flows from the septic tank to the drainfield or to a distribution device drainfield series of trenches or a bed lined with gravel/ sand and buried one to three feet below the ground surface. Start studying Septic system. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A conventional septic tank system comprises a septic tank followed by a soil percolation area. The septic tank functions as a primary sedimentation tank, removing most of … Septic Tank Rural and suburban areas with soil has their sewage pumped into the septic tank. Grease and oil rise to the top, solids fall to the bottom (and are decomposed by aerobic bacteria) and waste water is throughout the yard from perforated pipes Learn septic with free interactive flashcards. Choose from 500 different sets of septic flashcards on Quizlet. septic tank tank, usually underground in which sewage is collected & allowed to decompose through bacterial activity before draining by means of a leaching field (anaerobic digester) If your septic system is in danger of being flooded or has been covered with flood waters, the best thing you can do is to use the system as little as possible until conditions dry out. Limit washing clothes, flushing toilets, and running sinks to restrict the amount of liquids added to your septic system.