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378-9 Pond <br />• excavated material, and plantings <br />are to relate visually to their <br />surroundings and to their <br />function. <br />The embankment may be shaped to <br />blend with the natural topography <br />The edges of the pond may be <br />shaped so that it is generally <br />curvilinear rather than <br />rectangular. Excavated material <br />can be shaped so that the final <br />form is smooth, flowing, and <br />fitting to the adjacent landscape <br />rather than angular geometric <br />mounds. If feasible, islands may <br />be added for visual interest and <br />to attract wildlife. <br />Design criteria for excavated <br />ponds <br />Runoff. Provisions shall be made <br />for a pipe and emergency spillway <br />if necessary. Runoff flow <br />patterns shall be considered when <br />locating the pit and placing the <br />spoil (see table 4). <br />Side slopes of excavated ponds <br />shall ba stable and shall not be <br />steeper than three horizontal to <br />one vertical. If livestock will <br />water directly from the pond, a <br />watering ramp of ample width shall <br />be provided. The ramp shall <br />extend to the anticipated low <br />water elevation at a slope no <br />steeper than four horizontal to <br />one vertical. <br />Inlet protection. If surface <br />water enters the pond in a natural <br />or excavated channel, tine side <br />slope entering the pond shall be <br />protected against erosion. <br />Excavated material. The material <br />excavated from the pond shall be <br />placed so that its weight will not <br />endanger the stability of the pond <br />side slopes and so that it will <br />not be washed back into the pond <br />by rainfall. It shall be disposed <br />of in one of the following ways: <br />1. Uniformly spread to a height <br />that does not exceed 3 ft. with <br />the top graded to a continuous <br />slope away from the pond. <br />2. Uniformly placed or shaped <br />reasonable well with sine siopes <br />assuming a natural angle of <br />repose. The excavated material <br />will be placed at a distance eeual <br />to the depth of the pond but not <br />less than 12 ft. from the edge of <br />the pond. <br />3. Shaped to a designed form that <br />blends visually with the <br />landscape. <br />4. Used for low embankment, land <br />smoothing, or land levelino. <br />~. Hauled away. <br />Regardless of disDOSaI method <br />selected, no slope shall pe left <br />steeper than 3:1 and the waste <br />area smoothed and finally dressed <br />so that it is well drained. <br />Plans and Specifications <br />Perimeter form. If the structures <br />are to be used for recreation or <br />are highly visible to the public, <br />the perimeter or edge should be <br />curvilinear. <br />Depth. The area of the pond at a <br />• depth of 7 feet shall be at least <br />200 square feet when conditions <br />permit. <br />Plans and specifications for <br />installing ponds shelf be in <br />keeping with this standard and <br />shall describe the requirement_ <br />for applying the practice to <br />achieve its intended purpose. <br />SCS, Colorado, January 1999 <br />