TM 5-815-5/AFM 88-5, Chap 6/NAVFAC P-418
PROBLEM: Determine sump and pump capacity to control surface water in an excava-
tion, 4 acres in area, located in Little Rock, Ark., for a rainstorm frequency of 1 in
5 years and assuming c = 0.9. Assume all runoff to one sump in bottom of excava-
tion.
SOLUTION:
V R = cRA
FROM FIGURE:
3
Rainstorm, min
R, in.
V R - (x 10 g a l )
10
0.85
83
30
1.70
166
60
2.10
205
Assume sump pump capacity = 4000 gpm. From plot, required storage = 50,000 gal.
U. S. Army Corps of Engineers
Figure D-10. Sump and pump capacity for surface runoff to an excavation.
D-11
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