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No. 7—Energy Dissipaters <br /> Maintenance Defect Conditions When Maintenance is Results Expected When <br /> Components Needed Maintenance is Performed <br /> External: <br /> Rock Pad Missing or Only one layer of rock exists above Rock pad replaced to design <br /> Moved Rock native soil in area five square feet or standards. <br /> larger,or any exposure of native soil. <br /> Erosion Soil erosion in or adjacent to rock pad. Rock pad replaced to design <br /> standards. <br /> Dispersion Trench Pipe Accumulated sediment that exceeds Pipe cleaned/flushed so that it <br /> Plugged with 20%of the design depth. matches design. <br /> Sediment <br /> Not Visual evidence of water discharging at Trench redesigned or rebuilt to <br /> Discharging concentrated points along trench (normal standards. <br /> Water condition is a"sheet flow"of water along <br /> Properly trench). Intent is to prevent erosion <br /> damage. <br /> Perforations Over 1/2 of perforations in pipe are Perforated pipe cleaned or <br /> Plugged. plugged with debris and sediment. replaced. <br /> Water Flows Maintenance person observes or Facility rebuilt or redesigned to <br /> Out Top of receives credible report of water flowing standards. <br /> "Distributor" out during any storm less than the design <br /> Catch Basin. storm or its causing or appears likely to <br /> cause damage. <br /> Receiving Water in receiving area is causing or has No danger of landslides. <br /> Area Over- potential of causing landslide problems. <br /> Saturated <br /> Internal: <br /> Manhole/Chamber Worn or Structure dissipating flow deteriorates to Structure replaced to design <br /> Damaged 1/2 of original size or any concentrated standards. <br /> Post, worn spot exceeding one square foot <br /> Baffles,Side which would make structure unsound. <br /> of Chamber <br /> Other See"Catch Basins"(No. 5). See"Catch Basins"(No.5). <br /> Defects <br /> Volume V—Runoff Treatment BMPs—December 2014 <br /> 4-40 <br />