3.4 Cookson Reservoir 

 3.4.1 Storage 



On January 1, 2005, Cookson Reservoir storage was 38, 420 dam'' or 89 % of the full supply volume. 

 The 2005 maximum, minimum, and period elevations and volumes are shown in Table 3.5. 



Spring inflows into the reservoir were well below normal in 2005. A release was made in May to meet 

 the recommended Poplar River basin demand release for the 2004-2005 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 4,321 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 

 790 dam^n 2005. 



Table 3.5 Cookson Reservoir Storage Statistics for 2005 



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