Question: A 2 0 . 7 k m 2 watershed has a time ofconcentration of 1 . 0 h r . Calculate the 1 0 -

A 20.7km2 watershed has a time ofconcentration of 1.0hr. Calculate the 10-min unit hydrograph for the watershed using the SCS triangular unit hydrograph method. Determine the direct runoff hydrograph for a 30-minute storm with 1.5cm of excess rainfall for the first 10min,0.5cm for the second 10min, and 1.0cm for the third 10min.
A 2 0 . 7 k m 2 watershed has a time

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