LID Performance Monitoring

LID Performance Monitoring

Here at Credit Valley Conservation, we continue advance low impact development (LID) approaches to managing stormwater. We’re excited to announce the latest round of LID performance monitoring results. With 12 intensely monitored sites, we’re taking a close look at innovative technologies that slow down, cool and filter stormwater, allowing it to soak it into the ground. LID uses a combination of natural and built features to achieve these goals, and we’ve been monitoring LID practices continuously for more than six years.

Absorbing and cleaning stormwater from roads, parking lots and public spaces can take a toll on LID features such as rain gardens and permeable pavers over time. Accumulated sediment, nutrients, heavy metals, oils and grease can limit LID performance over time. This is a common concern among municipalities and other agencies interested in owning and operating LID technologies. These difficult conditions prompt the question – how long can LID features last before maintenance or repair is needed? Our field monitoring and technical staff have been working hard to find answers, and that hard work is beginning to pay off.

Long-term performance results show that, for many of the sites monitored, the LID practices exceed expectations. Even after several years, living soil/plant mixes can filter out more than 80% of sediment, significant amounts of harmful heavy metals and more than 90% of phosphorous – a nutrient responsible for unchecked algae growth in our lakes and along our beaches. To learn more about our exciting work on LID performance monitoring, or to read more about the performance of different types of LID features in the Credit River watershed, visit

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