Before revision: Design Cross-section of weeping tile and leach field Many health departments require a percolation test ("perc" test) to establish the suitability of drain field soil to receive septic tank effluent.
After revision: A drain field being installed|alt=|329x329pxDesign Cross-section of weeping tile and leach field Many health departments require a percolation test ("perc" test) to establish the suitability of drain field soil to receive septic tank effluent.