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What is gravel-sand size Ratio according to Saucier?

What is gravel-sand size Ratio according to Saucier? Correct Answer 50 percentile gravel/ 50 percentile sand

Gravel-sand size Ratio according to Saucier is the ratio of 50 percentile gravel size to the 50 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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