Lake Water Quality 2006 Report - Lakefield Herald

Table of ContentsPresident’s Message ...................................................... 4Executive Summary - 2006 Report...................................... 7Physical overview of the Kawarthas ................................... 7Phosphorus monitoring results.......................................... 7How much phosphorus enters the Kawartha Lakes from sewagetreatment plants?....................................................... 8Phosphorus and the Kawartha Lakes................................... 9How much algae sticks to macrophytes in the Kawartha Lakes? .... 9E.coli bacteria test results ........................................... 10Map of the Kawartha Lakes 2006 Testing Area ...................... 11Physical Overview of the Kawartha Lakes ............................. 12Phosphorus Testing ...................................................... 18Three different “phosphorus personalities” .......................... 18Changing as we flow: phosphorus levels vary from lake to lake .... 19The high flow/low phosphorus theory: let’s look again.............. 25How Much Phosphorus Enters the Kawartha Lakes.................... 30from Sewage Treatment Plants?........................................ 30Phosphorus and the Kawartha Lakes: .................................. 34Chapter 2: Watershed land classification and delineation.......... 34Chapter 3: Phosphorus loading potential ............................. 36Chapter 4: Land class and lake morphology correlations withphosphorus.............................................................. 39Chapter 5: Past and present phosphorus levels in the KawarthaLakes.................................................................... 40Chapter 6: Conclusions ................................................ 42How Much Algae Sticks to Macrophytes in the Kawartha Lakes? ... 45Bacteria Testing ......................................................... 52What we did ........................................................... 52What we found......................................................... 52The Mississagua River Diversion of the 1800’s: Water qualityimplications today for the Bald, Pigeon and Buckhorn Lakes ......... 542