Darcy-Weisbach Roughness Coefficients for Selected Residue Materials

by John E. Gilley, Univ of Nebraska, Lincoln, United States,
Eugene R. Kottwitz, Univ of Nebraska, Lincoln, United States,
Gary A. Wieman, Univ of Nebraska, Lincoln, United States,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage: Saving a Threatened Resource—In Search of Solutions


A laboratory study is conducted to measure Darcy-Weisbach roughness coefficients for corn, cotton, peanut, pine needles, sorghum, soybeans, sunflower, and wheat residue. Varying rates of flow are introduced into a flume in which selected amounts of residue are securely attached. Roughness coefficients are calculated from measurements of discharge rate and flow velocity. The laboratory data are used to develop regression equations for relating roughness coefficients to Reynolds number and percent residue cover. Accurate prediction of roughness coefficients for residue materials will improve our ability to understand and properly model upland flow hydraulics.

Subject Headings: Flow rates | Model accuracy | Flow measurement | Hydraulic roughness | Water flow | Hydraulic models | Regression analysis | Flumes

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