If the gross rainfall of Problem falls over a watershed with area of 1600 acres, find the volume that was left to infiltration (assume evaporation can be neglected) based on the volume under the hydrograph.
Problem
For the rainfall record provided below, plot cumulative rainfall (P) and gross rainfall hyetograph (in./hr) using Δt = 15 min = 0.25 hr.
Time (min) | 0 | 15 | 30 | 45 | 60 | 75 | 90 | 1 05 | 1 20 | 135 |
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P (in.) | 0 | 0.2 | 0.6 | 1.1 | 1.5 | 1.8 | 2.0 | 2.2 | 2.3 | 2.5 |
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Time (hr) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 |
Q (cfs) | 1 00 | 200 | 500 | 800 | 700 | 550 | 450 | 250 | 1 50 | 100 | 75 | 0 |
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