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Roughness coefficients for densely vegetated flood plains

January 1, 1994

Although much research has been done on Manning 's roughness coefficients for stream channels, very little has been done on the selection of roughness values for densely vegetated flood plains. In this report four method for determining roughness coefficients for flood plains are examined and evaluated. Field data were collected at 13 sites on wide, densely vegetated flood plains where verified n values were known. The ' vegetation density ' of representative sample areas was measured at each site for use in determining roughness coefficients. The vegetation density method, proved to be useful in determining n values for wide, densely wooded plains. By measuring the area occupied by tree trunks and vegetation in a representative sample area, the vegetation density can be determined. Using the vegetation density in an equation developed from Manning 's formula, the Manning 's n can be determined for the representative sample area. (USGS)

Citation Information

Publication Year 1987
Title Roughness coefficients for densely vegetated flood plains
DOI 10.3133/wri834247
Authors G.J. Arcement, V.R. Schneider
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Water-Resources Investigations Report
Series Number 83-4247
Index ID wri834247
Record Source USGS Publications Warehouse