Cleanwater Nashville

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Additional updates

Clean Water Nashville Program 5-year Update

Date added: 23-Feb-2017 01:47 PM

Clean Water Nashville Program 5-year UpdateNow in its sixth year, the Clean Water Nashville Program has achieved considerable advancement for both environmental compliance and overall system improvements across Davidson County. Program highlights include:
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Conveyance Improvements Underway

Date added: 03-Jan-2017 12:53 PM

Conveyance Improvements UnderwayThe Brick Church Pike Pipe Improvements project illustrates the sometimes demanding challenges that are encountered as Clean Water Nashville Overflow Abatement Program (CWNOAP) renews and enlarges Davidson County’s sewer system.
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Lakewood water, wastewater modernization complete

Date added: 24-Aug-2016 09:18 AM

Lakewood water, wastewater modernization completeThe large-scale project, which began in January 2014, modernizes water and wastewater systems throughout residential and commercial areas in District 11.
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Cured-in-place pipe lining seals the deal

Date added: 24-Aug-2016 09:19 AM

Cured-in-place pipe lining seals the dealCured-in-place pipe (CIPP) lining is one of several sewer rehabilitation methods used to repair leaking or structurally unsound existing pipelines. Little to no digging is involved in this trenchless process, making for a more cost-effective, environmentally friendly process that is completed more quickly and with fewer impacts and disruptions than pipe replacement.
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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.