Suppose the culturable commanded for a distributary is 8000 hectares, and the intensity of irrigation for Kharif season is 60% and that of rabi season is 30%. The average duty at the head of a distributary is 4000 hectares/cumec for Kharif season and for Rabi season it is 1800 hectares/cumec, find out discharge required at the head of the distributary?

Question

Suppose the culturable commanded for a distributary is 8000 hectares, and the intensity of irrigation for Kharif season is 60% and that of rabi season is 30%. The average duty at the head of a distributary is 4000 hectares/cumec for Kharif season and for Rabi season it is 1800 hectares/cumec, find out discharge required at the head of the distributary?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

Suppose the culturable commanded for a distributary is 8000 hectares, and the intensity of irrigation for Kharif season is 60% and that of rabi season is 30%. The average duty at the head of a distributary is 4000 hectares/cumec for Kharif season and for Rabi season it is 1800 hectares/cumec, find out discharge required at the head of the distributary?

(a) 1.35 cumec

(b) 1.32 cumec

(c) 1.33 cumec

(d) 1.3 cumec

I got this question in semester exam.

My question is based upon Design Capacity for an Irrigation Canal in section Sediment Transport and Irrigation Channels Design of Irrigation Engineering

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Greg · Answer 1 · 2023-07-31T20:07:11+0000

Right choice is (c) 1.33 cumec

To explain: Area to be irrigated in Kharif season = 8000 x 60/100 = 4800 hectares

Area to be irrigated in Rabi season = 8000 x 30/100 = 2400 hectares

Water required at the head of distributary to irrigate Kharif area = 4800 / 4000 = 1.2 cumec

Water required at the head of distributary to irrigate Rabi area = 2400 / 1800 = 1.33 cumec

Therefore, the required discharge is maximum of the two = 1.33 cumec.

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