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.
Maintenance Here's a little discussed but logical fact of life regarding septic systems: All septic systems require maintenance to keep them working correctly and to ensure...
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...
Septic Tank Additives There are many companies promoting their septic tank additives, saying they can solve all of your septic woes. For over 15 years, these claims have...
  • Septic Tank Aerator An aerator or air pump, normally installed in a chamber atop or close to the septic tank, pumps...
  • Failure Septic System The most obvious septic system failures are easy to spot. Check for pooling water or muddy soil around...
  • Septic Cost There is not one number for the cost of a septic system. We've seen residential systems go in...
  • Septic Tank Treatment (1) NSF-listed treatment units are only certified, and can only handle, residential strength wastewater at their rated flows....
  • Septic Pumps The septic tank effluent is allowed to flow to the drainfield by gravity or is dosed by pump...