This question was previously asked in

ESE Civil 2014 Paper 2: Official Paper

Option 2 : 3.0 Mm^{3}

CT 1: Ratio and Proportion

2846

10 Questions
16 Marks
30 Mins

**Concept:**

**Specific yield **is defined as the volume of water released from storage by an unconfined aquifer per unit

surface area of aquifer per unit decline of the water table.

When the above statement is expressed in quantitative form, it will be as below-

Volume of water lost = Specific yield × Drawdown × Area

__Calculation:__

Porosity = 35%,

Permeability = 40 m / day,

Specific yield = 0.15

Area = 100 km^{2}

Drawdown = 0.2 m

Volume of water lost = Specific yield × Drawdown × Area

∴ Volume of water lost = 0.15 × 0.2 × 100 × 10