Water Supply Outlook for Alberta

April 2007

Table 7a - Water Supply Forecast as of April 1, 2007 - North Saskatchewan 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
Forecast Ranking (lowest to highest) Actual March-September 2006 Volume as a % of Average
Lake Abraham Inflow 2,219,000 103 98-110 95 19/30* 101
Brazeau Reservoir Inflow 1,478,000 103 82-129 73 22/41** 63
North Saskatchewan River at Edmonton 5,938,000 101 88-118 76 52/91 76

Note: Click on the site Location to see the Water Supply Forecast graphically

* 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 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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