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I I I I I I I I I I I I I I I I I I I VI-2 The proposed reservoir improvements and detention facility construction may be undertaken at any time. Because they retard flood waters, their up- stream location should not increase the liability of the governments. construction costs but they are most heavily populated and im- provements would be highly visible to the community. The recommended pri ority of improvements shoul d be cons i stent with the aforementioned guidelines. The plan of implementation distributes the cost of improvements and therefore mi nimi zes the impacts on the budgets of the sponsors. It al so prov i des a systematic approach to the reduct i on of potential damages along Ralson, Van Bibber and Leyden Creeks. 5. Improve the upstream reaches of Leyden Creek and Van Bibber Creek as development in these reaches occurs. This also provides the opportunity for cost participation by those developing the pro- perties which would be benefited. 1. Improve Leyden Lake. This maintains the status quo with respect to flood flows and insures the continued safety of the facility. 6. When multi-purpose funds are available, the soccer field complex property should be purchased and the Oak Street detention facility should be constructed. This would provide an increased level of protection through the shopping center area and would preserve the open space/recreational uses presently occurring on the site. This type of use is an ideal multi-use application for flood prone properties. 2. Construct the improvements recommended through the Arvada Shopping Center and the confl uence area of Ral ston and Van Bibber Creeks. This area is subject to the most intense damages in the entire study. This would eliminate damages from this area for all events less than the 15-year event assuming a fully developed upstream basin. 7. The 58th Avenue and Eldridge area should be improved as recom- mended. This would correct existing problems due to imprudent development and woul d red uce further problems associ ated with future developments. 3. Implement a right-of-way acquisition program for the downstream reach of Ralston Creek, from Old Wadsworth to Clear Creek, to purchase property along the proposed improvements as they become available. This would distribute these costs over time and would enhance the affordability of the construction of improvements. It would also help to mitigate any potential increased hazard which might occur as a result of upstream improvements. As additional funds become available and the flood hazard justifies expendi- tures, the lower reacheS of the proposed Ralston Creek improve- ments can be constructed. The overall design in terms of 1985 dollars, would result in a project cost of approximately $33,000,000 including right-of-way and contingencies. This is a preliminary cost estimate. No guarantees are associated with the est imated costs even though the cost est imate represent best avail ab 1 e knowl edge. Table VI-1 is attached which presents a quiCk reference source for major project features of the preliminary design. 4. Begin a phased construction program for the reach of Ral ston Creek from Van Bibber Creek to Leyden Creek and on Leyden Creek from Ral ston Creek to the Arvada city limits. These reaches have high The present prel iminary design of the proposed flood control project dif- fers substantially from the earlier plans developed by Wright-McLaughlin Engineers and Frasier and Gingery Engineers about ten years ago. The 1985 design was able to call upon features of the former engineering work to optimize the design strategy. For instance in 1977 it was not known that Leyden Lake was unsafe and that it was bei ng re-eval uated for poss ib 1 e