.00
8 120 0.07 66 66 209 - 465.00 - 0.00
9 135 0.07 66 66 209 - 465.00 - 0.00
10 150 0.07 66 66 209 - 465.00 - 0.00
11 165 0.09 82 82 209 - 465.00 - 0.00
12 180 0.09 82 82 209 - 465.00 - 0.00
13 195 0.09 82 82 209 - 465.00 - 0.00
14 210 0.09 82 82 209 - 465.00 - 0.00
15 225 0.09 82 82 209 - 465.00 - 0.00
16 240 0.11 99 99 209 - 465.00 - 0.00
17 255 0.11 99 99 209 - 465.00 - 0.00
18 270 0.13 115 115 209 - 465.00 - 0.00
19 285 0.13 115 115 209 - 465.00 - 0.00
20 300 0.15 132 132 209 - 465.00 - 0.00
21 315 0.11 99 99 209 - 465.00 - 0.00
22 330 0.13 115 115 209 - 465.00 - 0.00
23 345 0.15 132 132 209 - 465.00 - 0.00
24 360 0.15 132 132 209 - 465.00 - 0.00
25 375 0.16 148 148 209 - 465.00 - 0.00
26 390 0.16 148 148 209 - 465.00 - 0.00
27 405 0.18 165 165 209 - 465.00 - 0.00
28 420 0.18 165 165 209 - 465.00 - 0.00
29 435 0.18 165 165 209 - 465.00 - 0.00
30 450 0.20 181 181 209 - 465.00 - 0.00
31 465 0.22 198 198 209 - 465.00 - 0.00
32 480 0.24 214 214 209 5 465.00 5 0.00
33 495 0.28 249 254 209 44 465.00 44 0.00
34 510 0.31 280 324 209 115 465.01 115 0.00
35 525 0.53 475 590 209 381 465.02 381 0.01
36 540 0.75 671 1,051 209 842 465.05 842 0.02
37 555 1.15 1,031 1,873 209 1,664 465.11 1,664 0.04
38 570 1.36 1,226 2,889 209 2,680 465.17 2,680 0.06
39 585 1.58 1,420 4,100 209 3,891 465.25 3,891 0.09
40 600 1.79 1,615 5,506 209 5,296 465.34 5,296 0.12
41 615 0.54 489 5,785 209 5,576 465.35 5,576 0.13
42 630 0.58 518 6,094 209 5,884 465.37 5,884 0.14
43 645 1.52 1,371 7,256 209 7,046 465.45 7,046 0.16
44 660 1.55 1,399 8,446 209 8,236 465.52 8,236 0.19
45 675 1.40 1,262 9,498 209 9,289 465.59 9,289 0.21
46 690 1.43 1,290 10,579 209 10,370 465.66 10,370 0.24
47 705 1.10 987 11,357 209 11,148 465.71 11,148 0.26
48 720 1.31 1,179 12,327 209 12,117 465.77 12,117 0.28
49 735 2.62 2,361 14,478 209 14,269 465.90 14,269 0.33
50 750 2.84 2,552 16,821 209 16,611 466.05 16,611 0.38
51 765 3.23 2,908 19,519 209 19,310 466.20 19,310 0.44
52 780 3.44 3,099 22,409 209 22,199 466.37 22,199 0.51
53 795 4.39 3,949 26,148 209 25,939 466.58 25,939 0.60
54 810 4.42 3,974 29,913 209 29,703 466.80 29,703 0.68
55 825 2.43 2,184 31,888 209 31,678 466.91 31,678 0.73
56 840 2.45 2,209 33,887 209 33,678 467.02 33,678 0.77
57 855 3.21 2,893 36,571 209 36,361 467.16 36,361 0.83
58 870 3.06 2,752 39,113 209 38,904 467.30 38,904 0.89

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 3.08 2,775 41,679 209 41,470 467.43 41,470 0.95
60 900 2.93 2,633 44,103 209 43,894 467.56 43,894 1.01
61 915 2.77 2,491 46,385 209 46,176 467.68 46,176 1.06
62 930 2.61 2,349 48,525 209 48,315 467.79 48,315 1.11
63 945 1.90 1,711 50,026 209 49,817 467.87 49,817 1.14
64 960 1.93 1,733 51,550 209 51,340 467.95 51,340 1.18
65 975 0.07 66 51,406 209 51,197 467.94 51,197 1.18
66 990 0.07 66 51,263 209 51,054 467.93 51,054 1.17
67 1005 0.05 49 51,103 209 50,894 467.92 50,894 1.17
68 1020 0.05 49 50,943 209 50,734 467.92 50,734 1.16
69 1035 0.09 82 50,816 209 50,607 467.91 50,607 1.16
70 1050 0.09 82 50,689 209 50,480 467.90 50,480 1.16
71 1065 0.09 82 50,563 209 50,353 467.90 50,353 1.16
72 1080 0.07 66 50,419 209 50,210 467.89 50,210 1.15
73 1095 0.07 66 50,276 209 50,066 467.88 50,066 1.15
74 1110 0.07 66 50,132 209 49,923 467.87 49,923 1.15
75 1125 0.05 49 49,972 209 49,763 467.87 49,763 1.14
76 1140 0.04 49,796 33 209 49,587 467.86 49,587 1.14
77 1155 0.05 49 49,636 209 49,427 467.85 49,427 1.13
78 1170 0.07 66 49,493 209 49,283 467.84 49,283 1.13
79 1185 0.05 49 49,333 209 49,124 467.83 49,124 1.13
80 1200 0.04 33 49,157 209 48,947 467.82 48,947 1.12
81 1215 0.05 49 48,997 209 48,787 467.81 48,787 1.12
82 1230 0.05 49 48,837 209 48,627 467.81 48,627 1.12
83 1245 0.05 49 48,677 209 48,467 467.80 48,467 1.11
84 1260 0.04 33 48,500 209 48,291 467.79 48,291 1.11
85 1275 0.05 49 48,341 209 48,131 467.78 48,131 1.10
86 1290 0.04 33 48,164 209 47,955 467.77 47,955 1.10
87 1305 0.05 49 48,004 209 47,795 467.76 47,795 1.10
88 1320 0.04 33 47,828 209 47,619 467.75 47,619 1.09
89 1335 0.05 49 47,668 209 47,459 467.75 47,459 1.09
90 1350 0.04 33 47,492 209 47,282 467.74 47,282 1.09
91 1365 0.04 33 47,315 209 47,106 467.73 47,106 1.08
92 1380 0.04 33 47,139 209 46,929 467.72 46,929 1.08
93 1395 0.04 33 46,962 209 46,753 467.71 46,753 1.07
94 1410 0.04 33 46,786 209 46,577 467.70 46,577 1.07
95 1425 0.04 33 46,610 209 46,400 467.69 46,400 1.07
96 1440 0.04 33 46,433 209 46,224 467.68 46,224 1.06
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 4

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 2.33
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 6.56

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 0.9

RETENTION BASIN

GOLF COURSE

POINT RAIN
3-HOUR 2.12
6-HOUR 2.78
24-HOUR 4.47
BASIN CHARACTERISTICS: ELEVATION AREA
464.5 13730
465.5 15200
466.5 16700
467.5 18270
468 19075
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 1050 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

2.12 9.790 1.00 2.12 2.78 9.790 1.00 2.78 4.47 9.790 1.00 4.47

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 9.79 SUM [7] 2.12 SUM [9] 9.79 SUM [11] 2.78 SUM [13] 9.79 SUM [15] 4.47 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 2.12 2.78 4.47
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 1.51 1.59 1.71
FLOOD VOLUME (cu-ft) 53,707 56,587 60,936
(acre-ft) 1.23 1.30 1.40
REQUIRED STORAGE (cu-ft) 50,983 51,654 49,570
(acre-ft) 1.17 1.19 1.14
PEAK FLOW (cfs) 18.42 16.28 4.23
MAXIMUM WSEL (ft) 467.67 467.70 467.59
24-HOURS
[15] LAG TIME-HOURS
[16] LAG TIME-MINUTES

1.4 1.4

2.8 21.3

4.61 0.02

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 4

9.790
620

0.013
470.5
468

0.117

70.00 0.000
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 2.5
[11] S-FEET/MILE
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 100 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

0.00 0.000 0.0000

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS
(24-(T/60))^1.55 +

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 9.79
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.38
UNIT TIME-PERCENT OF LAG 362.1
TOTAL ADJUSTED STORM RAIN-INCHES 2.12
CONSTANT LOSS RATE-in/hr 0.20
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.21 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.331 0.20 0.30 0.13 1.23 306.00
2 10 0.17 1.3 0.331 0.20 0.30 0.13 1.23 306.00
3 15 0.25 1.1 0.280 0.20 0.25 0.08 0.73 156.57
4 20 0.33 1.5 0.382 0.20 0.34 0.18 1.73 455.43
5 25 0.42 1.5 0.382 0.20 0.34 0.18 1.73 455.43
6 30 0.50 1.8 0.458 0.20 0.41 0.25 2.48 679.59
7 35 0.58 1.5 0.382 0.20 0.34 0.18 1.73 455.43
8 40 0.67 1.8 0.458 0.20 0.41 0.25 2.48 679.59
9 45 0.75 1.8 0.458 0.20 0.41 0.25 2.48 679.59
10 50 0.83 1.5 0.382 0.20 0.34 0.18 1.73 455.43
11 55 0.92 1.6 0.407 0.20 0.37 0.20 1.98 530.15
12 60 1.00 1.8 0.458 0.20 0.41 0.25 2.48 679.59
13 65 1.08 2.2 0.560 0.20 0.50 0.35 3.47 978.46
14 70 1.17 2.2 0.560 0.20 0.50 0.35 3.47 978.46
15 75 1.25 2.2 0.560 0.20 0.50 0.35 3.47 978.46
16 80 1.33 2.0 0.509 0.20 0.46 0.30 2.98 829.02
17 85 1.42 2.6 0.661 0.20 0.60 0.46 4.47 1277.32
18 90 1.50 2.7 0.687 0.20 0.62 0.48 4.72 1352.04
19 95 1.58 2.4 0.611 0.20 0.55 0.41 3.97 1127.89
20 100 1.67 2.7 0.687 0.20 0.62 0.48 4.72 1352.04
21 105 1.75 3.3 0.840 0.20 0.76 0.63 6.21 1800.35
22 110 1.83 3.1 0.789 0.20 0.71 0.58 5.72 1650.91
23 115 1.92 2.9 0.738 0.20 0.66 0.53 5.22 1501.48
24 120 2.00 3.0 0.763 0.20 0.69 0.56 5.47 1576.19
25 125 2.08 3.1 0.789 0.20 0.71 0.58 5.72 1650.91
26 130 2.17 4.2 1.068 0.20 0.96 0.86 8.46 2472.80
27 135 2.25 5.0 1.272 0.20 1.14 1.07 10.45 3070.54
28 140 2.33 3.5 0.890 0.20 0.80 0.69 6.71 1949.78
29 145 2.42 6.8 1.730 0.20 1.56 1.53 14.93 4415.45
30 150 2.50 7.3 1.857 0.20 1.67 1.65 16.18 4789.04
31 155 2.58 8.2 2.086 0.20 1.88 1.88 18.42 5461.49
32 160 2.67 5.9 1.501 0.20 1.35 1.30 12.69 3742.99
33 165 2.75 2.0 0.509 0.20 0.46 0.30 2.98 829.02
34 170 2.83 1.8 0.458 0.20 0.41 0.25 2.48 679.59
35 175 2.92 1.8 0.458 0.20 0.41 0.25 2.48 679.59
36 180 3.00 0.6 0.153 0.20 0.14 0.02 0.15 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.51
FLOOD VOLUME (acft) 1.23
FLOOD VOLUME (cuft) 53707.39
REQUIRED STORAGE (acft) 1.17
REQUIRED STORAGE (cuft) 50982.60
PEAK FLOW RATE (cfs) 18.42
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.79
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 1.38
UNIT TIME-PERCENT OF LAG 362.1
TOTAL ADJUSTED STORM RAIN-INCHES 2.78
CONSTANT LOSS RATE-in/hr 0.205
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.21 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.167 0.20 0.15 0.02 0.16 0.00
2 10 0.17 0.6 0.200 0.20 0.18 0.02 0.20 0.00
3 15 0.25 0.6 0.200 0.20 0.18 0.02 0.20 0.00
4 20 0.33 0.6 0.200 0.20 0.18 0.02 0.20 0.00
5 25 0.42 0.6 0.200 0.20 0.18 0.02 0.20 0.00
6 30 0.50 0.7 0.234 0.20 0.21 0.03 0.28 20.52
7 35 0.58 0.7 0.234 0.20 0.21 0.03 0.28 20.52
8 40 0.67 0.7 0.234 0.20 0.21 0.03 0.28 20.52
9 45 0.75 0.7 0.234 0.20 0.21 0.03 0.28 20.52
10 50 0.83 0.7 0.234 0.20 0.21 0.03 0.28 20.52
11 55 0.92 0.7 0.234 0.20 0.21 0.03 0.28 20.52
12 60 1.00 0.8 0.267 0.20 0.24 0.06 0.61 118.50
13 65 1.08 0.8 0.267 0.20 0.24 0.06 0.61 118.50
14 70 1.17 0.8 0.267 0.20 0.24 0.06 0.61 118.50
15 75 1.25 0.8 0.267 0.20 0.24 0.06 0.61 118.50
16 80 1.33 0.8 0.267 0.20 0.24 0.06 0.61 118.50
17 85 1.42 0.8 0.267 0.20 0.24 0.06 0.61 118.50
18 90 1.50 0.8 0.267 0.20 0.24 0.06 0.61 118.50
19 95 1.58 0.8 0.267 0.20 0.24 0.06 0.61 118.50
20 100 1.67 0.8 0.267 0.20 0.24 0.06 0.61 118.50
21 105 1.75 0.8 0.267 0.20 0.24 0.06 0.61 118.50
22 110 1.83 0.8 0.267 0.20 0.24 0.06 0.61 118.50
23 115 1.92 0.8 0.267 0.20 0.24 0.06 0.61 118.50
24 120 2.00 0.9 0.300 0.20 0.27 0.10 0.93 216.48
25 125 2.08 0.8 0.267 0.20 0.24 0.06 0.61 118.50
26 130 2.17 0.9 0.300 0.20 0.27 0.10 0.93 216.48
27 135 2.25 0.9 0.300 0.20 0.27 0.10 0.93 216.48
28 140 2.33 0.9 0.300 0.20 0.27 0.10 0.93 216.48
29 145 2.42 0.9 0.300 0.20 0.27 0.10 0.93 216.48
30 150 2.50 0.9 0.300 0.20 0.27 0.10 0.93 216.48
31 155 2.58 0.9 0.300 0.20 0.27 0.10 0.93 216.48
32 160 2.67 0.9 0.300 0.20 0.27 0.10 0.93 216.48
33 165 2.75 1.0 0.334 0.20 0.30 0.13 1.26 314.46
34 170 2.83 1.0 0.334 0.20 0.30 0.13 1.26 314.46
35 175 2.92 1.0 0.334 0.20 0.30 0.13 1.26 314.46
36 180 3.00 1.0 0.334 0.20 0.30 0.13 1.26 314.46
37 185 3.08 1.0 0.334 0.20 0.30 0.13 1.26 314.46
38 190 3.17 1.1 0.367 0.20 0.33 0.16 1.59 412.44
39 195 3.25 1.1 0.367 0.20 0.33 0.16 1.59 412.44
40 200 3.33 1.1 0.367 0.20 0.33 0.16 1.59 412.44
41 205 3.42 1.2 0.400 0.20 0.36 0.20 1.91 510.41
42 210 3.50 1.3 0.434 0.20 0.39 0.23 2.24 608.39
43 215 3.58 1.4 0.467 0.20 0.42 0.26 2.57 706.37
44 220 3.67 1.4 0.467 0.20 0.42 0.26 2.57 706.37
45 225 3.75 1.5 0.500 0.20 0.45 0.30 2.89 804.35
46 230 3.83 1.5 0.500 0.20 0.45 0.30 2.89 804.35
47 235 3.92 1.6 0.534 0.20 0.48 0.33 3.22 902.33
48 240 4.00 1.6 0.534 0.20 0.48 0.33 3.22 902.33
49 245 4.08 1.7 0.567 0.20 0.51 0.36 3.55 1000.31
50 250 4.17 1.8 0.600 0.20 0.54 0.40 3.87 1098.28
51 255 4.25 1.9 0.634 0.20 0.57 0.43 4.20 1196.26
52 260 4.33 2.0 0.667 0.20 0.60 0.46 4.53 1294.24
53 265 4.42 2.1 0.701 0.20 0.63 0.50 4.85 1392.22
54 270 4.50 2.1 0.701 0.20 0.63 0.50 4.85 1392.22
55 275 4.58 2.2 0.734 0.20 0.66 0.53 5.18 1490.20
56 280 4.67 2.3 0.767 0.20 0.69 0.56 5.51 1588.18

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
57 285 4.75 2.4 0.801 0.20 0.72 0.60 5.83 1686.15
58 290 4.83 2.4 0.801 0.20 0.72 0.60 5.83 1686.15
59 295 4.92 2.5 0.834 0.20 0.75 0.63 6.16 1784.13
60 300 5.00 2.6 0.867 0.20 0.78 0.66 6.49 1882.11
61 305 5.08 3.1 1.034 0.20 0.93 0.83 8.12 2372.00
62 310 5.17 3.6 1.201 0.20 1.08 1.00 9.75 2861.89
63 315 5.25 3.9 1.301 0.20 1.17 1.10 10.73 3155.83
64 320 5.33 4.2 1.401 0.20 1.26 1.20 11.71 3449.76
65 325 5.42 4.7 1.568 0.20 1.41 1.36 13.35 3939.66
66 330 5.50 5.6 1.868 0.20 1.68 1.66 16.28 4821.46
67 335 5.58 1.9 0.634 0.20 0.57 0.43 4.20 1196.26
68 340 5.67 0.9 0.300 0.20 0.27 0.10 0.93 216.48
69 345 5.75 0.6 0.200 0.20 0.18 0.02 0.20 0.00
70 350 5.83 0.5 0.167 0.20 0.15 0.02 0.16 0.00
71 355 5.92 0.3 0.100 0.20 0.09 0.01 0.10 0.00
72 360 6.00 0.2 0.067 0.20 0.06 0.01 0.07 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.59
FLOOD VOLUME (acft) 1.30
FLOOD VOLUME (cuft) 56587.21
REQUIRED STORAGE (acft) 1.19
REQUIRED STORAGE (cuft) 51653.82
PEAK FLOW RATE (cfs) 16.28
Plate E-2.2

Page 6 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.790 CONSTANT LOSS RATE-in/hr n/a
UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2048 LAG TIME - MINUTES 1.38 MINIMUM LOSS RATE (for var. loss) - in/hr 0.102 UNIT TIME-PERCENT OF LAG 1086.4 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN-INCHES 4.47 C 0.00190
PERCOLATION RATE (cfs) 0.21
Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 15 0.25 0.2 0.036 0.362 0.032 0.004 0.04 0.00
2 30 0.50 0.3 0.054 0.357 0.048 0.005 0.05 0.00
3 45 0.75 0.3 0.054 0.353 0.048 0.005 0.05 0.00
4 60 1.00 0.4 0.072 0.349 0.064 0.007 0.07 0.00
5 75 1.25 0.3 0.054 0.345 0.048 0.005 0.05 0.00
6 90 1.50 0.3 0.054 0.341 0.048 0.005 0.05 0.00
7 105 1.75 0.3 0.054 0.337 0.048 0.005 0.05 0.00
8 120 2.00 0.4 0.072 0.333 0.064 0.007 0.07 0.00
9 135 2.25 0.4 0.072 0.329 0.064 0.007 0.07 0.00
10 150 2.50 0.4 0.072 0.325 0.064 0.007 0.07 0.00
11 165 2.75 0.5 0.089 0.321 0.080 0.009 0.09 0.00
12 180 3.00 0.5 0.089 0.317 0.080 0.009 0.09 0.00
13 195 3.25 0.5 0.089 0.313 0.080 0.009 0.09 0.00
14 210 3.50 0.5 0.089 0.309 0.080 0.009 0.09 0.00
15 225 3.75 0.5 0.089 0.305 0.080 0.009 0.09 0.00
16 240 4.00 0.6 0.107 0.301 0.097 0.011 0.11 0.00
17 255 4.25 0.6 0.107 0.297 0.097 0.011 0.11 0.00
18 270 4.50 0.7 0.125 0.294 0.113 0.013 0.12 0.00
19 285 4.75 0.7 0.125 0.290 0.113 0.013 0.12 0.00
20 300 5.00 0.8 0.143 0.286 0.129 0.014 0.14 0.00
21 315 5.25 0.6 0.107 0.282 0.097 0.011 0.11 0.00
22 330 5.50 0.7 0.125 0.279 0.113 0.013 0.12 0.00
23 345 5.75 0.8 0.143 0.275 0.129 0.014 0.14 0.00
24 360 6.00 0.8 0.143 0.272 0.129 0.014 0.14 0.00
25 375 6.25 0.9 0.161 0.268 0.145 0.016 0.16 0.00
26 390 6.50 0.9 0.161 0.264 0.145 0.016 0.16 0.00
27 405 6.75 1.0 0.179 0.261 0.161 0.018 0.18 0.00
28 420 7.00 1.0 0.179 0.257 0.161 0.018 0.18 0.00
29 435 7.25 1.0 0.179 0.254 0.161 0.018 0.18 0.00
30 450 7.50 1.1 0.197 0.250 0.177 0.020 0.19 0.00
31 465 7.75 1.2 0.215 0.247 0.193 0.021 0.21 0.00
32 480 8.00 1.3 0.232 0.243 0.209 0.023 0.23 13.15
33 495 8.25 1.5 0.268 0.240 0.241 0.028 0.28 55.92
34 510 8.50 1.5 0.268 0.237 0.241 0.031 0.31 85.41
35 525 8.75 1.6 0.286 0.233 0.257 0.053 0.52 272.18
36 540 9.00 1.7 0.304 0.230 0.274 0.074 0.72 458.69
37 555 9.25 1.9 0.340 0.227 0.306 0.113 1.10 802.48
38 570 9.50 2.0 0.358 0.224 0.322 0.134 1.31 988.46
39 585 9.75 2.1 0.375 0.220 0.338 0.155 1.52 1174.18
40 600 10.00 2.2 0.393 0.217 0.354 0.176 1.72 1359.63
41 615 10.25 1.5 0.268 0.214 0.241 0.054 0.53 284.49
42 630 10.50 1.5 0.268 0.211 0.241 0.057 0.56 311.86
43 645 10.75 2.0 0.358 0.208 0.322 0.150 1.46 1126.65
44 660 11.00 2.0 0.358 0.205 0.322 0.153 1.49 1153.47
45 675 11.25 1.9 0.340 0.202 0.306 0.138 1.35 1022.46
46 690 11.50 1.9 0.340 0.199 0.306 0.141 1.38 1048.71
47 705 11.75 1.7 0.304 0.196 0.274 0.108 1.06 759.60
48 720 12.00 1.8 0.322 0.193 0.290 0.129 1.26 942.83
49 735 12.25 2.5 0.447 0.190 0.402 0.257 2.51 2071.00
50 750 12.50 2.6 0.465 0.187 0.418 0.278 2.72 2253.64
51 765 12.75 2.8 0.501 0.185 0.451 0.316 3.09 2593.53
52 780 13.00 2.9 0.519 0.182 0.467 0.337 3.30 2775.58
53 795 13.25 3.4 0.608 0.179 0.547 0.429 4.20 3587.49
54 810 13.50 3.4 0.608 0.176 0.547 0.432 4.23 3611.39
55 825 13.75 2.3 0.411 0.174 0.370 0.238 2.33 1902.04
56 840 14.00 2.3 0.411 0.171 0.370 0.240 2.35 1925.32
57 855 14.25 2.7 0.483 0.168 0.434 0.314 3.08 2578.46
58 870 14.50 2.6 0.465 0.166 0.418 0.299 2.93 2443.57
59 885 14.75 2.6 0.465 0.163 0.418 0.302 2.95 2465.90
60 900 15.00 2.5 0.447 0.161 0.402 0.286 2.80 2330.36
61 915 15.25 2.4 0.429 0.158 0.386 0.271 2.65 2194.50
62 930 15.50 2.3 0.411 0.156 0.370 0.255 2.50 2058.30
63 945 15.75 1.9 0.340 0.153 0.306 0.186 1.82 1449.14
64 960 16.00 1.9 0.340 0.151 0.306 0.189 1.85 1469.81
65 975 16.25 0.4 0.072 0.149 0.064 0.007 0.07 0.00
66 990 16.50 0.4 0.072 0.147 0.064 0.007 0.07 0.00
67 1005 16.75 0.3 0.054 0.144 0.048 0.005 0.05 0.00
Time Loss Rate
in/hr

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 7 of 14 ends

Item 33.

EFFECTIVE RAIN CALCULATION FORM
68 1020 17.00 0.3 0.054 0.142 0.048 0.005 0.05 0.00
69 1035 17.25 0.5 0.089 0.140 0.080 0.009 0.09 0.00
70 1050 17.50 0.5 0.089 0.138 0.080 0.009 0.09 0.00
71 1065 17.75 0.5 0.089 0.136 0.080 0.009 0.09 0.00
72 1080 18.00 0.4 0.072 0.134 0.064 0.007 0.07 0.00
73 1095 18.25 0.4 0.072 0.132 0.064 0.007 0.07 0.00
74 1110 18.50 0.4 0.072 0.130 0.064 0.007 0.07 0.00
75 1125 18.75 0.3 0.054 0.128 0.048 0.005 0.05 0.00
76 1140 19.00 0.2 0.036 0.126 0.032 0.004 0.04 0.00
77 1155 19.25 0.3 0.054 0.124 0.048 0.005 0.05 0.00
78 1170 19.50 0.4 0.072 0.123 0.064 0.007 0.07 0.00
79 1185 19.75 0.3 0.054 0.121 0.048 0.005 0.05 0.00
80 1200 20.00 0.2 0.036 0.119 0.032 0.004 0.04 0.00
81 1215 20.25 0.3 0.054 0.118 0.048 0.005 0.05 0.00
82 1230 20.50 0.3 0.054 0.116 0.048 0.005 0.05 0.00
83 1245 20.75 0.3 0.054 0.115 0.048 0.005 0.05 0.00
84 1260 21.00 0.2 0.036 0.113 0.032 0.004 0.04 0.00
85 1275 21.25 0.3 0.054 0.112 0.048 0.005 0.05 0.00
86 1290 21.50 0.2 0.036 0.111 0.032 0.004 0.04 0.00
87 1305 21.75 0.3 0.054 0.110 0.048 0.005 0.05 0.00
88 1320 22.00 0.2 0.036 0.108 0.032 0.004 0.04 0.00
89 1335 22.25 0.3 0.054 0.107 0.048 0.005 0.05 0.00
90 1350 22.50 0.2 0.036 0.106 0.032 0.004 0.04 0.00
91 1365 22.75 0.2 0.036 0.105 0.032 0.004 0.04 0.00
92 1380 23.00 0.2 0.036 0.105 0.032 0.004 0.04 0.00
93 1395 23.25 0.2 0.036 0.104 0.032 0.004 0.04 0.00
94 1410 23.50 0.2 0.036 0.103 0.032 0.004 0.04 0.00
95 1425 23.75 0.2 0.036 0.103 0.032 0.004 0.04 0.00
96 1440 24.00 0.2 0.036 0.102 0.032 0.004 0.04 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.71
FLOOD VOLUME (acft) 1.40
FLOOD VOLUME (cuft) 60935.59
REQUIRED STORAGE (acft) 1.14
REQUIRED STORAGE (cuft) 49570.20
PEAK FLOW (cfs) 4.23
Plate E-2.2

Page 8 of 14 ends

Item 33.

PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB # 0
1 BASIN CHARACTERISTICS

CONTOUR DEPTH AREA VOLUME

PERCOLATION CALCULATIONS
PERCOLATION RATE 0.67 in/hr 0.21 cfs

MAXWELL IV DRYWELLS
NUMBER USED 0
RATE/DRYWELL 0 cfs
TOTAL DISSIPATED 0 cfs
TOTAL PERCOLATION RATE 0.21 cfs
Basin Characteristics

Page 9 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 3 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 1.23 370 370 64 306 464.52 306 0.01
2 10 1.23 370 676 64 612 464.54 612 0.01
3 15 0.73 220 832 64 769 464.55 769 0.02
4 20 1.73 519 1,288 64 1,224 464.58 1,224 0.03
5 25 1.73 519 1,743 64 1,679 464.62 1,679 0.04
6 30 2.48 743 2,423 64 2,359 464.66 2,359 0.05
7 35 1.73 519 2,878 64 2,814 464.69 2,814 0.06
8 40 2.48 743 3,558 64 3,494 464.74 3,494 0.08
9 45 2.48 743 4,238 64 4,174 464.79 4,174 0.10
10 50 1.73 519 4,693 64 4,629 464.82 4,629 0.11
11 55 1.98 594 5,223 64 5,159 464.86 5,159 0.12
12 60 2.48 743 5,903 64 5,839 464.90 5,839 0.13
13 65 3.47 1,042 6,881 64 6,817 464.97 6,817 0.16
14 70 3.47 1,042 7,860 64 7,796 465.04 7,796 0.18
15 75 3.47 1,042 8,838 64 8,774 465.11 8,774 0.20
16 80 2.98 893 9,667 64 9,603 465.16 9,603 0.22
17 85 4.47 1,341 10,944 64 10,881 465.25 10,881 0.25
18 90 4.72 1,416 12,296 64 12,233 465.35 12,233 0.28
19 95 3.97 1,192 13,424 64 13,360 465.42 13,360 0.31
20 100 4.72 1,416 14,776 64 14,712 465.52 14,712 0.34
21 105 6.21 1,864 16,577 64 16,513 465.63 16,513 0.38
22 110 5.72 1,715 18,228 64 18,164 465.73 18,164 0.42
23 115 5.22 1,565 19,729 64 19,665 465.83 19,665 0.45
24 120 5.47 1,640 21,305 64 21,241 465.92 21,241 0.49
25 125 5.72 1,715 22,956 64 22,892 466.03 22,892 0.53
26 130 8.46 2,537 25,429 64 25,365 466.18 25,365 0.58
27 135 10.45 3,134 28,500 64 28,436 466.38 28,436 0.65
28 140 6.71 2,014 30,449 64 30,385 466.50 30,385 0.70
29 145 14.93 4,479 34,865 64 34,801 466.75 34,801 0.80
30 150 16.18 4,853 39,654 64 39,590 467.02 39,590 0.91
31 155 18.42 5,525 45,115 64 45,051 467.34 45,051 1.03
32 160 12.69 3,807 48,858 64 48,794 467.55 48,794 1.12
33 165 2.98 893 49,687 64 49,623 467.59 49,623 1.14
34 170 2.48 743 50,367 64 50,303 467.63 50,303 1.15
35 175 2.48 743 51,046 64 50,983 467.67 50,983 1.17
36 180 0.15 45 51,027 64 50,964 467.66 50,964 1.17

BALANCE IN
BASIN
TIME
Basin Depth Analysis

Page 10 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 5 0.16 49 49 64 - 464.50 - 0.00
2 10 0.20 59 59 64 - 464.50 - 0.00
3 15 0.20 59 59 64 - 464.50 - 0.00
4 20 0.20 59 59 64 - 464.50 - 0.00
5 25 0.20 59 59 64 - 464.50 - 0.00
6 30 0.28 84 84 64 21 464.50 21 0.00
7 35 0.28 84 105 64 41 464.50 41 0.00
8 40 0.28 84 125 64 62 464.50 62 0.00
9 45 0.28 84 146 64 82 464.51 82 0.00
10 50 0.28 84 166 64 103 464.51 103 0.00
11 55 0.28 84 187 64 123 464.51 123 0.00
12 60 0.61 182 306 64 242 464.52 242 0.01
13 65 0.61 182 424 64 360 464.52 360 0.01
14 70 0.61 182 543 64 479 464.53 479 0.01
15 75 0.61 182 661 64 597 464.54 597 0.01
16 80 0.61 182 780 64 716 464.55 716 0.02
17 85 0.61 182 898 64 834 464.56 834 0.02
18 90 0.61 182 1,017 64 953 464.57 953 0.02
19 95 0.61 182 1,135 64 1,071 464.57 1,071 0.02
20 100 0.61 182 1,254 64 1,190 464.58 1,190 0.03
21 105 0.61 182 1,372 64 1,308 464.59 1,308 0.03
22 110 0.61 182 1,491 64 1,427 464.60 1,427 0.03
23 115 0.61 182 1,609 64 1,545 464.61 1,545 0.04
24 120 0.93 280 1,826 64 1,762 464.62 1,762 0.04
25 125 0.61 182 1,944 64 1,880 464.63 1,880 0.04
26 130 0.93 280 2,161 64 2,097 464.64 2,097 0.05
27 135 0.93 280 2,377 64 2,313 464.66 2,313 0.05
28 140 0.93 280 2,593 64 2,530 464.67 2,530 0.06
29 145 0.93 280 2,810 64 2,746 464.69 2,746 0.06
30 150 0.93 280 3,026 64 2,963 464.70 2,963 0.07
31 155 0.93 280 3,243 64 3,179 464.72 3,179 0.07
32 160 0.93 280 3,459 64 3,395 464.73 3,395 0.08
33 165 1.26 378 3,774 64 3,710 464.76 3,710 0.09
34 170 1.26 378 4,088 64 4,024 464.78 4,024 0.09
35 175 1.26 378 4,403 64 4,339 464.80 4,339 0.10
36 180 1.26 378 4,717 64 4,653 464.82 4,653 0.11
37 185 1.26 378 5,032 64 4,968 464.84 4,968 0.11
38 190 1.59 476 5,444 64 5,380 464.87 5,380 0.12
39 195 1.59 476 5,857 64 5,793 464.90 5,793 0.13
40 200 1.59 476 6,269 64 6,205 464.93 6,205 0.14
41 205 1.91 574 6,779 64 6,716 464.96 6,716 0.15
42 210 2.24 672 7,388 64 7,324 465.01 7,324 0.17
43 215 2.57 770 8,094 64 8,030 465.06 8,030 0.18
44 220 2.57 770 8,801 64 8,737 465.10 8,737 0.20
45 225 2.89 868 9,605 64 9,541 465.16 9,541 0.22
46 230 2.89 868 10,409 64 10,345 465.22 10,345 0.24
47 235 3.22 966 11,312 64 11,248 465.28 11,248 0.26
48 240 3.22 966 12,214 64 12,150 465.34 12,150 0.28
49 245 3.55 1,064 13,214 64 13,150 465.41 13,150 0.30
50 250 3.87 1,162 14,312 64 14,249 465.49 14,249 0.33
51 255 4.20 1,260 15,509 64 15,445 465.56 15,445 0.35
52 260 4.53 1,358 16,803 64 16,739 465.64 16,739 0.38
53 265 4.85 1,456 18,195 64 18,131 465.73 18,131 0.42
54 270 4.85 1,456 19,587 64 19,524 465.82 19,524 0.45
55 275 5.18 1,554 21,078 64 21,014 465.91 21,014 0.48

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 11 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 6 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
56 280 5.51 1,652 22,666 64 22,602 466.01 22,602 0.52
57 285 5.83 1,750 24,352 64 24,288 466.12 24,288 0.56
58 290 5.83 1,750 26,038 64 25,974 466.22 25,974 0.60
59 295 6.16 1,848 27,822 64 27,758 466.33 27,758 0.64
60 300 6.49 1,946 29,704 64 29,640 466.45 29,640 0.68
61 305 8.12 2,436 32,076 64 32,012 466.59 32,012 0.73
62 310 9.75 2,926 34,938 64 34,874 466.76 34,874 0.80
63 315 10.73 3,220 38,094 64 38,030 466.94 38,030 0.87
64 320 11.71 3,514 41,544 64 41,480 467.13 41,480 0.95
65 325 13.35 4,004 45,483 64 45,420 467.36 45,420 1.04
66 330 16.28 4,885 50,305 64 50,241 467.63 50,241 1.15
67 335 4.20 1,260 51,501 64 51,437 467.69 51,437 1.18
68 340 0.93 280 51,718 64 51,654 467.70 51,654 1.19
69 345 0.20 59 51,713 64 51,649 467.70 51,649 1.19
70 350 0.16 49 51,698 64 51,634 467.70 51,634 1.19
71 355 0.10 29 51,663 64 51,599 467.70 51,599 1.18
72 360 0.07 20 51,619 64 51,555 467.70 51,555 1.18
Basin Depth Analysis

Page 12 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft) 1 15 0.04 32 32 192 - 464.50 - 0.00
2 30 0.05 47 47 192 - 464.50 - 0.00
3 45 0.05 47 47 192 - 464.50 - 0.00
4 60 0.07 63 63 192 - 464.50 - 0.00
5 75 0.05 47 47 192 - 464.50 - 0.00
6 90 0.05 47 47 192 - 464.50 - 0.00
7 105 0.05 47 47 192 - 464.50 - 0.00
8 120 0.07 63 63 192 - 464.50 - 0.00
9 135 0.07 63 63 192 - 464.50 - 0.00
10 150 0.07 63 63 192 - 464.50 - 0.00
11 165 0.09 79 79 192 - 464.50 - 0.00
12 180 0.09 79 79 192 - 464.50 - 0.00
13 195 0.09 79 79 192 - 464.50 - 0.00
14 210 0.09 79 79 192 - 464.50 - 0.00
15 225 0.09 79 79 192 - 464.50 - 0.00
16 240 0.11 95 95 192 - 464.50 - 0.00
17 255 0.11 95 95 192 - 464.50 - 0.00
18 270 0.12 110 110 192 - 464.50 - 0.00
19 285 0.12 110 110 192 - 464.50 - 0.00
20 300 0.14 126 126 192 - 464.50 - 0.00
21 315 0.11 95 95 192 - 464.50 - 0.00
22 330 0.12 110 110 192 - 464.50 - 0.00
23 345 0.14 126 126 192 - 464.50 - 0.00
24 360 0.14 126 126 192 - 464.50 - 0.00
25 375 0.16 142 142 192 - 464.50 - 0.00
26 390 0.16 142 142 192 - 464.50 - 0.00
27 405 0.18 158 158 192 - 464.50 - 0.00
28 420 0.18 158 158 192 - 464.50 - 0.00
29 435 0.18 158 158 192 - 464.50 - 0.00
30 450 0.19 173 173 192 - 464.50 - 0.00
31 465 0.21 189 189 192 - 464.50 - 0.00
32 480 0.23 205 205 192 13 464.50 13 0.00
33 495 0.28 248 261 192 69 464.50 69 0.00
34 510 0.31 277 346 192 154 464.51 154 0.00
35 525 0.52 464 618 192 427 464.53 427 0.01
36 540 0.72 650 1,077 192 885 464.56 885 0.02
37 555 1.10 994 1,879 192 1,688 464.62 1,688 0.04
38 570 1.31 1,180 2,868 192 2,676 464.69 2,676 0.06
39 585 1.52 1,366 4,042 192 3,850 464.77 3,850 0.09
40 600 1.72 1,551 5,402 192 5,210 464.86 5,210 0.12
41 615 0.53 476 5,686 192 5,495 464.88 5,495 0.13
42 630 0.56 504 5,998 192 5,806 464.90 5,806 0.13
43 645 1.46 1,318 7,125 192 6,933 464.98 6,933 0.16
44 660 1.49 1,345 8,278 192 8,087 465.06 8,087 0.19
45 675 1.35 1,214 9,301 192 9,109 465.13 9,109 0.21
46 690 1.38 1,240 10,349 192 10,158 465.20 10,158 0.23
47 705 1.06 951 11,109 192 10,917 465.25 10,917 0.25
48 720 1.26 1,134 12,052 192 11,860 465.32 11,860 0.27
49 735 2.51 2,263 14,123 192 13,931 465.46 13,931 0.32
50 750 2.72 2,445 16,376 192 16,185 465.61 16,185 0.37
51 765 3.09 2,785 18,970 192 18,778 465.77 18,778 0.43
52 780 3.30 2,967 21,746 192 21,554 465.94 21,554 0.49
53 795 4.20 3,779 25,333 192 25,141 466.17 25,141 0.58
54 810 4.23 3,803 28,944 192 28,753 466.40 28,753 0.66
55 825 2.33 2,094 30,846 192 30,655 466.51 30,655 0.70
56 840 2.35 2,117 32,772 192 32,580 466.62 32,580 0.75
57 855 3.08 2,770 35,350 192 35,159 466.77 35,159 0.81
58 870 2.93 2,635 37,794 192 37,602 466.91 37,602 0.86

TIME BALANCE IN
BASIN
Basin Depth Analysis

Page 13 of 14 ends

Item 33.
1 JOB # 0
100 YEAR - 24 HOUR STORM EVENT

FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN
UNIT (min) IN IN BASIN OUT BASIN DEPTH
PERIOD (cfs) (cuft) (cuft) (cuft) (cuft) (ft) (cuft) (acre-ft)

TIME BALANCE IN
BASIN
59 885 2.95 2,658 40,260 192 40,068 467.05 40,068 0.92
60 900 2.80 2,522 42,590 192 42,398 467.19 42,398 0.97
61 915 2.65 2,386 44,785 192 44,593 467.31 44,593 1.02
62 930 2.50 2,250 46,843 192 46,651 467.43 46,651 1.07
63 945 1.82 1,641 48,292 192 48,100 467.51 48,100 1.10
64 960 1.85 1,661 49,762 192 49,570 467.59 49,570 1.14
65 975 0.07 63 49,633 192 49,442 467.58 49,442 1.14
66 990 0.07 63 49,505 192 49,313 467.58 49,313 1.13
67 1005 0.05 47 49,360 192 49,169 467.57 49,169 1.13
68 1020 0.05 47 49,216 192 49,024 467.56 49,024 1.13
69 1035 0.09 79 49,103 192 48,911 467.55 48,911 1.12
70 1050 0.09 79 48,990 192 48,798 467.55 48,798 1.12
71 1065 0.09 79 48,877 192 48,686 467.54 48,686 1.12
72 1080 0.07 63 48,749 192 48,557 467.54 48,557 1.11
73 1095 0.07 63 48,620 192 48,428 467.53 48,428 1.11
74 1110 0.07 63 48,491 192 48,300 467.52 48,300 1.11
75 1125 0.05 47 48,347 192 48,155 467.51 48,155 1.11
76 1140 0.04 48,187 32 192 47,995 467.51 47,995 1.10
77 1155 0.05 47 48,042 192 47,851 467.50 47,851 1.10
78 1170 0.07 63 47,914 192 47,722 467.49 47,722 1.10
79 1185 0.05 47 47,769 192 47,578 467.48 47,578 1.09
80 1200 0.04 32 47,609 192 47,418 467.47 47,418 1.09
81 1215 0.05 47 47,465 192 47,273 467.46 47,273 1.09
82 1230 0.05 47 47,320 192 47,129 467.46 47,129 1.08
83 1245 0.05 47 47,176 192 46,984 467.45 46,984 1.08
84 1260 0.04 32 47,016 192 46,824 467.44 46,824 1.07
85 1275 0.05 47 46,872 192 46,680 467.43 46,680 1.07
86 1290 0.04 32 46,711 192 46,520 467.42 46,520 1.07
87 1305 0.05 47 46,567 192 46,375 467.41 46,375 1.06
88 1320 0.04 32 46,407 192 46,215 467.40 46,215 1.06
89 1335 0.05 47 46,262 192 46,071 467.40 46,071 1.06
90 1350 0.04 32 46,102 192 45,911 467.39 45,911 1.05
91 1365 0.04 32 45,942 192 45,751 467.38 45,751 1.05
92 1380 0.04 32 45,782 192 45,590 467.37 45,590 1.05
93 1395 0.04 32 45,622 192 45,430 467.36 45,430 1.04
94 1410 0.04 32 45,462 192 45,270 467.35 45,270 1.04
95 1425 0.04 32 45,302 192 45,110 467.34 45,110 1.04
96 1440 0.04 32 45,142 192 44,950 467.33 44,950 1.03
Basin Depth Analysis

Page 14 of 14 ends

Item 33.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
AB C D

RCFCD SYNTHETIC UNIT HYDROGRAPH

DATA INPUT SHEET
WORKSHEET PREPARED BY: JAMES R. BAZUA, P.E.

PROJECT NAME CALHOUN AT AVENUE 49 - 100 YEAR EVENT
JOB #
CONCENTRATION POINT DESIGNATION 1
AREA DESIGNATION SUBAREA 5

TRIBUTARY AREAS ACRES

COMMERCIAL
PAVING/HARDSCAPE 1.95
SF - 1 ACRE
SF - 1/2 ACRE
SF - 1/4 ACRE
MF - CONDOMINIUMS 4.71

MF - APARTMENTS

MOBILE HOME PARK
LANDSCAPING 2.83

RETENTION BASIN

GOLF COURSE

POINT RAIN
3-HOUR 2.12
6-HOUR 2.78
24-HOUR 4.47
BASIN CHARACTERISTICS: ELEVATION AREA
463.5 17610
464.5 19400
465.5 21240
466.5 23140
467 24110
PERCOLATION RATE (in/hr) 0.67

DRYWELL DATA

NUMBER USED
PERCOLATION RATE (cfs)

Page 1064 ends

Item 33.

POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE

RAIN POINT RAIN POINT RAIN POINT

INCHES RAIN INCHES RAIN INCHES RAIN
(Plate E-5.2) INCHES (Plate E-5.4) INCHES (Plate E-5.6) INCHES

2.12 9.490 1.00 2.12 2.78 9.490 1.00 2.78 4.47 9.490 1.00 4.47

0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00
SUM [5] 9.49 SUM [7] 2.12 SUM [9] 9.49 SUM [11] 2.78 SUM [13] 9.49 SUM [15] 4.47 [16] AREA ADJ FACTOR 1.000 1.000 1.000
[17] ADJ AVG POINT RAIN 2.12 2.78 4.47
DURATION 3-HOUR 6-HOUR 24-HOUR
EFFECTIVE RAIN (in) 1.31 1.30 1.28
FLOOD VOLUME (cu-ft) 45,222 44,840 44,164
(acre-ft) 1.04 1.03 1.01
REQUIRED STORAGE (cu-ft) 41,999 39,086 31,405
(acre-ft) 0.96 0.90 0.72
PEAK FLOW (cfs) 17.21 15.14 3.54
MAXIMUM WSEL (ft) 465.64 465.51 465.13

0.180
310.00

0.002
[12] S^0.5
[13] L*LCA/S^0.5
[14] AVERAGE MANNINGS 'N'
[10] H-FEET 4
[11] S-FEET/MILE

PHYSICAL DATA

RAINFALL DATA
[1] CONCENTRATION POINT 1
SUBAREA 5

9.490
950

0.059
471
467

0.05 2.8

2.8 5.7

22.2 4.72

0.27 STORM EVENT SUMMARY
[17] 100% OF LAG-MINUTES
[18] 200% OF LAG-MINUTES
[24] TOTAL PERCOLATION RATE (cfs)
[19] UNIT TIME-MINUTES (100%-200% OF LAG)
3-HOURS
Plate E-2.1

Page 2 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT CALHOUN AT AVENUE 49 - 100 YEAR EVENT CONCENTRATION POINT: 1BY MES R. BAZUA, P.E. DATE 1/17/2025

ADJUSTED LOSS RATE

SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AVERAGE

GROUP NUMBER AREA PERCENT INFILTRATION ADJUSTED

INFILTRATION OF AREA RATE INFILTRATION

0.00 0.000 0.0000

LAND USE

COMMERCIAL

PAVING/HARDSCAPE
SF - 1 ACRE
SF - 1/2 ACRESF - 1/4 ACRE
MF - COND0MINIUMS

MF - APARTMENTS

MOBILE HOME PARKS

LANDSCAPING

RETENTION BASINS

GOLF COURSE

MOUNTAINOUS
Plate E-2.1

Page 3 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 3 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: MES R. BAZUA, DATE 1/17/2025
DRAINAGE AREA-ACRES 9.49
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.83
UNIT TIME-PERCENT OF LAG 176.4
TOTAL ADJUSTED STORM RAIN-INCHES 2.12
CONSTANT LOSS RATE-in/hr 0.27
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.27 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 1.3 0.331 0.27 0.30 0.06 0.55 82.80
2 10 0.17 1.3 0.331 0.27 0.30 0.06 0.55 82.80
3 15 0.25 1.1 0.280 0.27 0.25 0.01 0.07 0.00
4 20 0.33 1.5 0.382 0.27 0.34 0.11 1.03 227.65
5 25 0.42 1.5 0.382 0.27 0.34 0.11 1.03 227.65
6 30 0.50 1.8 0.458 0.27 0.41 0.19 1.76 444.94
7 35 0.58 1.5 0.382 0.27 0.34 0.11 1.03 227.65
8 40 0.67 1.8 0.458 0.27 0.41 0.19 1.76 444.94
9 45 0.75 1.8 0.458 0.27 0.41 0.19 1.76 444.94
10 50 0.83 1.5 0.382 0.27 0.34 0.11 1.03 227.65
11 55 0.92 1.6 0.407 0.27 0.37 0.13 1.27 300.08
12 60 1.00 1.8 0.458 0.27 0.41 0.19 1.76 444.94
13 65 1.08 2.2 0.560 0.27 0.50 0.29 2.72 734.65
14 70 1.17 2.2 0.560 0.27 0.50 0.29 2.72 734.65
15 75 1.25 2.2 0.560 0.27 0.50 0.29 2.72 734.65
16 80 1.33 2.0 0.509 0.27 0.46 0.24 2.24 589.79
17 85 1.42 2.6 0.661 0.27 0.60 0.39 3.69 1024.36
18 90 1.50 2.7 0.687 0.27 0.62 0.41 3.93 1096.79
19 95 1.58 2.4 0.611 0.27 0.55 0.34 3.20 879.50
20 100 1.67 2.7 0.687 0.27 0.62 0.41 3.93 1096.79
21 105 1.75 3.3 0.840 0.27 0.76 0.57 5.38 1531.35
22 110 1.83 3.1 0.789 0.27 0.71 0.52 4.89 1386.50
23 115 1.92 2.9 0.738 0.27 0.66 0.46 4.41 1241.64
24 120 2.00 3.0 0.763 0.27 0.69 0.49 4.65 1314.07
25 125 2.08 3.1 0.789 0.27 0.71 0.52 4.89 1386.50
26 130 2.17 4.2 1.068 0.27 0.96 0.80 7.55 2183.20
27 135 2.25 5.0 1.272 0.27 1.14 1.00 9.48 2762.62
28 140 2.33 3.5 0.890 0.27 0.80 0.62 5.86 1676.21
29 145 2.42 6.8 1.730 0.27 1.56 1.46 13.83 4066.32
30 150 2.50 7.3 1.857 0.27 1.67 1.58 15.03 4428.46
31 155 2.58 8.2 2.086 0.27 1.88 1.81 17.21 5080.31
32 160 2.67 5.9 1.501 0.27 1.35 1.23 11.65 3414.47
33 165 2.75 2.0 0.509 0.27 0.46 0.24 2.24 589.79
34 170 2.83 1.8 0.458 0.27 0.41 0.19 1.76 444.94
35 175 2.92 1.8 0.458 0.27 0.41 0.19 1.76 444.94
36 180 3.00 0.6 0.153 0.27 0.14 0.02 0.14 0.00

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in) 1.31
FLOOD VOLUME (acft) 1.04
FLOOD VOLUME (cuft) 45221.59
REQUIRED STORAGE (acft) 0.96
REQUIRED STORAGE (cuft) 41998.54
PEAK FLOW RATE (cfs) 17.21
Loss Rate
in/hr
Time

EFFECTIVE RAIN CALCULATION FORM
Plate E-2.2

Page 4 of 14 ends

Item 33.

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: CALHOUN AT AVENUE 49 - 100 YEAR EVENT 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 1/17/2025
DRAINAGE AREA-ACRES 9.49
UNIT TIME-MINUTES 5
LAG TIME - MINUTES 2.83
UNIT TIME-PERCENT OF LAG 176.4
TOTAL ADJUSTED STORM RAIN-INCHES 2.78
CONSTANT LOSS RATE-in/hr 0.273
LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.27 cfs Unit Time Pattern Storm Effective Flood Required
Period Minutes Hours Percent Rain Rain Hydrograph Storage in/hr Flow
(Plate E-5.9) Max Low in/hr cfs cf
1 5 0.08 0.5 0.167 0.27 0.15 0.02 0.16 0.00
2 10 0.17 0.6 0.200 0.27 0.18 0.02 0.19 0.00
3 15 0.25 0.6 0.200 0.27 0.18 0.02 0.19 0.00
4 20 0.33 0.6 0.200 0.27 0.18 0.02 0.19 0.00
5 25 0.42 0.6 0.200 0.27 0.18 0.02 0.19 0.00
6 30 0.50 0.7 0.234 0.27 0.21 0.02 0.22 0.00
7 35 0.58 0.7 0.234 0.27 0.21 0.02 0.22 0.00
8 40 0.67 0.7 0.234 0.27 0.21 0.02 0.22 0.00
9 45 0.75 0.7 0.234 0.27 0.21 0.02 0.22 0.00
10 50 0.83 0.7 0.234 0.27 0.21 0.02 0.22 0.00
11 55 0.92 0.7 0.234 0.27 0.21 0.02 0.22 0.00
12 60 1.00 0.8 0.267 0.27 0.24 0.03 0.25 0.00
13 65 1.08 0.8 0.267 0.27 0.24 0.03 0.25 0.00
14 70 1.17 0.8 0.267 0.27 0.24 0.03 0.25 0.00
15 75 1.25 0.8 0.267 0.27 0.24 0.03 0.25 0.00
16 80 1.33 0.8 0.267 0.27 0.24 0.03 0.25 0.00
17 85 1.42 0.8 0.267 0.27 0.24 0.03 0.25 0.00
18 90 1.50 0.8 0.267 0.27 0.24 0.03 0.25 0.00
19 95 1.58 0.8 0.267 0.27 0.24 0.03 0.25 0.00
20 100 1.67 0.8 0.267 0.27 0.24 0.03 0.25 0.00
21 105 1.75 0.8 0.267 0.27 0.24 0.03 0.25 0.00
22 110 1.83 0.8 0.267 0.27 0.24 0.03 0.25 0.00
23 115 1.92 0.8 0.267 0.27 0.24 0.03 0.25 0.00
24 120 2.00 0.9 0.300 0.27 0.27 0.03 0.26 0.00
25 125 2.08 0.8 0.267 0.27 0.24 0.03 0.25 0.00
26 130 2.17 0.9 0.300 0.27 0.27 0.03 0.26 0.00
27 135 2.25 0.9 0.300 0.27 0.27 0.03 0.26 0.00
28 140 2.33 0.9 0.300 0.27 0.27 0.03 0.26 0.00
29 145 2.42 0.9 0.300 0.27 0.27 0.03 0.26 0.00
30 150 2.50 0.9 0.300 0.27 0.27 0.03 0.26 0.00
31 155 2.58 0.9 0.300 0.27 0.27 0.03 0.26 0.00
32 160 2.67 0.9 0.300 0.27 0.27 0.03 0.26 0.00
33 165 2.75 1.0 0.334 0.27 0.30 0.06 0.58 91.00
34 170 2.83 1.0 0.334 0.27 0.30 0.06 0.58 91.00
35 175 2.92 1.0 0.334 0.27 0.30 0.06 0.58 91.00
36 180 3.00 1.0 0.334 0.27 0.30 0.06 0.58 91.00
37 185 3.08 1.0 0.334 0.27 0.30 0.06 0.58 91.00
38 190 3.17 1.1 0.367 0.27 0.33 0.09 0.89 185.97
39 195 3.25 1.1 0.367 0.27 0.33 0.09 0.89 185.97
40 200 3.33 1.1 0.367 0.27 0.33 0.09 0.89 185.97
41 205 3.42 1.2 0.400 0.27 0.36 0.13 1.21 280.95
42 210 3.50 1.3 0.434 0.27 0.39 0.16 1.53 375.93
43 215 3.58 1.4 0.467 0.27 0.42 0.19 1.84 470.90
44 220 3.67 1.4 0.467 0.27 0.42 0.19 1.84 470.90
45 225 3.75 1.5 0.500 0.27 0.45 0.23 2.16 565.88
46 230 3.83 1.5 0.500 0.27 0.45 0.23 2.16 565.88
47 235 3.92 1.6 0.534 0.27 0.48 0.26 2.48 660.85
48 240 4.00 1.6 0.534 0.27 0.48 0.26 2.48 660.85
49 245 4.08 1.7 0.567 0.27 0.51 0.29 2.79 755.83
50 250 4.17 1.8 0.600 0.27 0.54 0.33 3.11 850.81
51 255 4.25 1.9 0.634 0.27 0.57 0.36 3.43 945.78
52 260 4.33 2.0 0.667 0.27 0.60 0.39 3.74 1040.76
53 265 4.42 2.1 0.701 0.27 0.63 0.43 4.06 1135.73
54 270 4.50 2.1 0.701 0.27 0.63 0.43 4.06 1135.73
55 275 4.58 2.2 0.734 0.27 0.66 0.46 4.38 1230.71
56 280 4.67 2.3 0.767 0.27 0.69 0.49 4.69 1325.69

EFFECTIVE RAIN CALCULATION FORM
Time Loss Rate
in/hr
Plate E-2.2

Page 5 of 14 ends

Coachella City CouncilJanuary 28, 2026

Coachella City Council
January 28, 2026