Water Supply Outlook for Alberta

August 2003

Table 4a Water Supply Forecast as of August 1, 2003 - Bow River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2003
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 2002 Volume as a % of Average
Bow River at Banff 935,000 87 85-92 84 20/85 89
Lake Minnewanka Inflow 189,000 100 97-105 95 45/85 101
Spray River near Banff 326,000 89 87-93 85 28/85 92
Kananaskis River 341,000 82 77-92 75 18/85 117
Bow River at Calgary 2,138,000 88 81-94 77 23/85 95
Elbow River 174,000 79 77-84 76 29/85 113
Highwood River 433,000 68 66-76 66 25/85 109

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

Click here to see the table containing the remaining forecast for the season along with the recorded volume to date

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


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