The ordinates of a 3hr unit hydrograph of a basin at 6 hr interval are given below. You are required to derive the storm hydrograph due to a 3 hr storm with a total rainfall of 15 cm. Assume an initial loss of 0.5 cm and aφindex of 1 cm/ hr. Take base flow = 2.5 m3/s
Time (hrs)
0 6 12 18 25 30 36 42 48 54 60
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Unit Hydrograph
m3/s 0 3 5 9 11 7 5 4 2 1 0
Please explain in words and show the calculations you did to arrive at the solution.