Inflow and Infiltration Reduction Study and Sanitary Sewer Modelling-Project Description

In the rapidly evolving field of wastewater management, municipalities, and land developers continually seek effective solutions for inflow and infiltration issues. The Town of Amherstburg’s recent inflow and infiltration reduction study and sanitary sewer modelling project, led by Civica Infrastructure Inc., serves as a prime example of how advanced methodologies and comprehensive strategies can address these challenges.

This case study outlines the project’s objectives, methodologies, and insights, providing valuable lessons for other municipalities and developers facing similar issues.

We were tasked by the Town of Amherstburg to conduct an in-depth inflow and infiltration (I&I) reduction study and develop a comprehensive sanitary sewer model. The primary goal was to identify potential sources of inflow into the sanitary sewer system, prioritizing areas for rehabilitation. This extensive field investigation program targeted catchments with high I&I levels and historical flooding issues.

To meet these objectives, we developed a detailed approach involving data collection, hydrodynamic model development, and sanitary sewer capacity analysis. Key activities included the installation of 16 flow monitors across sewer mainlines and sewage pumping stations, aimed at establishing dry-weather flow patterns and assessing wet-weather responses. This setup allowed for accurate model calibration, closely reflecting the observed conditions within each sewershed.

The field investigations identified 43 defects, including issues with catch basins, cleanouts, downspouts, and surface water drains. The estimated peak flow from these sources was approximately 81 liters per second, highlighting the significant impact of these defects on the system’s performance.

Relevance of Experience

Civica’s experience in environmental monitoring, flow monitoring, data analysis, and resident engagement was crucial to the project’s success. Our expertise in hydraulic modelling, mapping, and reporting ensured that the project’s outcomes were both accurate and actionable. The analysis of inflow and infiltration, coupled with defect remediation recommendations, provided a clear path forward for the Town of Amherstburg.

One of the standout elements of the project was the comprehensive stakeholder communication plan. Effective engagement with residents and other consultants facilitated smooth inspections, smoke and dye testing, and foundation drain inspections on private properties. This collaboration was essential in gathering the accurate and reliable input data needed for successful model outputs.

Lessons Learned

Consistent Communication Is Key: Active and consistent communication with multiple stakeholders, including the Town and other involved consultants, proved crucial for the project’s success. Regular updates and transparent dialogues ensured that all parties were aligned and any issues were promptly addressed.

Robust Stakeholder Communication Plan: A well-structured stakeholder communication plan was vital for conducting successful investigations on private properties. This plan encompassed lot inspections, smoke and dye testing, and foundation drain inspections, ensuring that residents were informed and cooperative throughout the process.

Accurate Data Collection:  The accuracy and reliability of model input data were paramount. Achieving this required rigorous QA/QC measures, extensive field investigations, and additional flow and rainfall wastewater monitoring. The quality of the data directly influenced the success of the modelling outputs, underscoring the importance of a comprehensive water flow monitoring system and

thorough data analysis.

Choose Civica for Expertise in Inflow and Infiltration Reduction

Amherstburg’s inflow and infiltration inspection and sewer modelling project highlights the importance of advanced methods and strategic planning in wastewater management. Utilizing our expertise, the project identified major I&I sources and offered actionable remediation insights.

Are you interested in learning more about how to optimize your municipality’s sewage water management? Consider partnering with experts like Civica to leverage cutting-edge technologies and proven strategies for sustainable solutions. Contact us today for more information.