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<br />material built to above the top of bank, to act as a dike. <br />An area along the bank where return irrig~tion flows empty <br />into the Gunnison River upstream of the plant also provides <br />opportunity for riverflows to exit the bank. This area <br />requires attention to prevent breakout o:Eriverflows and <br />consequent flanking of the treatment plant. <br /> <br />The solution viewed as most appropriate for this area <br />is to further stabilize existing protection by placement of <br />intermediate stonE' sizes into the voids of the large <br />riprap. In addition, the area vulnerable .to breakout of <br />flows could be provided with a segment of levee connecting <br />the existing levee with a hard-point located upstream. The <br />connecting levee would prevent flanking of the established <br />levee during flooc:flows. <br /> <br />13. Conclusions. <br /> <br />This study has evaluated some of the Confluence Park <br />features which arE of high priority for installation by the <br />City of Delta. The features were evalua1:eid according to <br />their vulnerability to floods and other hydraulic actions <br />such as erosion and sedimentation. Evaluations included <br />presentation of alternative plans which would avoid <br />water-related damages to varying degrees. . Some evaluations <br />presented conceptual solutions where alte~natives appeared <br />inappropriate; however, the "do nothing" alternative should <br />always be considered along with its inherent risks. <br /> <br />The specific park features addressed in the study <br />included the old sewage lagoon to be converted to a fish <br />pond, the diversicn facility for the fishpond, the boat <br />launch, lime material at the site, and the unstable banks on <br />the rivers. In addition, the study addregsed the current <br />and potential hydrology and flood plain of the Gunnison <br />River, localized river characteristics, seepage potential of <br />the fish pond, emergency outfall and over:t;low features for <br />the fish pond, and some considerations for the waterfowl <br />area as well as the outfall to the river from the waterfowl <br />pond area. <br /> <br />No recommenda.tions for pursuing any individual <br />alternative is provided. The selection of features must be <br />made by the City of Delta in the context df 'their needs and <br />abilities to accept the appropriate risks wi'th each <br />alternative. <br /> <br />Features should be designed by the city of Delta or its <br />consultants. The design examples and aids provided to the <br />city are intended only as assistance toward design and do <br />not constitute complete consideration of all factors <br />required for final-design. <br /> <br />28 <br />