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<br />, I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Sand Creek: This project received the second highest score because it provides a relatively large <br />benefit, offers multiple uses, and may include sources of funding other than the City and the Colorado <br />Water Conservation Board. It should be noted, however, that the additional funding will probably be <br />very small in relation to the overall cost of the project. In fact, the overall cost of the project may be <br />such a limiting factor that the City can not afford to construct these improvements at all. <br /> <br />The project has two key elements which include the dam and the outfall channel. The dam, spillway, <br />and outlet works will have to be constructed as one project and can not be phased. However, the <br />project could be constructed without a permanent reservoir or ground water recharge area which would <br />reduce the overall cost of the project. The outfall channel offers little benefit if the dam is not in place <br />because the dam would reduce the 100-year peak discharge from 4,400 cfs to about 225 cfs. If the <br />project is constructed in phases, then the following sequence is recommended: <br /> <br />I. Dam <br />2. Outfall Channel <br />3. Groundwater Recharge Zone <br />4. Permanent Reservoir <br /> <br />Pioneer Ditch: The Pioneer Ditch project received the lowest score for several reasons. It has a <br />relatively high cost and since the project is planned for the lO-year storm, it offers relatively smaller <br />benefits, In addition, the project does not offer multiple uses and there is relatively low potential for <br />additional funding sources. However, this project has several less expensive components that can be <br />constructed in phases. Based on the scores received by each component, it is suggested that they be <br />constructed in the following order: <br /> <br />1. North Division Detention Pond <br />2. HWY 14 Crossing <br />3. Phelps Street Crossing <br />4. BNRR Crossing <br />5, Channel Grading and Bridge Erosion Protection Upstream ofHWY 14 <br />6. Channel Realignment <br />7. Channel Improvements at Sidney Avenue Bridge and Seventh Avenue Bridge <br /> <br />In general, the implementation sequence suggested for the Pioneer Ditch is from downstream to <br />upstream for the major elements with some of the smaller elements to be constructed last. The North <br />Division Detention Pond provides a relatively large benefit downstream of the pond without any <br />additional improvements downstream. The existing crossings at HWY 14, Phelps Street, and the <br />UPRR are all severely undersized. New crossings will provide a significant benefit by eliminating <br />severe backwater conditions. It is recommended that they be replaced in order from downstream to <br />upstream. The bridge protection upstream of HWY 14, and the channel improvements at Sidney <br />A venue and Seventh A venue are minor improvements that can be made at anytime. These are minor <br />channel improvements in the vicinity of the bridges and provide relatively minor benefits. Finally, the <br />channel realignment is a fairly expensive improvement which provides a relatively small benefit and <br />can be constructed at anytime. <br /> <br />12 <br />