Water Supply Outlook for Alberta

March 2007

Table 4 - Water Supply Forecast as of March 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 705,000* 95 71-111 63 39/91 95
Belly River 235,000 96 81-116 72 40/91 94
Waterton River 594,000 98 75-116 62 46/91 93
Oldman River near Brocket 1,029,000 94 75-124 58 41/91 83
Oldman River at Lethbridge 2,809,000 94 68-114 55 46/91 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.

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