•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. The 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 

 confluence 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 each year as follows: 



(1) 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 decameters (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 succeeding 12 month period commencing 

 June 1st. In addition, a volume of 370 cubic decameters (300 acre-feet) shall be 

 delivered to the United States upon demand at any time during the 1 2 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 31 St period is greater than 4,690 cubic decameters (3,800 acre-feet), but does 

 not exceed 9,250 cubic decameters (7,500 acre-feet), then a continuous minimum 

 flow of 0.057 cubic metres per second (2.0 cubic feet per second) shall be 

 delivered to the United States on the East Poplar River at the International 

 Boundary during the succeeding period June 1st through August 31st. A minimum 

 delivery of 0.028 cubic metres per second (1 .0 cubic feet per second) shall then be 

 maintained from September 1st through to May 31st of the following year. In 

 addition, a volume of 617 cubic decameters (500 acre-feet) shall be delivered to 

 the United States upon demand at any time during the 12-month period 

 commencing June 1st. 



(iii) 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 31 st period is greater than 9,250 cubic decameters (7,500 ace-feet), but does 



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. 



A3-2 



