Water Supply Outlook for Alberta

July 2009

Water Supply Forecast as of July 1, 2009 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2009
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 2008 Volume as a % of Average
St. Mary River 516,000* 69 66-80 60 14/91 111
Belly River 186,000 76 72-86 69 14/91 96
Waterton River 423,000 70 66-79 63 16/91 108
Oldman River near Brocket 597,000 55 51-64 50 10/91 97
Oldman River at Lethbridge 1,795,000 60 56-69 53 13/91 102

 

* - 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