CITYWIDE SANITARY SEWER SYSTEM I/I – FLOW MONITORING PROGRAMS -PROJECT DESCRIPTION

The City has developed Inflow/Infiltration Reduction Programs to improve the service of the sanitary sewer system and to reduce and mitigate adverse impacts which could result from potential inflow/infiltration (I/I) sources into the sanitary sewer system. Increased sewer capacity, reduction of system surcharge, backups and basement flooding are just a few of the benefits of I/I reduction program. It is important to measure flows in the sewer system during dry and wet weather conditions to understand the flow pattern and to identify any potential sources of inflow and infiltration.

The City identified high priority I/I source locations during dry and wet weather conditions. Civica installed permanent flow meters at the upstream of (i.e. incoming sewer) in the wet-wells of pumping stations or the first manhole before the wet well at nine (9) existing sanitary pumping stations. Also, Civica installed temporary flow meters in identified in five (5) high priority I/I source locations. The temporary flow meters were installed in Vaughan’s local sewers. All stations collecting flow and rainfall data underwent Civica’s detailed QA/QC procedures prior to analysis for dry-weather flow, groundwater infiltration (GWI) rates, and wet weather flow.