Discussion
The specific yield value of an aquifer is always ______, as some water is retained in the aquifer by molecular and surface tension forces.
Answer: B
The specific yield of an aquifer is always less than its porosity. Porosity is the fraction of the total volume that is voids. Specific yield is only the part of the water that drains out by gravity. The rest, the specific retention, stays held by molecular attraction and surface tension on the grains, so \(S_y = n - S_r\), which is less than n. It can approach porosity only for very coarse gravel. It is never greater than the porosity, and it is not equal to it or its inverse.
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