| Absolute Pipe Roughness |
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| Included here is a sampling of absolute pipe roughness e data taken from Binder (1973). These values are for new pipes; aged pipes typically exhibit in rise in apparent roughness. In some cases this rise can be very significant. |
| Pipe Material | Absolute Roughness, e | |
| x 10-6 feet | micron (unless noted) | |
| drawn brass | 5 | 1.5 |
| drawn copper | 5 | 1.5 |
| commercial steel | 150 | 45 |
| wrought iron | 150 | 45 |
| asphalted cast iron | 400 | 120 |
| galvanized iron | 500 | 150 |
| cast iron | 850 | 260 |
| wood stave | 600 to 3000 | 0.2 to 0.9 mm |
| concrete | 1000 to 10,000 | 0.3 to 3 mm |
| riveted steel | 3000 to 30,000 | 0.9 to 9 mm |
| Relative pipe roughness is computed by dividing the absolute roughness e by the pipe diameter D, |
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