GATE AG 2020 • Q30 NAT • 1 Mark

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Types of wells

Question Statement:

A tubewell discharges 40 m³/h and operates 20 h/day during the irrigation season. Irrigation interval = 20 days, depth of irrigation = 8 cm. Find the command area of the tubewell (ha).

Official Answer Key:

20 to 20

Step-by-Step Solution & Explanation

Volume supplied per irrigation cycle = discharge×hours/day×days = 40×20×20 = 16,000 m³. Depth applied per ha = 0.08 m × 10,000 m² = 800 m³/ha. Command area = 16,000/800 = 20 ha.

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