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The net precipitation (runoff) in a three-hour period was 0.6 inches. The direct runoff hydrograph that...

The net precipitation (runoff) in a three-hour period was 0.6 inches. The direct runoff hydrograph that resulted from this precipitation was in the form of a triangle with a time base of 21 hours and with a peak flow of 200 cfs that occurred 9 hours from the beginning of the runoff.

(a) Sketch the direct runoff hydrograph. Be sure to label axes.

(b) Determine the runoff volume (ft3)

(c) Determine the drainage area (acres)

(d) Sketch the unit hydrograph – and show supporting calculations.

(e) What will the peak discharge in the stream be if a three-hour storm produces 2.4 inches of runoff? Assume baseflow is 50 cfs.

Engineering   Civil-Engineering   
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