Rework Problem 1 if the storm occurred over a basin of 2.5 km2; the rainfall intensities were 12, 10, 3, 8, and 5 cm/hr; and the direct surface runoff was 463,000 m3.
Problem 1
Gross rain intensities during each hour of a 5-hr storm over a 1000-acre basin were 5, 4, 1, 3, and 2 in./hr, respectively. The direct surface runoff from the basin was 375 acre-ft. Determine the basin ϕ index.
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