Hazen-Williams Coefficients Table

Fluids Flow Engineering | Hydraulic & Pneumatic Design Engineering,

Hazen-Williams Coefficients Table

The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water . Also, it does not account for the temperature or viscosity of the water.

The following are Typical C factors used in the Hazen–Williams equation, which take into account some increase in roughness as pipe ages are as follows:

Material Hazen-Williams (C)
ABS - Acrylonite Butadiene Styrene 130
Aluminum 130 - 150
Asbestos Cement 140
Asphalt Lining 130 - 140
Brass 130 - 140
Brick sewer 100
Cast-Iron - new unlined 130
Cast-Iron 10 years old 107 - 113
Cast-Iron 20 years old 89 - 100
Cast-Iron 30 years old 75 - 90
Cast-Iron 40 years old 64-83
Cast-Iron, asphalt coated 100
Cast-Iron, cement lined 140
Cast-Iron, bituminous lined 140
Cast-Iron, sea-coated 120
Cast-Iron, wrought plain 100
Cement lining 140
Concrete 120
Concrete lined, steel forms 140
Concrete lined, wooden forms 120
Concrete, old 100 - 110
Copper 130 - 140
Corrugated Metal Pipe 60
Ductile Iron Pipe (DIP) 140
Ductile Iron, cement lined 120
Fiber 140
Fiber Glass Pipe - FRP 150
Fire Hose (Rubber Lined) 135
Galvanized iron 120
Glass 130
Lead 130 - 140
Metal Pipes - Very to extremely smooth 130 - 140
Plastic 130 - 150
Polyethylene 140
Polyvinyl chloride, PVC, CPVC 140
Rusted Steel 140
Steel Coal-Tar Enamel Lined 145 - 150
Steel Forms 140
Steel new unlined 140 - 150
Steel, corrugated 60
Steel, welded and seamless 100
Steel, interior riveted 90-110
Steel, interior riveted, no projecting rivets 110
Steel, projecting girth and horizontal rivets 100
Steel, vitrified, spiral-riveted 90 - 110
Steel, welded and seamless 100
Tin 130
Vitrified Clay 110
Wrought iron, plain 100
Wood (well planed) 130
Wooden or Masonry Pipe - Smooth 120

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