Sanitary Sewer Overflows and Peak Flows
* Files are best viewed in Internet Explorer and Adobe 8.0 or higher.
- Case Study: Wellington, New Zealand Asset Management Program (PDF)
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.
- Case Study: Clearwater, Florida Abates Sanitary Sewer Overflows Using the EPA
Region 4 Management, Operations and Maintenance Approach (PDF)
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.
- 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.
- 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.
- 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.
- 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.