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Question

# Calculate the runoff (cm) from a rainfall of 3 hours. The intensity of the rainfall is 2 cm/hr. The evaporation and infiltration losses are 8 mm and 16 mm.

A
1.2
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B
2.8
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C
3.6
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D
6.8
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Solution

## The correct option is C 3.6Given that: Intensity of rainfall = 2 cm/hr. Duration = 3 hours Evaporation = 8 mm = 0.8 cm. Infiltraton loss = 1.6 cm. Water budget equation ; P−R−E−T−G=ΔS where, P=Precipitation. R= Net runoff. E= Net evaporation. T=Net transpiration. G=Net groundwater flow. ΔS=Net storage. Precipitation (P)=2×3=6 cm Hence, 6−R−0.8−0−1.6=0 Runoff (R)=(6−2.4) cm =3.6 cm

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