Piloting new technology to reduce sediment and phosphorous released into Lake Simcoe watershed

The Town of Innisfil will pilot a project to address sediment and phosphorous release into Lake Simcoe from new land development, focusing specifically on smaller suspended solids (less then 40 microns). The current Ministry of Environment Technical Guidelines for sediment control does not allow for effective capture of those small particles. The pilot will target three stormwater management ponds using Clearflow Water Lynx block technology to reduce sediment and nutrient discharge to waterways and, ultimately, the lake. This technology should shorten settling time, which will increase capture of small particles in the ponds and improve the quality of the water entering the watercourse. As sediment capture increases in the ponds, their cleanout will be required to ensure the facilities effectiveness. If the pilot is successful, these techniques will be implemented in other stormwater management facilities in Innisfil, and potentially in the entire Lake Simcoe watershed. Innisfil will complete the following tasks as part of the pilot: install Water Lynx blocks; collect samples; complete technical design and maintenance details; ensure maintenance of installation (including pond cleanout when full); engage with stakeholders (Lake Simcoe region and Ontario conservation authorities, local communities, surrounding municipalities, regulatory agencies, developers, etc.); and prepare a report, presentation and guidelines to share with other Lake Simcoe communities. This pilot aligns with Innisfil’s Official Plan, in which drainage and stormwater are key areas of interest for sustainable infrastructure. It also aligns with the Lake Simcoe Protection Plan, which identifies phosphorus intake as one of the biggest challenges to Lake Simcoe’s water quality, and calls for it to be reduced by 44 tonnes per year. Innovative aspect(s): • This is the first known use of Clearflow Water Lynx technology for unstabilized site development • The Ministry of Environment’s current technical guidelines for sediment control measures are only effective for removing particles sized 40 microns and greater—this project’s focus on smaller particles could yield great environmental benefits for Innisfil, Lake Simcoe and many others Replicability: • This project could be replicated within Innisfil for future site development, and also throughout Lake Simcoe watershed communities • The Ontario Conservation Authority’s involvement means this technique could be shared with other municipalities experiencing similar issues throughout the province Environmental benefits: • Remove 90% of total suspended solids release from stormwater management ponds collected as a result of stormwater runoff during rainfall • Reduce excessive phosphorus-loading to Lake Simcoe • Reduce other metals and nutrients, including lead, zinc, magnesium, aluminum, silicon and organic compounds • Contribute to restoration of a self-sustaining coldwater fish community while maintaining a sustainable recreational fishery and its associated social benefits • Further develop the connection between chloride reduction and sediment removal to inform the town’s Salt Management Plan Economic benefits: • Reduce the town’s financial liability associated with non-compliance by exceeding targets for sediment management and stabilization for development sites • Help preserve Lake Simcoe’s watershed ecosystem, which has been valued at a minimum of $975 million a year Social benefits: • Improve the community’s quality of life by contributing to Lake Simcoe’s recreational enjoyment (Project description from original funding application)