Tuesday, September 10, 2024
2:30 PM - 3:00 PM
Location Name
Maximizing Return on Investment for your Sanitary Sewer Evaluation Survey (SSES) Program
Rehabilitation - WW

Introduction Sanitary Sewer Evaluation Surveys (SSES) have been a long-standing tool used by utilities in an attempt to reduce infiltration and Inflow (I&I) and sanitary sewer overflows to maintain regulatory compliance and maximize system capacities. However, traditional approaches have often resulted in high costs of assessment and rehabilitation, often with less significant performance improvements than anticipated. Topic Background Traditional SSES approaches have relied heavily on CCTV inspections for identification of defects followed by CIPP rehabilitation. Both of these approaches have a high cost per linear foot of pipe and when implemented on a broad basis can result in high costs on a dollar per gallon ($/gal) of removed flow basis. Based upon extensive experience, there are many lessons learned that have refined the approach to SSES that reduces both the CCTV and amount of pipeline and manhole rehabilitation to maximize returns. Discussions of the topic will be focused on the newer methodologies and technologies being implemented to prioritize basins down to sub-basin levels and then targeting rehabilitations to give owners their lowest cost investment for the highest value improvements. Critical to this process being discussed is the verification that measures the anticipated improvements through reduced I&I flows, elimination of sanitary sewer overflows and correction of structural failures. Presentation Summary This presentation will review the unique approaches to implementing SSES with targeted goals that include: 1. Leveraging existing system information that includes system maps, hydraulic models, pump run times and flow data to develop a work plan and target basins for investigation. 2. Identification of priority sub-basins and initial field assessments through enhanced flow monitoring, rain fall monitoring and parametric quantification of I&I flows. 3. Defect identification and corrective action plans derived through targeted field investigations that include smoke testing, CCTV and other methods for lowest cost and highest returns. 4. Comparing traditional and emerging rehabilitation methods for collection, pumping and transmission systems that are specific to local conditions and system defects. 5. Verification achievement of performance improvements through flow metering and data analysis that is then incorporated back to owners GIS, hydraulic modeling and asset management systems. Case Studies The presentation will also include a range of case studies of implementing tailored SSES systems that include quantifiable results compared with costs of implementation. These case studies will discuss the challenges, unique approaches and lessons learned.