GUIDE FOR SELECTING MANNING'S ROUGHNESS …

Authors: Arcement, Jr. and Schneider, USGS NOTE: WSP2339 is the USGS version of FHWA-TS-84-204 which has the same title. The publications are substantially the same, but have different arrangement of figures. DISCLAIMER: During the editing of this manual for conversion to an electronic format, the intent has been to convert the publication to the metric system while keeping the document as close to the original as possible. The document has undergone editorial update during the conversion process. GUIDE for SELECTING MANNING'S ROUGHNESS Coefficients for Natural Channels and Flood Plains United States Geological Survey Water-supply Paper 2339 Metric VersionWelcome to MANNING'S ROUGHNESS Coefficients for Natural Channels and Flood Plains Table of Contents - SI Conversions Table of Contents for GUIDE for SELECTING MANNING'S ROUGHNESS Coefficients (Metric) List of Figures List of Tables List of Equations Cover Page : GUIDE for SELECTING MANNING'S ROUGHNESS Coefficients (Metric) Section 1 : MANNING'S n Abstract Introduction Methods Channel n Values Base n Values (nb) for Channels Section 2 : MANNING'S n Adjustment Factors for Channel n Values Irregularity (n1) Variation in Channel Cross Section (n2) Obstruction (n3) Vegetation (n4)

It would be impractical in this guide to record all that is known about the selection of the Manning's roughness coefficient, but many textbooks and technique manuals contain discussions of the factors involved in the selection. Three publications that augment this guide are Barnes (1967), Chow (1959), and Ree (1954).

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