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<br />CHAPTER V - PLAN OF DEVELOPMENT <br /> <br />Physical Plan <br /> <br />The Colorado State Engineer's staff inspects Summit Reservoir <br />each year under the safety of D~ms Program. The most recent in- <br />spection was in June, 1983 whicn identified deficiencies in the <br />structure that must be correcteo. or the water level in the reser- <br />voir will be restricted in future years. The Plan of Development <br />concerns the items listed below. which were identified by the State <br />Engineer. <br /> <br />0 Establish crest contour to confirm available freeboard <br />0 Identify active seepage areas <br />0 Provide drains, filters, or other corrective action <br />0 Develop a regular program for inspection and monitoring of <br /> the dam <br /> <br />o Backfill below west ,outlet <br /> <br />Summit Reservoir is formed by a dam and dike along the west <br />side of the reservoir and a short dike on the south side of the <br />reservoir. The west dam and dike is about 7200 feet long and 45 <br />feet high at the maximum. Much of the dam and dike is less than <br />20 feet high (see Drawing V-A). The south dike is about 1600 feet <br />long and is less than 10 feet high. In general most of the seep- <br />age areas are in the lower sections which indicates. that greater <br />care was observed in constructing the higher sections. <br /> <br />The dam and dike are' homogeneous embankments with material <br />coming from the reservoir basin. and immediately below the toe'. <br />Characteristics of the material are described later. Homogeneous <br />dams generally show seeps on the downstream side about orie third <br />the height of ,the reservoir level and this is true at Summit <br />Reservoir. The borrow areas below the toe were not recontoured <br />after construction so these areaS now act as ponds to collect <br />water seeping through the embankment. The ponds and excessive <br />brush along most of the dam and dike make it difficult to assess <br />t~e seriousness of the see~age. <br /> <br />About 2300 feet of the west dike and the entire length of the <br />south dike needs to be recontoured below the toe. This inv.olves <br />grading the areas so that water drains away from the toe instead <br />of ponding, Clearing the brush that has grown around the ponds, <br />making collection drains at three places on the south dike and one <br />on the west dike, and installing flumes at these four locations so <br />that seepage can be monitored. <br /> <br />The flumes and recontouring will allow monitoring of the dike <br />to determine if structural work will be required; such as toe <br />drains, filters, etc. The area that needs structural modification <br />immediately is the middle part of the south dike. <br /> <br />-18- <br />