Wastewater Equalization and Sewer Receiving Station

The City of Battle Ground Wastewater Equalization and Sewer Receiving Station project involved an engineering study, regulatory approval, detailed improvement design, and construction to improve sewer system performance and meet state requirements.

During peak storm events, wastewater systems are tested not by average conditions but by how effectively they manage inflow, infiltration, and storage capacity.  

In Battle Ground, Washington, with a population of over twenty thousand, recurring wet-weather flows driven by groundwater and surface water infiltration were exceeding system pumping capacity, threatening reliability and increasing the risk of sanitary sewer overflows.   

The City of Battle Ground partnered with Windsor Engineers to address these challenges through a comprehensive engineering study, regulatory approval, and the design and construction of new flow equalization facilities ensuring continued service, environmental compliance, and protection of public health and safety.  

Battle Ground’s flat terrain, high groundwater levels, and heavy seasonal rainfall required a solution grounded in data. Through advanced hydraulic modeling, Windsor Engineers and subconsultant Kennedy Jenks demonstrated that projected peak flows would exceed existing capacity without additional equalization storage. That modeling directly informed a precise, cost-effective design. 

Rather than constructing new storage tanks, the project team identified an innovative solution: retrofitting existing, unused concrete basins from a former wastewater treatment plant. This sustainable approach saved millions of dollars, reduced material use, shortened the construction schedule, and preserved land for future community development.  The project was constructed by Tapani Inc.

Additional improvements included a new sewer receiving station equipped with advanced screening technology to protect downstream systems, along with aeration upgrades that minimize odors near public spaces.  

Completed within budget and in time for seasonal storms, the project now provides reliable wastewater management that supports community growth while preventing overflows during peak events. 

Beyond Battle Ground, the project demonstrates how advanced modeling, creative reuse of infrastructure, and close collaboration with municipal partners can deliver resilient, scalable solutions for communities facing similar challenges.  

Through innovation, stewardship, and partnership, Windsor Engineers delivers high-performance infrastructure that safeguards public health and supports sustainable community growth.