1.

The diameter of an open well in coarse sand for a yield of 0.0033 cumec, when operated under a depression head of 3 min a medium of specific capacity (C'/A) 1 cumec/h/m2/m is

A. 2/π0.5
B. 2/π
C. 4/π0.5
D. 4/ π
E. 6/π0.5
Answer» D. 4/ π


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