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Lake Ontario Shoreline Management Plan

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Lake Ontario Shoreline Management Plan Lake Ontario Shoreline Management Plan DRAFT FINAL Prepared for: Central Lake Ontario Conservation Authority Ganaraska Region Conservation Authority Lower Trent Region Conservation Authority June 10, 2020 Prepared by: Contact the Author: Peter J. Zuzek 905-719-8980 [email protected] March 6, 2014 MODIS Satellite Image of Lake Ontario Disclaimer: Zuzek Inc. prepared this report for the Central Lake Ontario Conservation Authority, Ganaraska Region Conservation Authority, and the Lower Trent Region Conservation Authority. The standard of care typically applied to such an assignment was followed using available data to produce the report. Zuzek Inc. assumes no responsibility for the use of this report by a third party. Furthermore, if used by a third party, they agree that the information is subject to change without notice and Zuzek Inc. assumes no responsibility for the consequences of such use or changes in the information. Under no circumstances will Zuzek Inc. be liable for direct, indirect, special, or incidental damages resulting from, arising out of, or in connection with the use of the information in this report by a third party. EXECUTIVE SUMMARY Zuzek Inc. and SJL Engineering Inc. were retained by the Central Lake Ontario (CLOCA), Ganaraska (GRCA) and Lower Trent Region (LTRCA) Conservation Authorities to develop an updated Shoreline Management Plan (SMP) for their respective Lake Ontario shorelines. The SMP replaces the original SMP for the region, which was prepared in 1990 by Sandwell Swan Wooster (SSW, 1990). The total shoreline length covered by the SMP is approximately 135 km and stretches from Lakeside Neighbourhood Park in Ajax (CLOCA west boundary) to Carrying Place, Quinte West (LTRCA east boundary). The development of the updated SMP was guided by several principles and objectives, as discussed in Section 1.0 of this document. The overarching principle guiding the study is to promote sustainable coastal development in the future through integrated coastal zone management. To accomplish this a sustainable balance must be achieved between environmental, social, economical, cultural and recreational objectives when making management decisions and planning for new development along the shoreline. The key objectives of the SMP are to increase the resilience of coastal communities, protect new development from coastal hazards, update existing hazard mapping using the best available information, incorporate nature-based solutions, protect and enhance existing private and public amenities along the shoreline, and to integrate climate change impacts when considering the coastal hazards of the future. This SMP is also guided by several pieces of legislation including Ontario Regulation 97/04 as developed under the Conservation Authorities Act (1990), pertaining to the regulation of development on hazardous lands. Each conservation authority has their own regulation under the Act addressing development, interference with wetlands and alterations to shorelines and watercourses. The specific documents are Ontario Regulations 42/06 (CLOCA), 168/06 (GRCA) and 163/06 (LTRCA). Guidance is also provided in the Provincial Policy Statement (PPS), issued by the Ministry of Municipal Affairs and Housing (2020). The PPS recognizes that Ontario’s long-term prosperity requires resilient communities supported by long-term strategic development plans, protection of natural resources, and sustainable economic growth. Additional details on the legislation guiding the development of this SMP is provided in Section 2.0. Extensive field investigations and technical work was completed as a component of this study, and is discussed in detail in Section 3.0 and 4.0. This includes the collection of an oblique aerial photo library (captured from a 1020.01 Lake Ontario p.i Shoreline Management Plan drone) and shore protection database for all developed areas within the project. Technical aspects of the previous SMP were updated, including the measurement of shoreline change rates (erosion and accretion), sediment transport trends, and 100-year wave and water level conditions. Using the results of this technical work, the project shoreline was divided into 12 project reaches and updated hazard mapping was produced for each reach including delineation of the erosion hazard, flood hazard, and dynamic beach hazard, where appropriate as per provincial guidelines. The procedure for delineating shoreline hazards is discussed in Section 5.0 of the SMP. Shoreline management recommendations are presented for each project reach based on the delineated shoreline hazards and identified threats to human safety, private and public assets, and the natural environment. Shoreline management recommendations are grouped into the following four broad categories; Avoid, Retreat, Accommodate and Protect. Shoreline management including guidance in the design and implementation of shoreline protection structures is presented in Section 7.0. Summaries of existing shoreline conditions, all technical aspects of the study, shoreline hazards and recommended shoreline management approaches are provided by project reach in a series of Reach Summary Templates which can be found in Appendix A. Shoreline hazard mapping for each of the three Conservation Authorities is found in Appendix B, C and D. Finally, Section 8.0 presents a summary of key conclusions arising from the SMP including broad recommendations for the region. Commentary is also provided on the suggested implementation strategy and next steps. This includes exploring linkages between this SMP and Municipal Official Plans, integrating the information presented herein with other aspects of shoreline management including species protection and habitat creation, and seeking continued partnerships with senior levels of government to pursue common principles and objectives. Ultimately, the success of this SMP meeting the objectives will be influenced by ability of all parties to collaborate and implement the plan. 1020.01 Lake Ontario p.ii Shoreline Management Plan TABLE OF CONTENTS EXECUTIVE SUMMARY 1.0 INTRODUCTION ............................................................................................ 1 1.1 Previous Shoreline Management Plan .......................................................................... 1 1.2 Study Area ................................................................................................................... 2 1.2.1 Conservation Authorities ......................................................................................................................... 2 1.3 Principles and Objectives .............................................................................................. 3 1.4 Report Format and Organization ................................................................................ 3 2.0 LEGISLATION, POLICY AND TECHNICAL DIRECTION ........................ 5 2.1 Conservation Authorities Act ...................................................................................... 5 2.1.1 Ontario Regulations for the CAs.............................................................................................................. 5 2.2 Provincial Policy Statement (Ministry of Municipal Affairs and Housing, 2020) ........ 6 2.3 Technical Direction ...................................................................................................... 7 2.3.1 Technical Guide for Great Lakes – St Lawrence River System (MNR, 2001a) ...................................... 7 2.3.2 Understanding Natural Hazards (MNR, 2001b) ...................................................................................... 7 2.3.3 Guidelines for Developing Schedules of Regulated Areas ...................................................................... 7 3.0 FIELD INVESTIGATIONS AND COASTAL DATA ..................................... 9 3.1 Oblique Aerial Photography ........................................................................................ 9 3.2 Sediment Samples....................................................................................................... 13 3.3 Shoreline Protection Database ................................................................................... 14 3.4 Significant Natural Features ...................................................................................... 16 3.5 Emergency Field Visits in the Spring of 2019 ............................................................. 22 4.0 TECHNICAL ANALYSIS.............................................................................. 24 4.1 Geology and Surficial Sediment ................................................................................. 24 4.2 Water Levels ............................................................................................................... 25 4.2.1 Water Level Regulation ......................................................................................................................... 25 4.2.2 Static Lake Levels .................................................................................................................................. 26 4.2.3 Storm Surge ........................................................................................................................................... 28 4.2.4 Joint Probability ..................................................................................................................................... 30 4.3 Wave Climate ............................................................................................................
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