2.9 Storm data (Fig. P2-9) were recorded for a storm over a 205-acre basin on Sep- 9 tember 1, 1999. Approximations for the rainfall and runoff cumulative mass curves are shown by the black dashes in...
2.9 Storm data (Fig. P2-9) were recorded for a storm over a 205-acre basin on Sep- 9 tember 1, 1999. Approximations for the rainfall and runoff cumulative mass curves are shown by the black dashes 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 φ 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 5.0 5 150 4.0 125 100 -2.0 E 1.5 1.0 0.5 0.0 50 A 9 2 16 17 18 19 20 Time (hr) 21 24 Figure P2-9
2.9 Storm data (Fig. P2-9) were recorded for a storm over a 205-acre basin on Sep- 9 tember 1, 1999. Approximations for the rainfall and runoff cumulative mass curves are shown by the black dashes 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 φ 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 5.0 5 150 4.0 125 100 -2.0 E 1.5 1.0 0.5 0.0 50 A 9 2 16 17 18 19 20 Time (hr) 21 24 Figure P2-9