Rain sewer is a set of devices that collect, filter and further discharge atmospheric moisture. It enters the filtration fields, reservoirs and special reservoirs. The task of this system is the elimination of excess moisture, which creates discomfort and destroy structures, reducing their life. This also applies to plants that are prevented by excess moisture in the area.
Description
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 gutters transport fluid to a sand trap, which is a filter device that sends water to a reservoir or reservoir. Manholes are essential for monitoring the entire system. To prevent the network from becoming contaminated with plant fibers, debris and soil, it needs sand traps and filters. All of these elements should be interconnected into a single system that works on 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 the surface channels.
Gathering information before installation
Before you install rainwater drainage, you need to collect certain information that will eliminate errors. This should include data on the average rainfall recorded in a particular area. The master must find out how often it rains, and also ask if the snow cover is powerful. For a point type of sewerage, it is necessary to know the drainage area, which is the roof area. You should not take the full size, you only need the value of the projection of the plane. If we are talking about a linear system, then the drainage area is the sum of the areas of the processed objects. It is important to analyze the soil, as the design uses the physical and mechanical characteristics of the soil on the site. It is important to consider whether there are communication systems laid underground in the territory.
Depth Guidelines
If you will be equipped with rainwater drainage, it is important to familiarize yourself with information about the depth of the laying of channels. It is necessary to lay the channels and trays from the pipes, deepening 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 true with the diameter of open trays and pipelines 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
Rain storm sewage should be located above the drainage, if such a system is available on the territory of the work. This feature should be considered when designing.
What else you need to know about the depth of the system elements
For the reason that 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 is carried out on its own, it is not recommended to install it too deeply. Manholes and collectors must not be below the seasonal freezing level. They can be placed higher, but you will have to use a heat-insulating material, a layer of crushed stone and geotextiles. If the deepening is not too noticeable, the complexity of the work will decrease. It should not be forgotten that the channels that lead to the collection and cleaning of water should be at an angle. This indicates the need to equip the input into the collector well below the level of the pipe or tray, one of which leaves the storm water inlet.
Storm installation technology
Rainwater drainage is laid out in the same way as a conventional outdoor sewage system. But if the house is not equipped with a drainage system, then you need to start with its arrangement. In the ceilings of the house should make holes for storm water inlets. After mounting the devices and fixing them on bitumen mastic, the junction must be sealed. At the next stage, sewage pipes are installed, all elements are attached to the structures of the house with the help of clamps. Then you can proceed to work with trays if you decide to use a linear type of system. When installing the point diagram, you should prepare the branch pipes.
Installation of the underground part
The arrangement of the rainwater drainage network provides for the preparation of a trench at the next stage, which is formed according to the planned plan taking into account the slope. If the pipeline is to be insulated, then around it a shell of geotextiles and gravel should be formed. An alternative is the use of sand cushions. In the next step, 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. A pit should be formed to mount the collector tank. As a collector, you can use a plastic container. But if you wish, you can complete the sewage well of the rainwater drainage system. These works involve pouring concrete into the equipped formwork.
Methodology
Pipes should be laid in ditches that were tamped and equipped with sand cushions. To connect them into one system, fittings must be used. If rainwater pipes will have a total length of more than 10 meters, then the presence of inspection wells should be provided. At the junctions of the water-receiving collectors and the pipeline, sand traps must be installed. After connecting all the elements in a single circuit, it is necessary to seal the seams. Before filling the trench, tests are carried out by pouring water into the water intake.
If no weak spots were found, then you can fill the system with soil. Gutters and pallets are equipped with gratings.
Specialist advice
It is forbidden to enter the collector city well into the general sewer network, since it drains from oil products and chemicals. If you are the owner of a country house, then you can connect the stormwater to your own sewage system, as there will be no hazardous components in the discharge water that might require fine cleaning. Drain pipes are most often made of PVC, and their diameter should be equal to 110 millimeters. The elements are interconnected by a double coupling. The slope of the sewer towards the spillway should be approximately 2 centimeters per meter.
Conclusion
Stormwater must not be combined with a drainage system. If this requirement is neglected, then gradually water will saturate underground clay soils, which will begin to swell and destroy the blind area, as well as structures and foundations. For this reason, one should not discharge stormwater into the sewers of the pool and bath.