Septic Tank Drainage Design

With this design effluent is piped from the septic tank to a shallow underground trench of stone or gravel.

Septic tank drainage design.

How far is the drain tank from the septic tank. Septic tanks last from 15 to 30 years. The gravel stone drainfield is a design that has existed for decades. A septic drain field is a vital part of any septic system.

One end is connected to an inlet wastewater pipe and the other to a septic drain field generally these pipe connections are made with a t pipe allowing liquid to enter and exit without disturbing any crust on the surface. The name refers to the construction of the drainfield. Septic tank is a water tight receptacle which receives the discharge of a human waste from the toilets. Unfortunately drain fields also known as leach fields do not last that long.

On 2020 04 20 by howard my septic system is 48 years old. 1st test ascertain whether or not your soakaway drainage field site is in an area designated by the environment agency as a groundwater source protection zone if it is then it means that the groundwater underneath your soakaway is used for drinking water and you will not be allowed to pollute it with sewage effluent from a septic tank soakaway. Definition of septic tank. The size necessary for your drain field will depend on a few factors.

Septic tank drainage fields are an integral part of a septic system. It is an underground storage chamber made of concrete fibreglass or plastic and is intends to control manage and most importantly treat waste material. On 2020 04 09 by mod que typical drainfield layout is parallel trenches about 5 feet apart. Its job is to hold the wastewater long enough to allow solids to settle down to the bottom forming sludge while the oil and grease floats to the top as scum.

An improperly designed drain field will do nothing but cause huge problems with the entire system. A septic tank consists of one or more concrete or plastic tanks of between 4000 and 7500 litres 1 000 and 2 000 gallons. All water runs out of your house from one main drainage pipe into a septic tank. Often incorrectly called soakaways a drainage field is much more than just a soakaway.

The soil should. When you design your drain field there are a few things to keep in mind. The home s sewer line drain pipe needs to slope 1 4 inch per foot downhill to the inlet side of the septic tank and the outlet pipe needs to flow downhill at least 1 8 inch per foot downhill to the leach field where the septic tank effluent enters a manifold or distribution d box. The septic tank is a buried water tight container usually made of concrete fiberglass or polyethylene.

In the article index you ll find articles on how to find the septic tank distribution box and drainfield. A drainage field is a specifically designed arrangement of perforated pipework laid in trenches to allow the effluent to filter into the ground. Building a septic drain field is time consuming but pays off in the long run.