SW6240201_Design Calculations (Pipe Flow)_20240213

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
2005-Langdon Preserve Subdivision
Rainfall Intensity
Storm Event 5-en 15-min
10-yr 7.61 6.09 5.14 3.72
25-yr 8.52 6.79 5.73 4.25
50-yr 9.16 7.30 6.16 4.64
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 Tell
1 0.65 0.45 n/a 330.0 0.005 5.28 5.28 5 25-yr 8.52 2.49
2 1.52 0.55 n/a 300.0 0.008 4.11 4.11 5 25-yr 8.52 7.14
3 2.00 0.45 n/a 420.0 0.028 3.22 3.22 5 25-yr 8.52 7.68
EXIST 18IN 4.63 0.45 n/a 650.0 0.003 10.60 10.60 10 25-yr 6.79 14.14
printed: 2/13/2024 7:29 AM Page 1 of 1