41 

 6.2 Water Quality 



Inflow to the reservoir originates from two sources, GIrard Creek and the East Poplar 

 River North. The Girard Creek sampling point is located at the Coronach Reservoir 

 overflow (PFRA dam). This inflow location shows strong seasonal fluctuations with no 

 trends evident in water quality. Normally, water flows by this sample point year round as 

 the majority of the water originates from the supplementary pumpwells described in 

 Chapter 4.0 of this report. 



The reservoir monitoring sites include the Highway No. 36 location and the Cookson 

 Reservoir at Morrison Dam location. Strong seasonal fluctuations are evident for the 

 upstream Highway No. 36 location. Less seasonal variation was observed for the 

 reservoir at the Morrison Dam location due to the large volume of water involved. 



The net effect of little spring runoff over the last several years has been a decrease in 

 reservoir water quality. Figures 6.2 to 6.8 show the decreasing water volume of the 

 reservoir and the increasing concentration of boron, sulphate, sodium, chloride, TDS, 

 manganese, and strontium. The deterioration in water quality will continue unless there 

 is an above average runoff in the spring of 1992. 



