19 



The recorded flow of the East Poplar River at the International Boun- 

 dary inadvertently fell below the recommended minimum of 0.085 m-^/s 

 on several days. One reason for the shortage was that the Water 

 Survey of Canada and the U.S. Geological Survey have been experiencing 

 problems with developing an accurate low-flow rating at the hydro- 

 metric station. The Water Survey of Canada resealed the weir struc- 

 ture in August 1986 to eliminate a leakage problem and is planning 

 to improve the metering section in 1987 and, subsequently, make 

 additional measurements to aid in rating definition. The Saskatchewan 

 Water Corporation has been asked to review operating procedures 

 towards avoiding similar occurrences in the future. Communication 

 and data exchange procedures between various agencies will also be 

 improved during 1987. 



A hydrograph of flow in the East Poplar River at the International 

 Boundary and the minimum flow as recommended by the IJC is shown in 

 Figure 3. 



.057 m3/( 



Apporilonmant rscommandatlon for mintmum flow 



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 



1986 



Figure 3. Hydrograph of Water Discharge of the East Poplar River at 

 the International Boundary and Recommended Minimum Flow. 



