Irrigation Engineering
If B and d are the bed width and depth of a channel in meters, the combined losses due to evaporation and seepage in cumecs per kilometer length of the channel, is

(1/50) × (B + d)2/3
(1/200) × (B + d)2/3
(1/100) × (B + d)2/3
(1/150) × (B + d)2/3

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