Client: City of Waukesha

Location: Waukesha, Wisconsin

Donohue completed a two-phase project to develop a Sanitary Sewer Master Plan for Waukesha. This project identified the most cost-effective combination of Inflow and Infiltration (I/I) reduction, increased conveyance, and/or flow equalization to provide reliable wastewater collection for current and future customers. The first phase focused primarily on evaluating system flows and capacities and included the following:

• Hydraulic Modeling and Calibration using MIKE URBAN
• Flow Monitoring
• I/I Study
• Interceptor Sewer Modeling and Preliminary Design
• CMOM Program Planning
• Smoke Testing
• Pump Station Flood Protection
• Force Main Condition/Reliability Assessment
• Pump Station Hydraulic Evaluation

The second phase further refined the alternatives and focused on system condition and integrity. Tasks included:

• Preparation of a CMOM Plan in compliance with EPA guidelines and meeting the City’s goals and requirements
• System condition assessment expanding on the flow and system improvement analysis conducted in Phase I
• Development of a cost-effective program to maintain gravity and force main sewers including a Sewer System Evaluation Survey (SSES) for portions of the system with high I/I
• Alternatives Analysis
• Recommendations for additional interceptors to eliminate pump stations serving the western and southeastern portions of the sewer service area

The end result was a 20-year Capital Improvement Plan (CIP) for the City that is serving as a roadmap for improvements.