Cleanwater Nashville

Metro Water Services

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Additional updates

Metro Nashville receives CAP/ER approval

Date added: 01-Mar-2018 07:39 AM

Metro Nashville receives CAP/ER approvalIn late August 2017, the U.S. Environmental Protection Agency (EPA), in conjunction with the Tennessee Department of Environment and Conservation (TDEC), approved the Corrective Action Plan / Engineering Report for Sanitary Sewer Overflows (CAP/ER). The CAP/ER outlines Metro Water Services’ plan to address sanitary sewer overflows (SSOs) in Davidson County and is one of two key pillars of the Clean Water Nashville Overflow Abatement Program.
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CWWTP: Gathering neighborhood input

Date added: 01-Mar-2018 07:28 AM

CWWTP: Gathering neighborhood inputOn January 15, 2018, Metro Water Services (MWS) participated in a meeting with residents from the redeveloping neighborhoods of Salemtown and Germantown to discuss the improvements to the nearby Central Wastewater Treatment Plant (CWWTP).
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Assessing and rehabilitating manholes

Date added: 01-Mar-2018 07:16 AM

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