The handbook of Technical irrigaTion informaTion - Hunter Industries
The handbook of Technical irrigaTion informaTion - Hunter Industries
The handbook of Technical irrigaTion informaTion - Hunter Industries
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Handbook <strong>of</strong> <strong>Technical</strong> Irrigation InformationRoughness Coefficient C Values for Hazen-Williams EquationValues <strong>of</strong> C Type Of Pipe Range New Pipe Design CPVC 160 - 145 150 150Polyethylene 150 - 130 140 140Asbestos-Cement 160 - 140 150 140Cement-Lined Steel 160 - 140 150 140Welded Steel 150 - 80 140 100Riveted Steel 140 - 90 110 100Concrete 150 - 85 120 100Wrought or Cast Iron 150 - 80 130 100Copper, Brass 150 - 120 140 130Wood Stave 145 - 110 120 110Vitrified Clay 110 100Corrugated Steel 60 60Above values <strong>of</strong> C for use with Hazen-Williams Equation, friction head losses in PSI per foot <strong>of</strong> pipe length forfresh water at 60 degrees Fahrenheit.H f = 0.00090194 (100 ) 1.852 Q 1.852C d 4.866Where:H f = head loss due to friction in pounds per square inch (PSI)C = Hazen Williams coefficient for roughness <strong>of</strong> the inside <strong>of</strong> the pipeQ = flow in gallons per minute (GPM)d = inside diameter <strong>of</strong> pipe in inchesL = length <strong>of</strong> pipe in feet126
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