+1 vote
in Irrigation Engineering by (75.2k points)
The CCA of a water course is 1500 hectares. The intensity of sugarcane and wheat crops is 20% and 40% respectively. The duties for the crops at the head of the watercourse are 730 hectares/cumec and 1600 hectares/cumec respectively. Calculate the design discharge at the outlet assuming a time factor equal to 0.8.

(a) 0.55 cumec

(b) 1.0 cumec

(c) 0.72 cumec

(d) 0.92 cumec

The question was asked during a job interview.

Question is taken from Canal Irrigation System topic in section Canal Irrigation System of Irrigation Engineering

1 Answer

0 votes
by (106k points)
Right option is (c) 0.72 cumec

For explanation: Area to be irrigated under sugarcane = 1500 x 20/100 = 300 hectares

Area to be irrigated under wheat = 1500 x 40/100 = 600 hectares

Discharge required for sugarcane = 300/730 = 0.410 cumec

Discharge required for wheat = 600/1800 = 0.333 cumec

The discharge required at the head of the water course = 0.410 + 0.333 = 0.743 cumec

The actual design discharge at the outlet = 0.743/0.8 = 0.92 cumec.

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