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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. This classification criteria is shown below. <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 011 - As seen on Map 2.05.3(3) -1 Surface Hydrology, Pond 011 is located on the <br />tributary drainage to Tuttle Draw. The only buildings or structures which require evaluation <br />are the Enstrom buildings located approximately 670 feet northwest of the pond dam. In <br />case of a dam failure, water would have to drop from the base of dam elevation of 5621' and <br />travel 670' to the northwest but it cannot since the upper reach of the tributary channel is in <br />between the dam and the structures. See Map 2.05.3(3) -14 for details. Water will flow in the <br />channel first and since the maximum flow is only 11.5 acre feet for a full dam break, it is not <br />enough to cause the water to exceed the channel and flow uphill to the Enstrom structures. <br />Once the water goes downstream in the tributary channel, it enters Tuttle Draw a short <br />distance downstream and there are no structures that could be affected by a small volume in <br />Tuttle Draw since it is large enough to handle substantial peak flows, as shown on Map <br />2.05.3(3) -1. For these reasons, Pond 011 is given a Class A designation. <br />Ponds 012 and 013 - As seen on Map 2.05.3(3) -1 Surface Hydrology, Ponds 012 and 013 <br />are located immediately outside the floodplain of Tuttle Draw. Any dam break of these ponds <br />would discharge water directly into Tuttle Draw. There is no chance the water could harm <br />anything or anyone at other locations. There are no structures that could be affected by a <br />small volume in Tuttle Draw since it is large enough to handle substantial peak flows, as <br />(Revised June 2010) 2.05.3(3) -16 <br />