Water Supply Outlook for Alberta

April 2013

Water Supply Forecast as of April 1, 2013 - Oldman River Basin (Natural Flows)

 Revised April 12, 2013

Volume Forecast for March 1 to September 30, 2013
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 2012 Volume as a % of Average
St. Mary River 606,000* 90 82-105 74 25/99 118
Belly River 226,000 97 89-109 82 38/99 121
Waterton River 582,000 106 95-122 85 47/99 99
Oldman River near Brocket 929,000 94 83-106 72 37/99 120
Oldman River at Lethbridge 2,874,000 102 91-113 81 52/99 109

 

* - This value is the natural volume and includes the U.S. share

Average is calculated for the March 1 to September 30 period from 1981 to 2009

 
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