GATE AG 2025 • Q31 NAT • 1 Mark

Section 4: Soil and Water Conservation Engineering

Hydrology

Subtopic: Hydrological cycle and measurement of its components

Question Statement:

An unconfined aquifer, hydraulic conductivity 12 m/day, covers 1.0 ha. Pumping releases 6000 m³ of water and water table drops from 3 m to 7 m below ground. Find the specific yield (%). (Answer in integer)

Official Answer Key:

15

Step-by-Step Solution & Explanation

Specific yield Sy = Volume of water released/(Area × drop in water table) = 6000/(10000×(7−3)) = 6000/40000 = 0.15 = 15%.

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