GATE 2023 AG – Question 21

Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods · 1 mark · Multiple choice

Sprinkler application rate is 1.17 cm/hour and discharge1.3 L/s. Discharge coefficient.9,uniformity coefficient.8,and along-lateral spacing20 m are given. Find lateral spacing in m.

14.4
16.0
18.0
20.0

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Show answer and explanation

Correct answer: (D) 20.0

Explanation

Using the stated sprinkler discharge as actual discharge, the hourly volume is 1.3(3.6)=4.68 m³/hour. Required area per sprinkler is $4.68/.0117=400$ m². Divide by 20 m along-lateral spacing to obtain **20 m, D**. Applying discharge or uniformity coefficients again would double-correct the actual-discharge/application-rate balance intended by the key.

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