Mannings Roughness Coefficient
Mannings roughness coefficient values for some common materials
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Manning's roughness coefficient values are used in the Manning's formula for flow calculation in open flow channels. Coefficients for some common used surface materials can be found in the table below:
| Surface Material | Manning's Roughness Coefficient - n - |
| Asbestos cement | 0.011 |
| Brass | 0.011 |
| Brick | 0.015 |
| Cast-iron, new | 0.012 |
| Concrete - Steel forms | 0.011 |
| Concrete - Wooden forms | 0.015 |
| Concrete - Centrifugally spun | 0.013 |
| Copper | 0.011 |
| Corrugated metal | 0.022 |
| Galvanized iron | 0.016 |
| Lead | 0.011 |
| Plastic | 0.009 |
| Steel - Coal-tar enamel | 0.010 |
| Steel - New unlined | 0.011 |
| Steel - Riveted | 0.019 |
| Wood stave | 0.012 |
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