Components
Perforated pipe at footing level, filter fabric and washed rock, cleanouts at corners, downspout leads kept separate from the perimeter line, and a discharge to storm or sump.
Maintenance
Flush the system on a regular cycle and keep leaves out of downspout leads — most perimeter failures start as sediment build-up.
Discharge rules
Municipalities differ on whether perimeter and roof water can share a line. A local contractor will know your city's requirements.
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