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• Dam Classification Criteria <br />The dam classification criteria follows the guidelines of the USDA Soil Conservation Service <br />Technical Release 60 regarding potential for loss of life and damage as a result of dam <br />failure. As of the Mid Term Review of 2006, three designed ponds have not been built. These <br />are pond 010, 011 and 103. This classification criteria is as follows: <br />Class A: No realistic threat of damage to property or life in case of dam failure <br />Class B: Dams located in predominately rural or agricultural areas where failure may <br />damage isolated homes, main highways or minor railroads or cause interruption of use or <br />service of relatively important public utilities. <br />Class C: -- Dams located where failure may cause loss of life, serious damage to homes, <br />industrial and commercial buildings, important public utilities, main highways, or railroads. <br />Special demonstrations are needed for ponds that have Class B or C dams. It is <br />demonstrated below that each of the ponds meets the Class A criteria. <br />Pond 010 - As seen on Map 2.05.3(3)-1 Surface Hydrology, the only buildings or structures <br />which require evaluation are the Enstrom buildings located approximately 700 feet southwest <br />of the pond dam. In case of a dam failure, water would have to drop from the base of dam <br />elevation of 5613' to the low point of the channel, which is 5599' elevation and then rise up to <br />5615' elevation on the other side of the channel and approximately 700 feet away from the <br />dam. The channel is large and more than enough to handle a dam failure of a pond that is <br />entirely full. This volume is approximately 15 acre feet less 2 acre feet of incision, which is a <br />volume of 13 acre feet, depending upon the flow in the emergency spillway. Once the water <br />goes downstream in the tributary channel, it enters Tuttle Draw a short distance downstream <br />and there are no structures that could be affected by a small volume in Tuttle Draw since it is <br />large enough to handle substantial peak flows, as shown on Map 2.05.3(3)-1. For these <br />reasons, Pond 010 is given a Class A designation. <br />Pond 011 - As seen on Map 2.05.3(3)-1 Surface Hydrology, Pond 011 is located on the <br />same tributary drainage to Tuttle Draw as that described for Pond 010. The only buildings or <br />structures which require evaluation are the Enstrom buildings located approximately 670 feet <br />northwest of the pond dam. In case of a dam failure, water would have to drop from the base <br />• of dam elevation of 5621' and travel 670' to the northwest but it cannot since the upper reach <br />(Revisetl July 2006) 2.05.3(3}21 <br />