Runoff volume control targets

Recommended regional 90th percentile volume targets for Ontario

Runoff Volume Control Target (RVC_T)

"The means to achieve the RVC_T includes:
Retention - where the captured volume shall be ultimately infiltrated, evapotranspired or re-used and the specified volume will not later be discharged to sewer networks (with the exception of internal water re-use activities) or surface waters and does not therefore become runoff, and

Volume capture and treatment - Also referred to as `treatment and release`, where the volume capture and treatment directly aims at reducing surface water impairment through treatment of the specified volume, often referred to as a “water quality volume”.

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The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

The amount of stormwater runoff from a given area required to be retained by stormwater management practices to reduce pollutant load to an acceptable level.