The command area of a channel is 6000ha. 80% of which is culturable imigable. The intensity of irrigation for rabi season is 50% and that for kharif season is 25% If the average duty at the head of the distributary is 2000 Halcumec for rabi season and 900 Halcumec for kharif season, find the design discharge required at the head of the distributary from the average demand considerations. Assume transmission loss 10%.
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Explanation:
Gross command area = 6000 hectare Culturable command area = 80% of GCA = 0.8 × 6000 = 4800 hectare Intensity of irrigation for Rabi season = 50% The intensity of irrigation for Kharif season = 25% Duty for the rabi season = 2000 hectare/cumec Duty for Kharif season = 1000 hectare/cumec S0, area under rabi season = 0.5 × 4800 = 2400 hectare Area under kharif season = 0.25 × 4800 = 1200 hectare Discharge required for rabi season = area under rabi season/duty for rabi season = 2400/2000 = 1.2 cumec Discharge required for kharif season = 1200/1000 = 1.2 cumec The maximum value of discharge will be taken for two different seasons. here in both season discharge are equal Dischare required = 1.2 cumec
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