GATE 2022 AG – Question 59

Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods · 2 marks · Numerical answer

A 70%-efficient sprinkler system irrigates16 ha maize, ET6 mm/day. It operates20 h/day over 10 days. Find system capacity in L/s, to two decimals.

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Correct answer: 18.90 to 19.10

Explanation

Ten-day net demand=.060 m×160000 m²=9600 m³. Gross volume=9600/.70=13714.2857 m³. Available operating time=200 h=720000 s. Capacity=13714.2857/720000×1000=**19.05 L/s**. Efficiency increases required withdrawal, so divide demand by .70.

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