Irrigation Engineering
The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by

period of storm
direct runoff volume
total rainfall
None of these

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to infiltration
Available water stored in soil within root zone of the crop
Total precipitation during the crop period
Total precipitation minus the loss due to evaporation

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