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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Energy Dissipaters <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> External: <br /> M Rock Pad Missing or Moved Only one layer of rock exists above native soil in Rock pad replaced to design standards. <br /> Rock area 5 square feet or larger, or any exposure of <br /> native soil. <br /> M Rock Pad Erosion Soil erosion in or adjacent to rock pad. Rock pad replaced to design standards. <br /> M Dispersion Pipe Plugged with Accumulated sediment that exceeds 20 percent Pipe cleaned/flushed so that it matches <br /> Trench Sediment of the design depth. design. <br /> M Dispersion Not Discharging Visual evidence of water discharging at Trench redesigned or rebuilt to standards. <br /> Trench Water Properly concentrated points along trench (normal <br /> condition is a "sheet flow" of water along trench). <br /> Intent is to prevent erosion damage. <br /> M Dispersion Perforations Over one-half of perforations in pipe are plugged Perforated pipe cleaned or replaced. <br /> Trench Plugged with debris and sediment. <br /> M Dispersion Water Flows Out Maintenance person observes or receives Facility rebuilt or redesigned to standards. <br /> Trench Top of"Distributor" credible report of water flowing out during any <br /> Catch Basin. storm less than the design storm or its causing <br /> or appears likely to cause damage. <br /> M Dispersion Receiving Area Water in receiving area is causing or has No danger of landslides. <br /> Trench Over-Saturated potential of causing landslide problems. <br /> Internal: <br /> M Manhole/ Worn or Damaged Structure dissipating flow deteriorates to one- Structure replaced to design standards. <br /> Chamber Post, Baffles, Side half of original size or any concentrated worn <br /> of Chamber spot exceeding 1 square foot which would make <br /> structure unsound <br /> Appendices <br /> F-18 <br />