- 13 - 



Streamflow in the Poplar River basin was below normal during 1990. The 

 March to October recorded flow volume of the Poplar River at the Inter- 

 national Boundary was 5,410 cubic decametres (dam 3 ), or 32 percent of the 

 1931-80 mean. 



Reservoir Storag e 



Cookson Reservoir, the source of cooling water for the Poplar River Power 

 Station, was at full-supply level (FSL) for only three short periods in 

 the period 1981-90. By the end of 1990, the contents of the reservoir 

 had dropped to a ten-year low of 23,200 dam 3 , or 53 percent of capacity. 

 Full power plant production requires 18,000 dam 3 of water in the reser- 

 voir. The monthend contents and elevations for Cookson Reservoir for 

 1981-90 are shown in Figure 6. 



754 



749 



-i 1 1 1 1 1 1 r 



j 1 i i_ 



-1 L 



_1 i_ 



51,900 



1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



YEAR 



19.100 



Figure 6. — Monthend contents and elevations for Cookson Reservoir 



