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In Chezy’s formula $${\text{V}} = {\text{C}}\sqrt {{\text{rs}}} $$   for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

In Chezy’s formula $${\text{V}} = {\text{C}}\sqrt {{\text{rs}}} $$   for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is Correct Answer $$\frac{{\text{D}}}{4}$$

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In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is
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