by Andrew J. Bowie, USDA Natl Sedimentation Lab, United States,
n Values in Natural and Dredged Channels
Abstract: Manning's n values were determined for three stream channels in two complex watersheds in North Mississippi. The study covered a wide range of channel conditions and flow parameters. A representative storm from each channel was selected for this report. Results of this study show that channel n values change considerably as a runoff event progresses. Also, n values do not always follow the same pattern for streams of similar drainage complexity. The variation of resistance is apparently from changes in the effective channel roughness caused by modification of the channel bed configuration and by differing degrees of bank submergence as the runoff event progresses.
Subject Headings: Channel flow | Flow resistance | Dredging | Comparative studies | Fluid flow | Water flow | Submerged flow | Drag (fluid dynamics) | Runoff | Stream channels | Mississippi
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