The 15-min unit hydrograph for a 2.1 km2 urban catchment is given by the table provided on e Campus in the "2) Complete computer practice activities using Excel" folder and can also be found here a. Estimate the runoff hydrograph for a 30-min rainfall excess of 10.3 cm, Assume that the runoff hydrograph results from two consecutive15-min rainfall excesses of 5.15 cm. (The runoff hydrograph is calculated by adding the runoff hydrographs from two consecutive events, separated by 15 minutes.) b. Determine the S-hydrograph

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