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A hydrograph for was obtained for this representative catchment and is given below. 1.Calculate the precipitation excess that would be needed to obtain this hydrograph from the unit hydrograph method. The resulting precipitation excess corresponds to a 30-min time duration. Show the unit hydrograph in table format. (2) 2.Determine the runoff hydrograph for a 30min rainfall excess of 2cm. (2) 3.Estimate the runoff hydrograph for a 50min rainfall excess of 3cm. (4) Time (hr) Runoff (m/s) 10 18 25 21 15 4
The area is 20 km^2
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Answer #1

3 Rainpell excess-depth: l. T 46 cm 349.00 - Avea = 2.0 kmbuno ordinste ordinateseumn2 2cm Rainfall 11.444 20.6 28.62 2-4.04 l1.2 6.86 0 5.12 o 3 2.5 12.0 2 1 5 6 3 4 3 1-14uno Rampll-excess 3cm we first evalmte ordinata , r_50m- amit it от 30 min lAY), S-Cusve techi Tenmlblyin the ordinter of 50m

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