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#22— Maintenance Checklist for Conveyance Systems (Pipes and Ditches): <br /> Drainage Defect or Condition When Maintenance Is Results Expected When Maintenance Maintenance <br /> System Problem Needed Is Performed Frequency Completed <br /> Feature <br /> Pipes Sediment& Accumulated sediment that exceeds 20 Pipe cleaned of all sediment and debris. <br /> Debris percent of the diameter of the pipe. <br /> Pipes Vegetation Vegetation that reduces free movement Vegetation does not impeded free <br /> of water though pipes. movement of water through pipes. <br /> Prohibit use of sand and sealant <br /> application and protect from <br /> construction runoff. <br /> Pipes Damaged Protective coating is damaged:rust is Pipe repaired or replaced. <br /> (Rusted, Bent causing more than 50 percent <br /> or Crushed) deterioration to any part of pipe. <br /> Pipes Damaged Any dent that significantly impedes flow Pipe repaired or replaced. <br /> (Rusted, Bent (i.e. decreases the cross section area of <br /> or Crushed) pipe by more than 20 percent). <br /> Pipes Damaged Pipe has major cracks or tears allowing Pipe repaired or replaced. <br /> (Rusted, Bent groundwater leakage. <br /> or Crushed) <br /> Open Trash&Debris Dumping of yard wastes such as grass No trash or debris present.Trash and <br /> Ditches clippings and branches. Unsightly debris removed and disposed of as <br /> accumulation of non-degradable prescribed by the County. <br /> materials such as glass, plastic, metal, <br /> foam,and coated paper. <br /> Open Sediment Accumulated sediment that exceeds 20 Ditch cleaned of all sediment and debris <br /> Ditches Buildup percent of the design depth. so that it matches design. <br /> Open Vegetation Vegetation(e.g.weedy shrubs or Water flows freely though ditches. <br /> Ditches saplings)that reduces free movements Grassy vegetation should be left alone. <br /> of water through ditches. <br /> Open Erosion Erosion damage over 2 inches deep No erosion damage present.Slopes <br /> Ditches Damage to where cause of damage is still present stabilized using appropriate erosion <br /> Slopes or where there is potential for continued control measure(s); e.g., rock <br /> erosion. reinforcement, planting of grass, <br /> compaction. <br /> Open Erosion Any erosion observed on a compacted If erosion is occurring on compacted <br /> Ditches Damage to berm embankment berms a professional engineer should <br /> Slopes be consulted to resolve source of <br /> erosion. <br /> December 2016 Volume V—Stormwater BMPs C-44 <br />