1.

What is Pack Aquifer Ratio?

A. D₅₀ of the gravel / D₅₀ of the aquifer
B. D₅₀ of the aquifer / D₅₀ of the gravel
C. D₆₀ of the aquifer material / D₁₀ of the aquifer material
D. D₆₀ of the gravel / D₁₀ of the aquifer
Answer» B. D₅₀ of the aquifer / D₅₀ of the gravel


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