As Canada experiences more extreme rainfall, the risk of flooding increases, highlighting the growing need for innovative stormwater management solutions. Credit Valley Conservation constructed a smart blue roof in 2023 with commissioning and initial operations beginning in Spring-Summer, 2024. CVC’s smart blue roof was the first in Canada to be built in compliance with the Canadian Standards Association’s standard for Rainwater Harvesting Systems. The smart blue roof uses modulating control valves directed by a programable logic controller to open and close, allowing rainfall to be stored, reused or evaporated into the atmosphere. When these valves are closed, approximately 60,000L can be stored on CVC’s rooftop for flood control. When opened, water drains from the roof into the building’s 5,000L rainwater harvesting cistern to be used for non-potable uses like flushing of office toilets. The presentation will provide an overview of the planning, design, construction, commissioning, initial performance, challenges encountered, and lessons learned to date.