Combined sewer overflow


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Combined sewer overflow

A combined sewer system conveys both sanitary sewage and stormwater in one piping system. During normal dry weather conditions, sanitary wastewater collected in the combined sewer system is diverted to the wastewater treatment plant before it enters natural waterways. During periods of significant rainfall, the capacity of a combined sewer may be exceeded. When this occurs, excess flow, a mixture of stormwater and sanitary wastewater, is discharged at CSO points, typically to rivers and streams. Release of this excess flow is necessary to prevent flooding in homes, basements, businesses, and streets.
References in periodicals archive ?
The mandated federal and state projects for Worcester over the next five years are: Upper Blackstone 2008 discharge permit, $208 million; EPA stormwater permit, $950 million; EPA combined sewer overflow permit, $5 million; dam maintenance, $9 million; sustainable water management initiative, $5 million; and sanitary sewer system upgrades, $14 million.
A valuable knowledge resource for stormwater utilities that includes elements of how to address combined sewer overflows and data related to billing consumers was released today.
The city maintains the flexibility to prioritize green investments in areas of the City that will benefit most from the resulting reductions in combined sewer overflows (CSOs).
In order to reduce the frequency of overflows, DEP has proposed a rule intended to slow the flow of stormwater from sites, mitigate flooding and sewer backups, and protect the sewer system and decrease combined sewer overflows.
While the administration proposed $450 million for sanitary and combined sewer overflow remediation, it requested only $850 million for the CWSRF.
The Heliscreen system will be used as part of a combined sewer overflow (CSO) mitigation project at Farmington's East Treatment Plant.
5 billion Combined Sewer Overflow (CSO) project by the year 2025.
The four-month scheme involves building a new combined sewer overflow and new sewers.
Major components include reconstruction of historic bulkhead walls, the creation of mooring facilities for Great Lakes cruise vessels, the recreation of a historic bridge, and the demolition and relocation of a combined sewer overflow outfall.
The combined sewer overflow (CSO) policy, developed as the result of a negotiated rule-making in which NLC participated, was promulgated by EPA in 1994.
Under the settlement, the MWRD will work to complete a tunnel and reservoir plan to increase its capacity to handle wet weather events and address combined sewer overflow discharges.
The five-month combined sewer overflow scheme, which is to begin next Monday, will improve water quality to East Howle Beck in the Metal Bridge area of Ferryhill.
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