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Manning's roughness coefficient for Illinois streams

April 30, 2012

Manning's roughness coefficients for 43 natural and constructed streams in Illinois are reported and displayed on a U.S. Geological Survey Web site. At a majority of the sites, discharge and stage were measured, and corresponding Manning's coefficients—the n-values—were determined at more than one river discharge. The n-values discussed in this report are computed from data representing the stream reach studied and, therefore, are reachwise values. Presentation of the resulting n-values takes a visual-comparison approach similar to the previously published Barnes report (1967), in which photographs of channel conditions, description of the site, and the resulting n-values are organized for each site. The Web site where the data can be accessed and are displayed is at URL

Publication Year 2012
Title Manning's roughness coefficient for Illinois streams
DOI 10.3133/ds668
Authors David T. Soong, Crystal D. Prater, Teresa M. Halfar, Loren A. Wobig
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Data Series
Series Number 668
Index ID ds668
Record Source USGS Publications Warehouse
USGS Organization Illinois Water Science Center