Background
The City of Sheboygan experienced severe shoreline erosion around the manholes of its 1930s era interceptor sewer system due to rising Lake Michigan water levels. The threat of the manholes being breached by lake waters and the advanced age of the sewer system prompted the city to investigate remediation needs and alternatives. Foth performed a system condition and capacity analysis to determine the life expectancy and capacity of the existing pump station and interceptor.
Approach
The team performed pump station and forcemain capacity evaluations to determine limitations of the current pumping system. CCTV and flow monitoring were used determine the condition of the interceptor and manholes and the ultimate capacity of the interceptor. Flow projections were summarized in a feasibility study, along with recommended improvements and alternatives, associated cost estimates for each alternative, and a recommended timeline for improvements.
Our investigations found the structural condition of the sewer to be excellent, with minor defects at the manholes. We recommended armoring the manholes and installing an access road and revetment system. In addition, we provided recommendations on funding resources.
Markets: Municipalities
Services: Water and Wastewater
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