Water Supply Outlook for Alberta

February 2007

Table 3 - Water Supply Forecast as of February 1, 2007 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2007
Locations Volume in dam3 Volume as a % of Average Probable Range as a % of Average Reasonable Minimum as % of Average Forecast Ranking (lowest to highest) Recorded March-September 2006 Volume as a % of Average
St. Mary River 696,000* 93 76-113 57 39/91 95
Belly River 231,000 95 78-116 67 36/91 94
Waterton River 565,000 93 73-119 56 38/91 93
Oldman River near Brocket 1,018,000 93 75-122 55 41/91 83
Oldman River at Lethbridge 2,691,000 90 68-114 51 41/91 89

Note: Click on the site Location to see the Water Supply Forecast graphically
 
* - 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 reasonable 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