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Determine the discharge required at the head of the distributary in a canal where Kharif area to be irrigated is 2400 hectares and Rabi area to be irrigated is 1800 hectares, for fulfilling maximum crop requirement. Assume suitable values for kor depth and kor period.

Determine the discharge required at the head of the distributary in a canal where Kharif area to be irrigated is 2400 hectares and Rabi area to be irrigated is 1800 hectares, for fulfilling maximum crop requirement. Assume suitable values for kor depth and kor period. Correct Answer 2.08 cumec

Now let us assume kor period of 4 weeks for Rabi and 3 weeks for Kharif crop. Also, assume kor depth of 12.5 cm for Rabi and 21 cm for Kharif crop. Outlet factor for rabi = (864B/∆) = 864 x 4 x 7 / 12.5 = 1935.36 hectares/cumec Outlet factor for kharif = (864B/∆) = 864 x 3 x 7 / 21 = 864 hectares/cumec Area to be irrigated for Rabi season = 2400 hectares Area to be irrigated for Kharif season = 1800 hectares Water required for Kharif season at the distributary = 1800 / 864 = 2.08 cumec Water required for Rabi season at the distributary = 2400 / 1935.36 = 1.24 cumec Therefore, the canal capacity at the head of the distributary is the maximum of the two, 2.08 cumec.

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