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<br />e <br /> <br />e <br /> <br />e <br /> <br />DAM EMBANKMENT <br /> <br />The dam would be a jurisdictional dam requ~r~ng preparation of <br />plans and specifications for approval by the State Engineer prior <br />to construction. The dam is expected to be an intermediate Class <br />I structure; there would probably be loss of life if the dam <br />failed. The reconnaissance designs described herein are based upon <br />the 1989 report described above. <br /> <br />The "Rules and Regulations for Dam Safety and Dam Construction" <br />prepared by the Colorado State Engineer, Division of Water <br />Resources state the following criteria should be met: <br /> <br />* a minimum of 5 feet of freeboard, <br />* an outlet pipe capable of draining the top 5 feet of storage <br />in 5 days, <br />* a crest width equal to the vertical height divided by 5 plus <br />10 feet, 25 feet maximum, <br />* a spillway capable of passing 100% of the PMP flood, <br />* upstream rip rap to protect the embankment, <br />* and complete soils investigation and analysis. <br /> <br />EMBANKMENT: The dam is expected to be a homogeneous earth <br />embankment constructed from impervious material in the reservoir <br />basin. The dam would have the following the dimensions: <br /> <br />* 110 feet high, <br />* crest length of about 1370 feet, <br />* crest width of 25 feet, <br />* 3.25H:l.OV upstream and 2.5H:l.OV downstream slopes <br />* 36 inch diameter outlet pipe, <br />* a spillway capable of passing 100% of the PMP. <br /> <br />A 20 foot deep, 75 foot wide core trench would be excavated most of <br />the length of the embankment and upstream of the centerline of the <br />embankment. <br /> <br />Figure 3 shows the cross section of the dam at the outlet pipe. <br />Figure 4 shows the front elevation view of the embankment looking <br />upstream from below the dam. <br /> <br />There is assumed to be adequate impermeable material for the <br />embankment available in the reservoir basin. If there is any <br />unsuitable material, e.g. excess rocks or humus, the material would <br />be wasted near the reservoir. Table 2 shows the estimated volume <br />of material required to construct the embankment; 30% is added to <br />this amount to allow for compaction. The material would be placed <br />in and compacted to at least 95% Standard Proctor. Adequate <br />testing will be required to monitor the compaction. <br /> <br />Rip rap is expected to be available near the reservoir. <br /> <br />East Lake Creek Dam <br /> <br />6 <br />