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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Filter Strips <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M General Sediment Sediment depth exceeds 2 inches. Remove sediment deposits,re-level so slope <br /> Accumulation on is even and flows pass evenly through strip, <br /> Grass <br /> E M General Vegetation When the grass becomes excessively tall Mow grass,control nuisance vegetation such <br /> (greater than 10 inches);when nuisance weeds that flow is not impeded.Grass should be <br /> and other vegetation starts to take over. mowed to a height between 3-4 inches. <br /> M General Trash and Debris Trash and debris accumulated on the filter strip. Remove trash and Debris from filter. <br /> Accumulation <br /> M General Erosion/Scouring Eroded or scoured areas due to flow For ruts or bare areas less than 12 inches <br /> channelization,or higher flows, wide,repair the damaged area by filling with <br /> crushed gravel.The grass will creep in over <br /> the rock in time.If bare areas are large, <br /> generally greater than 12 inches wide,the <br /> filter strip should be re-graded and re- <br /> seeded,For smaller bare areas,overseed <br /> when bare spots are evident. <br /> M General Flow spreader Flow spreader uneven or clogged so that flows Level the spreader and clean so that flows. <br /> are not uniformly distributed through entire filter are spread evenly over entire filter width <br /> I I width. <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 /> (5) After any major storm(use 1 inch in 24 hours as a guideline). <br /> Appendices <br /> F-24 <br />