SW6240905_Design Calculations_20241016 (9)

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
2084-Boone Trail 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 8.62 6.87 5.80 4.30 Grassed 0.15
50-yr 9.23 7.36 6.20 4.67
100-yr 9.80 7.79 6.57 5.03
Tc
Drainage Impervious Grassed Storm Rainfall
Ditch No. C Kerby Kirpich Intensity Q(cfs)
Area(ac) Area(ac) Area(ac) Event(yr)
Total Tc T,Used (in/hr)
L(ft) n s Toy, L(ft) S Tch
1 6.57 2.05 4.52 0.40 n/a 910.0 0.018 6.94 6.94 5 10-yr 7.72 20.29
2 7.32 2.29 5.03 0.40 n/a 1010.0 0.019 7.38 7.38 5 10-yr 7.72 22.60
3 1.34 0.59 0.75 0.50 n/a 1200.0 0.017 8.78 8.78 10 10-yr 6.17 4.13
4 1.41 0.62 0.79 0.50 n/a 1300.0 0.018 9.14 9.14 10 10-yr 6.17 4.35
5 0.44 0.14 0.30 0.40 n/a 490.0 0.030 3.57 3.57 5 10-yr 7.72 1.36
6 1.37 0.43 0.94 0.40 n/a 560.0 0.032 3.84 3.84 5 10-yr 7.72 4.23
7 4.45 1.39 3.06 0.40 n/a 940.0 0.022 6.62 6.62 5 10-yr 7.72 13.74
8 0.42 0.13 0.29 0.40 n/a 310.0 0.026 2.64 2.64 5 10-yr 7.72 1.30
9 0.12 0.06 0.05 0.60 n/a 150.0 0.018 1.74 1.74 5 10-yr 7.72 0.53
10 17.53 5.48 12.05 0.40 n/a 1650.0 0.016 11.41 11.41 10 10-yr 6.17 43.26
11 0.16 0.04 0.12 0.35 n/a 230.0 0.037 1.82 1.82 5 10-yr 7.72 0.43
12 0.65 0.20 0.45 0.40 n/a 450.0 0.030 3.31 3.31 5 10-yr 7.72 2.01
13 0.21 0.12 0.09 0.60 n/a 290.0 0.027 2.47 2.47 5 10-yr 7.72 0.97
14 1.03 0.32 0.71 0.40 n/a 590.0 0.031 4.07 4.07 5 10-yr 7.72 3.18
15 0.32 0.18 0.14 0.60 n/a 470.0 0.030 3.42 3.42 5 10-yr 7.72 1.50
16 1.42 0.71 0.71 0.55 n/a 715.0 0.028 4.87 4.87 5 10-yr 7.72 6.03
17 0.41 0.23 0.18 0.60 n/a 610.0 0.027 4.39 4.39 5 10-yr 7.72 1.90
18 0.26 0.15 0.11 0.60 n/a 260.0 0.005 4.34 4.34 5 10-yr 7.72 1.20
19 0.18 0.10 0.08 0.60 n/a 220.0 0.005 3.82 3.82 5 10-yr 7.72 0.82
20 4.98 1.56 3.42 0.40 n/a 850.0 0.028 5.58 5.58 5 10-yr 7.72 15.38
21 5.63 1.76 3.87 0.40 n/a 960.0 0.026 6.29 6.29 5 10-yr 7.72 17.39
22 6.03 1.88 4.15 0.40 n/a 1050.0 0.025 6.87 6.87 5 10-yr 7.72 18.62
23 1.94 0.61 1.33 0.40 n/a 580.0 0.031 3.99 3.99 5 10-yr 7.72 5.99
printed:10/16/2024 8:33 AM Page 1 of 2

4D Site Solutiorks, Inc.
Rainfll
Ditch No. Drainage Impervious Grassed C Kerby Tc Kirpich Storm Intensity Q(cfs)
Area(ac) Area(ac) Area(ac) L(ft) n s Toy L(ft) S T n Total Tc Tc Used Event(yr) (in/hr)
24 0.07 0.04 0.03 0.60 n/a 120.0 0.042 1.06 1.06 5 10-yr 7.72 0.33
25 2.40 0.75 1.65 0.40 n/a 670.0 0.030 4.52 4.52 5 10-yr 7.72 7.41
26 0.14 0.08 0.06 0.60 n/a 210.0 0.033 1.77 1.77 5 10-yr 7.72 0.63
27 3.69 1.15 2.54 0.40 n/a 820.0 0.032 5.16 5.16 5 10-yr 7.72 11.39
28 0.28 0.16 0.12 0.60 n/a 420.0 0.031 3.11 3.11 5 10-yr 7.72 1.29
29 5.23 1.63 3.60 0.40 n/a 1035.0 0.029 6.35 6.35 5 10-yr 7.72 16.15
30 0.39 0.22 0.17 0.60 n/a 600.0 0.035 3.91 3.91 5 10-yr 7.72 1.81
31 2.51 0.78 1.73 0.40 n/a 860.0 0.030 5.45 5.45 5 10-yr 7.72 7.75
32 0.26 0.15 0.11 0.60 n/a 400.0 0.039 2.75 2.75 5 10-yr 7.72 1.21
33 9.90 3.09 6.81 0.40 n/a 860.0 0.038 5.00 5.00 5 10-yr 7.72 30.57
34 0.72 0.23 0.50 0.40 n/a 600.0 0.020 4.85 4.85 5 10-yr 7.72 2.22
35 1.20 0.38 0.83 0.40 n/a 630.0 0.019 5.13 5.13 5 10-yr 7.72 3.71
36 2.08 0.65 1.43 0.40 n/a 960.0 0.020 6.95 6.95 5 10-yr 7.72 6.42
printed:10/16/2024 8:33 AM Page 2 of 2