.........................................................................................................................................! Introduction....................................................................................................................................! Purpose and scope.............................................................................................................2 Study area.........................................................................................................................2 Location ................................................................................................................2 Geology and soils..................................................................................................2 Land use ...............................................................................................................4 Historical water quality.......................................................................................4 Methodology ......................................................................................................................5 Data collection......................................................................................................5 Analytical methods ..............................................................................................7 Calculation of reservoir storage ..........................................................................8 Acknowledgments............................................................................................................^ Areal variation in water quality, Sepbemter 1990.......................................................................8 Seasonal variation in water quality, September 1990 to September 1991.................................9 Physical properties............................................................................................................9 Chemical constituents.....................................................................................................10 Nutrients ............................................................................................................10 Herbicides...........................................................................................................20 Biological constituents....................................................................................................24 Water-quality stratification............................................................................................30 Summary and conclusions...........................................................................................................34 References..................................................................................................................................... 35