Problem

A storm event occurred on Falls Creek Watershed that produced a rainfall pattern of 5 cm/h...

A storm event occurred on Falls Creek Watershed that produced a rainfall pattern of 5 cm/hr for the first 10 min, 10 cm/hr in the second 10 min, and 5 cm/hr in the next 10 min. The watershed is divided into three subbasins (see Figure), with the unit hydrographs given in the following table. Subbasins A and B had a loss rate of 2.5 cm/hr for the first 10 min and 1.0 cm/hr thereafter. Subbasin C had a loss rate of 1.0 cm/hr for the first 10 min and 0 cm/hr thereafter. Using a simple lag routing method (time shift the hydrograph by K), determine the storm hydrograph at point 2. Assume a lag time K of 30 min.

Figure

10-Minute Unit Hydrographs

Subbasin A		Subbasin B		Subbcsin C
Time (min)	Q (m3/s)	Time (min)	Q (m3/s)	Time (min)	Q (m3/s)
0	0	0	0	0	0
10	5	10	5	10	16 7
20	10	20	10	20	33.4
30	15	30	15	30	50 0
40	20	40	20	40	33.4
50	25	50	25	50	16 7
60	20	60	20	60	0
70	15	70	15
80	10	80	10
90	5	90	5
100	0	100	0

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