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Mannings roughness coefficient

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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)

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

 

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