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Mayor Barry visits sewer rehabilitation project

Date added: 25-Jul-2016 07:34 AM

Mayor Barry visits sewer rehabilitation projectMayor Megan Barry recently visited Clean Water Nashville’s 28th Avenue Rehabilitation – Area 1 project site to learn more about how Nashville’s aging sewer infrastructure is being renewed. As pictured, B.J. Kersteins of Insituform Technologies, Inc. (the construction contractor for this work) shows Mayor Barry a cured-in-place pipe liner. The pipe liner is inserted in the sewer to renew the system without excavating streets. Repairing sewers in this way extends the life of the system and addresses downstream overflows by reducing the amount of rainwater that infiltrates the system.
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Community Engagement

Date added: 01-Mar-2016 08:19 AM

Community EngagementClean Water Nashville Overflow Abatement Program (CWNOAP) team leaders shared plans for renewing wastewater system infrastructure in North Nashville with over 150 area residents gathered for a February 27 community meeting hosted by Metro Council District 3 representative Brenda Haywood.
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2015 highlights include completion of major projects

Date added: 24-Aug-2016 08:50 AM

2015 highlights include completion of major projectsDODSON CHAPEL PIPE IMPROVEMENTS PROJECT, located in Metro Council Districts 11 and 14, was completed in December 2015.

MILL CREEK/OPRYLAND EQUALIZATION FACILITY, PHASE II, increased storage capacity with the addition of a 19-million gallon, pre-stressed concrete wastewater storage tank adjacent to an existing 15-million gallon tank. The project was completed in April 2015.

COWAN RIVERSIDE REHABILITATION AREA 1—JONES AVENUE was conducted to renew aging infrastructure and to address downstream overflows by reducing the amount of rainfall that can enter the system through defects.
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Service lines connect citizens to public sewer system

Date added: 10-Feb-2016 02:23 PM

Service lines connect citizens to public sewer systemTHE CLEAN WATER NASHVILLE PROGRAM is constructing sewer rehabilitation projects to renew sewer infrastructure and reduce overflows that may lead to water quality impairments. These sewer rehabilitation projects are located throughout the county, including large projects currently under construction in Council Districts 2, 5, 7, 8 and 29.
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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.