Crystal D. Prater
Teresa M. Halfar
Loren A. Wobig
David T. Soong
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 <i>n</i>-values—were determined at more than one river discharge. The <i>n</i>-values discussed in this report are computed from data representing the stream reach studied and, therefore, are reachwise values. Presentation of the resulting <i>n</i>-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 <i>n</i>-values are organized for each site. The Web site where the data can be accessed and are displayed is at URL http://il.water.usgs.gov/proj/nvalues/.
application/pdf
10.3133/ds668
en
U.S. Geological Survey
Manning's roughness coefficient for Illinois streams
reports