Water Supply Outlook for Alberta

June 2002

Table 3b - Water Supply Forecast as of June 1, 2002 - Oldman River Basin (Natural Flows)

Volume Forecast for June 1 to September 30 Year to date
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-May 2002 Volume as a % of Average Ranking (lowest to highest)
St. Mary River 553,000** 112 78-133 66 59/84 84*** 26/84
Belly River 147,000* 91 74-124 66 37/84 122*** 72/84
Waterton River 455,000* 109 74-143 68 58/84 82*** 21/84
Oldman River near Brocket 609,000* 95 65-151 57 47/84 85*** 28/84
Oldman River at Lethbridge 1,882,000* 99 65-130 55 48/84 84*** 26/84

*NOTE: The forecast shown is the March to September 2002 forecast minus the recorded volume to date

Click on the site Location to see the Water Supply Forecast graphically

** - This value is the natural volume and includes the U.S. share
*** - Recorded 2002 natural volumes are preliminary and subject to change
Average is calculated for the period 1912 to 1995

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