Appendix H Manning Roughness Coefficients - Hach Sigma 950 Instrument Manual

Appendix H Manning Roughness Coefficients

Closed Conduit - Partly Full
Metal
Steel
Lockbar and welded
Riveted and spiral
Cast Iron
Coated
Uncoated
Wrought Iron
Black
Galvanized
Corrugated
Subdrain
Storm drain
Non-metal
Acrylic
Glass
Wood
Stave
Laminated, treated
Clay
Common drainage tile
Vitrified sewer
Vitrified sewer with manholes, inlets, etc.
Brick
Glazed
Lined with cement
Concrete
Culvert, straight and free of debris
Culvert with bends, connections and some
debris
Sewer with manholes, inlet, etc., straight
Unfinished, steel form
Unfinished. smooth wood form
Non-metal
Concrete
Unfinished, rough wood form
Sanitary sewers coated with sewage slimes 0.012
Paved invert, sewer, smooth bottom
Rubble masonry, cemented
0.010 0.012
0.013 0.016
0.010 0.013
0.011 0.014
0.012 0.014
0.013 0.016
0.017 0.019
0.021 0.024
0.008 0.009
0.009 0.010
0.010 0.012
0.015 0.017
0.011 0.013
0.011 0.014
0.013 0.015
0.011 0.013
0.012 0.015
0.011 0.011
0.011 0.013
0.013 0.015
0.012 0.013
0.012 0.014
0.015 0.017
0.013
0.016 0.019
0.018 0.025
0.014
0.017
0.014
0.016
0.015
0.017
0.021
0.030
0.010
0.013
0.014
0.020
0.017
0.017
0.017
0.015
0.017
0.013
0.014
0.017
0.014
0.016
0.020
0.016
0.020
0.030
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