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Let us take the gross commanded area of a watercourse is 2000 hectares, 80% of which is culturable irrigable. Intensities of sugarcane and paddy are 30% and 50%. The duties of the crops at the head of the watercourse are 850 hectares/cumec and 1900 hectares/cumec. Find the discharge required at the head of the watercourse?

Let us take the gross commanded area of a watercourse is 2000 hectares, 80% of which is culturable irrigable. Intensities of sugarcane and paddy are 30% and 50%. The duties of the crops at the head of the watercourse are 850 hectares/cumec and 1900 hectares/cumec. Find the discharge required at the head of the watercourse? Correct Answer 0.986 cumec

Given G.C.A = 2000 hectares Now the C.C.A = 2000 x 80 / 100 = 1600 hectares Intensity of irrigation for sugarcane = 30% Area to be irrigated under sugarcane = 1600 x 30/100 = 480 hectares Intensity of irrigation of paddy = 50% Area to be irrigated under paddy = 1600 x 50/100 = 800 hectares Duty of sugarcane = 850 hectares/cumec Duty of paddy = 1900 hectares/cumec Discharge for sugarcane = 480 / 850 = 0.565 cumec Discharge for paddy = 800 / 1900 = 0.421 cumec Now the total canal capacity at the head of watercourse is = 0.565 + 0.421 = 0.986 cumec.

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