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low flow channel and part of the high flow would be submerged. During run -.off the high flow <br />channel would create a larger, more usable hydraulic feature (a hydraulic jump or wave train), <br />and at extreme flood the river will overflow the shoulders of the structure. The downstream side <br />of these shoulders are stepped to provide seating during normal flows and to prevent the <br />formation of dangerous hydraulics during extreme flooding. <br />Figure 4.. The downstream view of the U- structure shows how it is designed to accommodate <br />varying flow levels. <br />Lower Flows <br />Water at low flows will be controlled and diverted throughout the Boating Parks and will <br />not be wasted. The low flow rate for which the Boating Parks were designed was based on basic <br />hydraulic formulas coupled with a working knowledge of this segment of the Arkansas River and <br />its characteristics. The structures and their elevation/configuration were designed to provide <br />depth for boating during low flows even when the whitewater wave features are not present. <br />Higher Flows <br />The primary purposes of the Salida and Buena Vista Boating Parks are to provide a <br />recreation experience for tubers, rafters, canoers, kayakers and other boating enthusiasts. The <br />Boating Parks on the Arkansas River are designed to be a usable attraction for top level kayakers <br />and other boaters at flow rates of 1800 cfs and greater. Design of the structures in the Boating <br />Parks were based on basic hydraulic formulas coupled with a working knowledge of this <br />segment of the Arkansas River and its characteristics. At high flow rates, the waveforms; <br />hydraulics, eddies, and holes become more powerful and are conducive to play- boating, slalom <br />boating, and squirt boating. The structures that will create these features are hydraulically and <br />structurally sound, with anchors into the bed and banks of the river made of large stone and <br />concrete and are designed to withstand the rigors of high and flood flows. <br />-11- <br />