Duty of irrigation water is defined as the area of land irrigated per unit of:
AVolume of rainfall (hectares per mm)
BTotal canal length (km per hectare)
CDischarge (hectares per cumec)
DCrop depth (meters per hectare)
Explanation
Duty of water is defined as the total area of land (in hectares) that can be fully irrigated by a continuous unit discharge of water (1 cumec = 1 m^3/s) flowing throughout the base period of a crop.
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