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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions That <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For Should Exist <br /> A Pond Tree Growth Tree growth on berms over 4 feet in height Trees should be removed. If root system is <br /> Berms may lead to piping through the berm which small (base less than 4 inches)the root system <br /> Over 4 ft in could lead to failure of the berm may be left in place. Otherwise the roots <br /> height should be removed and the berm restored.A <br /> (Dikes) licensed civil engineer should be consulted for <br /> proper berm/spillway restoration. <br /> A Pond Piping Discernable water flow through pond berm. Piping eliminated. Erosion potential eliminated. <br /> Berms Ongoing erosion with potential for erosion to <br /> (Dikes) continue. (Recommend a Geotechnical <br /> engineer be called in to inspect and evaluate <br /> condition and recommend repair of condition. <br /> A Emergency Tree Growth Tree growth on emergency spillways creates Trees should be removed. If root system is <br /> Overflow/ blockage problems and may cause failure of small (base less than 4 inches)the root system <br /> Spillway the berm due to uncontrolled overtopping. may be left in place. Otherwise the roots <br /> should be removed and the berm restored.A <br /> licensed civil engineer should be consulted for <br /> proper berm/spillway restoration. <br /> A Emergency Rock Missing Only one layer of rock exists above native soil Rocks and pad depth are restored to design <br /> Overflow/ in area 5 square feet or larger, or any standards. <br /> Spillway exposure of native soil at the top of outflow <br /> path of spillway. (Riprap on inside slopes need <br /> not be replaced.) <br /> A Emergency Erosion Erosion damage over 2 inches deep where Slopes should be stabilized using appropriate <br /> Overflow/ cause of damage is still present or where there erosion control measure(s); e.g., rock <br /> Spillway is potential for continued erosion. reinforcement, planting of grass, compaction. <br /> Any erosion observed on a compacted berm If erosion is occurring on compacted berms a <br /> embankment. licensed civil engineer should be consulted to <br /> resolve source of erosion. <br /> If you are unsure whether a problem exists, please contact a professional engineer. <br /> Key: <br /> (M) Monthly from October through April. <br /> (A) Once in late summer(preferably September) <br /> (S) After any major storm (use 1 inch in 24 hours as a guideline). <br /> Appendices <br /> F-5 <br />