Pipes for the removal of wastewater must be laid at a depth of at least 80 cm from the surface of the earth. Such a depth of laying a sewer pipe is necessary in order to prevent it freezing in winter. By mounting the pipeline, you need to observe the angle of slope in the direction of the drain. Which bias of the sewer pipe is the most optimal, you will have to calculate, but not less than 2 cm per linear meter pipes. At the bottom of the trench where the pipes are laid, the sand is poured — this will prevent plastic deformation during soil sagging. After laying, the pipe also needs to be filled with a layer of sand, then earth.
