Soil and Water Conservation Engineering · Hydrology · 2 marks · Numerical answer
A 10 ha watershed receives 15 mm rainfall with 5 mm evapotranspiration,4.5 mm infiltration,2.2 mm deep percolation,.5 mm detention storage and .3 mm other abstractions. Neglect other surface storage. Find overland flow volume in integer m³.
The surface balance subtracts evapotranspiration, infiltration, detention and other surface abstractions: $R=15-5-4.5-.5-.3=4.7$ mm. Deep percolation is a subsequent destination of infiltrated water and is not subtracted a second time. Watershed area is $10(10000)=100000$ m². Thus $V=.0047(100000)=\mathbf{470}$ m³.
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