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• <br /> <br />I <br />378-2 Pond <br />or constructed emergency spillway; or <br />(2) a combination of a principal <br />spillway and an emergency spillway. <br />Livestock Water Tanks and Erosion <br />Control Dams shall meet the require- <br />ments of the Slate Engineer of <br />Colorado. They are permitted only on <br />watercourses, the channels of which <br />are determined by the State Engineer <br />of Colorado to be normally dry. <br />Drainage area. The drainage area <br />above the pond must be protected <br />against erosion to the extent that <br />expected sedimentation will not <br />shorten the planned effective Tife of <br />the structure. The pond must have an <br />expected useful life of at least 25 <br />years. The drainage. area shall be <br />large enough so that surface runoff, <br />together with groundwater flow or <br />diverted surface water will maintain <br />an adequate supply of eater in the <br />pond. <br />The water quality shall be suitable <br />far its intended use. In the case of <br />fish ponds, the watershed shall not <br />yield colloidal materials or other <br />wastes that will be damaging to the <br />species of fish to be produced. <br />Reservoir area. The topography <br />and soils of the site shall permit <br />storage of water at a depth and volume <br />that insures a dependable supply, <br />considering beneficial use, sedimenta- <br />tion, season of use, and evaporation <br />and seepage losses. If surface runoff <br />is the primary source of water for a <br />pond, the soils shall be impervious <br />enough to prevent excessive seepage <br />losses or shall be of a type that <br />sealing is practicable. Watar from <br />agricultural fields on which insecti- <br />cides are used shall be diverted <br />around ponds for fish. <br />The surface area of a Livestock Water <br />Tank should be relatively sa,all so <br />SCS, Colorado, April 1980 <br />that evaporation and seepage losses <br />are minimal. <br />Except for fish-out and rearing <br />ponds, ponds for fish shall have a <br />minimum size of one-quarter surface <br />acre, and no more than one-fifth of <br />pond surface shall have eater depth <br />less than 2 feet when pond is full. <br />Depth along the shoreline of fish <br />ponds should slope abrvptly into <br />three (3) feet of water. In <br />addition, ponds where fish will be <br />overwintered: <br />1. Below 6,000 feet, should have a <br />minimum depth of 6 feet over one- <br />third of pond area. ' <br />2. Above 6,000 feet, should have a <br />minimum depth of 10 feet over one- <br />third of the pond area. Where live <br />stream or aereated spring water flows <br />continuously into pond, the minimum <br />depth required is 7 feet over one- <br />third of pond area. <br />Ponds where fish will not be over- <br />wintered (fish-out and rearing ponds) <br />such as fee-fishing ponds, guest <br />ranch ponds, and others, temperature <br />is the primary consideration. Water <br />temperature cannot exceed 75°F one <br />(1) foot below surface at any time <br />during the year for cold water fish. <br />These ponds may be smaller and shal- <br />lower than ponds where fish will be <br />expected to over winter. <br />Design criteria for embankment <br />ponds <br />General. Except for Livestock <br />Water Tanks and Erosion Control Dams, <br />special plans and specifications <br />shall be prepared for dams having an <br />effective height in excess of ten <br />(10) feet, or having a surface area <br />a[ high waterline in excess of twenty <br />(20) acres in accordance ui[h State <br />Statutes. These dams shall be <br />approved by the State Conservation <br />i <br />