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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M General Inlet/Outlet Inlet/outlet areas clogged with sediment and/or Remove material so that there is no clogging <br /> debris. or blockage in the inlet and outlet area. <br /> M General Trash and Debris Trash and debris accumulated in the bioswale. Remove leaves,litter,and oily materials,and <br /> Accumulation re-seed or re-sod,and regrade,as needed. <br /> Clean curb cuts and level spreaders as <br /> needed. <br /> M General Erosion/Scouring Eroded or scoured swale bottom 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.If bare areas are large, <br /> generally greater than 12 inches wide,the <br /> swale should be re-graded and re-seeded. <br /> For smaller bare areas,overseed when bare <br /> spots are evident,or take plugs of grass from <br /> the upper slope and plant in the swale bottom <br /> at 8-inch intervals, <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-22 <br />