The incremental rainfall data in the table were recorded at a rainfall gage on a small urban parking lot of 1 acre. Be careful to use a 0.5-hr time step and record intensity in cm/hr.
(a) Plot the rainfall hyetograph.
(b) Determine the total storm rainfall depth (inches).
(c) If 100% of the rainfall occurs as runoff and the time base of a triangular hydrograph (flow rate vs. time) is 3 hr, find the peak flow of the hydrograph in cfs. Be careful with units.
Hint: First find the volume of rainfall, then equate it to the area under the hydrograph.
Time (hr) | Rainfall (cm) |
0 | 0 |
0.5 | 5.0 |
1.0 | 5.5 |
1.5 | 10.0 |
2.0 | 12.0 |
2.5 | 10.0 |
3.0 | 4.5 |
3.5 | 3.0 |
4.0 | 2.5 |
4.5 | 0 |
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