SW6240607_Design Calculations_20240830 (16)

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
2029-Rolling Springs Section 9
Rainfall Intensity
Storm Event 5 in 15-min
10-yr 7.79 6.23 5.25 3.80
25-yr 8.70 6.93 5.86 4.34
50-yr 9.29 7.41 6.25 4.71
100-yr 9.86 7.84 6.61 5.06
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 7.32 0.45 n/a 1230.0 0.058 5.59 5.59 5 25-yr 8.70 28.66
2 2.26 0.45 n/a 700.0 0.045 3.99 3.99 5 25-yr 8.70 8.85
3 4.24 0.45 n/a 820.0 0.043 4.60 4.60 5 25-yr 8.70 16.60
4 0.83 0.50 n/a 430.0 0.056 2.52 2.52 5 25-yr 8.70 3.61
5 0.31 0.45 n/a 185.0 0.029 1.69 1.69 5 25-yr 8.70 1.22
6(PRE) 27.09 0.21 n/a 1920.0 0.044 8.76 8.76 10 25-yr 6.93 39.42
6(POST) 26.98 0.45 n/a 1980.0 0.043 9.08 9.08 10 25-yr 6.93 84.14
7(PRE) 19.73 0.30 n/a 1170.0 0.041 6.15 6.15 5 25-yr 8.70 51.50
7(POST) 19.80 0.40 n/a 1170.0 0.041 6.15 6.15 5 25-yr 8.70 68.90
8(PRE) 5.85 0.35 n/a 670.0 0.052 3.65 3.65 5 25-yr 8.70 17.81
8(POST) 5.85 0.45 n/a 670.0 0.052 3.65 3.65 5 25-yr 8.70 22.90
printed: 8/30/2024 3:49 PM Page 1 of 1