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= Preface =
This document – the Low Impact Development Stormwater Management Planning
and Design Guide – has been developed by Credit Valley Conservation (CVC) and
Toronto and Region Conservation Authority (TRCA) as a tool to help developers,
consultants, municipalities and landowners understand and implement sustainable
stormwater planning and practices in the CVC and TRCA watersheds. The use of
sustainable stormwater planning and practices will help ensure the continued health
of the streams, rivers, lakes, fisheries and terrestrial habitats in our watersheds.
The guide is intended to provide engineers, ecologists and planners with up-to-date
information and direction on landscape-based stormwater management planning and
low impact development stormwater management practices such as rainwater
harvesting, green roofs, bioretention, permeable pavement, soakaways and swales.
The information contained in the guide will help practitioners adopt landscape-based
stormwater management approaches, and will help select, design, construct and
monitor more sustainable stormwater management practices.
This manual is not a stand-alone document. It is intended to augment the Ontario
Ministry of the Environment’s 2003 Stormwater Management Planning and Design
Manual, which provides design criteria for “conventional” end-of-pipe stormwater
management practices such as wet ponds and constructed wetlands. It is also a
companion document to other stormwater related guidance documents prepared by
CVC and TRCA. Amongst others, these include:
'''CVC'''
• Credit River Water Management Guidelines (CRWMG) (2007);
• Credit River Stormwater Management Criteria (currently under development;
will be an appendix to the CRWMG;
• Geomorphic and Meander Belt Guidelines (an appendix to the CRWMG);
• Floodline Mapping Guidelines (an appendix to the CRWMG);
• Environmental Impact Report Terms of Reference (an appendix to the
CRWMG);
• Technical Guidelines for Floodproofing, 1994 (an appendix to the CRWMG);
• Hydrologic/Hydraulic Modeling (an appendix to the CRWMG Guidelines);
• Guidelines for Hydrogeologic Studies (an appendix to the CRWMG);
• Headwater Assessment Guidelines (an appendix to the CRWMG).
'''TRCA'''
• Planning and Development Procedural Manual (2007);
• Stormwater Management Criteria (currently under development);
• Floodplain Management Guideline; and
• Stream Crossing Guidelines.
= Notice =
The contents of this report do not necessarily represent the policies of the supporting agencies. Although
every reasonable effort has been made to ensure the integrity of the report, the supporting agencies do
not make any warranty or representation, expressed or implied, with respect to the accuracy or
completeness of the information contained herein. Mention of trade names or commercial products does
not constitute endorsement or recommendation of those products.
= Acknowledgements =
'''Project Team:'''
• Toronto and Region Conservation Authority
• Credit Valley Conservation Authority
• Sustainable Technologies Evaluation Program
• Aquafor Beech Limited
• Schollen & Company
• Dougan and Associates
• Kidd Consulting
• Center for Watershed Protection
• Chesapeake Stormwater Network
'''Funding support for this document was generously provided by:'''
• Region of Peel
• City of Toronto
• Region of York
• Fisheries and Oceans Canada
• Ontario Ministry of the Environment
• Environment Canada’s Great Lakes Sustainability Fund