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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 /> B Ponding Basin inlet via Soil is exposed or signs of erosion are visible. Repair and control erosion sources <br /> Area surface flow <br /> B Ponding Basin inlet via Sediment, vegetation, or debris partially or fully Clear the blockage. Identify the source of <br /> Area concentrated flow blocking inlet structure. the blockage and take actions to prevent <br /> (e.g., curb cuts) future blockages. <br /> B Ponding Basin inlet splash Water splashes adjacent buildings. Reconfigure/repair blocks <br /> Area block failure <br /> B Ponding Basin inlet splash Water disrupts soil media. Reconfigure/repair blocks <br /> Area block failure <br /> B Ponding Inlet/outlet pipe Pipe is damaged. Repair/replace <br /> Area failure <br /> B Ponding Inlet/outlet pipe Pipe is clogged. Remove roots or debris <br /> Area failure <br /> B Ponding Outlet Sediment, vegetation, or debris partially or fully Clear the blockage. Identify the source of <br /> Area pipe/structure failure blocking inlet structure the blockage and take actions to prevent <br /> future blockages. <br /> B Ponding Trash rack failure Trash or debris present on trash rack. Clean and dispose trash <br /> Area <br /> B Ponding Trash rack failure Bar screen damaged or missing. Replace <br /> Area <br /> B Ponding Check dams and Sediment,vegetation,or debris partially or fully Clear the blockage. Identify the source of <br /> Area Weirs failures blocking check dam or weir. the blockage and take actions to prevent <br /> future blockages. <br /> B Ponding Check dams and Erosion and/or undercutting is present Repair and take preventative measures to <br /> Area Weirs failures prevent future erosion and/or undercutting <br /> B Ponding Flow Spreader Sediment blocks 35%or more of ports/notches Remove and dispose <br /> Area problems or sediment fills 35% or more of sediment trap. <br /> B Ponding Flow Spreader Grade board/baffle damaged or not level. Remove and reinstall to level position <br /> Area problems <br /> Appendices <br /> F-55 <br />