The volume of water a unit volume of an aquifer releases under gravity drainage is called ____________________?
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Answer: B. Specific yield
Explanation
Specific yield measures the volume of water an unconfined aquifer releases under gravity drainage. It represents the ratio of drained water volume to total aquifer bulk volume. This parameter accounts for water retained by capillary forces against gravitational pull. Aquifers store vast quantities of groundwater within interconnected pore spaces and fractures. Specific retention represents the water fraction held back by capillary forces in the aquifer. Porosity equals the sum of specific yield and specific retention parameters combined.
Hydrogeologists use specific yield values to estimate extractable groundwater storage volumes. Pumping test analysis relies on specific yield to predict drawdown and wellfield productivity. Understanding aquifer storage properties is vital for sustainable groundwater resource management. Option A is an incorrect hydrological term not used in standard groundwater equations. Option C measures the water retained by capillary forces rather than gravity drainage yield. Option D is incorrect because only specific yield defines gravity drainage volume.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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