![]() Note that roughness generally decreases with increases in flow and depth. ![]() This feature is very useful for calibrating an unsteady flow model for flows that vary from low to high. It enables the user to adjust roughness coefficients up or down individually as well as a group to calibrate a HEC-RAS model to observed data. The Flow Roughness Change Factors command allows the user to adjust roughness coefficients with changes in flow.
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