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GROUND WATER QUANTITY 

 Saskatchewan 



Cookson Reservoir Supplementary Supply 



On January 1, 1990, Sask Power took over responsibility for the network 

 of coal mine dewatering wells south and west of Coronach. Sask Power 

 assumed this responsibility for the purpose of using the network to 

 supplement surface flows into Cookson Reservoir. Previously, this 

 network had been operated and maintained by Prairie Coal for the purpose 

 of dewatering the Hart coal seam to allow mining. 



Most wells were in poor state of repair when taken over by Sask Power. 

 Therefore, during the summer of 1990, approximately 25 wells were 

 repaired and used as pump wells in 1990, with ten discharge points being 

 used. In addition, five piezometers were replaced and five new 

 piezometers were constructed. 



Sask Power informed Saskatchewan Water Corporation that previous dis- 

 charge volume measurements were possibly 30 to 50 percent in error. 

 Saskatchewan Water Corporation and Sask Power were in agreement that this 

 deficiency must be addressed. In order to more accurately determine 

 pumped volumes, flow meters were installed in 1990 to verify flow 

 volumes. Accurate quantification will greatly assist in long term 

 decisions on aquifer yield. 



Table 6 shows that groundwater pumpage from the well network peaked in 

 the early to mid-1980' s followed by continuing decrease in pumping in 

 1986 to 1989. This trend was reversed in 1990 with total abstraction for 



