Watershed A and watershed B are in the same region, are at the same elevation, a

Question

Watershed A and watershed B are in the same region, are at the same elevation, and were subject to the same frontal storm system. The total precipitation during this storm was estimated to be 52 mm. The total event flow caused by this storm was 7 mm for watershed A, and 12 mm for watershed B. What are the event runoff ratios for these storm responses in watersheds A and B? Which watershed partitioned a larger fraction of the precipitation into storage during the event, and briefly explain why you chose your answer? Which watershed would you expect to have the higher curve number for the SCS (or NRCS) curve number method, and briefly explain why you chose your answer?

Explanation / Answer

a. given precipitation=52mm.

flow A=7mm. flow B=12mm.

A = 7/52 = 0.13

B = 12/52 = 0.23

b. larger fraction of the precipitation into storage during the event is in watershed A because it experienced lesser flow than watershed B.

c. watershed B will have higher curve number since the flow is higher in watershed B.Hence it will have higher run off potential .

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