9424 18TH AVE W 2018-01-02 MF Import

the catchbasin. Replacement of 4-6" riprap to protect the lid and prevent erosion should occur as necessary. Underdrain Pipes Clogged pipes prevent the underdrains and overflow inlets from draining runoff, resulting in prolonged saturation of the soils within the rain gardens, death of plants, unsightly landscaping, localized flouding, and failure of the drainage/treatment syster�i. Underdrain pipe discharges should be inspected on a seasonal basis (four times per year) to ensure that the pipes have not become clogged. Pipes may be flushed by introducing water from a garden hose into the yard drains at each rain garden. If this fails to ciear the blockage, a professional plumbing service may be called to remove the blockage. Catch Basins On-site catchbasins �;ollecting water from the streets and c�riveways should be cleaned to remove all material collected in tl�e sump. This should occur on an annual basis to ensure proper interce�ption of sediirient. Driveway Drsins Driveway drains colle�ct runoff and direct. it to the raii � gardens for treatment. Flooding of the garage may result if these become iouled with leaves, dirt, etc. Accumulation of material in the drain c:ould migrate into the conveyance pipe and create clogs that prevent flow and wouid be difficult to clean. Regular cleaning and flushing is iequired to maintain a functioning system. The Homeowner should inspect the Driveway Drain on a seasonal basis (four times per year). Removal of the grate, vacuuming/scooping and flushiny should be performed whenever an accum�lation of material is observed. HEARTIiSTONE LAME 18 DRAINAGE REPORT P.PRIL 2 i ;ti