Water Supply Outlook for Alberta

May 2012

Water Supply Forecast as of May 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 714,000* 96 87-105 82 43/91 143
Belly River 229,000 94 84-104 80 34/91 146
Waterton River 651,000 107 95-114 89 58/91 144
Oldman River near Brocket 1,225,000 112 89-129 76 61/91 148
Oldman River at Lethbridge 3,023,000 101 81-115 73 51/91 145

 

* - 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