Water Supply Outlook for Alberta

June 2015

Water Supply Forecast as of June 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 601,000* 90 84-96 78 24/99 146
Belly River 205,000 88 82-95 75 24/99 129
Waterton River 486,000 89 80-102 73 24/99 137
Oldman River near Brocket 893,000 91 83-111 76 32/99 155
Oldman River at Lethbridge 2,410,000 85 77-94 69 30/99 147

 

* - 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