Apportionable flows are calculated at Middle Creek near the Alberta-Saskatchewan Border (station 11AB009)

The black bar shows the amount of apportionable flows that were required to be delivered by Alberta to Saskatchewan.  The white bar shows the flow surplus amounts that were delivered in excess of required flows.  The red bar indicates amounts of required flows that were not delivered (i.e., deficits).  The combined area indicates recorded flow as the amounts of flow deficits are subtracted from the provincial share.  The required provincial share is the combined area of the black and red bars. On the y-axis, the number following the "e" in the Scientific Notation shows how many zeros should be placed to the right of the decimal place.

Under the principle of equitable sharing in the Master Agreement on Apportionment, Saskatchewan's share of apportionable flows of Middle Creek is 75% to enable the use of the waters by Saskatchewan and still fulfill Canada's committments to deliver 50% of the Milk River into the USA. Middle Creek feeds into the Milk River in Saskatchewan.

Alberta has met their delivery requirement throughout the data record, except for five years (1988, 1989, 1998, 2000 and 2008) which had deficits in delivery. The Board representatives of Alberta and Saskatchewan engaged in discussions on how to avoid these deficits, and managed to resolve the issues before conflicts developed. Middle and Lodge Creeks are the only rivers that the Prairie Provinces Water Board that has ever had any deficits.

You can copy and paste flow data presented below into a spreadsheet or word processing file. You can also download a MS Excel file from the right side bar.