Septic Tank Design
Septic Tank Design | This is a complete septic tank design. You can see the top of the concrete septic tank and the level leach field on the other side of the vertical green vent pipe. House drain pipes that flow into septic tanks require maintenance to keep the septic tank working well. Copyright 2018 Tim Carter
"The size of the septic tank is determined by the number of bedrooms in almost all cases."
Septic Tank Design Checklist
- You need a professional design drawn by a pro
- Each house is different because of load, soil, and topography
- A leach field can be under a road
- Use gravity - avoid pumping septic tank water up hills
Septic Tank Design - You Need a Professional
Septic tank design is a science. Professional septic tank designers are trained to know exactly what type of system to put in for each location.
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What Size Septic Tank is Required?
The size of the septic tank is determined by the number of bedrooms in almost all cases. The septic designer has to know how many people might be living in the house. I have a four-bedroom home here in New Hampshire and my tank has a 1,000-gallon capacity.
What are the Basic Septic Tank Design Components?
A basic septic tank design will have:
- a precast concrete or fiberglass septic tank
- a distribution box
- a leach field piping system
What Does a Septic Tank Design Look Like?
The following photos show you an overall septic tank design. Look at the close-up photos to see the specific design details.
This is a large format septic tank design plan with all the information the contractor needs to install the entire system. Copyright 2018 Tim Carter
What Soils Are Best for Septic Systems?
A well-drained soil is best. The more sand that's in the soil the better. Dense clay soils are the worst.
What is a Raised Leach Field?
A raised leach field is one where the pipes and sandy filter soil are placed up above the normal grade height. These raised leach fields resemble Indian burial mounds.
Can a Leach Field be Placed Under a Driveway or Road?
Yes, a leach field can be placed under a driveway or road. These require a special pre-cast concrete panel system that protects the sand filter medium under the roadway or driveway. Watch the following video to see one.
Should I Have a Pump in My Septic Tank Design?
I'd avoid septic tank pumps at all costs. Pumps fail and are expensive. Request a septic tank design that uses gravity flow at all stages. If that's not possible, consider purchasing a different building lot.
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