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(civil engineering)
The fluid discharge from medical, domestic, and industrial sanitary appliances. Also known as sewerage.


Water-carried wastes, in either solution or suspension, that flow away from a community. Also known as wastewater flows, sewage is the used water supply of the community. It is more than 99.9% pure water and is characterized by its volume or rate of flow, its physical condition, its chemical constituents, and the bacteriological organisms that it contains. Depending on their origin, wastewaters can be classed as sanitary, commercial, industrial, or surface runoff.

The spent water from residences and institutions, carrying body wastes, ablution water, food preparation wastes, laundry wastes, and other waste products of normal living, are classed as domestic or sanitary sewage. Liquid-carried wastes from stores and service establishments serving the immediate community, termed commercial wastes, are included in the sanitary or domestic sewage category if their characteristics are similar to household flows. Wastes that result from an industrial process or the production or manufacture of goods are classed as industrial wastes. Their flows and strengths are usually more varied, intense, and concentrated than those of sanitary sewage. Surface runoff, also known as storm flow or overland flow, is that portion of precipitation that runs rapidly over the ground surface to a defined channel. Precipitation absorbs gases and particulates from the atmosphere, dissolves and leaches materials from vegetation and soil, suspends matter from the land, washes spills and debris from urban streets and highways, and carries all these pollutants as wastes in its flow to a collection point. Discharges are classified as point-source when they emanate from a pipe outfall, or non-point-source when they are diffused and come from agriculture or unchanneled urban land drainage runoff.

Wastewaters from all of these sources may carry pathogenic organisms that can transmit disease to humans and other animals; contain organic matter that can cause odor and nuisance problems; hold nutrients that may cause eutrophication of receiving water bodies; and may contain hazardous or toxic materials. Proper collection and safe, nuisance-free disposal of the liquid wastes of a community are legally recognized as a necessity in an urbanized, industrialized society. See Sewage treatment


Any liquid-borne waste, containing animal or vegetable matter in suspension or solution; may include liquids containing chemicals in solution; ground, surface, or storm water may become mixed with it as it is admitted into or passes through the sewers.
References in periodicals archive ?
The second project or phase is implementing the new sewage system in Discovery Gardens and JLT which will result in the redirection of the sewage water to the Jebel Ali station to avoid future incidents and inconvenience for residents of the area," he said.
Annual Demand for Sewage & Wastewater and Water Utilities
Work is still in progress to build sewage treatment plants in East Hidd on the Dry Dock Highway and the needed sub networks in different areas.
Possibilities include pumping more sewage onto hundreds of acres of fields and poplar plantations that the agency owns north of Eugene, or offsetting the wastewater's harmful warming effects on the river by planting shade trees along the Willamette.
In many countries across the world the sewage treatment penetration rate has reached high and renovation of old sewage system is required.
Because sewage maintenance is an important global issue, the Japan Sewage Works Association intends to accelerate technological development by enabling interaction among sewage professionals worldwide while positively promoting globalization of the exhibition.
The municipality recently warned the companies to instruct its tanker driver to dump the waste water in the sewage plant.
In addition, the projects include digging of a number of wells in various divisions of Riyadh Region, as well as implementation of a sewage water treatment plant in Al Sulail and expansion of the existing sewage water treatment plant in Al Kharj (Phase-3).
Some 4,200 combined sewage outflows round the coast of Britain are still discharging raw sewage into the sea.
Faridi said the 450 million gallons of untreated sewage was dumped into the sea, and the greater sewage treatment plant would only be treating domestic sewage and not the waste produced by industries.
WATER quality is still being monitored on the beach of one of North Wales' top tourist resorts after a sewage leak.
LANCASTER -- A $4 million payment is being proposed to settle conflicts between state water regulators and sanitation district officials in Lancaster and Palmdale over whether enough progress is being made with orders to keep sewage off Air Force property and to clean up nitrates in groundwater.