Changes

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"Hydrological changes associated with urbanization are increased storm runoff volumes and peak flows, faster flow velocities and shorter time of concentrations. A reduction in infiltration generally leads to less groundwater recharge and baseflow. The flashy response results in tremendous stresses for the urban stream and downstream receiving areas" (Walsh et al., 2005).}}

"Hydrological changes associated with urbanization are increased storm runoff volumes and peak flows, faster flow velocities and shorter time of concentrations. A reduction in infiltration generally leads to less groundwater recharge and baseflow. The flashy response results in tremendous stresses for the urban stream and downstream receiving areas" (Walsh et al., 2005)<ref>Walsh, C. J., A. S. Sharpe, and D. A. Burns. 2005. "The urban stream syndrome: Current knowledge and the search for a cure." Journal of the North American Benthological Society 24(3): 706–723. https://doi.org/10.1899/04-028.1</ref>}}

In order to protect downstream properties from flooding due to upstream development, Conservation Authorities establish flood control for future SWM planning through regularly updated of Hydrologic Studies and Subwatershed-level Stormwater Management Studies that characterize flood flow rates, define the location and extent of Flood Damage Centers and assess the potential impact of further urbanization. Flood mitigation strategies that incorporate Low Impact Development (LID), traditional stormwater management, and hybrid infrastructure can manage stormwater effectively and reduce flood impacts.

In order to protect downstream properties from flooding due to upstream development, Conservation Authorities establish flood control for future SWM planning through regularly updated of Hydrologic Studies and Subwatershed-level Stormwater Management Studies that characterize flood flow rates, define the location and extent of Flood Damage Centers and assess the potential impact of further urbanization. Flood mitigation strategies that incorporate Low Impact Development (LID), traditional stormwater management, and hybrid infrastructure can manage stormwater effectively and reduce flood impacts.