Water Supply Outlook for Alberta
April 2007
Table 4b - Water Supply Forecast as of April 1, 2007 - Oldman River Basin
(Natural Flows) |
Volume Forecast for April 1 to September 30, 2007 | 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 2007 Volume as a % of Average | Ranking (lowest to highest) | |
St. Mary River | 652,000** | 90 | 74-102 | 62 | 34/91 | 202*** | 82/91 | |
Belly River | 228,000* | 95 | 80-113 | 71 | 39/91 | 201*** | 86/91 | |
Waterton River | 569,000* | 97 | 76-114 | 64 | 43/91 | 197*** | 85/91 | |
Oldman River near Brocket | 979,000* | 93 | 73-123 | 57 | 42/91 | 229*** | 88/91 | |
Oldman River at Lethbridge | 2,661,000* | 93 | 68-114 | 56 | 45/91 | 177*** | 80/91 |
*NOTE: The forecast shown is the March to September 2007 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 2007 natural volumes are preliminary and subject to change Average is calculated for the period 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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