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Roughness coefficients for densely vegetated flood plains

Water-Resources Investigations Report 83-4247

By:
and

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Abstract

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)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Roughness coefficients for densely vegetated flood plains
Series title:
Water-Resources Investigations Report
Series number:
83-4247
Edition:
-
Year Published:
1987
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
viii, 62 p. :ill. ;28 cm.