Question: The stream flow given in the following table was produced by a 1-cm rainfall event (total depth). The effective portion of the rainfall lasted 1

The stream flow given in the following table was produced by a 1-cm rainfall event (total depth). The effective portion of the rainfall lasted 1 hr (from time 9 to time 10). If the watershed is 20 square kilometers, derive a 1-hr unit hydrograph for the watershed. Assume the groundwater contribution is linear from 1.4 m3/sec (at time 9) to 3.0 m3/sec (at time 17).

Time (hrs 8 Q(m sec) 1.6 1.4 4.6 9.7 13.0 10.5 7.8 5.8 4.5 3.0 2.9 2.8 10 13 14 15 16 17 8 19

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