Water Supply Outlook for Alberta

July 2008

Table 3a - Water Supply Forecast as of July 1, 2008 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2008
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 2007 Volume as a % of Average
St. Mary River 769,000* 103 96-111 93 52/91 n/a**
Belly River 230,000 94 91-104 85 35/91 n/a**
Waterton River 644,000 106 100-116 96 57/91 n/a**
Oldman River near Brocket 1,070,000 98 93-106 90 48/91 n/a**
Oldman River at Lethbridge 2,974,000 99 92-107 88 50/91 n/a**

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
** The recorded March-September 2007 volumes will be published in the next Water Supply Outlook Report.

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