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Mannings roughness coefficient

Roughness Characteristics of Natural Channels (pdf, USGS water supply paper 1849)

Determinination of the Manning Coefficient... (.djvu, USGS water supply paper 1898-B)

Selecting Manning's Roughness Coefficients for Natural Channels & Flood Plains
         (.djvu version, USGS water supply paper 2339)

Selecting Manning's Roughness Coefficients for Natural Channels & Flood Plains
         (.pdf version, USGS water supply paper 2339, made into pdf by FHWA)

Flow of Water in Channels Protected by Vegetative Linings (ARS, pdf, 5.7 Mb)

Friction Factors for Vegetated Waterways of Small Slope (ARS, pdf, 5.1 Mb)

Channel n-value guide (Faskin)(pdf, 6.4 Mb)

 

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