A 45-min rainstorm occurs on a 9-acre urban area having a runoff coefficient of 0.7. The time of concentration has been calculated as 20 min. Incremental rainfall depths for the storm are given in the table below. Using a spreadsheet, calculate the runoff from the storm at 5-minute intervals. Plot the resulting hydrograph.
Time (min) | Incremental Rainfall Depth (in.) |
0 | 0 |
5 | 0.1 |
10 | 0.18 |
15 | 0.29 |
20 | 0.6 |
25 | 0.64 |
30 | 0.51 |
35 | 0.3 |
40 | 0.17 |
45 | 0.07 |
50 | 0 |
55 | 0 |
60 | 0 |
65 | 0 |
70 | 0 |
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