Hydraulic roughness

Hydraulic roughness is the measure of the amount of frictional resistance water experiences when passing over land and channel features.^[1] One roughness coefficient is Manning's n-value.^[2] An increase in this n value will cause a decrease in the velocity of water flowing across a surface.^[3]

References

1. ^ http://books.google.com/books?id=SEEis576a5sC&pg=PA14
2. ^ http://wwwrcamnl.wr.usgs.gov/sws/fieldmethods/Indirects/nvalues/ Verified Roughness Characteristics of Natural Channels]
3. ^ http://books.google.com/books?id=F6nx06oYabUC&lpg=PA291&ots=I4EwVW-mho&dq=measurement%20and%20analysis%20of%20alluvial%20channell%20form&pg=PA294#v=onepage&q&f=false

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