Residential Septic Drain Field Design

Building a septic drain field is time consuming but pays off in the long run.

Residential septic drain field design. Ledge considerations are very common near waterfront areas such as the lakefronts and seacoasts throughout new hampshire maine and. A septic system is the most common method of sewage treatment for homes and businesses that are not connected to an area wide sewage system. An improperly designed drain field will do nothing but cause huge problems with the entire system. The new regulations state that for any house up to and including 3 bedrooms the minimum size sewage system that can be installed is for 5 persons with one extra person added for each extra bedroom.

When you design your drain field there are a few things to keep in mind. In its basic form a septic system consists of a septic tank where solids settle and decompose and a drainfield where liquid discharged from the tank is treated by bacteria in the soil. An important soil characteristic the percolation rate measures how long it takes water to drop one inch in a saturated hole dug in soil. A conventional septic system is typically installed at a single family home or small business.

Field size dimensions depth layout suggestions. A septic drain field is a vital part of any septic system. Leach field or soakaway field size requirements for these septic system designs. Unfortunately drain fields also known as leach fields do not last that long.

Design guide for septic drainfields. Like your septic tank the size of the drain field will depend on the square footage of your home the size of your family and how much water you typically use. Septic tanks last from 15 to 30 years. The size necessary for your drain field will depend on a few.

The gravel stone drainfield is a design that has existed for decades. Code approved conventional septic drainfields or leach fields are described here design criteria for septic drainfields and septic absorption bed systems soakaway fields table of septic drainfield trench lengths determined by soil percolation rate and daily wastewater input flow materials to be used for drainfields gravel guidelines for use of seepage pits in septic systems. The drain field also called the leach field performs more than half the job in a conventional residential septic system. This leachfield footprint reduction allows people to build homes and create successful alternative septic systems on small lots that cannot support a traditional larger sized septic system.

1 inch in 3 minutes sandy soil. Trench line specs detailed specifications leach fields gravelless systems deep trench systems shallow trench systems cut and fill systems absorption bed systems. With this design effluent is piped from the septic tank to a shallow underground trench of stone or gravel. The length of the soakaway drainage field drains is determined by the number of bedrooms in the house and the porosity of the soil.

Norweco accommodates ledge considerations for up to 4 bedroom homes. Step 1 determine the size. 1 inch in 48 minutes clay soil.