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<br />q Discharge per unit width <br />R Hydraulic radius <br />Re Reynolds number <br />r Radius; cylindrical coordinate <br />S Slope <br />Sf Slope of energy grade line <br />So Slope of the bed <br />Sw Slope of the water surface <br />T Top width of water surface <br />TW Tailwater Depth <br />t Time variable; thickness dimension <br />V Mean velocity <br />Ii Volume <br />v Velocity at a point <br />W Transverse dimension; width <br />w Weight <br />y Depth of flow <br />Ye Equivalent depth = (A/2)I/Z <br />Ym Hydraulic depth: area/top width (A/T) <br />Yn Normal depth of flow <br />Yc Critical depth of flow <br />z Side slope; stream bed elevation <br />Z Water surface elevation <br /> <br />vi <br />