During the summer and fall, the GRCA releases water from its seven multipurpose reservoirs. This is called flow augmentation. We do it in order to maintain minimum flows in the Grand River system.
During the augmentation season, a graph posted here will show the percentage of river flows coming from the GRCA’s multipurpose reservoirs.
We release water from the reservoirs to maintain target minimum flows at these locations from May to September. Flows are measured in cubic metres per second (m3/s).
The following charts illustrate the flow augmentation at different locations along the Grand River and in the Speed River at the Edinburgh Road gauge.
Please Note: Augmentation charts are updated twice a month from April to November.