Problem

A sketch of the Buffalo Creek Watershed is shown in Figure. Areas A and B are identical in...

A sketch of the Buffalo Creek Watershed is shown in Figure. Areas A and B are identical in size, shape, slope, and channel length. UHs (1 hr) are provided for natural and fully developed conditions for both areas.

Figure

Sketch of Buffalo Creek watershed.

Time (hr)	1	2	3	4	5	6	7	8
UHdev (cfs)	40	196	290	268	185	90	30	0
Time (hr)	1	2	3	4	5	6	7	8	9	10	11	12	13	14
UH (nat)	12	32	62	1 08	180	208	182	1 26	80	53	32	18	6	0

(a) Assuming natural conditions for both areas, evaluate the peak outflow at point 1 if 2.5 in./hr of rain falls for 2 hr. Assume a total infiltration loss of 1 in.
(b) Assume that area B has reached full development and area A has remained in natural conditions. Determine the outflow hydrograph at point 1 if a net rainfall of 2 in./hr falls for 1 hr.
(c) Sketch the outflow hydrograph for the Buffalo Creek Watershed under complete development (A and B both urbanized) for the rainfall given in part (b).

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