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 Current Category » Micro Irrigation and Drainage Engineering Drainage Co-efficient The depth in centimeters of water drained off from a given area in 24 hours is called the drainage co-efficient. D.C = Total water discharge in 24 hrs (m3)           ______________________________             Total land area in sq. meters Ditch capacity (Discharge rate) = Total quantity of water discharged in 24 hrs (cum)                                                         ________________________________________                                                                       60 X 60 X 24 Example: A drainage canal discharge 0.2 cubic meters of water / sec and drains 250 hectares what will be drainage coefficient of this land? Total water discharge in 24 hrs = 0.2 x 60 X 60 X 24                                                    = 17280 m3 :. DC = 17280 / 250 X 104 = 0.0069m                       = 0.69 cm =7 mm Current Category » Micro Irrigation and Drainage Engineering