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No. 1 —Detention Ponds <br /> Maintenance Defect Conditions When Maintenance Is Results Expected When <br /> Component Needed Maintenance Is Performed <br /> Emergency Tree Growth Tree growth on emergency spillways Trees should be removed. If root <br /> Overflow/ creates blockage problems and may system is small (base less than 4 <br /> Spillway and cause failure of the berm due to inches)the root system may be left in <br /> Berms over 4 uncontrolled overtopping. place.Otherwise the roots should be <br /> feet in height. Tree growth on berms over 4 feet in removed and the berm restored.A <br /> height may lead to piping through the licensed civil engineer should be <br /> consulted for proper berm/spillway <br /> berm which could lead to failure of <br /> the berm. restoration. <br /> Piping Discernable water flow through pond Piping eliminated. Erosion potential <br /> berm. Ongoing erosion with potential resolved. <br /> for erosion to continue. <br /> (Recommend a Goethechnical <br /> engineer be called in to inspect and <br /> evaluate condition and recommend <br /> repair of condition. <br /> Emergency Emergency Only one layer of rock exists above Rocks and pad depth are restored to <br /> Overflow! Overflow! native soil in area five square feet or design standards. <br /> Spillway Spillway larger,or any exposure of native soil <br /> at the top of out flow path of spillway. <br /> (Rip-rap on inside slopes need not be <br /> replaced.) <br /> Erosion See"Side Slopes of Pond" <br /> Volume V—Runoff Treatment BMPs—December 2014 <br /> 4-34 <br />