Water Supply Outlook for Alberta

April 2010

Water Supply Forecast as of April 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 601,000* 81 66-98 51 19/91 71
Belly River 196,000 80 68-96 58 19/91 82
Waterton River 496,000 82 64-97 50 23/91 77
Oldman River near Brocket 890,000 82 58-99 51 29/91 65
Oldman River at Lethbridge 2,366,000 79 56-97 47 26/91 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