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<br />'Defined as: <br /> <br />Froude Number <br /> <br />v " ~J.. ~~O..f <br />F- - <br />- .J gD - a"'; lJ-,~ '" <br /> <br /> <br />Where v = mean velocity, g = acceleration of gravit <br />and D = average depth in the cross section. <br /> <br />A Froude number> 1 means supercritical or rapid flow <br />A Froude number < 1 means subcritical or tranquil flow <br /> <br />A Froude number = 1 means critical flow <br /> <br />Some researchers argue that supercritical flow is uncommon <br />for long reaches of channel, especially in Colorado <br />mountain streams where roughness values are high. <br />