Water Supply Outlook for Alberta

March 2012

Water Supply Forecast as of March 1, 2012 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2012
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 2011 Volume as a % of Average
St. Mary River 674,000* 90 82-104 75 35/91 143
Belly River 225,000 92 73-104 66 31/91 146
Waterton River 577,000 95 78-107 66 40/91 144
Oldman River near Brocket 958,000 88 76-97 65 37/91 148
Oldman River at Lethbridge 2,610,000 87 70-100 61 37/91 145

 

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

Average is calculated for the March 1 to September 30 period from 1912 to 2001

 
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