Septic System Trench

In the typical absorption field, each length of leach line or leaching chamber is set in its own individual trench. This results in an absorption field consisting of a series of parallel trenches that are about 18" to 30" deep. Because the aerobic bacteria that decompose waste thrive mostly in this upper area of the soil, this type of system provides the most thorough treatment of wastewater. It also helps protect ground water from possible contamination by affording the greatest possible separation distance between trench bottom and the water table.

Occasionally, however, space limitations may require different approaches. If soil and ground water conditions permit, seepage pits are an option. Another alternative is a stone bed where all the leach line is laid in a single, wide trench with stone aggregate.

All absorption areas, regardless of type, are subject to the same aging processes. In every case, a biomat forms on the trench walls. Initially this biomat aids wastewater treatment by straining out pathogenic bacteria.

As more bacteria and waste add to the biomat, the trench walls become more impervious to the passage of wastewater. Siltation and soil compaction can further slow the absorption rate. Eventually, wastewater might either back up into house drainage plumbing or seep out onto the ground surface.



Previous Article : Septic Leaching - - Next Article : Septic Chamber

Featured Articles
Providing Quality Service...Guaranteed In the Greater Austin Area of Travis, Hays, Williamson, Burnet, & Bastrop Counties , Hudson Bend, Rollingwood, Manor, Bear Creek, Driftwood, San Marcos, Coupland, Weir, Thrall, Misc Locations, Bell County.
Call (512) 338-1804 for fast, dependable service.
Alternative Septic System Regarding your Home Aerobic Treatment Unit: The components in your home plant should be serviced at least twice per year. The tanks must be...
Seller Says "Too Bad" Seller Says “Too Bad” After Homebuyers Find Rotting Septic Tank Under Plywood(From Pumper Magazine, October 23, 2018) A news organization in Cortland Manor, New...
Aerobic Treatment Unit First, please understand that the State has clearly stated it is the owner's responsibility to operate the aerobic treatment unit in compliance with all regulations...
  • Septic Maintenance We understand you want to live your life in your home, and the reason you need us is...
  • Septic Lines Leach lines are trenches that are filled with washed rock/gravel to flow level. Perforated pipe lays on top...
  • Seller Says "Too Bad" Seller Says “Too Bad” After Homebuyers Find Rotting Septic Tank Under Plywood(From Pumper Magazine, October 23, 2018) ...
  • Pump Septic Tank "Superior Onsite Service" Estimated septic tank pumping frequencies in years (for year-round residences). Tank Household size (number of...
  • Septic Tank Problems Snowden Onsite Services, Inc. maintains an inventory of common parts for all units. Our service personnel...