Water Supply Outlook for Alberta

February 2012

Water Supply Forecast as of February 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 644,000* 86 81-100 69 25/91 143
Belly River 210,000 86 67-95 59 22/91 146
Waterton River 552,000 91 73-106 64 27/91 144
Oldman River near Brocket 933,000 86 64-96 53 32/91 148
Oldman River at Lethbridge 2,507,000 84 64-98 55 30/91 145

 

* - 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