Management of Sewer System Rehabilitation for the Overflow Abatement Program in Nashville, Tennessee

by C. Wayne Dillard, Gresham, Smith & Partners, Nashville, United States,
George E. Kurz, Gresham, Smith & Partners, Nashville, United States,
Paul A. Stonecipher, Gresham, Smith & Partners, Nashville, United States,



Document Type: Proceeding Paper

Part of: Pipeline Infrastructure II

Abstract:

To comply with a state order to abate overflows of wastewater from the sanitary sewerage system, the Nashville, Tennessee, Metropolitan Department of Water and Sewerage Services has undertaken a major program of rehabilitation and expansion of its collection and treatment facilities. Schedule constraints imposed by mandated completion dates required early rehabilitation design to proceed with limited data available on the extent of Infiltration/Inflow (I/I) problems in specific project areas. To address concerns on a system-wide basis, the program management staff recommended levels of overflow control based on storm recurrence intervals of two years and five years, and developed a defects classification system to provide objective criteria for evaluating most commonly observed defects and selecting proper rehabilitation measures. This paper presents the results of the defects identification and classification study, the recommended corrective measures options, and the success to date in program implementation. Evaluation of specific rehabilitation measures used is discussed along with relative costs and success rates experienced.

Subject Headings: Rehabilitation | Overflow | Defects and imperfections | Sewers | Water treatment plants | Infiltration | Wastewater treatment plants | Tennessee | United States

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