GATE AG 2020 • Q31 NAT • 1 Mark

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Drainage coefficient

Question Statement:

The drainage coefficient of a 720 ha watershed is 1.2 cm. Find the design discharge of the drain (m³/s).

Official Answer Key:

1 to 1

Step-by-Step Solution & Explanation

Design discharge = (drainage coefficient in m × area in m²)/(time in seconds, taken as 1 day) = (0.012×720×10,000)/(24×3600) = 86,400/86,400 = 1.00 m³/s.

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