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<br /> <br />I <br />I r <br />S <br />I S. <br />SF <br /> So <br />I s. <br />T <br />I Vb <br />V. <br /> V <br />I W <br />Y <br />I Y. <br />Yr <br /> Yem <br />I Yct <br />Ym <br />I Yo <br />Yp <br /> Ytw <br />I Y1 <br />I Y2 <br />Z <br />I Zr <br />Z, <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />channel centerline radius of curvature <br />Slope <br />Energy Grade line Slope <br />Safety facotr (with regard to riprap) <br />Bed or drop slope (also S used) <br />Density of sediment or rock <br />Top width of flow in the channel <br />Velocity on the slope (COE) generally taken as V average <br />Shear Velocity <br />Velocity of flow in feet per second <br />Width <br />Depth of flow <br />Critical flow depth <br />Vertical fall at a drop <br />Critical depth at a drop in the main channel <br />Critical depth at a drop in the trickle channel <br />Minimum depth on face of sloping drop (See Ref. 25) <br />Normal depth <br />At a vertical drop, the pool depth under the nappe just below the crest <br />Actual tailwater depth present downstream of the drop <br />At a vertical hard drop, the depth of flow immediately downstream of the <br />point where the nappe contacts the basin, or at the toe of a sloping drop <br />The tailwater depth required to causeajump to form immediately downstream <br />of the sequent depth location for Y 1 <br />Channel side slope vertical ratio distance <br />Drop face slope <br />Side inverse slope <br />Angular variation of sidewall with respect to channel centerline <br />Kinetic energy coefficient <br />Standing wave front angle <br />Correction factor for IS, <br />Shear stress on the bed caused by the flow of water <br />Specific weight <br />Angle of inflow at confluences <br />