The following table gives the measured rainfall and surface runoff from a 65-acr
ID: 1823430 • Letter: T
Question
The following table gives the measured rainfall and surface runoff from a 65-acre watershed. Values given are averages over the time interval. Compute the accumulated storage (ft^3) of water within the watershed. Plot on the same graph the inflow, outflow, and comulative storage as a funtion of time.
Time
(min)
Rainfall
(inches)
Runoff
(ft^3/sec)
0
10
20
30
40
50
60
0
.07
.15
.21
.16
.09
.05
0
2.1
9.5
18.9
37.3
48.8
52.2
Time
(min)
Rainfall
(inches)
Runoff
(ft^3/sec)
0
10
20
30
40
50
60
0
.07
.15
.21
.16
.09
.05
0
2.1
9.5
18.9
37.3
48.8
52.2
Explanation / Answer
Area of watershed = (65 Acre)(43560 ft2/Acre) = 2831400 ft2 converting all the inches values to feet 0.006 ft x 2,831,400 =16,988.4 ft3 0.013 ft x 2,831,400 =36,808.2 ft3 0.017 ft x 2,831,400 =48,133.8 ft3 0.013 ft x 2,831,400 =36,808.2 ft3 0.008 ft x 2,831,400 =22,651.2 0.004 ft x 2,831,400 =11,325.6 Accumulation=Rainfall Volume-Runoff accumulation: 0 15,728 31,108 36,793 14,428 -6,629 -20,2344 total=71,193.6 ft3
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