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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