SW6231112_Design Calculations (Pipe Flow)_20240117

4D Site Solutions, Inc.
PIPE CALCULATIONS
NOTE:sheet only set up to handle Tc from 5 min to 30 min
A. Cross-pipes to use 25-yr storm inensity
1997-Brayden Preserve Subdivision
Rainfall Intensity
Storm Event 5- lin 15-min
10-yr 7.69 6.16 5.20 3.76
25-yr 8.59 6.85 5.79 4.29
50-yr 9.19 7.33 6.18 4.66
100-yr 9.76 7.76 6.54 5.01
Tc
Drainage Storm Rainfall
Pipe No. C Kerby Kirpich Intensity Q(cfs)
Area(ac) Event(yr)
Total Tc Tc Used (in/hr)
L(ft) n s Toy L(ft) S Tch
1 5.64 0.45 n/a 970.0 0.031 5.93 5.93 5 25-yr 8.59 21.80
2 2.36 0.45 n/a 565.0 0.037 3.66 3.66 5 25-yr 8.59 9.11
3 5.15 0.45 n/a 875.0 0.036 5.18 5.18 5 25-yr 8.59 19.90
4 6.99 0.45 n/a 1130.0 0.027 7.07 7.07 5 25-yr 8.59 27.01
5 0.63 0.45 n/a 650.0 0.048 3.67 3.67 5 25-yr 8.59 2.42
6 5.74 0.40 n/a 935.0 0.049 4.84 4.84 5 25-yr 8.59 19.73
7 11.50 0.40 n/a 1225.0 0.036 6.67 6.67 5 25-yr 8.59 39.50
8 2.32 0.40 n/a 830.0 0.045 4.55 4.55 5 25-yr 8.59 7.98
9 3.54 0.40 n/a 700.0 0.047 3.92 3.92 5 25-yr 8.59 12.17
10 0.23 0.55 n/a 100.0 0.010 1.59 1.59 5 25-yr 8.59 1.08
printed: 1/17/2024 5:22 PM Page 1 of 1