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2022 STEP Webinar: Innovative Subdivision Design: Performance of a pond with upgradient LIDs
By Sara Finnimore

To achieve all stormwater management objectives, from flood control to maintaining the natural water balance and preserving water quality, stormwater management designs may use a treatment train approach that incorporates a combination of conventional and LID stormwater management practices. However, knowledge gaps remain for how the presence of LID practices upgradient in the catchment influence the design, performance, and maintenance needs of wet ponds. This is a consequence of the relative newness of this hybrid approach to stormwater management, meaning there is limited long-term monitoring data available. Since 2015, CVC has been conducting monitoring at a subdivision in Halton Hills that uses a treatment train approach incorporating both LIDs and wet ponds to manage stormwater. This monitoring has been used to answer key questions including: 1) is the wet pond with LIDs upgradient performing as designed? 2) What is the influence of the upgradient LID practices on the performance of the wet pond? and 3) How can the monitoring results inform asset management and future designs? The monitoring results suggest that the pond is in some ways exceeding design requirements but is also not performing quite as expected. The upstream LIDs appear to be providing significant volume reductions which may be impacting the water balance of the pond. Maintenance observations highlight some site-specific maintenance considerations and the importance of routine maintenance for all storms.

November 24
12:00pm - 1:00pm (EST)