Rain sewer: description, device features and recommendations

Rain sewer: description, device features and recommendations
Rain sewer: description, device features and recommendations

Rain sewer is a set of devices that collect, filter and further remove atmospheric moisture. It enters the filtration fields, reservoirs and special reservoirs. The task of this system is to eliminate excess moisture, which creates discomfort and destroys structures, reducing their service life. This also applies to plants that are interfered with by excess moisture in the area.


rainwater drainage

Rain sewer is a linear network that provides for the presence of standard elements such as storm water inlets, gutters and manholes. If we are talking about storm water inlets, then they look like pallets, funnels, as well as linear trays that collect excess water. Trays, pipes and troughs transport fluid to a sand trap, which is a filtration device that sends water to a pond or collector. Manholes are necessary to control the entiresystems. In order for the network not to be contaminated with plant fibers, debris and soil, it needs sand traps and filters. All of the listed elements must be interconnected into a single system that operates on a point or linear technology. If the channels are located in the ground, pipes should be used for their construction. Gutters and trays made of concrete, asbestos or plastic are mounted in surface channels.

Collecting information before installation work

rainwater well

Before you equip rainwater drainage, you need to collect certain information that will eliminate errors. This should include data on the average amount of precipitation, which is recorded in a particular area. The master should find out how often it rains, and also ask if the snow cover is powerful. For a point type of sewage, it is necessary to know the area of ​​\u200b\u200bdrain, which is the area of ​​\u200b\u200bthe roof. You should not take the full value, you only need the value of the projection of the plane. If we are talking about a linear system, then the runoff area is the sum of the areas of processed objects. It is important to analyze the soil, since the design uses the physical and mechanical characteristics of the soil on the site. It is important to consider whether there are underground communication systems in the territory.

Recommendations for laying channels depending on the depth

rainwater drainage

If you will be equipping a rain sewer, it is important to familiarize yourself withinformation about the channeling depth. It is necessary to lay channels and trays from pipes, going deeper, taking into account the recommendations that are given for a particular region. In the middle lane, the rainwater drainage system is laid to a depth of 0.3 meters. This figure is correct when the diameter of open trays and pipelines is not more than 50 centimeters. If we are talking about pipes and trays with larger sizes, then you need to go deeper by 0.7 meters.

For reference

Rainwater drainage should be located above the drainage, if such a system is available in the work area. This feature should be taken into account when designing.

What else you need to know about the depth of the system elements

Because excavation is quite expensive, people who use professional installation services do not want to go too deep into the ground. Even if the storm sewer device will be carried out on its own, it is not recommended to install it too deeply. Inspection wells and collectors should not be located below the seasonal freezing level of the soil. They can be placed higher, but you will have to use heat-insulating material, a layer of crushed stone and geotextiles. If the deepening is not too noticeable, then the complexity of the work will decrease. At the same time, we should not forget that the channels that lead water to collection and purification should be located at an angle. This indicates the need to equip the entrance to the collector well below the level of the pipe or tray, one of which departs from the storm water inlet.

networksrain sewer

Stormwater installation technology

Rainwater sewerage is laid on the same principle as a conventional outdoor sewerage system. But if the house is not equipped with a drainage system, then it is necessary to start with its arrangement. In the ceilings of the house, holes should be made for storm water inlets. After mounting the devices and fixing them on the bituminous mastic, the junction points must be sealed. At the next stage, sewers are installed, all elements are attached to the structures of the house using clamps. Then you can proceed to work with trays if you decide to use a linear type of system. When installing a spot circuit, prepare branch pipes.

rainwater drainage

Installation of the underground part

Arrangement of the rainwater sewer network provides for the next step in the preparation of a trench, which is formed according to the planned plan, taking into account the slope. If the pipeline is to be insulated, then a shell of geotextile and crushed stone should be formed around it. An alternative option is to use a sand cushion. At the next stage, the bottom of the trench is rammed, and the stones are removed. The spaces formed after them must be covered with soil. The bottom is filled with a sand cushion, the thickness of which is 20 centimeters. To install the collector tank, a pit should be formed. You can use a plastic container as a collector. But if you wish, you can make a storm sewer collector well. These works involve pouring concrete into the equipped formwork.

Work methodology

Ditches that have been rammed and filled with sand pads should be laid with pipes. To connect them into one system, you need to use fittings. If the rainwater pipes have a total length of more than 10 meters, then manholes should be provided. Sand traps must be installed at the junctions of the water-receiving collectors and the pipeline. After connecting all the elements into a single chain, it is necessary to seal the seams. Before backfilling the trench, tests are carried out by pouring water into the water intake.

If no weaknesses were found, then you can fill the system with soil. Gutters and trays are equipped with gratings.

rainwater pipes

Expert advice

The collector city well is forbidden to be introduced into the general sewerage network, as it is used for effluents with oil products and chemicals. If you are the owner of a country house, you can connect the storm drain to your own sewer, as there will be no dangerous components in the discharged water that might require fine cleaning. Drainage pipes are most often made of PVC, and their diameter should be equal to 110 millimeters. The elements are connected to each other by a double coupling. The slope of the sewer towards the spillway should be approximately 2 centimeters per meter.


Storm water should not be combined with the drainage system. If this requirement is neglected, then gradually the water will saturate the underground clay soils, which will begin toswell and destroy the blind area, as well as structures and foundations. For this reason, you should not dump storm drains into the sewers of the pool and bath.

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