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378-9 Pond <br /> <br />Visual resource design. The <br />visual design of ponds in areas of <br />high public visibility and those <br />associated with recreation shall be <br />carefully considered. The underlying <br />criterion for all visual design is <br />appropriateness. The shape and form <br />of ponds, excavated material and <br />plantings are to relate visually to <br />their surroundings and to their func- <br />tion. <br />Depth. The area of the pond at a <br />depth of 7 feet shall be at least 200 <br />square feet if physical conditions <br />permit. <br />Inlet protection. If surface <br />water enters the pond in a natural or <br />excavated channel, the side slope of <br />the pond shall be protected against <br />erosion. <br />• <br />The embankment may be shaped to blend <br />with the natural topography. The <br />edge of Che pond may be shaped so <br />that it is generally curvilinear <br />rather than rectangular. •Excavated <br />material can be shaped so that the <br />final form is smooth, flowing, and <br />fitting to the adjacent landscape <br />rather than angular geometric mounds. <br />If feasible, islands may be added for <br />visual interest and wildlife value. <br />.Design Criteria for Ezcavated <br />Ponds. <br />Bunoff. Provisions shall be made <br />for an inflow and/or outlet pipe and <br />an emergency spillway if necessary. <br />Runoff flow patterns shall be consid- <br />ered when locating the pit and plac- <br />ing the spoil (see Table 3). <br />Side slopes. Side slopes of ex- <br />cavated ponds shall be stable and <br />' shall not be steeper than 2 horizon- <br />, tai to 1 vertical. If livestock will <br />valet directly from the pond, a <br />watering ramp of ample width shall be <br />provided. The ramp shall extend to <br />the anticipated low water elevation <br />,~ at a slope no steeper than 4 horizon- <br />tal to 1 vertical. <br />Perimeter form. If the struc- <br />Lures are to be used for recreation <br />or are located in high public view, <br />the perimeter or edge must be curvi- <br />I linear in form. <br />L J <br />Ezcavated material. The material <br />excavated from the pond shall be <br />placed so that its weight will not <br />endanger the stability _af the pond <br />side slopes and where it viii not be <br />washed back into the pond by rainfall. <br />It shall be disposed of in one of the <br />following ways: _ <br />1. Uniformly spread to a height not <br />exceeding 3 ft. with the top graded to <br />a continuous slope away from the <br />pond. <br />2. Uniformly placed or shaped reason- <br />ably well with side slopes assuming a <br />natural angle of repose for the exca- <br />vated material, but not steeper than <br />3:1, behind a berm width equal to the <br />depth of the pond but not less than 12 <br />feet. <br />3. Shaped to a designed form that <br />blends visually with the landscape. <br />4. Used for low embankment and level- <br />ing, or <br />S. Hauled away. <br />Regardless of the disposal method <br />selected, no slopes shall be left <br />steeper than 3:1 and the waste area <br />smoothed and finally dressed so that <br />it is well drained. <br />Plana and specifications. <br />Plans and specifications for install- <br />ing ponds shall be in keeping with <br />[his standard and shall describe the <br />requirements for applying the practice <br />to achieve its intended purpose. <br />SCS, Colorado, April 1980 <br />