Question Bank • QB_IDE_EXP_035 NAT • 1 Mark

Section 5: Irrigation and Drainage Engineering

Groundwater Hydrology

Subtopic: Groundwater occurrence

Question Statement:

An unconfined aquifer has a total porosity $n = 0.35$ and a specific retention $S_r = 0.15$. The specific yield ($S_y$) of the aquifer is ________ (round off to 2 decimal places).

Answer Key:

0.2

Step-by-Step Solution & Explanation

The relationship between porosity $n$, specific yield $S_y$, and specific retention $S_r$ is: $n = S_y + S_r \implies S_y = n - S_r = 0.35 - 0.15 = 0.20$
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