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National Pollutant Discharge Elimination System (NPDES)
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Sanitary Sewer Overflows and Peak Flows

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Resort documents: | By Name |     | By Date |
  • Case Study: Clearwater, Florida Abates Sanitary Sewer Overflows Using the EPA Region 4 Management, Operations and Maintenance Approach (PDF) (679KB)

  • Clearwater, Florida performed a self-assessment of its sewer collection system and developed a Maintenance, Operations, and Management (MOM) Plan using the Region 4 approach. The MOM Plan, which will be fully implemented in 2008, helped Clearwater significantly reduce sanitary sewer overflows and emergencies within a year.
    Date Published: 07/18/2002

  • Case Study: Fairfax County, Virginia Implementing an Integrated CMOM Program for SSO Control (PDF) (27 pp, 517KB)

  • Documents a medium-sized wastewater collection utility's approach to developing and implementing an integrated CMOM program. Fairfax County discovered that all the elements of CMOM must be addressed if the desired results are to be achieved.
    Date Published: 01/07/2002

  • Case Study: Greenwood County, South Carolina (PDF) (17 pp, 257KB)

  • The Greenwood Metropolitan District used a good Comprehensive Management, Operations, and Maintenance Plan (CMOM) to abate sanitary sewer overflows (SSOs) and bring community leaders to consensus on difficult and expensive infrastructure problems.
    Date Published: 03/01/2001

  • Case Study: Johnson County, Kansas Public Inflow/Infiltration Program Reduces Sanitary Sewer Overflows (PDF) (10 pp, 157KB)

  • Johnson County, Kansas implemented a five-year phased inflow/infiltration (I/I) reduction program that successfully eliminated capacity-related SSOs up to the 10-year, 1-hour storm event, by reducing stormwater infiltration and groundwater inflow into the system by as much as 280 million gallons per day (mgd) during periods of wet weather. A major component of the program was the identification and elimination of sources of I/I from private property to the sewer system.
    Date Published: 01/11/2001

  • Case Study: Oklahoma City, Oklahoma (PDF) (12 pp, 286KB)

  • Oklahoma City, Oklahoma controls sanitary sewer overflows (SSOs) throughout its expansive sewer collection system by replacing approximately 1 percent of sewers every year. This rate ensures complete system replacement every 100 years. The program has been implemented without the need for significant debt or rate increases.
    Date Published: 11/01/2001

  • Case Study: Wellington, New Zealand Asset Management Program (PDF) (465KB)

  • Features the asset management approach Wellington uses in redeveloping its aged sewer system into a modern, properly-functioning network with adequate capacity for collection and treatment.
    Date Published: 11/01/2003