Written By Olena Riznyk
AILSA CRAIG – During the December 17 council meeting of North Middlesex, Cameron Rickert, a water resources engineer with EXP, delivered a presentation updating councillors on the Stormwater Management Master Plan for Ailsa Craig, outlining existing drainage challenges, key technical findings, and recommended priorities for future infrastructure investment.
Rickert explained that Ailsa Craig is experiencing increasing strain on its stormwater system due to limited historic infrastructure, ongoing urban intensification, and more frequent and intense rainfall events. These factors have contributed to localized flooding, erosion, and capacity issues in several areas of the community. As development continues, the municipality requires a long-term plan to manage stormwater in a way that protects property, supports growth, and meets municipal and provincial requirements.
The master plan study area includes the entire urban boundary of Ailsa Craig, encompassing residential, institutional, and commercial lands served by the storm sewer network and outlet drains. For analytical purposes, the system was divided into six major catchments covering areas such as Main Street, William Street, Church Street, and surrounding residential neighbourhoods. This approach allows engineers to better understand how runoff moves through the system and where capacity constraints occur.
Rickert outlined the results of the hydrologic and hydraulic assessments, which were completed using standardized engineering methods to evaluate pipe capacity and overall system performance. While some storm sewer segments were found to provide adequate conveyance, a significant portion of the network is undersized under current conditions. Several catchments contain pipes operating above acceptable capacity limits, increasing the risk of localized flooding during heavy rainfall events. These findings point to the need for targeted upgrades to improve system resilience and accommodate future growth.
The presentation also reviewed the age and condition of adjacent underground infrastructure, including storm sewers, sanitary sewers, and watermains. Much of this infrastructure was installed between the 1950s and 1990s and is now considered middle-aged or beyond its expected service life. Sanitary sewers were largely installed around 1980, while many watermains date back to the 1960s and 1970s, with some recent rehabilitation completed on Main Street and Queen Street. Rickert noted that the overall condition of the network underscores the importance of coordinating stormwater upgrades with other underground renewal projects to reduce long-term costs and minimize disruption.
To support strategic decision-making, a weighted prioritization system was used to rank infrastructure segments based on capacity limitations, asset age, and known condition issues. This analysis identified William Street as a top priority for renewal due to structural deficiencies, confirmed defects, and aging infrastructure. Additional improvements were recommended in other catchments to address resident concerns and anticipated capacity pressures linked to ongoing development.
