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Pond (No.> <br />• <br />Definition <br />A water impoundment made by <br />constructing a dam or an <br />embankment or by excavating a pit <br />or dugout. In this standard, <br />ponds constructed by the first <br />method are referred to as <br />embankment ponds, and those <br />constructed by the second method <br />are referred to as excavated <br />ponds. Ponds constructed by both <br />the excavation and the embankment <br />methods are classified as <br />embankment ponds if the depth of <br />water impounded against the <br />embankment at spillway elevation <br />is 3 ft. or more. <br />Purpose <br />To provide water for livestock, <br />fish and wildlife, recreation, <br />fire control, crop and orchard <br />spraying, and other related uses, <br />and to maintain or improve water <br />quality. <br />Scope <br />This standard establishes the <br />minimum acceptable quality for the <br />design and construction of ponds <br />if: <br /> <br />1': Failure of the dam will not <br />result in loss of life; in damage <br />to homes, commercial or industrial <br />buildings, main highways, or <br />railroads; or in interruption of <br />the use of service of public <br />utilities. <br />• <br />Pond 378-1 <br />Technical Guide <br />SJL-4~19fl ~~ <br />Statewide <br />2. The product of the storage <br />times the effective height of the <br />dam is less than 3,000. Storage <br />is the volume, in acre-feet, in <br />the reservoir below the elevation <br />of the crest of the emergency <br />spillway. The effective height of <br />the dam is the difference in <br />elevation, in feat, between the <br />emergency spillway crest and the <br />lowest point in the cross section <br />taken along the centerline of the <br />dam. If there is no emergency <br />spillway, the top of the dam is <br />the upper limit. <br />3. The effective height of the <br />dam is 25 ft. or less, and the dam <br />is hazard class (a). <br />Condition where practice applies <br />General. Livestock Water Tanks <br />and Erosion Control Dams shall <br />meet the requirements of the <br />Colorado State Engineer. They are <br />permitted only on water courses, <br />the channels of which are <br />determined by the State Engineer <br />of Colorado to be normally dry. <br />Site conditions. Site conditions <br />shall be such that runoff from the <br />design storm can be safely passFd <br />through (1) a natural or <br />constructed emergency spillway, <br />(2) a combination of a principal <br />spillway and emergency spillway, <br />or (3) a principal spillway. <br />SCS, Colorado, January 1989 <br />