11 



1.000 



0.000 



MAR 



— MEDIAN OF MONTHLY MEAN DISCHARGE FOR 1 961 -1 990 



— MONTHLY MEAN DISCHARGE FOR 1991 



-4> 



APR 



MAY 



JUN 



JUL 



AUG 



SEP 



OCT 



Figure 3.1 Discharge During 1991 Compared with the l\/ledian Discharge for 

 1961-1990 for the Poplar River at the International Boundary. 



3.3 Minimum Flows 



The recorded volume of the Poplar River at the International Boundary from March 1 to 

 May 31 , 1991 was 2 740 dam^ Based on the IJC recommendations and the assumption 

 that the recorded flow is the natural flow, the United States entitlement is a minimum 

 discharge on the East Poplar River of 0.028 m^/s for the period June 1 , 1 991 to May 31 , 

 1992. The minimum flow for the period January 1 to May 31 , 1991 had previously been 

 determined on the basis of the Poplar River flow volume for March 1 to May 31 , 1990. 

 A hydrograph of the East Poplar River at the International Boundary and the minimum 

 flow as recommended by the IJC are shown in Figure 3.2. All dally flows during 1991 



