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The LID SWM Guide provides information and direction to assist engineers, ecologists
and planners with landscape-based stormwater management planning and the
selection, design, construction and monitoring of sustainable stormwater management
practices. The focus of this guide is on guidance regarding the planning and design of
structural low impact development practices for stormwater management.
The practice of managing stormwater is continuing to evolve as the science of
watershed management and understanding of our watersheds grow. Effective
management of stormwater is critical to the continued health of our streams, rivers,
lakes, fisheries and terrestrial habitats. CVC and TRCA believe that an improved
understanding of the municipal and environmental planning process and the
requirements for stormwater management will lead to improvements in management
practices and an increasingly standardized and streamlined approach to addressing
stormwater throughout the CVC and TRCA watersheds.
The LID SWM Guide is intended to augment the Ontario Ministry of the Environment
(OMOE) Stormwater Management Planning and Design Manual (2003). The OMOE
manual provides design criteria for “conventional” end-of-pipe stormwater management
practices such as wet ponds and constructed wetlands but provides only limited
information about lot level and conveyance controls. The OMOE manual does, however,
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
stormwater management practices – is usually required to meet the multiple
objectives of stormwater management, which include maintaining the hydrologic cycle,
protecting water quality, and preventing increased erosion and flooding.
This LID SWM Guide focuses on a number of lot level and conveyance stormwater
management practices that have been used extensively in Europe, the United States,
British Columbia and at demonstration sites in Ontario. These practices have only
recently been considered for broad application in Ontario as part of the treatment train
approach. These low impact development practices include green roofs, bioretention,
permeable pavement, soakaways, perforated pipe systems, enhanced grass swales,
dry swales and rainwater harvesting. The LID SWM Guide recommends and supports
the use of the treatment train approach for stormwater management. Accordingly, the
reader is urged to refer to the OMOE manual (OMOE, 2003), as a guide for
incorporating more traditional practices such as wet ponds and wetlands into the overall
stormwater management planning and design process.
The LID SWM Guide is not intended to limit innovation or restrict the use of creative
solutions for stormwater management. Indeed, the OMOE, CVC, TRCA and partner
municipalities encourage the development of innovative designs and technologies.
= Related Documents =
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

Revision as of 16:45, 15 December 2016

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Welcome to the Low Impact Development Stormwater Management Practice Planning and Design Guide

This website was developed using Mediawiki, a wiki application that allows for easy editing and that has powerful search abilities. See Introduction to the wiki for more information.

The Low Impact Development Stormwater Management Planning and Design Guide (LID SWM 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 more sustainable stormwater management planning and design practices in their watersheds. Many jurisdictions have defined the term low impact development. For this document, the following definition, adapted from the United States Environmental Protection Agency (U.S. EPA, 2007) will be used:

Low impact development (LID) is a stormwater management strategy that seeks to mitigate the impacts of increased runoff and stormwater pollution by managing runoff as close to its source as possible. LID comprises a set of site design strategies that minimize runoff and distributed, small scale structural practices that mimic natural or predevelopment hydrology through the processes of infiltration, evapotranspiration, harvesting, filtration and detention of stormwater. These practices can effectively remove nutrients, pathogens and metals from runoff, and they reduce the volume and intensity of stormwater flows.

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INTRODUCTION TO THE LOW IMPACT DEVELOPMENT PLANNING AND DESIGN GUIDE

INTEGRATING STORMWATER MANAGEMENT INTO THE PLANNING PROCESS

THE LOW IMPACT DEVELOPMENT APPROACH

DESIGN OF STRUCTURAL LOW IMPACT DEVELOPMENT PRACTICES FOR STORMWATER MANAGEMENT

MONITORING

TOOLS

<h4Blue>Introduction to the LID Planning and Design Guide</h4Blue>

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<h4Blue>Integrating Stormwater Management into the Planning Process</h4Blue>

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<h4Blue>The LID Approach</h4Blue>

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<h4Blue>Design of Structural LID Practices for Stormwater Management</h4Blue>

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<h4Blue>Monitoring of LID Practices</h4Blue>

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Recent projects

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Low impact development is a stormwater management and land development strategy applied at the parcel and subdivision scale that emphasizes conservation and use of on-site natural features integrated with engineered, small scale hydrologic controls to more closely mimic pre-development hydrologic functions.

A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Stormwater Management

Credit Valley Conservation

Toronto and Region Conservation Authority

A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

The slow movement of water into or through a soil or drainage system.

Penetration of water through the ground surface.

The quantity of water transpired (given off). Retained in plant tissues, and evaporated from plant tissues and surrounding soil surfaces. Quantitatively it is usually expressed in terms of depth of water per unit area during a specified period. e.g. mm/day

The combined loss of water to the atmosphere from land and water surfaces by evaporation and from plants by transpiration.

The technique of removing pollutants from runoff as it infiltrates through the soil.

The temporary storage of stormwater to control discharge rates, and allow for sedimentation.

Surface runoff from at-grade surfaces, resulting from rain or snowmelt events.

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