Water Supply Outlook for Alberta

March 2007

Bow River Basin - Water Supply Forecasts

As of March 1, 2007, natural runoff volumes for the March to September 2007 period are forecast to range from average to above average in the Bow River basin. Natural runoff volumes are expected to be average at Banff and the Elbow and Highwood Rivers, and average to slightly above average for Calgary, the Kananaskis River and the Spray Lakes and Cascade Reservoirs (Table 5). Current natural runoff volume forecasts range from 93 to 108% of average in the basin, similar to or slightly higher than the February 1 forecasts. The current forecasted volume for the Bow River at Calgary would rank 52nd lowest in 91-years of record (1912-2001). The March to September 2007 forecast volumes are 13 to 22% higher than those recorded during the same period last year, but 5% higher for the Spray River and 31% higher for Lake Minnewanka.

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