Rain fell over a 1490-acre watershed at a constant rate of 2.75 inches/hour from 9 to 11 AM. Stream flow data recorded each hour are reported below. Note that the stream flow declines in dry periods to a relatively constant lower limit of 100 cfs (ft3/s). (a) Separate the base flow from the hydrograph. (b) When did direct (i.e., storm) runoff begin and end? (c) Find Pe,, the depth of excess precipitation, in inches. (d) Derive the 2-hour unit hydrograph.
DATA
clock time 9 10 11 12 1 2 3 4 5 6
total Q (cfs) 100 300 500 700 800 600 400 300 200 100
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