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Mannings N: table 2
h. Dressed ashlar/stone paving to j. Vegetal lining
Manning's n roughness coefficients for open channels and closed conduits — used in hydraulic flow calculations
| section | description | n max (dimensionless) | n min (dimensionless) | n normal (dimensionless) | subcategory |
|---|---|---|---|---|---|
| table 2 | h. Dressed ashlar/stone paving | 0.017 | 0.013 | 0.015 | g. Masonry |
| table 2 | h. very weedy reaches, deep pools, or floodways with heavy stand of timber and underbrush | 0.15 | 0.075 | 0.1 | 1. Main Channels |
| table 2 | j. Vegetal lining | 0.5 | 0.03 | — | i. Asphalt |
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