Septic Tank Drainage Design

All water runs out of your house from one main drainage pipe into a septic tank.

Septic tank drainage design.

A conventional septic system is typically installed at a single family home or small business. 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. If placed in an area with good ground absorption a drain field can last up to 10 years.

A drainage field is a specifically designed arrangement of perforated pipework laid in trenches to allow the effluent to filter into the ground. 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. Septic tanks last from 15 to 30 years. With this design effluent is piped from the septic tank to a shallow underground trench of stone or gravel.

How far is the drain tank from the septic tank. Often incorrectly called soakaways a drainage field is much more than just a soakaway. An improperly designed drain field will do nothing but cause huge problems with the entire system. 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.

Septic tank drainage fields are an integral part of a septic system. Definition of septic tank. The size necessary for your drain field will depend on a few factors. Septic tank is a water tight receptacle which receives the discharge of a human waste from the toilets.

On 2020 04 09 by mod que typical drainfield layout is parallel trenches about 5 feet apart. 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. Step 1 determine the size. Building a septic drain field is time consuming but pays off in the long run.

A septic tank consists of one or more concrete or plastic tanks of between 4000 and 7500 litres 1 000 and 2 000 gallons. The gravel stone drainfield is a design that has existed for decades. 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. On 2020 04 20 by howard my septic system is 48 years old.

The name refers to the construction of the drainfield. A septic drain field is a vital part of any septic system. When you design your drain field there are a few things to keep in mind.