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1. The total observed runoff volume during a 4 hour storm with a uniform intensity of 2.8 cm/hr is 25.2 x 106 m3 from a basin of 280 km2 area. What is the average infiltration rate for the basin ?
(A): 3.6 mm/hr
(B): 4.8 mm/hr
(C): 5.2 mm/hr
(D): 5.5 mm/hr
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