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Table V-A.20: Maintenance Standards - Compost Amended Vegetated Filter Strip (CAVFS) <br /> Maintenance Defect Conditions When Maintenance is Needed Results Expected When Maintenance is Performed <br /> Component <br /> Sediment accu- <br /> mulation on Sediment depth exceeds 2 inches. Remove sediment deposits. Relevel so slope is even and flows pass evenly through strip. <br /> grass <br /> Grass becomes excessively tall (greater than 10 <br /> Vegetation inches); nuisance weeds and other vegetation Mow grass and control nuisance vegetation so that flow is not impeded. Grass should be mowed to a height of 6 inches. <br /> start to take over. <br /> General Trash and debris Trash and debris have accumulated on the veget- Remove trash and debris from filter. <br /> ated filter strip. <br /> Erosion/scouring Areas have eroded or scoured due to flow chan- For ruts or bare areas less than 12 inches wide, repair the damaged area by filling with a 50/50 mixture of crushed gravel and compost. The grass will creep in over <br /> nelization or high flows. <br /> the rock in time. If bare areas are large, generally greater than 12 inches wide, the vegetated filter strip should be regraded and reseeded. For smaller bare areas, <br /> overseed when bare spots are evident. <br /> Flow spreader is uneven or clogged so that flows <br /> Flow spreader are not uniformly distributed over entire filter Level the spreader and clean so that flows are spread evenly over entire filterwidth <br /> width. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume V-Appendix A -Page 1018 <br />