Roughness Coefficient Material Selector
Hazen-Williams friction C-factor reference database adjusted for pipeline age and weathering degradation.
Pipeline Age Degradation Estimator
Design C-Factor Target
C = 150
Hazen-Williams Roughness C-Factor Standards
| Material Type | New Condition | 10-Yr Aged | 20-Yr Aged | Friction Loss Index |
|---|---|---|---|---|
| PVC / CPVC / HDPE | 150 | 150 | 150 | Lowest Friction Loss |
| Copper / Brass / Glass | 140 | 135 | 130 | Smooth Flow |
| Smooth Cement-Lined Iron | 140 | 130 | 120 | Moderate Resistance |
| New Welded Steel | 120 | 110 | 100 | Average Friction |
| Unlined Cast Iron | 130 | 100 | 80 | High Corrosion Loss |