Water Supply Outlook for Alberta

May 2010

Water Supply Forecast as of May 1, 2010 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2010
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 2009 Volume as a % of Average
St. Mary River 620,000* 83 68-98 58 22/91 71
Belly River 215,000 88 75-98 69 27/91 82
Waterton River 520,000 86 70-99 59 26/91 77
Oldman River near Brocket 895,000 82 57-99 53 29/91 65
Oldman River at Lethbridge 2,429,000 81 58-97 50 27/91 67

 

* - 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