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 graphs 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.
Caution: Users of the GRCA's real-time data are cautioned to consider the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business.
The Grand River Conservation Authority assumes no responsibility for the correctness of the information contained in this website nor liability to any user of such information, regardless of the purpose.
Warning! River levels and flows can change rapidly.