A storm sewer or surface drainage system is an external engineering network that collects and removes precipitation from the territory in the form of rain and melted snow. The stormwater drainage scheme includes such elements as storm water inlets, trays (gutters), rain collectors, inspection wells, drop wells, surface wastewater treatment facilities, structures for regulating surface wastewater, as well as outlets (storm drains).
Those atmospheric precipitation in the form of rain, hail or snow is purposefully fed into the underground utilities system through special channels. Getting into the system of storm water treatment facilities, the surface runoff goes through several stages from accumulation to cleaning and further discharge into the general sewage system or onto the relief.
Rainwater drainage is a network of canals designed to collect and transport rain and melt water. Installation of storm sewers is carried out with a slight slope (from 0.005 to 0.007 when using pipes with a cross section of 20 cm and 0.007–0.008 for pipes with a diameter of 15 cm) in the direction of the main collector.
When designing storm sewers, it is necessary to provide for the possibility of taking additional measures to ensure the prompt replacement of sections or repair of pipelines during operation, as well as the mandatory use of appropriate surface wastewater treatment facilities.
To calculate treatment facilities, it is enough to know: the area of all surfaces of the object from which the surface runoff is formed (area balance), as well as the characteristics of the climatic zone (geographical location) to predict peak loads on the drainage system. The choice of equipment for storm water drainage is determined by the technical parameters of the project for drainage from a residential or industrial area.
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