Glossary of Water & Wastewater Terms

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Service Pipe - The WSAA defines a Service Pipe as a water pipe that supplies water from the reticulation main to the consumer. The portion of the service pipe under the control of a Water Agency generally terminates at the water meter, or in the case of fire services, the isolating valve of the fire protection system.

Sewage - Sewage is domestic or industrial waste water which is discharged to a sewer system.

Sewage Pump Station - A Sewage Pump Station (SPS) is a pump station designed to pump sewage either directly or via an intermediate pump station to a Wastewater Treatment Plant.

Sewer - A sewer is a pipeline or other construction, usually buried, designed to carry sewage.

Sewer Access Point - A Sewer Access Point is a pit or a shaft designed to allow access to a sewer for maintenance.

Sewer Flow Monitor - A Sewer flow monitor is a device used to assist with determining the inflow and infiltration into the sewer system. Monitors are installed at key points of the system to continuously record flow depth and flow velocity. In conjunction with rainfall data, the sewer flow rate can be correlated with rainfall events. A hydrograph displays the variation of sewer flow over time.

Sewer Lamphole - A sewer lamphole is a reticulation sewer end of line access point to allow limited access to facilitate inspection or clearing of obstructions.

Sewer Maintenance Hole - A Sewer Maintenance Hole is a Sewer Access Point with a removable cover which allows human and machine access to a (typically buried) Sewer.

Sewer Maintenance Shaft - A Sewer Maintenance Shaft is a Sewer Access Point on a sewer between Sewer Maintenance Holes, larger than inspection openings, which provides equipment access but not person access to the sewer and which allows limited change of grade and/or direction; used where appropriate as an alternative to Sewer Maintenance Holes.

Sewer Manhole - Sewer manhole is a deprecated term for Sewer Maintenance Hole.

Sewer Relining - Sewer Relining is a Renewal Activity, where a PVC pipe is inserted or extruded into a clay or concrete Gravity Sewer, nearing the end of its life.

Sewer Surcharge - Sewer surcharge refers to the overloading of the sewer beyond its design capacity due to inflow and infiltration of water. A surcharging sewer often results in sewer overflow at manholes and customers' over flow relief gully, ORG.

Sewer System - A Sewer System is a network of pipelines and ancillary works that conveys sewage to a treatment works or other place of disposal.

Sewer Terminal Maintenance Hole - A sewer terminal maintenance hole is an end of line sewer access point with a removable cover which allows human and machine access to a sewer. A sewer terminal maintenance hole provides access to the sewer system for customer sanitary drains via property connection sewers.

Sewer Terminal Maintenance Shaft - A Sewer Terminal Maintenance Shaft is a Sewer Access Point to allow insertion into the sewer of equipment for CCTV inspection and maintenance.

Sewerage Treatment System - A sewerage treatment system (or sewerage network) is the infrastructure used to receive, transport and treat sewage or effluent, including sewers, access chambers, machinery, outfalls, pumps, structures and vents."

Sludge Drying Bed - A sludge drying bed is an open area at water treatment plant or a wastewater treatment plant where moist sludge is left to dry.

Spiral Cracking - Spiral cracking is a pipe failure mode. As the name suggests it presents as a crack that spirals around the circumference of a pipe.

Stop Valve - A stop valve or isolating valve is a valve type that is used to permanently or temporarily stop flow in a pipe. Ball valves, gate valves, globe valves and check valves are the most common subcategory of stop valves.

Valve - A valve is a device that regulates the flow of substances (either gases, fluidised solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways.


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