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3157. Hazen-Williams equation : Equation used in the analysis of pressure pipe systems for calculation of velocity of flow or discharge  and expressed as-
V = k.C.R0.63.S0.54
where, V = flow velocity (m/sec, ft/sec), k = constant (0.85 in SI, 1.32 in FPS), C = Hazen-Williams roughness coefficient (unitless), R = hydraulic radius (m, ft), S = friction slope (m/m, ft/ft).

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