Drainfield

The septic tank effluent is allowed to flow to the drainfield by gravity or is dosed by pump or siphon. The effluent enters the soil and is treated as it percolates to the groundwater.

The soil acts as biological filter to remove nearly all harmful substances including disease-causing bacteria and viruses, toxic organics and other undesirable wastewater constituents remaining in the septic tank effluent.

The drainfield provides final treatment of the wastewater and releases the treated water into the groundwater recharge. The drainfield is typically built as a series of trenches or as one larger bed, and is usually one to three feet below ground level.

The drainfield must be constructed in permeable soils, have a level bottom, and be two or more feet above the groundwater table. While there are many types of drainfield systems such as aerobic, lagoon, sand filters or gravelless chamber technology, we will describe here a typical gravel and pipe system.

The excavated trench or bed is filled with six to twelve inches of gravel. The gravel exposes a soil infiltrative surface and provides storage for the wastewater.

A perforated pipe is laid over the gravel to distribute the partially treated liquid, called effluent, from the septic tank over the bottom of the drainfield. The gravel and pipe are covered with synthetic fabric to help keep soil particles out of the system and the area is backfilled with soil to cover the system.



Previous Article : Graywater System - - Next Article : Septic System Cost

Featured Articles
Providing Quality Service...Guaranteed In the Greater Austin Area of Travis, Hays, Williamson, Burnet, & Bastrop Counties , The Hills, Jollyville, McNeil, Driftwood, Kyle, Bear Creek, Jollyville, Bartlett, Thrall, Misc Locations, Bell County.
Call (512) 338-1804 for fast, dependable service.
Why Stay On A Septic System? Top 5 Reasons for Preserving Onsite as a Viable, Even Preferred, Sewage Management Option: Better protection of public health is possible ...
Pumping Frequencies The table below provides an estimate of pumping frequency in years, based on the size of the first tank in gallons, and the number of...
Aerobic Septic System? Why do so many customers end up dissatisfied with their septic systems?  We feel it starts with nobody asking or even considering the owner's opinion before...
  • Septic Above Ground Septic tanks can often sit on or above ground, for several reasons:Above-ground tanks may be appropriate in water-front...
  • Installing Water Treatment Foul taste, smell, or color of your household water may prompt you to investigate water treatment equipment. The...
  • Septic Types Prospective buyers should know there are many different types of septic inspections. Systems installed since 1989 require permits...
  • Septic Tank Failure Failing systems that result in water coming to the surface are a public health hazard and can cause...
  • Installing Septic System With increasing frequency, people are asking how to use NSF-listed home plants for office, restaurant, or other nonresidential...