In construction of gravel packed wells, the pack-aquifer ratio is generally defined as ______.
Options:
(A) 50% of the size of gravel pack / 50% of the size of aquifer
(B) 60% of the size of gravel pack / 10% of the size of aquifer
(C) 50% of the size of aquifer / 50% of the size of gravel pack
(D) 60% of the size of aquifer / 10% of the size of gravel pack
Official Answer Key:
A
Step-by-Step Solution & Explanation
• Standard groundwater engineering definition: the pack-aquifer ratio is the ratio of the 50%-passing (D50) grain size of the gravel pack material to the 50%-passing (D50) grain size of the natural aquifer material.
• This directly matches option (A). The other options invert the ratio or use non-standard percentage pairs (60%/10%).
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