SW6240105_Design Calculations_20240424 (4)

4D Site Solutions, Inc.
DITCH CALCULATIONS
NOTE:sheet only set up to handle Tc from 5 min to 30 min
A. Flow velocity<2.0 fps when discharging to wetlands B. Flow velocity<4.5 fps all other cases** C. Channel slope<5.0%for curb outlet swales
2000-Elyse Meadows Subdivision
Rainfall Intensity
Storm Event
5-min 10-min 15-min 30-min RunoffCoeff.
10-yr 7.72 6.17 5.20 3.77 Impervious 0.95
25-yr 8.63 6.87 5.81 4.30 Grassed 0.30
50-yr 9.25 7.37 6.22 4.69
100-yr 9.85 7.83 6.60 5.05
Tc
Drainage Impervious Grassed Storm Rainfall
Ditch No. C Kerby Kirpich Intensity Q(cfs)
Area(ac) Area(ac) Area(ac) Event(yr)
Total Tc Tc Used (in/hr)
L(ft) n s T0v L(ft) S To,
1 0.13 0.06 0.07 0.60 n/a 180.0 0.008 2.76 2.76 5 10-yr 7.72 0.60
2 0.61 0.14 0.47 0.45 n/a 290.0 0.042 2.09 2.09 5 10-yr 7.72 2.12
3 0.12 0.06 0.06 0.60 n/a 170.0 0.550 0.51 0.51 5 10-yr 7.72 0.56
4 0.49 0.11 0.37 0.45 n/a 350.0 0.014 3.64 3.64 5 10-yr 7.72 1.69
5 0.25 0.11 0.13 0.60 n/a 350.0 0.013 3.73 3.73 5 10-yr 7.72 1.14
6 0.82 0.19 0.63 0.45 n/a 530.0 0.017 4.74 4.74 5 10-yr 7.72 2.84
7 0.98 0.23 0.76 0.45 n/a 470.0 0.017 4.27 4.27 5 10-yr 7.72 3.41
8 0.35 0.16 0.19 0.60 n/a 500.0 0.025 3.86 3.86 5 10-yr 7.72 1.63
9 1.81 0.42 1.39 0.45 n/a 710.0 0.021 5.40 5.40 5 10-yr 7.72 6.28
10 0.34 0.08 0.26 0.45 n/a 375.0 0.019 3.41 3.41 5 10-yr 7.72 1.16
11 0.08 0.04 0.04 0.60 n/a 130.0 0.012 1.82 1.82 5 10-yr 7.72 0.36
12 3.28 0.76 2.53 0.45 n/a 990.0 0.014 8.19 8.19 10 10-yr 6.17 9.12
13 0.25 0.12 0.14 0.60 n/a 420.0 0.007 5.64 5.64 5 10-yr 7.72 1.17
14 3.45 0.80 2.65 0.45 n/a 1090.0 0.014 8.80 8.80 10 10-yr 6.17 9.58
15 0.15 0.07 0.08 0.60 n/a 220.0 0.010 2.92 2.92 5 10-yr 7.72 0.70
16 0.80 0.18 0.62 0.45 n/a 380.0 0.015 3.81 3.81 5 10-yr 7.72 2.78
17 0.56 0.26 0.30 0.60 n/a 890.0 0.011 8.36 8.36 10 10-yr 6.17 2.07
18 0.90 0.21 0.69 0.45 n/a 540.0 0.023 4.24 4.24 5 10-yr 7.72 3.13
19 0.79 0.36 0.43 0.60 n/a 1200.0 0.023 7.87 7.87 10 10-yr 6.17 2.93
20 1.01 0.23 0.78 0.45 n/a 600.0 0.039 3.76 3.76 5 10-yr 7.72 3.51
21 1.08 0.25 0.83 0.45 n/a 700.0 0.044 4.04 4.04 5 10-yr 7.72 3.74
22 0.80 0.37 0.43 0.60 n/a 1300.0 0.024 8.23 8.23 10 10-yr 6.17 2.96
23 0.28 0.13 0.15 0.60 n/a 360.0 0.031 2.75 2.75 5 10-yr 7.72 1.30
printed:4/24/2024 7:23 AM Page 1 of 3

4D Site Solutions, Inc.
Drainage Impervious Grassed T Storm Rainfall
Ditch No. C Kerby Kirpich Intensity Q(cfs)
Area(ac) Area(ac) Area(ac) Total Tc Tc Used Event(yr)
L(ft) n s To, L(ft) S To, (in/hr)
24 0.39 0.18 0.21 0.60 n/a 510.0 0.030 3.66 3.66 5 10-yr 7.72 1.79
25 0.63 0.29 0.34 0.60 n/a 700.0 0.027 4.87 4.87 5 10-yr 7.72 2.92
26 0.68 0.31 0.36 0.60 n/a 800.0 0.027 5.39 5.39 5 10-yr 7.72 3.14
27 3.63 0.84 2.80 0.45 n/a 1190.0 0.014 9.42 9.42 10 10-yr 6.17 10.09
28 0.83 0.26 0.58 0.50 n/a 560.0 0.030 3.92 3.92 5 10-yr 7.72 3.21
29 21.71 3.34 18.37 0.40 n/a 2960.0 0.030 14.17 14.17 15 10-yr 5.20 45.15
30 38.84 5.98 32.87 0.40 n/a 2960.0 0.030 14.17 14.17 15 10-yr 5.20 80.79
31 3.38 0.78 2.60 0.45 n/a 980.0 0.014 8.02 8.02 10 10-yr 6.17 9.39
32 0.21 0.10 0.11 0.60 n/a 310.0 0.005 4.97 4.97 5 10-yr 7.72 0.99
33 0.86 0.27 0.60 0.50 n/a 565.0 0.013 5.47 5.47 5 10-yr 7.72 3.33
34 0.12 0.06 0.07 0.60 n/a 180.0 0.006 3.07 3.07 5 10-yr 7.72 0.56
35 1.63 0.38 1.26 0.45 n/a 850.0 0.016 6.96 6.96 5 10-yr 7.72 5.67
36 0.23 0.11 0.12 0.60 n/a 335.0 0.012 3.81 3.81 5 10-yr 7.72 1.05
37 0.39 0.18 0.21 0.60 n/a 530.0 0.013 5.14 5.14 5 10-yr 7.72 1.81
38 2.07 0.64 1.43 0.50 n/a 970.0 0.021 6.93 6.93 5 10-yr 7.72 7.99
39 2.23 0.51 1.72 0.45 n/a 740.0 0.009 7.91 7.91 10 10-yr 6.17 6.20
40 1.76 0.41 1.35 0.45 n/a 520.0 0.023 4.09 4.09 5 10-yr 7.72 6.11
41 0.87 0.20 0.67 0.45 n/a 470.0 0.027 3.58 3.58 5 10-yr 7.72 3.04
42 0.11 0.05 0.06 0.60 n/a 150.0 0.023 1.58 1.58 5 10-yr 7.72 0.49
43 2.31 0.71 1.60 0.50 n/a 1030.0 0.041 5.57 5.57 5 10-yr 7.72 8.93
44 0.51 0.24 0.28 0.60 n/a 550.0 0.055 3.07 3.07 5 10-yr 7.72 2.38
45 4.94 1.14 3.80 0.45 n/a 1300.0 0.029 7.60 7.60 10 10-yr 6.17 13.72
46 4.83 1.11 3.72 0.45 n/a 1150.0 0.029 6.90 6.90 5 10-yr 7.72 16.78
47 1.67 0.51 1.16 0.50 n/a 1100.0 0.032 6.44 6.44 5 10-yr 7.72 6.45
48 4.58 1.06 3.52 0.45 n/a 1050.0 0.030 6.34 6.34 5 10-yr 7.72 15.90
49 1.50 0.46 1.04 0.50 n/a 870.0 0.035 5.18 5.18 5 10-yr 7.72 5.80
50 2.43 0.56 1.87 0.45 n/a 800.0 0.024 5.64 5.64 5 10-yr 7.72 8.44
51 0.15 0.07 0.08 0.60 n/a 225.0 0.048 1.63 1.63 5 10-yr 7.72 0.70
52 1.36 0.31 1.04 0.45 n/a 480.0 0.008 5.81 5.81 5 10-yr 7.72 4.71
53 1.20 0.28 0.92 0.45 n/a 525.0 0.010 5.82 5.82 5 10-yr 7.72 4.17
54 2.03 0.47 1.56 0.45 n/a 780.0 0.016 6.48 6.48 5 10-yr 7.72 7.06
55 3.43 0.79 2.64 0.45 n/a 1290.0 0.020 8.79 8.79 10 10-yr 6.17 9.53
56 0.28 0.13 0.15 0.60 n/a 425.0 0.026 3.36 3.36 5 10-yr 7.72 1.32
57 3.57 1.10 2.47 0.50 n/a 1460.0 0.022 9.23 9.23 10 10-yr 6.17 11.02
58 0.42 0.19 0.23 0.60 n/a 590.0 0.031 4.07 4.07 5 10-yr 7.72 1.95
59 4.15 1.28 2.88 0.50 n/a 1590.0 0.025 9.49 9.49 10 10-yr 6.17 12.81
60 0.20 0.09 0.11 0.60 n/a 305.0 0.020 2.88 2.88 5 10-yr 7.72 0.93
printed.4/24/2024723 AM Page 2 of 3

4D Site Solutions, Inc.
Ditch No. ll
Drainage Impervious Grassed C Kerby Tc Kirpich Storm Intensity Q(cfs)
Area(ac) Area(ac) Area(ac) L(ft) n s Tnv L(ft) S Tin Total Tc Tc Used Event(yr) tensi)
61 1.78 0.41 1.37 0.45 n/a 430.0 0.039 2.90 2.90 5 10-yr 7.72 6.18
62 7.08 1.63 5.45 0.45 n/a 1110.0 0.017 8.26 8.26 10 10-yr 6.17 19.66
63 7.22 1.67 5.55 0.45 n/a 1240.0 0.020 8.47 8.47 10 10-yr 6.17 20.05
64 0.17 0.08 0.09 0.60 n/a 230.0 0.005 3.95 3.95 5 10-yr 7.72 0.80
65 4.71 1.09 3.62 0.45 n/a 930.0 0.017 7.16 7.16 5 10-yr 7.72 16.36
66 0.20 0.09 0.11 0.60 n/a 310.0 0.005 4.97 4.97 5 10-yr 7.72 0.92
67 1.13 0.26 0.87 0.45 n/a 530.0 0.025 4.06 4.06 5 10-yr 7.72 3.93
68 0.10 0.05 0.05 0.60 n/a 130.0 0.068 0.93 0.93 5 10-yr 7.72 0.46
69 0.29 0.13 0.15 0.60 n/a 420.0 0.011 4.66 4.66 5 10-yr 7.72 1.33
70 0.32 0.15 0.17 0.60 n/a 470.0 0.011 5.05 5.05 5 10-yr 7.72 1.48
71 0.93 0.28 0.64 0.50 n/a 670.0 0.023 5.03 5.03 5 10-yr 7.72 3.57
72 0.42 0.13 0.29 0.50 n/a 230.0 0.051 1.62 1.62 5 10-yr 7.72 1.63
73 0.90 0.21 0.69 0.45 n/a 350.0 0.037 2.53 2.53 5 10-yr 7.72 3.11
printed:4/24/20247:23 AM Page 3 of 3