Do-It-Yourself Drain Pit - Tips for Building a Drain Pit

The easiest way to set up a central sewage on the site of similarity is to construct a drain hole for sewage yourself. Its arrangement can be divided into several stages.

Preparation Stage

At this stage, it is necessary to make calculations - what size should the drain pit equipped with its own hands be, should be determined the number of people whose accommodation is planned for the suburban area. The volume of the drain hole directly depends on the intensity of use of various plumbing fixtures.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit This will work the drain hole

In addition to the size selection, you must determine where exactly the drain hole with their own hands will be organized. The following rules should be followed:

  • Choose a place based on the location of the groundwater. Such places should be avoided so as not to pollute the water that enters the house from a well or well located on the site. It is possible to determine the location of groundwater with the help of observations — for example, above groundwater located close to the surface, swamp plants grow well. The water level in the neighboring wells can also show the depth of the aquifer. But accurate information can be obtained mainly through test drilling.
  • The distance from the water source to the drain pit should be at least 20-30 m. From the house, a tightly equipped pit should be located no closer than 5 m.
  • If the section is uneven and has pronounced heights and lowlands, the drain hole should be located in the lowest section for better flow of sewage into it. In this case, taking into account the precipitation, the pit needs to be done more than it is planned.


After choosing the location and volume of the drain hole, primary earthwork is required. Digging a pit under the drain hole for a small family is not so difficult.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit Digging out a pit under a hole

The construction of a pit depends on whether you plan to concrete the walls of the drain pit or not. Sealed sewers will require regular cleaning of the pit from waste with the help of the waste disposal service, as well as the drain pit without concrete bottom.

At the bottom of the prepared pit should be laid drainage - sand and gravel pad. It will be including the water filter, gradually leaving the ground. When concreting, a layer of sand and gravel can be made small - up to 10 cm. However, if such a pillow is planned as a natural filter, its thickness should not be less than 20 cm.

Construction of the drain hole

Concreting of the bottom is carried out using concrete mortar and reinforcement. On the prepared sand-gravel cushion, a layer of mortar is laid out in 5-10 cm, into which the reinforcement grate is embedded and another layer of concrete mortar is added. If you plan to use concrete rings for a sealed drain hole, you should deepen the walls while arranging the bottom so that the diameter of the bottom of the drain hole becomes larger than the diameter of the hole for the sewer hole.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit With a concrete bottom and without a bottom

After arranging the bottom of the pit, it is necessary to proceed to the formation of the walls. You can use:

  • concrete rings,
  • concrete mortar and reinforcement,
  • bricks.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit Drain pit from concrete rings

In the event that it is planned as walls put concrete rings, you should equip the drain hole as follows:

  1. After organizing the concrete floor (the area of ​​which should be slightly larger than the ring) a concrete ring with a diameter slightly larger than the diameter of the pit, put directly above the pit .
  2. Gradually removing the soil from under the ring, it is lowered to the surface level. Then put on top of the second ring and continue to clean the ground to the bottom.
  3. At the bottom, the joints of the ring and the concrete bottom must be treated with a concrete solution for sealing.
  4. If the bottom is just a sand and gravel pad, then the rings are simply lowered to the desired depth, and the joints between them are sealed with cement mortar.

Concreting the walls in the home will require not only the production of cement mortar from cement of a grade not less than M200, but also the construction of formwork from wooden planks. For greater strength, be sure to add reinforcement - metal rods with a thickness of at least 1 cm.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit Walls can be built from broken brick

The drain hole, the walls of which are brick masonry, is not necessarily equipped with a whole brick. Broken bricks, connected with cement mortar, will fit perfectly for the organization of sewage of a private house.

During the construction of the drain hole it is necessary to provide for the discharge of sewer pipes from the house.At the top of the tank, a hole with a diameter slightly larger than the drain pipe should be made. The void between the pipe and the walls of the hole is filled with sealant.

Do-It-Yourself Drain Pit - Tips for Building a Drain Pit Lid for the cesspool

A sealed lid with a hatch should be placed on the prepared drain hole.


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