Question: Storm data (Fig. P2.9) were recorded for a storm over a 205-acre basin on September 1, 1999. Approximations for the rainfall and runoff cumulative

Storm data (Fig. P2.9) were recorded for a storm o

Storm data (Fig. P2.9) were recorded for a storm over a 205-acre basin on September 1, 1999. Approximations for the rainfall and runoff cumulative mass curves are shown by the black dots in the figure. a) Determine the duration and average intensity of the rainfall. b) What is the time to peak for this storm? c) Find the index for this storm using the rainfall and hydrograph data. d) Develop a UH for this watershed using the duration of part (a). Discharge Accumulated runoff -- Accumulated rainfall 150 5.0 4.5 125 4.0 3.5 100 3.0 2.5 75 2.0 1.5 50 1.0 25 0.5 0.0 16 17 18 19 20 21 24 23 Time (hr) Rainfall and runoff (in.) 22 Discharge (cfs)

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