For design of gravity main ...

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For design of gravity main use the Darcy's modified formula  d^5=(FLQ^2)/3Hf where d = pipe inner dia in meters, F= frictional constant dimensionless, take its value at 0.01, L= length of pipe line in meters, Q= discharge in cubic meters/sec, Hf= Level difference i.e. available head in meters. We have practically got great success with this formula for gravity line design. Write for any clarification east5star@gmail.com