Discussion
Specific retention is the fraction of the rock's volume that
Answer: A
Correct answer: remains held against gravity after drainage
Specific retention is the water clay-sized surfaces and fine pores hold by molecular attraction and capillarity after gravity has drained what it can. It and specific yield together make up the porosity:
\[ n = S_y + S_r \]In gravel the retention is negligible and almost all the water is recoverable; in clay it is nearly the whole of the porosity, which is why a clay holds so much water and yields none.
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