Water-Supply Paper 2339, "Guide for Selecting Manning's Roughness Coefficients for Natural Channels and Flood Plains,"



In Reply Refer To:
WGS-Mail Stop 415                           July 23, 1990




OFFICE OF SURFACE WATER MEMORANDUM NO. 90.16

Subject:  PUBLICATIONS--Water-Supply Paper 2339, "Guide for
                        Selecting Manning's Roughness Coefficients
                        for Natural Channels and Flood Plains," by
                        George J. Arcement, Jr., and Verne R.
                        Schneider

This memorandum makes initial distribution of the subject Water-
Supply Paper.  Additional copies can be obtained by using the
Publications Guide procedures for ordering copies of reports.
These procedures appear in articles 8.02.1 and 8.02.2 of the
Guide.

Water-Supply Paper 2339 presents step-by-step procedures for
selecting Manning's roughness coefficient, n, for natural channels
and flood plains.  Photographs of flood-plain segments can be used
for comparison with similar flood plains to aid in assigning n
values.

This document differs from other publications on n values in that
it deals with densely-vegetated flood plains.  The n value for
this type of flood plain can be determined by measuring the vege-
tation density of the flood plain.

Water-Supply Paper 2339 was prepared in cooperation with the
United States Department of Transportation, Federal Highway
Administration.  It is another notable product of this long-
standing and productive cooperative effort with the Federal
Highway Administration.




                           Charles W. Boning
                           Chief, Office of Surface Water

WRD Distribution:  FO-LS, SL


SELECTED LIST


Surface-Water Specialist, NR
Surface-Water Specialist, SR
Surface-Water Specialist, CR
Surface-Water Specialist, WR
Regional Research Hydrologist, NR
Regional Research Hydrologist, CR
Regional Research Hydrologist, WR