Seepage pit means an excavation deeper than it is wide that receives septic tank effluent and from which the effluent seeps from a structural internal void into the surrounding soil through the bottom and openings in the side of the pit.
Infiltration means water other than wastewater that enters a sewer system (including sewer system and foundation drains) from the ground through such means as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow.
Filtration means a process for removing particulate matter from water by passage through porous media.
Outdoor or "outdoors" means in a place other than a building or covered vehicle.
Overflow means the intentional or unintentional diversion of flow from the collection and transport systems, including pumping facilities.