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Question

During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area 8.6 km2. The measured runoff volume during this period was 2,56,000 m3. The total rainfall last due to infiltration, evaporation and transpiration in cm/hr is

A
0.80
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B
0.304
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C
0.496
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D
Sufficient information not available
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Solution

The correct option is B 0.304
Rainfall depth=0.8×6
=4.8 cm
Rainfall volume=4.8100×8.6×106
=412800 m3

Total volume loss in infiltration, evaporation & transpiration
=412800256000
=156800 m3

Total rainfall loss in cm/hr
=156800×1008.6×106×6
=0.304 cm/hr

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