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The linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil _______

The linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil _______ Correct Answer does not exceed 3mm

In 1892, Allen Hazen concluded that the linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil did not exceed 3mm.

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Who concluded that linear dependency of the velocity and hydraulic gradient existed if the effective size of soil did not exceed 3 mm?
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