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The term which is collectively responsible, along with specific yield, for total porosity of an aquifer is __________

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The term which is collectively responsible, along with specific yield, for total porosity of an aquifer is __________

(a) Unit yield

(b) Specific retention

(c) Unit retention

(d) Specific allowance

I got this question in an international level competition.

My question is from Types of Aquifer and Aquifer Functions topic in section Groundwater of Engineering Geology

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Correct option is (b) Specific retention

To elaborate: Specific retention is the term used to express the amount of water retained by a unit volume of aquifer after allowing gravity drainage through it. Thus, specific yield and specific retention together sum up to the total porosity of an aquifer.

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