Cleanwater Nashville

Metro Water Services

News

Additional updates

Plans for CWWTP Expansion

Date added: 01-Sep-2017 02:47 PM

Plans for CWWTP ExpansionMetro Water Services is advancing plans for a major expansion of the Central Wastewater Treatment Plant (CWWTP). The plant was originally constructed in 1958 and has been expanded several times through the years to address environmental quality standards and to meet demands of Nashville’s growth.
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Clean Water Nashville projects nearing completion

Date added: 01-Sep-2017 02:44 PM

Clean Water Nashville projects nearing completionA handful of large-scale Clean Water Nashville Overflow Abatement Program (CWNOAP) projects will be completed in late 2017 and early 2018, renewing system infrastructure and boosting Nashville’s compliance with the Clean Water Act by reducing wastewater overflows into the environment.
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Remote-controlled cameras provide eyes for underground pipe repairs

Date added: 01-Sep-2017 01:38 PM

Remote-controlled cameras provide eyes for underground pipe repairsThe majority of Nashville’s sewer system lies hidden beneath streets and buried in easements. Since it cannot be readily observed, Metro Water Services (MWS) deploys a variety of technologies to assess the system’s condition.
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West Park Equalization Facility Phase II is taking shape

Date added: 23-Feb-2017 01:57 PM

West Park Equalization Facility Phase II is taking shapeConstruction of a new, circular-shaped 260-foot diameter, 21 million gallon wet weather storage tank increases the capacity of wastewater storage during wet weather events. The new storage tank will be utilized when sewer flows exceed the capacity of the existing West Park Pump Station.
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Assessing and rehabilitating manholes

Like so much of Nashville’s sewer system, manholes typically go unnoticed although they are all around us in the public rights-of-way and easements. Across 526 square miles of Davidson County there are tens of thousands of manholes that provide access to the underground sewer system. Many other manholes provide access to additional utilities.

Manhole covers, which are typically the only portion visible on the ground’s surface, are the top openings of structures that provide access to networks of underground utilities. For the sewer system, these access points serve a vital role to enable Metro Water Services to keep the sewer system in efficient working order. Like sewer pipes and service laterals, sewer manholes also require assessment, maintenance, rehabilitation, and sometimes replacement.

During numerous sewer evaluation and rehabilitation projects, the Clean Water Nashville Overflow Abatement Program assesses the condition of manholes to identify:

  • Structural damage or deterioration
  • Roots or other debris that may cause a blockage in the sewer system
  • Leaks that allow groundwater or rainfall to enter the sewer system
  • Safety or access concerns

Once the condition of the manholes is assessed and any immediate concerns are addressed, the collected data is reviewed to determine the most cost-effective approach to renew that portion of the sewer system. Options may include replacing a defective manhole cover, sealing any leaks in the manhole walls, or improving the flow hydraulics through the manhole. Commonly, manholes will receive a cementitious coating to the interior of the manhole to make it more waterproof and extend its useful life. In some situations, however, the existing condition of the manhole warrants a total manhole replacement.

manhole inspection process

Manholes are the windows to the health of the sewer system, and manhole renewal is an important component of Nashville’s commitment to improving its sewer system infrastructure.