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GATE 2026 CE (CE1) – Question 17

Irrigation · Irrigation systems and methods, crop water requirements · 1 mark · Multiple choice

An irrigation canal is to be designed to deliver 10 cumec to meet the peak demand of 7500 hectare of cropped area. The estimated canal losses are 50 % of the head discharge. The duty (in hectare/cumec) on capacity of this canal is

  1. 375
  2. 1125
  3. 1500
  4. 1875

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Correct answer: (A) 375

Explanation

The delivered flow is 10 cumec and the losses are half of the head discharge, so the head discharge must be $10 \div 0.5 = 20$ cumec. The duty on capacity is the area served per cumec of the canal's head discharge, which is $\frac{7500}{20} = 375$ hectare per cumec.