Cole Engineering has been retained by the Regional Municipality of York to provide consulting services for the condition assessment and rehabilitation of nearly 2000 sanitary sewer laterals within five study areas, for the purpose of identifying and reducing infiltration on the public side of the laterals. Each of the study areas drain through a single outgoing sewer, where a flow monitor was installed. The flow monitors were in place for approximately nine months, prior to any lateral remediation taking place.
In each catchment, CCTV surveys were conducted of every sewer lateral, up to the property line. The outputs included video files, reports and an Access database. Cole Engineering took the Access database, which included all the PACP / LACP coding, and developed queries and scripts to rank the laterals in terms of their likelihood to be contributing to infiltration into the sewer. By analysing the defects and ranking, Cole Engineering determined the optimum rehabilitation strategy.
Once the rehabilitation has been completed, the flow monitors will be re-deployed to the same locations, and an analysis will be undertaken of the benefit of undertaking remediation on the public side of the laterals.
- Measured versus Theoretical Flow Rate Analysis
- Groundwater Infiltration Separation
- RDII Separation
- Rainfall IDF Curve Analysis
- I&I Projection
- Sewer Lateral Condition Assessment
- Risk Ranking
- Optimised Rehabilitation