How to Design a Septic Leach Field
- 1). Connect a distribution box to your septic tank. Connect a four-inch solid pipe to each end of the distribution box. The pipe leading from the distribution box will be connected to a series of pipes that will carry septic liquid to the leach field after it's built.
- 2). Dig distribution trenches. Three trenches are recommended. Each trench should be at least one foot deep and lead from the distribution box to the leach field. Line the bottom of the trenches with gravel to ensure pipes stay in place. Trenches should be at least 20 feet long and lead to a flat surface away from obstructions such as sheds, driveways and trees.
- 3). Install distribution plumbing. Attach a U-connector with room for three PVC pipes to the pipe leading from the distribution box. Connect each pipe and lay them in the bed of gravel. Make sure each pipe is taped and secure.
- 4). Bury the pipes with a second layer of gravel and topsoil. Before covering the pipes with topsoil, cover them with two to three inches of gravel. Gently tamp the topsoil and cover it with straw or natural grass seed.
