Sewer Network

Sewer Network


the aggregate of underground pipelines and sewers receiving and draining waste waters away from population centers and industrial enterprises and toward the appropriate treatment facilities; the principal element of a sewerage system.

An urban sewer network consists of pipe networks draining city blocks, buildings and groups of buildings, and streets, sewage mains, and pressure lines. The lines of the sewer network running within individual buildings are connected to the network of that group or block of buildings through special drainage outlets. Pumping stations are built to pump the sewage water to treatment facilities. Manholes are provided for inspection and repairs. Industrial enterprises may have several sewer networks for removing effluents of different composition (for example, strong acid and strong base).

Depending on topography, ground conditions, composition of the effluents, and sequence of construction, networks may be perpendicular, transverse, parallel, zonal, or radial. Whenever possible, sewer networks are designed to use a gravity-fed system to transport household and industrial effluents. The hydraulic calculations necessary in designing a sewer network consist in determining the diameter of the pipes and their load and the rate of flow of the effluents. The network should be deep enough (depending on the depth of soil freeze) to protect the pipes against damage by surface transport. This comes to about 2 m for the middle zone of the USSR.

The choice of pipelaying material depends on the composition of the effluents and groundwaters and on the purpose of the pipeline. A gravity-fed sewer network is made from ceramic, asbestos-cement, concrete, and reinforced-concrete pipe; the large-diameter mains are made from reinforced-concrete pipe or prefabricated sections of reinforced concrete. Metal, asbestos cement, and reinforced-concrete pipes are used for pressure lines. Pipes can also be made from synthetic materials. Careful fitting of the joints in laying the pipe helps ensure water tightness and long life.


References in periodicals archive ?
We know how devastating flooding can be, so upgrading our vast sewer network is one of our top priorities in order to be prepared for the future.
Across the region, there have been 50,888 blockages so far this year throughout the huge 52,500 kilometre sewer network.
TWO North East businesses have benefited from multi-million pound contracts awarded to maintain the region's sewer network.
The scope consists of building a potable water network, an irrigation water network, a storm water network, a sewer network, irrigation and firefighting reservoirs, pumping stations and control rooms.
Predominantly made up of fat, grease and paper, the blockage in the sewer underneath Mill Lane in the city centre was part of the 80 tonnes of rubbish that Welsh Water has removed from Cardiff's sewer system in the past year In recent years, such items as a minimotorbike, a football goal net, a pair of trousers, and a chair leg have been recovered from Wales' ageing sewer network, which is made up of more than 30,000km of piping - enough to stretch to Australia and back if laid end-to-end.
Muscat: Years after a comprehensive sewer network was planned in Muscat, the government is still moving slowly to complete the much awaited project which is causing considerable pollution and proving to be a financial burden on residents.
TAMWORTH-based Enviro Strip (UK) Limited has been fined PS5,000 for making illegal discharges into the Severn Trent Water sewer network.
The firm has built 550km of the sewer network, and has plans to increase this to over 4,000km.
Water is rationed in the city for up to 72 hours each week, which has led to waste accumulating in the sewer network.
MOTORISTS in Warwick are being reminded to observe diversions in place in the town as Severn Trent continues work to improve the sewer network.
Yordanka Fandakova and Environment Minister Nona Karadzhova signed Wednesday in the town of Bankya three contracts for building a sewer network and collectors on the territory of the Sofia Municipality.
United Utilities is expanding the sewer network in Brunswick Parade, Crosby, and surrounding streets so it can cope better during heavy rainfall.