Water Supply Outlook for Alberta

July 2015

Water Supply Forecast as of July 1, 2015 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2015
Locations Volume in dam3 Volume as a % of Average Probable Range as a % of Average Potential Minimum as % of Average Forecast Ranking (lowest to highest) Recorded March-September 2014 Volume as a % of Average
St. Mary River 575,000* 86 81-90 77 21/99 146
Belly River 208,000 89 86-93 82 26/99 129
Waterton River 472,000 86 82-92 78 22/99 137
Oldman River near Brocket 826,000 84 80-91 76 27/99 155
Oldman River at Lethbridge 2,231,000 79 75-83 71 25/99 147

 

* - This value is the natural volume and includes the U.S. share

Average is calculated for the March 1 to September 30 period from 1981 to 2009

 
NOTE: There is: a 50% chance that the actual natural flow will fall within the probable range given; a 25% chance that the actual flow will be less than the lower bound of the probable range given; and a 10% chance that the actual natural flow will be less than the potential minimum. Actual day to day streamflow conditions may vary throughout the season as a result of the effects of streamflow diversion and reservoir storage.

For technical enquires about this web page please contact Alberta Environment - Environmental Management Water Management Operations Branch at AENV-WebWS@gov.ab.ca