About the Project
Madison Metropolitan Sewerage District maintains a sanitary sewer force main that runs along
the east side of Stoughton Road on Madison’s east side. A force main is designed to handle
pressurized flow (versus gravity flow) and enables wastewater to reach the treatment plant.
The existing force main, installed in 1964, shows signs of corrosion. To extend the life of the
pipe, improve flows and prevent groundwater infiltration, district crews plan to install a pipe
lining within the existing force main between Buckeye and Cottage Grove roads. The existing
force main in this area runs within the railroad corridor, so minimal disruption is anticipated.
The project will take about one month to complete. The district is working with its contractors to finalize the schedule and construction is expected to get underway between October 2018 and May 2019.
Putting a pipe within a pipe
To rehabilitate the 36 inch diameter pipe, the district intends to install a tight fitting, high density polyethylene lining. The installation process involves compressing and pulling the plastic pipe lining into position inside the existing pipe, then releasing the tension so that the pipe lining expands inside the existing forcemain to achieve the same or better strength and capacity.
While the pipe lining is being installed, wastewater from the existing pipe will be sent around the work area through a temporary bypass pipe.
Process protects environment, saves time and money
Since the lining process requires minimal digging, it is less costly, time consuming and disruptive to the public and the environment than excavation and pipe replacement with traditional open-cut methods. However, the use of other equipment on site may generate some noise between 7 p.m. and 7 a.m., which requires a noise variance.
The project reflects the district’s efforts to maintain aging infrastructure in a way that protects public health and the environment while delivering reliable services at an acceptable cost. Questions may be directed to project engineer Kelly Sullivan at (608) 222-1201 ext. 293, or email@example.com.