Water Supply Outlook for Alberta

November 2011

Recorded March 1 to September 30, 2011 Natural Runoff Volumes - Oldman River Basin (Natural Flows)

2011 Recorded Volumes
March 1 to September 30 		2011 Forecast Volumes
Locations Volume in dam3 Volume as a
% of Average 		Ranking (lowest to highest) Average difference between Forecast and Recorded natural volumes
St. Mary River 1,065,000** 143 85/91 29%
Belly River 354,000* 146 88/91 30%
Waterton River 873,000* 144 86/91 34%
Oldman River near Brocket 1,620,000* 148 82/91 22%
Oldman River at Lethbridge 4,338,000* 145 82/91 33%

* - Recorded 2011 natural volumes are preliminary and subject to change
** - This value is the natural volume and includes the U.S. share

Average and rankings are based on the period 1912 to 2001

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