3.4 Cookson Reservoir 



3.4.1 Storage 



On January 1, 2003, Cookson Reservoir storage was 31,320 dam' or 72% of the full supply volume. 

 The 2003 maximum, minimum, and period elevations and volumes are shown in Table 3.5. 



Inflows into the reservoir were near normal in 2003. A release was initiated in May to meet the 

 recommended Poplar River basin demand release for the 2002-2003 apportionment years. 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 4,489 dam' to Girard Creek. It is estimated that approximately 

 70% of this flow volume reached Cookson Reservoir. Wells in the soil salinity project area supplied 

 426daml 



Table 3.5 Cookson Reservoir Storage Statistics for 2003 



30 



