> System Improvments > Rehabilitation Methods

Planning Phase | Rehabilitation Methods | Back to System Improvements

Rehabilitation Projects include all work on gravity sewers and manholes. The gravity sewer is generally constructed in public rights of way or utility easements. The gravity system is a network of pipes that allows wastewater from homes and businesses to flow downstream to a network of pumping stations. The pump stations then send the wastewater to a wastewater treatment facility. At each change in the pipe's direction or every 300 feet or so, there is a manhole, allowing the pipe to change direction and for system maintenance.


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on CCTV Sewerline
Inspection

All Rehabilitation work begins with a Collection System Evaluation Study (CSES), which involves the testing of all gravity sewers and manholes in the system for cracks, leaks or deterioration. SSERP engineers employ several innovative methods in searching the S&WB's pipelines for damage, including smoke testing, dye flooding, flow monitoring and closed circuit television (CCTV) inspections.

CSES data is then compiled into a Remedial Measures Action Plan (RMAP), a report indicating the exact locations work is needed on specific lines and manholes. The RMAP is sent to the EPA for approval.



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on Manhole
Inspection
Upon receiving approval from the EPA, the project goes into the design phase, during which SSERP engineers review CCTV data compiled during the CSES phase to determine exactly what repairs need to be done to a sewer line or manhole. During the design phase, the RMAP is separated into smaller projects. Specifications and drawings are prepared, and the projects are advertised, competitively bid upon and awarded to the lowest responsive bidder.


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on Point Repair

At this point, construction begins. Depending upon the nature of the damage, gravity sewer pipe rehabilitation could require point repairs, the installation of pipe liners, or the replacement of the entire pipe. Since the excavation and replacement of pipes is extremely time-consuming and disruptive to surrounding communities, SSERP engineers make sure that trenchless repairs are made whenever possible.



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on Full Pipe
Lining
Trenchless repairs include the installation of pipe liners and pipe bursting, both of which happen with minimal or no digging. Whenever digging is necessary, crews do everything in their power to keep the inconvenience caused by a project to a minimum.


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on Manhole
Rehabilitation

Aging sewer manholes are being rehabilitated through the addition of lightweight cementitious lining, the replacement of frames and covers, and by raising the covers to match the surrounding ground level.



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