The runoff characteristics of the watershed above the stream gage of Problem 8.28 are repr...

The runoff characteristics of the watershed above the stream gage of Problem 8.28 are represented by a CN of 76 and the unit hydrograph developed in Problem 8.28. De­termine the hydrograph resulting from a storm with the cumulative rain depths tabu­lated below. The flow just before the rain storm was 650 cfs.

Problem 8.28

Observed flows at a stream gaging station resulting from a 3-hour rain storm are tab­ulated on the next page. The rain began at 3:00 p.m. (15:00 hours) on day 1 and con­tinued for 3 hours. The stream gaging station has a drainage area of 146 mi.2. Use this observed hydrograph to develop a unit hydrograph.