Question

For a culturable command area of 1000 hectares with the intensity of irrigation of 50%, the duty on the field for a certain crop is 2000 hectares/cumec. What is the discharge required at the head of the watercourse with 25% losses of water?

• A. 3/16 cumec
• B. 1/4 cumec
• C. 1/3 cumec
• D. 1/2 cumec

Answer 1

The correct option is C 1/3 cumec

The area to be irrigated $=0.5\times 100=500ha$

The discharge needed on the field

$=\frac{500}{2000}=0.25cumec$

For 25% loss of water at the head of water course, the discharge required at the head of water course

$Q=\frac{0.25}{0.75}=\frac{1}{3}cumec$