Technical Foundation for Future Management of Vancouver Lake

Technical Foundation for Future Management of Vancouver Lake

DRAFT Technical Foundation for Future Management of Vancouver Lake November 2008 Prepared by the Vancouver Lake Watershed Partnership’s Technical Group Contents Contents ..............................................................................................................................................iii Glossary ............................................................................................................................................... v 1. Introduction............................................................................................................................... 1-1 Background ................................................................................................................................ 1-1 Purpose of This Document....................................................................................................... 1-1 Overview of Vancouver Lake .................................................................................................. 1-2 Character of the Lake and the Larger Watershed ....................................................... 1-2 History of Vancouver Lake ............................................................................................ 1-2 Ownership and Surrounding Land Uses ..................................................................... 1-4 2. Hydrology, Vegetation, Fish and Wildlife .......................................................................... 2-1 What Makes Shallow Lakes Different?................................................................................... 2-1 Two States of Shallow Lakes.................................................................................................... 2-1 Hydrology of Vancouver Lake ................................................................................................ 2-2 Columbia River, the Flushing Channel, and Lake River ........................................... 2-2 Burnt Bridge and Salmon Creek.................................................................................... 2-3 Smaller Tributaries .......................................................................................................... 2-4 Groundwater .................................................................................................................... 2-4 Typical Water Year .......................................................................................................... 2-4 Lake Bottom...................................................................................................................... 2-5 Fish, Wildlife, Invertebrates, and Aquatic Vegetation at Vancouver Lake ....................... 2-5 Fish..................................................................................................................................... 2-6 Wildlife.............................................................................................................................. 2-6 Invertebrates..................................................................................................................... 2-6 Aquatic Vegetation.......................................................................................................... 2-6 3. Issues at Vancouver Lake........................................................................................................3-1 Nuisance Algal Blooms............................................................................................................. 3-2 What Is the Concern? ...................................................................................................... 3-2 What Is the Extent at Vancouver Lake?........................................................................ 3-2 What Is the Likely Source? ............................................................................................. 3-3 Excess Nutrients ........................................................................................................................ 3-3 What Is the Concern? ...................................................................................................... 3-3 What Is the Extent at Vancouver Lake?........................................................................ 3-3 What Is the Source? ......................................................................................................... 3-4 Bacteria and Pathogens............................................................................................................. 3-4 What Is the Concern? ...................................................................................................... 3-4 What Is the Extent at Vancouver Lake?........................................................................ 3-4 What Is the Source? ......................................................................................................... 3-4 Temperature and Dissolved Oxygen...................................................................................... 3-5 What Is the Concern? ...................................................................................................... 3-5 What Is the Extent at Vancouver Lake?........................................................................ 3-5 What Is the Source? ......................................................................................................... 3-5 CHAPTER 0 iii CONTENTS Toxic Contaminants .................................................................................................................. 3-5 What Is the Concern? ...................................................................................................... 3-5 What Is the Extent at Vancouver Lake?........................................................................ 3-6 What Is the Source? ......................................................................................................... 3-6 Low Water Clarity..................................................................................................................... 3-7 What Is the Concern? ...................................................................................................... 3-7 What Is the Extent at Vancouver Lake?........................................................................ 3-7 What Is the Source? ......................................................................................................... 3-7 Sedimentation ............................................................................................................................ 3-7 What Is the Concern? ...................................................................................................... 3-7 What Is the Extent at Vancouver Lake?........................................................................ 3-8 What Is the Source? ......................................................................................................... 3-8 Exotic Plant Species................................................................................................................... 3-8 What Is the Concern? ...................................................................................................... 3-8 What Is the Extent at Vancouver Lake?........................................................................ 3-9 What Is the Source? ......................................................................................................... 3-9 Lack of Aquatic Habitat............................................................................................................ 3-9 What Is the Concern? ...................................................................................................... 3-9 What Is the Extent at Vancouver Lake?........................................................................ 3-9 What Is the Source? ......................................................................................................... 3-9 4. Data Gaps................................................................................................................................... 4-1 Technical Questions .................................................................................................................. 4-1 Available Information..................................................................................................... 4-2 Data Gaps.......................................................................................................................... 4-3 Physical Environment (Hydrology/Hydraulics).................................................................. 4-3 Available Information..................................................................................................... 4-4 Data Gaps.......................................................................................................................... 4-5 Available Information..................................................................................................... 4-6 Data Gaps.......................................................................................................................... 4-7 5. Technical Strategy .................................................................................................................... 5-1 Strategy Overview..................................................................................................................... 5-1 Studies........................................................................................................................................

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