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| The LID SWM Guide provides information and direction to assist engineers, ecologists
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| and planners with landscape-based stormwater management planning and the
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| selection, design, construction and monitoring of sustainable stormwater management
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| practices. The focus of this guide is on guidance regarding the planning and design of
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| structural low impact development practices for stormwater management.
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|
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| The practice of managing stormwater is continuing to evolve as the science of
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| watershed management and understanding of our watersheds grow. Effective
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| management of stormwater is critical to the continued health of our streams, rivers,
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| lakes, fisheries and terrestrial habitats. CVC and TRCA believe that an improved
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| understanding of the municipal and environmental planning process and the
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| requirements for stormwater management will lead to improvements in management
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| practices and an increasingly standardized and streamlined approach to addressing
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| stormwater throughout the CVC and TRCA watersheds.
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|
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| The LID SWM Guide is intended to augment the Ontario Ministry of the Environment
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| (OMOE) Stormwater Management Planning and Design Manual (2003). The OMOE
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| manual provides design criteria for “conventional” end-of-pipe stormwater management
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| practices such as wet ponds and constructed wetlands but provides only limited
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| information about lot level and conveyance controls. The OMOE manual does, however,
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| emphasize the use of a “treatment train” approach to reduce the impacts of stormwater runoff. A treatment train approach – a combination of lot level, conveyance, and end-ofpipe
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| stormwater management practices – is usually required to meet the multiple
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| objectives of stormwater management, which include maintaining the hydrologic cycle,
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| protecting water quality, and preventing increased erosion and flooding.
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|
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| This LID SWM Guide focuses on a number of lot level and conveyance stormwater
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| management practices that have been used extensively in Europe, the United States,
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| British Columbia and at demonstration sites in Ontario. These practices have only
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| recently been considered for broad application in Ontario as part of the treatment train
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| approach. These low impact development practices include green roofs, bioretention,
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| permeable pavement, soakaways, perforated pipe systems, enhanced grass swales,
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| dry swales and rainwater harvesting. The LID SWM Guide recommends and supports
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| the use of the treatment train approach for stormwater management. Accordingly, the
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| reader is urged to refer to the OMOE manual (OMOE, 2003), as a guide for
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| incorporating more traditional practices such as wet ponds and wetlands into the overall
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| stormwater management planning and design process.
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|
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| The LID SWM Guide is not intended to limit innovation or restrict the use of creative
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| solutions for stormwater management. Indeed, the OMOE, CVC, TRCA and partner
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| municipalities encourage the development of innovative designs and technologies.
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|
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| = Related Documents =
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| This manual is not a stand-alone document. It is intended to augment the Ontario
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| Ministry of the Environment’s 2003 Stormwater Management Planning and Design
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| Manual, which provides design criteria for “conventional” end-of-pipe stormwater
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| management practices such as wet ponds and constructed wetlands. It is also a
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| companion document to other stormwater related guidance documents prepared by
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| CVC and TRCA. Amongst others, these include:
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|
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| '''CVC'''
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|
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| • Credit River Water Management Guidelines (CRWMG) (2007);
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|
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| • Credit River Stormwater Management Criteria (currently under development;
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| will be an appendix to the CRWMG;
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|
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| • Geomorphic and Meander Belt Guidelines (an appendix to the CRWMG);
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| • Floodline Mapping Guidelines (an appendix to the CRWMG);
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|
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| • Environmental Impact Report Terms of Reference (an appendix to the
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| CRWMG);
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|
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| • Technical Guidelines for Floodproofing, 1994 (an appendix to the CRWMG);
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|
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| • Hydrologic/Hydraulic Modeling (an appendix to the CRWMG Guidelines);
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|
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| • Guidelines for Hydrogeologic Studies (an appendix to the CRWMG);
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|
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| • Headwater Assessment Guidelines (an appendix to the CRWMG).
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|
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| '''TRCA'''
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|
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| • Planning and Development Procedural Manual (2007);
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|
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| • Stormwater Management Criteria (currently under development);
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|
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| • Floodplain Management Guideline; and
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|
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| • Stream Crossing Guidelines.
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|
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| = Notice =
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| The contents of this report do not necessarily represent the policies of the supporting agencies. Although
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| every reasonable effort has been made to ensure the integrity of the report, the supporting agencies do
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| not make any warranty or representation, expressed or implied, with respect to the accuracy or
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| completeness of the information contained herein. Mention of trade names or commercial products does
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| not constitute endorsement or recommendation of those products.
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|
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| = Acknowledgements =
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| '''Project Team:'''
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|
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| • Toronto and Region Conservation Authority
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|
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| • Credit Valley Conservation Authority
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|
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| • Sustainable Technologies Evaluation Program
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|
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| • Aquafor Beech Limited
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|
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| • Schollen & Company
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|
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| • Dougan and Associates
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|
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| • Kidd Consulting
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|
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| • Center for Watershed Protection
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|
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| • Chesapeake Stormwater Network
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|
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|
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| '''Funding support for this document was generously provided by:'''
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|
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| • Region of Peel
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|
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| • City of Toronto
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|
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| • Region of York
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|
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| • Fisheries and Oceans Canada
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|
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| • Ontario Ministry of the Environment
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|
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| • Environment Canada’s Great Lakes Sustainability Fund
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