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<br />In bends, superelevation of the flow surface may occur on the <br />outside bank, which may be estimated by the equation: <br /> <br />e <br /> <br />t.y = <br /> <br />v2T <br />gR <br />o <br /> <br />.~ <br /> <br />where: <br /> <br />t.y <br />V <br />T <br />g <br />lb <br /> <br />= <br /> <br />superelevation of the water surface, ft. <br />mean velocity, fps <br />surface width of the channel, ft. <br />gravitational acceleration, 32.2 ft/sec2 <br />mean radius of the bend, ft. <br /> <br />~ <br /> <br />= <br /> <br />= <br /> <br />= <br /> <br />= <br /> <br />t.y must be considered in selecting channel freeboard for the <br />outside bank. <br /> <br />IV. Design Procedures <br /> <br />This section outlines the design procedure for flexible channel <br />linings and the design procedures for providing protection for <br />channel bends and for channels with steep side slopes. <br /> <br />Flexible Lining Design <br /> <br />e <br /> <br />The design c msis ts of the following steps: <br /> <br />1. Perform hydrologic computations. <br /> <br />2. Select design flows for permanent lining material and <br />for temporary linings. <br /> <br />3. Estimate soil erodibility. <br /> <br />4. Define channel shape, slope, and maximum top width., <br /> <br />5. Select least costly permanent lining material available. <br /> <br />... <br /> <br />6. Determine ~x for the selected lining, slope, and <br />soil erodibility from the Maximum Permissible Depth <br />Charts. <br /> <br />." <br /> <br />7. Determine hydraulic radius, R, and area, A, for the <br />selected channel geometry and ~x' (Chart 1 or <br />calculations) . <br /> <br />e <br /> <br />14 <br />