Changes

In order to protect downstream properties from flood increases due to upstream development, CVC and TRCA have established flood control targets (2012 Stormwater Management Criteria Document) for future SWM planning through the process of updating 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.

In order to protect downstream properties from flood increases due to upstream development, CVC and TRCA have established flood control targets (2012 Stormwater Management Criteria Document) for future SWM planning through the process of updating 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.

The MOE SWMPD Manual (2003) and the CVC/TRCA LID Manual (2010), describe a number of practices that can be implemented to provide quantity control treatment of stormwater runoff as part of urban development. Examples of SWM practices that can be applied to provide stormwater quantity control include:

Examples of SWM practices that can be applied to provide stormwater quantity control include:

wet ponds;

*wet ponds;

dry ponds;

*[[dry ponds]];

infiltration facilities with quantity control component; and,

*infiltration facilities with quantity control component; and,

low impact development practices with quantity control component.

*low impact development practices with quantity control component.

Infiltration facilities and low impact development practices (such as [[bioretention]] and [[rainwater harvesting]]) are typically designed to manage more frequent and lower magnitude rainfall events. However, should these practices be designed for year round functionality, with sufficient flood storage capacity, the volume reductions associated with these practices will only be recognized where the local municipality has endorsed the use of these practices and has considered long term operations and maintenance.

 

Infiltration facilities and low impact development practices (such as bioretention and rainwater harvesting) are typically designed to manage more frequent and lower magnitude rainfall events. However, should these practices be designed for year round functionality, with sufficient flood storage capacity, the volume reductions associated with these practices will only be recognized where the local municipality has endorsed the use of these practices and has considered long term operations and maintenance.

Include a new chapter that provides design guidance for LID practices with quantity control components.

Include a new chapter that provides design guidance for LID practices with quantity control components.