Let us consider in a given area the plantation of a certain crop takes 20 days, and the total water depth required by this crop is 80 cm on the field. Find the duty of irrigation water required for the crop during this period. (a) Assuming 20% losses of water in the water courses, find duty at the head of the course. (b) Find the duty of the water at the head of the distributary, assuming 10% losses from the distributary head.

Question

Let us consider in a given area the plantation of a certain crop takes 20 days, and the total water depth required by this crop is 80 cm on the field. Find the duty of irrigation water required for the crop during this period. (a) Assuming 20% losses of water in the water courses, find duty at the head of the course. (b) Find the duty of the water at the head of the distributary, assuming 10% losses from the distributary head.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

Let us consider in a given area the plantation of a certain crop takes 20 days, and the total water depth required by this crop is 80 cm on the field. Find the duty of irrigation water required for the crop during this period. (a) Assuming 20% losses of water in the water courses, find duty at the head of the course. (b) Find the duty of the water at the head of the distributary, assuming 10% losses from the distributary head.

(a) 182.9 hectares/cumec, 194.4 hectares/cumec

(b) 172.8 hectares/cumec, 185.4 hectares/cumec

(c) 172.8 hectares/cumec, 194.4 hectares/cumec

(d) 185.6 hectares/cumec, 184.6 hectares/cumec

The question was posed to me in final exam.

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

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Greg · Answer 1 · 2023-08-15T07:12:30+0000

Right option is (c) 172.8 hectares/cumec, 194.4 hectares/cumec

Best explanation: Total depth of water needed = 80 cm

Period for which water is needed = 20 days

Duty of irrigation water = (864B/d) = (864 x 20 / 80) = 216 hectares/cumec

(a) Given 20% losses in the watercourse

= 216 x 0.8 = 172.8 hectares/cumec

(b) Given 10% losses in the head of the distributary

= 216 x 0.9 = 194.4 hectares/cumec.

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