Hazen Williams C: concrete_cylinder_pipe
Hazen-Williams roughness coefficients (C values) for pressure pipe hydraulic calculations. Covers new and aged pipe materials: ductile iron (cement-lined/unlined), cast iron at 0/5/10/20/30/40 years, carbon steel (new/corroded/lined), copper, brass, PVC, HDPE, CPVC, FRP, concrete, asbestos cement, galvanized steel, stainless steel, lead, vitrified clay. Includes AWWA M31 and NFPA 13 design C values. C value ranges (min/typical/max) and recommended design values are provided.
| pipe material | pipe condition | c value max (dimensionless) | c value min (dimensionless) | c value typical (dimensionless) | design c value (dimensionless) | notes |
|---|---|---|---|---|---|---|
| concrete_cylinder_pipe | aged | 130 | 100 | 115 | 110 | Mortar joints and aging; slight roughening; design C=110 conservative for older pre-stressed concrete cylinder pipe |
| concrete_cylinder_pipe | new | 140 | 120 | 130 | 130 | AWWA C300/C301/C302/C303 concrete cylinder or prestressed; rough aggregate-cement surface; C varies with joint and lining quality |
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