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This document – the Low Impact Development Stormwater Management Planning
The guide is intended to provide engineers, ecologists and planners with up-to-dateinformation and direction on landscape-based stormwater management planning andlow impact development stormwater management practices such as rainwaterharvesting, green roofs, bioretention, permeable pavement, soakaways and swales.The information contained in the guide will help practitioners adopt landscape-basedstormwater management approaches, and will help select, design, construct andmonitor more sustainable stormwater management practices.
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= About the Low Impact Development Planning and Design Wiki Guide =
= About the Low Impact Development Planning and Design Wiki Guide =
== About the Wiki Guide Format ==
The updated version of the 2010 LID PD Guide is now in a Wiki Guide format....talk about the use of this guide...benefits, etc. If you have any general comments or suggestions, please contact ____.
The updated version of the 2010 LID PD Guide is now in a Wiki Guide format....talk about the use of this guide...benefits, etc. If you have any general comments or suggestions, please contact ____.
{{TextBox|1=Consult the [//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.}}
{{TextBox|1=Consult the [//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.}}
= Preface =
== About the Contents of this Guide ==
and Design Guide – has been developed by Credit Valley Conservation (CVC) and
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,
Toronto and Region Conservation Authority (TRCA) as a tool to help developers,
consultants, municipalities and landowners understand and implement sustainable
consultants, municipalities and landowners understand and implement more sustainable
stormwater planning and practices in the CVC and TRCA watersheds. The use of
stormwater management planning and design practices in their watersheds. Many
sustainable stormwater planning and practices will help ensure the continued health
jurisdictions have defined the term low impact development. For this document, the
of the streams, rivers, lakes, fisheries and terrestrial habitats in our watersheds.
following definition, adapted from the United States Environmental Protection Agency
(U.S. EPA, 2007) will be used:
{{TextBox|1=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.}}
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
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
Ministry of the Environment’s 2003 Stormwater Management Planning and Design