RESTORING THE CONNECTION BETWEEN CREEK AND LAKE: FRESH WATER ESTUARINE CREATION IN MISSISSAUGA Jeff Doucette, Kenneth Dion and Sally-Beth Betts 6 th International Conference on Natural Channel Systems Guelph, ON May 24 th, 2018
Acknowledgments Region of Peel Credit Valley Conservation Toronto and Region Conservation Authority
Presentation Overview Introduction to the Lakeview Waterfront Connection Project Introduction to Serson Creek Freshwater Estuaries Opportunities and Constraints for Serson Creek Design Construction Challenges
Introduction to the Lakeview Waterfront Connection Project
Introduction to the Lakeview Waterfront Connection Project
Introduction to the Lakeview Waterfront Connection Project
Introduction to the Lakeview Waterfront Connection Project Produced by Brook McIlroy
Introduction to the Lakeview Waterfront Connection Project Produced by Brook McIlroy
Introduction to Serson Creek Outlet for Serson Cr
Introduction to Serson Creek
Introduction to Serson Creek
Introduction to Serson Creek
Introduction to Serson Creek
Introduction to Serson Creek
Freshwater Estuaries Semi-enclosed areas of lake shoreline where lake water mixes with water from tributaries of the lake Chemically distinct combinations of river and lake water Mixing is storm driven: Surges Seiching River flow Source: NOAA Ocean Service Education: Freshwater Estuaries (July 6, 2017)
Opportunities and Constraints for Serson Creek Design Design consisted of 4 main components: 1. Stormwater corridor enhancement 2. Estuary Channel 3. Outlet through Shoreline Revetment 4. Connection details between coastal wetlands and estuary channel
Opportunities and Constraints for Serson Creek Design Stormwater corridor opportunities: Widen stormwater corridor Direct base flow and bankfull down the corridor and increased connectivity to the lake Enhance existing aquatic habitat through formalization of a low flow and bankfull channel Create pool-riffle habitat features Stormwater corridor constraints: Widened channel still confined Limited sediment transport from upstream Stabilization will still be required No increase in flood potential
Opportunities and Constraints for Serson Creek Design Estuary channel design opportunities: Re-connect watercourse to the lake increasing fish passage potential Create fresh water estuary Create wetlands Link wetlands to the lake Carp control gate for fish access to wetlands in Cells 1 and 2, and water level control Control overtopping into wetlands Estuary channel design was guided by the following criteria: Match existing grades Lake level controls tie-in location No increases in upstream flood levels Narrow width to maximize space for leveed wetland
Opportunities and Constraints for Serson Creek Design Outlet design was guided by the following criteria: Linkage at low water levels to fish gate at the levees Compatibility with the shoreline revetment design Levee overtopping must be above the 10-yr flow event Flushing events to clear the outlet of accumulated sediment and woody debris must be possible Pedestrian bridge crossing Access for fishing Low flow channel must be possible at low lake levels
Opportunities and Constraints for Serson Creek Design Shoals and pools High estuary hooks Rock habitat features Woody features Vegetated rock buttress Levees Connected wetland habitats
Construction Challenges
Construction Challenges
Construction Challenges
Construction Challenges
Construction Challenges
Sixteen Mile Creek
Habitat Art Photography by Annette Seip, December 2017. Cell 1 wetland habitat art.