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When calculating head losses, what Hazen-Williams friction coefficient should I use for concrete pressure pipe?

April 26, 2017calculating coefficient concrete friction Head losses pipe pressure

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When calculating head losses, what Hazen-Williams friction coefficient should I use for concrete pressure pipe?

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The AWWA M9 Manual for Concrete Pressure Pipe recommends, in Chapter 3, Hydraulics, the following Hazen-Williams friction coefficients: Pipe Diameters 16″ thru 48″: 140 Pipe Diameters 54″ thru 108″: 145 Pipe Diameters 114″ and larger: 150