At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

Question

At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

asked Aug 15, 2023 in Irrigation Engineering by Carter (75.2k points)

At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

(a) 185.14hectares/cumec

(b) 186.25hectares/cumec

(c) 187.45hectares/cumec

(d) 184.89hectares/cumec

I got this question in an interview.

The above asked question is from Design Capacity for an Irrigation Canal in portion Sediment Transport and Irrigation Channels Design of Irrigation Engineering

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Greg · Answer 1 · 2023-08-16T04:23:15+0000

The correct choice is (a) 185.14hectares/cumec

For explanation: Total depth of water required = 90 cm

Useful rainfall = 20 cm

Extra water depth needed after useful rainfall = 90 – 20 = 70 cm

Period for which water is needed = 15 days

Duty of irrigated water (∆) = (864B/d) = (864 x 15 / 70) = 185.14 hectares/cumec.

At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

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