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What is gravel-sand size Ratio according to Maly?

What is gravel-sand size Ratio according to Maly? Correct Answer Smallest gravel size/10 percentile sand size

Gravel-sand size Ratio according to Maly is the ratio of Smallest gravel size to the 10 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore.

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