* 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 con- 

 ditions of this division are as follows: 



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

 cent 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 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 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 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 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. 



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

 Poplar River Basin, Montana-Saskatchewan: Main Report, Interna- 

 tional Souris-Red Rivers Board, Poplar River Task Force, 43 pp. 



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