The Billion Dollar Leak-Tackling Sewer Inflow and Infiltration

Hi Everyone

Thank you for subscribing to this newsletter. I wanted to recap and share my thoughts about this event. I hope everyone has a great day!

My Opinion:

This event was inspired by our ongoing struggle to find solutions for Infiltration and Inflow (I&I) in sewer systems, a challenge that has persisted for decades. Despite numerous Sanitary Sewer Evaluation Studies (SSES), a comprehensive solution for effectively identifying and repairing I&I issues remains elusive.

This is crucial because I&I can cause a range of problems, including sanitary sewer overflows and operational difficulties at wastewater treatment facilities. Causes of I&I include structural issues like cracks, faulty seals, improper connections, and pathways that vary depending on local conditions.

Infiltration occurs when groundwater seeps into sewer pipes through cracks and deteriorated manholes, while inflow involves stormwater entering the system through illegal connections, such as basement sump pumps or foundation drains illegally connected to the sewer. These factors contribute to the large volumes of I&I, overwhelming sewer systems and leading to overflows and system strains.

The annual cost for SSES to address these issues ranges significantly $50k -$1M+ annually. The real challenge is multifaceted: lack of capital budgets for comprehensive rehabilitation, insufficient oversight and accountability in contractors’ workmanship, and finding funds for repairs.

These issues are compounded by a procurement system that often overlooks best value considerations. Understanding these complexities is key to addressing the billion-dollar leaks in our sewer systems.

Episode Recap:

In the world of infrastructure, few issues have plagued communities as persistently as sewer infiltration and inflow (I&I). Despite decades of effort and millions of dollars spent on flow monitoring and other methods, the problem of I&I continues to persist. In this thought-provoking discussion, I had the pleasure of speaking with two industry experts, Barbara Robinson binson and Michael Simpson, who shared their insights on the challenges and potential solutions for addressing I&I in sewer systems.

The Cost of I&I

Barbara Robinson, a civil engineer with a specialization in sewers, highlighted the need for public education on the importance of maintaining private side sewers. She emphasized that 60% of I&I originates from the private side, making it crucial for residents to understand their responsibility in maintaining their sewer laterals. Robinson stressed the need for engineers to be trained in building codes related to sewers, enabling them to educate residents on proper sewer operation and maintenance. She recommended regular CCTV inspections of private laterals, emphasizing that homeowners should have their lateral inspected every five years to identify potential issues and reduce I&I.

Michael Simpson son, a water industry veteran, echoed Robinson's sentiments and emphasized the need for a shift in mindset when it comes to addressing I&I. He highlighted the importance of using technology to tackle the problem, particularly in the collection system. Simpson advocated for the use of advanced tools, such as ElectroScan technology, to identify and quantify defects in sewer pipes. By utilizing these tools, municipalities can prioritize repairs and replacements based on accurate data, rather than relying on outdated maps and incomplete records.

Rethinking I&I Studies

Both Robinson and Simpson emphasized the need to rethink the traditional approach to I&I studies. Robinson argued that the focus should be on developing I&I programs rather than conducting extensive studies. She advocated for a more practical approach, focusing on smaller drainage areas and updating records as repairs and replacements are made. Robinson also highlighted the importance of engaging all departments within a municipality, including the building department, engineering department, and development group, to ensure a comprehensive approach to I&I reduction.

Simpson emphasized the role of technology in streamlining the I&I reduction process. He highlighted the use of scanning technology to identify defects and quantify inflow in sewer pipes. By scanning sections of pipe between manholes, municipalities can prioritize repairs and replacements based on accurate data. Simpson also stressed the importance of education, from the general public to local politicians, to promote the use of technology and overcome resistance to change.

The Impact of I&I

The implications of I&I are far-reaching and extend beyond the immediate cost of repairs and replacements. Robinson highlighted the impact of I&I on wastewater treatment plants, noting that I&I becomes sewage and requires additional treatment. By reducing I&I, municipalities can mitigate the strain on treatment plants and avoid costly expansions. Simpson emphasized the impact of I&I on system capacity, particularly in the face of climate change. By addressing I&I, municipalities can better handle extreme weather events and ensure the resilience of their sewer systems.

Conclusion and Future Outlook

Addressing I&I in sewer systems requires a multi-faceted approach that encompasses public education, technological advancements, and a shift in mindset. Both Robinson and Simpson stressed the importance of education at all levels, from residents to politicians, to promote the use of technology and overcome resistance to change. By utilizing advanced tools and rethinking traditional approaches, municipalities can prioritize repairs and replacements based on accurate data, reducing the cost and impact of I&I.

The future of sewer systems lies in embracing technology and adopting a proactive approach to I&I reduction. By investing in the collection system and utilizing tools such as Electro Scan technology, municipalities can identify and address INI more effectively. Public education and engagement are crucial in promoting the use of technology and ensuring the long-term sustainability of sewer systems. With a concerted effort and a willingness to embrace change, the billion-dollar leak of I&I can finally be addressed, leading to more resilient and efficient sewer systems for communities around the world.

Check out the full episode:

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DM Chad Smeltzer

CEO Bidcurement CEO The Infrastructure Network

Host The Infrastructure Hot Seat Podcast