GATE CE 2015 Set 2 — Question 29
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Water Resources Engineering → Hydrographs & Groundwater → Aquifers
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Question
The relationship between porosity (), specific yield () and specific retention () of an unconfined aquifer is:
Correct answer
(A) S_y + Sᵣ = n
Solution
Porosity () represents the total volume of void space in a soil or rock sample. In an unconfined aquifer, this void space is occupied by water. When the aquifer is drained under gravity, the volume of water that is released is called the specific yield (), and the volume of water that remains held in the voids against gravity due to surface tension and molecular attraction is called the specific retention (). Therefore, the total porosity is the sum of the specific yield and specific retention: .
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