TABLE OF CONTENTS 



Highlights for 1991 vii 



1 .0 Introduction 1 



2.0 Poplar River Power Station 4 



2.1 Operations 4 



2.2 Construction 5 



2.3 Unusual Events 7 



2.4 LIFAC 7 



2.5 Scribner Dam 8 



3.0 East Poplar River 10 



3.1 Streamflow 10 



3.2 Apportionment 10 



3.3 Minimum Flows 11 



3.4 On-Demand Release 12 



3.5 Water Quality 13 



3.5.1 Total Dissolved Solids 14 



3.5.2 Boron 18 



3.5.3 Other Water Quality Variables 21 



3.6 Quality Control 23 



3.6.1 Streamflow 23 



3.6.2 Water Quality 23 



4.0 Supplementary Water Supply (Old Coal Mine Dewatering) 25 



4.1 Operations 25 



4.2 Pumpage Volumes 25 



4.3 Groundwater Levels 26 



4.3.1 Saskatchewan 26 



4.3.2 Montana 28 



4.4 Groundwater Quality 29 



4.4.1 Saskatchewan 29 



4.4.2 Montana 32 



5.0 Soil Salinity Project Below Morrison Dam 33 



5.1 Operations 33 



5.2 Pumpage Volumes 33 



5.3 Groundwater Levels 35 



5.3.1 Saskatchewan 35 



5.3.2 Montana 35 



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