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Numerical on Hydrology

**A 3 hour storm produced a flood hydrograph and the observations were at 3 hour intervals starting from zero hour. The observed discharge in cumecs are 4, 9, 12, 18, 20, 16, 20, 10, 8, 6, 4. Assume constant base flow 4 cumecs. Determine unit hydrograph ordinates. The catchment area is 50 sq km.**

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