Water Supply Outlook for Alberta

May 2009

Water Supply Forecast as of May 1, 2009 - North Saskatchewan River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2009
Locations Volume in dam3 Volume as a % of Average Probable Range as a % of Average Potential Minimum
as % of
Forecast Ranking (lowest to highest) Actual March-September 2008 Volume as a % of Average
Lake Abraham Inflow 2,000,000 93 87-101 85 10/30* 98
Brazeau Reservoir Inflow 1,154,000 81 70-98 66 12/41** 106
North Saskatchewan River at Edmonton 4,861,000 83 74-99 69 22/91 102


* Lake Abraham is compared to 30 years of data
** Brazeau Reservoir is compared to 41 years of data

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 potential 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