Question

What is the quantity of water that a unit volume of aquifer drains by gravity called?

(a) Porous volume

(b) Water yield

(c) Specific yield

(d) Unit yield

The question was asked during a job interview.

I'm obligated to ask this question of Types of Aquifer and Aquifer Functions in portion Groundwater of Engineering Geology

Answer 1

Right answer is (c) Specific yield

To explain: The water is released by aquifer under the force of gravity and depends both on the quantity and quality of the pores and other openings present in the rock. It is called specific yield and may be defined as “the quantity of water that a unit volume of aquifer drains by gravity.”