Water Supply Outlook for Alberta
May 2017
| Water Supply Forecast as of May 1, 2017 - Oldman River Basin
(Natural Flows) |
| Volume Forecast for May 1 to September 30, 2017 | 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-April 2017 Volume as a % of Average | Ranking (lowest to highest) | |
| St. Mary River | 704,000** | 118 | 108-135 | 98 | 66/99 | 192*** | 94/99 | |
| Belly River | 245,000* | 118 | 108-130 | 100 | 71/99 | 145*** | 91/99 | |
| Waterton River | 581,000* | 118 | 108-128 | 99 | 63/99 | 118*** | 66/99 | |
| Oldman River near Brocket | 1,077,000* | 124 | 112-151 | 101 | 66/99 | 163*** | 87/99 | |
| Oldman River at Lethbridge | 3,149,000* | 126 | 113-139 | 101 | 72/99 | 155*** | 81/99 | |
|
*NOTE: The forecast shown is the March to September 2017 forecast minus the recorded volume to date ** - This value is the natural volume and includes the U.S. share*** - Recorded 2017 natural volumes are preliminary and subject to change Average is calculated for the March 1 to September 30 period 1981 to 2009 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. |
For technical enquires about this web page please contact Alberta Environment - Environmental Management Water Management Operations Branch at AENV-WebWS@gov.ab.ca
