Water Supply Outlook for Alberta

July 2010

Water Supply Forecast as of July 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 831,000* 112 108-121 105 66/91 71
Belly River 247,000 101 95-104 92 48/91 82
Waterton River 593,000 98 95-107 91 46/91 77
Oldman River near Brocket 967,000 89 84-96 82 37/91 65
Oldman River at Lethbridge 2,885,000 97 93-105 89 48/91 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