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Guide for Selecting Manning's Roughness Coefficients for Natural Channels and Flood Plains United States Geological Survey Water-supply Paper 2339
Metric Version
Welcome to Manning's Roughness Coefficients for Natural Channels and Flood Plains

Table of Contents U.S. - SI Conversions

Authors: G.J. Arcement, Jr. and V.R. Schneider, USGS NOTE: WSP2339 is the USGS version of FHWA-TS-84-204which 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 conversionprocess.

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 ValuesIrregularity (n1) Variation in Channel Cross Section (n2) Obstruction (n3) Vegetation (n4) Meandering (m)

Flood Plain n Values
Modified Channel Method Adjustment Factors for Flood-Plain n Values Surface Irregularities (m) Obstruction (n3) Vegetation (n4)

Section 3 : Manning's n
Vegetation-Density Method
Techniques for Determining Vegetation Density Indirect Technique Direct TechniquePhotographs of Flood Plains

Section 4 : Manning's n
Procedure for Assigning n Values
Steps for Assigning n Values Reach Subdivision Channel Roughness Flood Plain Roughness Examples of Procedures for Determining n Values

Summary

References Symbols

List of Figures for Guide for Selecting Manning's Roughness Coefficients (Metric) Back to Table of Contents
Figure 1. A Schematic and CrossSections of Hypothetical Reach of a Channel and Flood Plain Showing Subdivisions Used in Assigning n Values Figure 2. Relation of Stream Power and Median Grain Size to Flow Regime (from Simons and Richardson, 1966, Fig. 28) Figure 3. Forms and Bed Roughness in Sand-Bed Channels Figure 4. Effective-drag Coefficient for Verified n Values versus the Hydraulic Radius of Wide, Wooded Flood Plains Figure5. Example Measurement of Vegetation Showing Diameter and Location in Representative Sample Area Figure 6. Cypress Creek Near Downsville, La. (Arcement, Colson, and Ming, 1979a, HA-603, cross-section 3) Figure 7. Bayou de Lourte Near Farmerville, La. (Schnieder and others, 1977, cross-section 2) Figure 8. Bayou de Lourte Near Farmerville, La. (Schnieder and others, 1977, cross-section 3) Figure 9.Bayou de Lourte Near Farmerville, La. (Schnieder and others, 1977, cross-section 3) Figure 10. Coldwater River Near Red Banks, Miss. (Colson, Arcement, and Ming, 1979, HA-593, cross-section 2) Figure 11. Coldwater River Near Red Banks, Miss. (Colson, Arcement, and Ming, 1979, HA-593, cross-section 2) Figure 12. Yockanookany River Near Thomastown, Miss. (Colson, Ming, and Arcement, 1979A, HA-599,cross-section 5) Figure 13. Yockanookany River Near Thomastown, Miss. 1000 m east of area shown in Figure 12. (Colson, Ming, and Arcement, 1979A, HA-599) Figure 14. Flagon Bayou Near Libuse, La. (Arcement, Colson, and Ming, 1979b, HA-604, cross-section 4) Figure 15. Pea Creek Near Louisville, Ala. (Ming, Colson, and Arcement, 1979 HA-608, cross-section 5) Figure 16. Pea Creek Near Louisville, Ala.(Ming, Colson, and Arcement, 1979 HA-608, cross-section 4) Figure 17. Tenmile Creek Near Elizabeth, La. (Arcement, Colson, and Ming, 1979c, HA-606, cross-section 3) Figure 18. Sixmile Creek Near Sugartown, La. (Schneider and others, 1977, cross-section 7) Figure 19. Thompson Creek Near Clara, Miss. (Colson, Ming, and Arcement, 1979b, HA-597, cross-section 9) Figure 20. Thompson Creek Near Clara,...
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