♦RECOMMENDED FLOW APPORTIONMENT 

 IN THE POPLAR RIVER BASIN 



The aggregate natural flow of all streams and tributaries in the Poplar 

 River Basin crossing the International Boundary shall be divided equally 

 between Canada and the United States subject to the following conditions: 



1. Ihe total natural flow of the West Fork Poplar River and all its 

 tributaries crossing the International Boundary shall be divided 

 equally between Canada and the United States but the flow at the 

 International Boundary in each tributary shall not be depleted 

 by more than 60 percent of its natural flow. 



2. The total natural flow of all remaining streams and tributaries 

 in the Poplar River Basin crossing the International Boundary 

 shall be divided equally between Canada and the United States. 

 Specific conditions of this division are as follows: 



a) Canada shall deliver to the United States a minimum of 60 

 percent of the natural flow of the Middle Fork Poplar River 

 at the International Boundary, as determined below the con- 

 fluence of Goose Creek and Middle Fork. 



b) The delivery of water from Canada to the United States on 

 the East Poplar River shall be determined on or about the 

 first day of June of each year as follows: 



i) When the total natural flow of the Middle Fork Poplar 

 River, as determined below the confluence of Goose Creek, 

 during the immediately preceding March 1st to May 31st 

 period does not exceed 4,690 cubic decametres (3,800 

 acre-feet), then a continuous minimum flow of 0.028 

 cubic metres per second (1.0 cubic feet per second) 

 shall be delivered to the United States on the East 

 Poplar River at the International Boundary throughout 

 the suceeding 12 month period commencing June 1st. In 

 addition, a volume of 3 70 cubic decametres (300 acre-feet) 

 shall be delivered to the United States upon demand at 

 any time during the 12 month period commencing June 1st. 



ii) When the total natural flow of the Middle Fork Poplar 

 River, as determined below the confluence of Goose Creek, 

 during the immediately preceding March 1st to May 31st 

 period is greater than 4,690 cubic decametres (3,800 

 acre-feet), but does not exceed 9,250 cubic decametres 

 7,500 acre-feet), then a continuous minimum flow of 0.057 



*Canada-United States, 1976, Joint studies for flow apportionment. Poplar 

 River Basin, Montana-Saskatchewan: Main Report, International Souris-Red 

 Rivers Board, Poplar River Task Force, 43 pp. 



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