32 



3.4 Cookson Reservoir 



3.4.1 Storage 



On January 1, 2000, Cookson Reservoir storage was 37,920 dam^ or 85% of the full supply volume. 

 The 2000 maximum, minimum, and period elevations and volumes are shown in Table 3.4. 



Inflows into the reservoir were minimal in 2000. A release was initiated in May to meet the 

 recommended Poplar River basin demand release for the 1999-2000 apportionment year. No releases 

 were required to maintain the recommended apportionment target flow at the International Boundary for 

 the remainder of the year. ' 



In addition to runoff, reservoir levels were augmented by ground-water pumping. Wells in the 

 abandoned west block mine site supplied 4,907 dam"' to Girard Creek. It is estimated that less than 70% 

 of this flow volume reached Cookson Reservoir. Wells in the soil salinity project area supplied 676 

 dam^. 



Table 3.4 Cookson Reservoir Storage Statistics for 2000 



