The ratio of the volume of water retained against gravity to the total volume is called?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

The ratio of the volume of water retained against gravity to the total volume is called?

Explanation:
Specific retention is the portion of pore water that remains in the soil after gravity drainage. It is the volume of water retained against gravity per unit total soil volume, reflecting capillary forces and surface tension that keep water held in the pore spaces even when gravity would drain freely. This differs from porosity, which is the total pore volume regardless of drainage, and from specific yield, which is the portion that drains under gravity (the drainable porosity). Hydraulic conductivity is about how easily water moves through the material, not about how much water is retained.

Specific retention is the portion of pore water that remains in the soil after gravity drainage. It is the volume of water retained against gravity per unit total soil volume, reflecting capillary forces and surface tension that keep water held in the pore spaces even when gravity would drain freely. This differs from porosity, which is the total pore volume regardless of drainage, and from specific yield, which is the portion that drains under gravity (the drainable porosity). Hydraulic conductivity is about how easily water moves through the material, not about how much water is retained.

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