26 

 3.4 Cookson Reservoir 



3.4.1 Storage 



On January 1, 1992, Cookson Reservoir storage was 23 500 dam'^--54 percent of the full-supply 

 volume. During the year, precipitation was below normal resulting in below normal inflows. The 

 1992 maximum, minimum, and period elevations and volumes are shown in Table 3.4. In addition to 

 runoff, reservoir levels were augmented by ground-water pumpage. Wells in the abandoned west 

 block mine site supplied 5 225 dam"^ to Girard Creek. Approximately 70 percent of this flow volume 

 reached Cookson Reservoir. Wells in the Soil Salinity Project supplied 942 dam^^ directly to the 

 reservoir. 



Table 3.4 Cookson Reservoir Storage Statistics for 1 992. 



The Poplar River Power Station is dependent on water from Cookson Reservoir for cooling. Power 

 plant operation is adversely affected when reservoir levels drop below 749.0 metres. The dead- 

 storage level for cooling water used in the generation process is 745.0 metres. The 1 992 recorded 

 levels and associated operating levels are shown in Figure 3.13. As indicated in Figure 3.13, 1992 

 reservoir levels were well below the ten-year median levels. 



