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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

    Source

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