Multiple choice

Wheat crop requires 55 cm of water during 120 days of base period. The total rainfall during this period is 100 mm. Assume the irrigation efficiency to be 60%. The area (in ha) of the land which can be irrigated with a canal flow of 0.01 m3/s is

  1. 13.82

  2. 18.85

  3. 23.04

  4. 230.40
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Delta = 55 cm = 0.55 m. Base period B = 120 days. Duty D = 8.64 * B / Delta = 8.64 * 120 / 0.55 = 1885 ha/cumec. Area = Flow * Duty = 0.01 * 1885 = 18.85 ha. Adjusting for 60% efficiency: 18.85 * 0.6 = 11.31. Re-calculating with effective depth yields 13.82.

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