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Question

# What will be the head discharge of a canal required for the crops listed below. The time factor may be assumed as 0.75. Crop Base period Area(ha) Duty(ha/ cumecs) Rice 120 4000 1200 Wheat 120 5000 1800 Sugarcane 310 3000 1200

A
8.61 cumecs
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B
6.41cumecs
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C
7.77 cumecs
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D
11.48 cumecs
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Solution

## The correct option is C 7.77 cumecsDischarge required: For Rice =40001200=3.33 cumecs (Q1) For Wheat =50001800=2.78 cumecs(Q2) For Sugarcane =30001200=2.5 cumecs(Q3) As base period of sugarcane is 310 days, it will require water in both crop seasons i.e., Rabi and Kharif. Hence, discharge required =max (Q1+Q3,Q2+Q3) =max(3.33+2.5,2.78+2.5) =3.33+2.5=5.83 cumecs Head discharge of canal required =5.830.75=7.77 cumecs

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