GATE CE 2021 Set 2 — Question 60
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Water Resources Engineering → Irrigation Systems & Water Need → Base Period
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Question
A reservoir with a live storage of 300 million cubic metre irrigates 40000 hectares (1 hectare = m) of a crop with two fillings of the reservoir. If the base period of the crop is 120 days, the duty for this crop (in hectares per cumec, round off to integer) will then be ________________.
Correct answer
689 to 693
Solution
1.Calculate the total volume of water available:
The reservoir has a live storage of 300 million m and is filled twice.Total volume = m.
2.Calculate the Delta ():
Delta is the total depth of water required by the crop over the base period.Area irrigated = 40,000 hectares = m m.
3.Calculate the Duty ():
The relationship between Duty ( in hectares/cumec), Base period ( in days), and Delta ( in metres) is:Given days and m:
4.Final Answer:
Rounding off to the nearest integer, the duty is 691.Continue learning with Success Tracker
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