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- 1.2- <br />This criteria was applied to equations and ci~arts presented by <br />• Hoek and Bray (ROCJc Slope Engineering, E. Hoek and J.W. Bray. The <br />Institution of Mining and Metallurgy, 1977). The darts contained <br />within this text were developed by computer application. We have <br />assumed a totally saturated erbankment in our chart selection <br />(Circular Failure Chart 5; Page 238). Under the above criteria and <br />slope oonditions, a minimum factor of safety of 2 was obtained. This <br />analysis assumes low strength properties and the most severe loading <br />conditions on the anban]anent. It should be noted that the minimum <br />factor of safety indicated above represents the lowest value obtained <br />for the larger eanbarilmients '(A and D). Factors of safety for the <br />remaining embankments are consistently higher. <br />SIAPE P%7PECTION <br />• The upstream embankment slopes mast be protected against erosion <br />caused by wave action. Small waves are created in reservoirs of this <br />size by wind and surface disturbances. These waves could gradually <br />erode the upstream face of the embanlanent. If the erosion is allowed <br />to continue, it could threaten t.':e integrity of the embankment. <br />However, with a regular maintenance program, erosion can be adequately <br />controlled. <br />The eanbanlanent faces should be protected with a vegetative cover <br />to reduce erosion. Periodic maintenance of the embankment faces may <br />be required. An enbanlanent maintenance program is described by <br />Leonard Rice Consulting Water Engineers in Exhibit 29 of the Kerr Coal <br />permit application. <br /> <br />Revised 11-80 <br />