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The goal of the Long Term Control Plan (LTCP) is to reduce overflows from combined sewer outfalls to improve water quality in the Missouri River and Papillion Creek. Under an agreement with the State of Nebraska, Omaha is committed to implementing the LTCP by October 2027 (extended by three years from 2024 due to the 2011 Missouri River flood).
The initial LTCP was developed, beginning in 2006 and approved in 2009. Implementation of the plan began in 2009.
This plan was developed in compliance with the requirements of:
The plan was extended by three years from 2024 due to the 2011 Missouri River flood. The City’s CSO Permit and amended Consent Order require an update to the 2009 LTCP. This update effort began in 2011. During the update, multiple evaluations were conducted including:
Additionally, the update focused on saving ratepayer funds while meeting the original objectives of the LTCP. The implementation schedule was revised to fit the rate model.
Existing single-pipe combined sewer systems will be separated in targeted areas of the city to carry stormwater and sanitary sewage in separate pipes. New sewers will be installed to convey either the sanitary sewage or stormwater, and existing pipes will be used to carry the other flow.
This includes a 5.4-mile tunnel along the Missouri River from combined sewer outfalls located north of Cuming Street to the Missouri River Wastewater Treatment Plant (located south of the Hwy 275 bridge). The tunnel will be approximately 170 feet below the surface, approximately 15 feet in diameter and will convey combined sewage to a new high-rate treatment plant adjacent to the current Missouri River Wastewater Treatment Plant. The tunnel will store the combined runoff until it can be treated and discharged to the Missouri River.
High-rate treatment facilities will be built at the Missouri River Wastewater Treatment Plant and near 64th and Dupont Streets to treat potential overflows before they reach the Missouri River and Papillion Creek. These facilities (Saddle Creek RTB) are designed to treat overflows during wet weather events when the combined sewer system’s capacity is inadequate. Between rain events the facilities will be emptied and cleaned.
Missouri River Wastewater Treatment Plant Improvements – This project includes upgrades to the existing plant to maximize treatment of wet weather flows.
South Interceptor Force Main – Replacement of the existing force main to provide reliable conveyance of wastewater and combined sewage to the Missouri River Wastewater Treatment Plant.
South Omaha Industrial Area Force Main & Gravity Sewer and South Omaha Industrial Area Lift Station (completed) – These projects ensure that the high-strength wastewater will be treated at the Missouri River Wastewater Treatment Plant during wet weather events. The projects also reduce odors in the existing combined sewer system.
Below-ground storage tanks will be built near Benson Park and southwest of the North Omaha Power Plant (along Pershing Drive). These will capture overflows during rain events when the combined sewer system’s normal capacity is inadequate. Between rain events the facilities will be emptied and cleaned. Additionally, a storage tank will be built at the MRWWTP and the City’s Joint Use Facility near 22nd and Y Streets.
The Minne Lusa Stormwater Conveyance Sewer will consist of approximately 6,100 feet of 14 foot diameter pipe. The sewer will convey separated stormwater from completed and future sewer separation projects in the Minne Lusa Basin to a large detention basin.
The City's requirement to address CSOs is based on the Clean Water Act of 1972, the CSO Control Policy of 1994, the subsequent Wet Weather Water Quality Act of 2002, and the City's Consent Order and discharge permit from the Nebraska Department of Environmental Quality (NDEQ).
During development of the 2009 LTCP more than 140 community volunteers served on basin and community advisory panels. Initially, these groups met and developed eight non-monetary criteria used in determining the best and most cost-effective solutions outlined in the LTCP.
This criterion defines the reduction in the number of combined sewer backups into basements and existing sewer odors in the combined sewer service area.
This criterion defines water quality improvements in the receiving streams above and beyond the minimum requirements to comply with state and federal regulations. This would also include consideration for storm sewer water quality regulations that may be required in the future.
This criterion defines the amount of community disruption that would be expected during construction of CSO solutions based on the assumed duration (months) of disruptions for major arterial streets (commercial/business disruption) and residential streets, as well as the total distance of disruption (blocks or linear feet of disruption). Specific goals include:
This criterion defines the coordination between improvements for the CSO Program and the potential for replacement of other aging utility infrastructure. Opportunities might include:
This criterion defines the potential enhancements for the community achievable through leveraging other funding sources during construction of the projects. Enhancements could include:
Green space / parks
Other amenities and support for future development in the community
This criterion defines the long-term compatibility of a particular alternative with the community, considering aesthetics and other benefits of the proposed facilities. Alternatives might include:
This criterion defines the reduction of street flooding. Evaluation was based on improvements to the collection system to increase in-basin conveyance of combined sewers, additional stormwater conveyance, or percent separation of sanitary and storm sewers in portions of the basin.
This criterion defines the operations and maintenance impacts of the proposed facilities. It also includes the reliability of the facility/facilities to function during wet weather events. Examples include: