During gravity drainage, the portion of the groundwater that is retained on sediment particle and rock fracture surfaces is called the specific yield.

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During gravity drainage, the portion of the groundwater that is retained on sediment particle and rock fracture surfaces is called the specific retention, not the specific yield. Specific yield refers to the portion of groundwater that can drain out of the material due to gravity.

During Gravity Drainage, the Portion of the Groundwater That Is