Water Supply Outlook for Alberta
April 2007
| Table 4a - Water Supply Forecast as of April 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 | 715,000* | 96 | 80-108 | 69 | 41/91 | 95 |
| Belly River | 239,000 | 98 | 83-116 | 74 | 44/91 | 94 |
| Waterton River | 603,000 | 99 | 80-117 | 68 | 50/91 | 93 |
| Oldman River near Brocket | 1,055,000 | 97 | 77-126 | 62 | 47/91 | 83 |
| Oldman River at Lethbridge | 2,863,000 | 96 | 71-116 | 60 | 48/91 | 89 |
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Note: Click on the site Location to see the Water Supply Forecast graphically
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* - 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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