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Guide for Selecting Manning's Roughness Coefficients for ...
for open-channel flow (Carter and others, 1963), less has been done for densely vegetated flood plains, coefficients for which are typically very different from those for channels. The step-by-step procedures described in this guide outline methods for determining Manning's n values for natural channels and flood plains.
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3.2 Topic 8: Open Channel Flow - University of Texas at Austin
www.caee.utexas.eduFlow in Open Channels: Manning Equation Manning’s equation is used to relate the average channel (conduit) velocity to energy loss, Sf = hf/L. Manning equation (metric units: m, s) UNITS ?!!? Does “n” have units? Tabulated values? 3.7 Manning Equation (Cont.) General case To change to US Customary units multiply by = 1 (metric) or 1.486 ...