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{{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.}}</p>
 
{{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.}}</p>
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[[Read more|Definitions]]
 
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{{:Guide Contents}}
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<h4 class="subtitle-black">CONTENTS</h4>
 
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      <div class="navbar navbar-inverse-darker" role="navigation">
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        <ul class="nav navbar-nav">
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          <li class="dropdown" style="margin-top:11px;">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>INTRODUCTION TO THE LOW IMPACT DEVELOPMENT PLANNING AND DESIGN GUIDE</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[About this Document|<strong>About this Document</strong>]]</li>
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              <li>[[Acknowledgements|&nbsp;&nbsp;&nbsp;Acknowledgements]]</li>
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              <li>[[Definition of Low Impact Development|&nbsp;&nbsp;&nbsp;Definition of Low Impact Development]]</li>
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              <li>[[Ontario Stormwater Management Manuals and Guides|<strong>Ontario Stormwater Management Manuals and Guides</strong>]]</li>
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              <li>[[Ontario Legislative Framework Related to Stormwater Management|<strong>Ontario Legislative Framework Related to Stormwater Management</strong>]]</li>
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              <li>[[The Evolution of Stormwater Management in Ontario|<strong>The Evolution of Stormwater Management in Ontario</strong>]]</li>
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              <li>[[Principles of Low Impact Development|<strong>Principles of Low Impact Development</strong>]]</li>
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            </ul>
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          </li>
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        </ul>
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      </div>
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      <div class="navbar navbar-inverse-darker" role="navigation">
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        <ul class="nav navbar-nav">
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          <li class="dropdown" style="margin-top:11px;">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>INTEGRATING STORMWATER MANAGEMENT INTO THE PLANNING PROCESS</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[Overview of Integrating Stormwater Management Into the Planning Process|<strong>Overview of Integrating Stormwater Management Into the Planning Process</strong>]]</li>
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              <li>[[Landscape-based Stormwater Management Planning Process and Team|&nbsp;&nbsp;&nbsp;Landscape-based Stormwater Management Planning Process and Team]]</li>
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              <li>[[Environmental, Land Use and Stormwater Management Planning|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Environmental, Land Use and Stormwater Management Planning</em>]]</li>
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              <li>[[Integrating Stormwater Infrastructure Into the Urban Fabric and the Landscape|<strong>Integrating Stormwater Infrastructure Into the Urban Fabric and the Landscape</strong>]]</li>
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              <li>[[Landscape-based SWM Planning and Design Principles|&nbsp;&nbsp;&nbsp;Landscape-based SWM Planning and Design Principles]]</li>
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              <li>[[Landscape-based stromwater planning in accord with site geologic context|&nbsp;&nbsp;&nbsp;Landscape-based stromwater planning in accord with site geologic context]]</li>
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              <li>[[Landscape-based Stormwater Management Planning at Different Scales|&nbsp;&nbsp;&nbsp;Landscape-based Stormwater Management Planning at Different Scales]]</li>
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              <li>[[Stormwater Management Opportunities at the Community Scale|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Stormwater Management Opportunities at the Community Scale</em>]]</li>
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              <li>[[Stormwater Management Opportunities at the Neighbourhood Scale|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Stormwater Management Opportunities at the Neighbourhood Scale</em>]]</li>
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              <li>[[Stormwater Management Opportunities at the Site Scale|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Stormwater Management Opportunities at the Site Scale</em>]]</li>
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              <li>[[Stormwater Management Opportunities for Infill and Redevelopment Sites|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Stormwater Management Opportunities for Infill and Redevelopment Sites</em>]]</li>
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              <li>[[Treatment Train Approach to Stormwater Management System Design|<strong>Treatment Train Approach to Stormwater Management System Design</strong>]]</li>
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              <li>[[Influence of Stormwater Source Area on Treatment Train Design|<strong>Influence of Stormwater Source Area on Treatment Train Design</strong>]]</li>
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            </ul>
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          </li>
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        </ul>
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      </div>
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      <div class="navbar navbar-inverse-darker" role="navigation">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>URBANIZATION, CLIMATE CHANGE AND THE LOW IMPACT DEVELOPMENT APRROACH</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[Principles of Low Impact Development|<strong>Principles of Low Impact Development</strong>]]</li>
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              <li>[[The Impact of Urbanization and CC and how Low Impact Development can Help|<strong>The Impact of Urbanization and CC and how Low Impact Development can Help ( Interdisciplinary section)</strong>]]</li>
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              <li>[[Flooding and Stream Flows|&nbsp;&nbsp;&nbsp;Flooding and Stream Flows]]</li>
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              <li>[[Environmental Flows|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>Environmental Flows</em>]]</li>
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              <li>[[Erosion and Sedimentation (Geomorphology)|&nbsp;&nbsp;&nbsp;Erosion and Sedimentation (Geomorphology)]]</li>
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              <li>[[Surface and Groundwater Water Quality|&nbsp;&nbsp;&nbsp;Surface and Groundwater Water Quality]]</li>
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              <li>[[Aquatic Habitats (incl. thermal impacts)|&nbsp;&nbsp;&nbsp;Aquatic Habitats (incl. thermal impacts)]]</li>
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              <li>[[Terrestrial|&nbsp;&nbsp;&nbsp;Terrestrial]]</li>
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              <li>[[Hydrogeology|&nbsp;&nbsp;&nbsp;Hydrodeology]]</li>
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              <li>[[Climate Change|&nbsp;&nbsp;&nbsp;Climate Change]]</li>
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              <li>[[Landscape and Recreation|&nbsp;&nbsp;&nbsp;Landscape and Recreation]]</li>
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              <li>[[Climate Change Resiliency through Stormwater Management|<strong>Climate Change Resiliency through Stormwater Management</strong>]]</li>
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              <li>[[Climate Change in Ontario|&nbsp;&nbsp;&nbsp;Climate Change in Ontario]]</li>
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              <li>[[Anticipated Impacts of Climate Change in Ontario|&nbsp;&nbsp;&nbsp;Anticipated Impacts of Climate Change in Ontario]]</li>
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              <li>[[Enhancing Climate Change Resiliency With LID|&nbsp;&nbsp;&nbsp;Enhancing Climate Change Resiliency With LID]]</li>
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              <li>[[Examples of LID Strategies to Enhance Climate Change Resiliency|&nbsp;&nbsp;&nbsp;Examples of LID Strategies to Enhance Climate Change Resiliency]]</li>
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              <li>[[Factoring Predicted Climate Change into Stormwater Infrastructure Design|&nbsp;&nbsp;&nbsp;Factoring Predicted Climate Change into Stormwater Infrastructure Design]]</li>
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              <li>[[Low Impact Development Site Design Strategies|<strong>Low Impact Development Site Design Strategies</strong>]]</li>
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              <li>[[Adapting Structural Low Impact Development Practices for Ontario|<strong>Adapting Structural Low Impact Development Practices for Ontario</strong>]]</li>
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              <li>[[Cold Climates|&nbsp;&nbsp;&nbsp;Cold Climates]]</li>
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              <li>[[Low permeability soils|&nbsp;&nbsp;&nbsp;Low permeability soils]]</li>
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              <li>[[High density development|&nbsp;&nbsp;&nbsp;High density development]]</li>
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              <li>[[The Low Impact Development Design Process|<strong>The Low Impact Development Design Process (Screening Section)</strong>]]</li>
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              <li>[[Design Principles for Flood Control|&nbsp;&nbsp;&nbsp;Design Principles for Flood Control]]</li>
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              <li>[[Design Principles for Nutrient Management|&nbsp;&nbsp;&nbsp;Design Principles for Nutrient Management]]</li>
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              <li>[[Modelling Treatment Train|&nbsp;&nbsp;&nbsp;Modelling Treatment Train]]</li>
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              <li>[[Costs and Benefits of Low Impact Development Approaches|<strong>Costs and Benefits of Low Impact Development Approaches</strong>]]</li>
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            </ul>
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          </li>
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        </ul>
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      </div>
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      <div class="navbar navbar-inverse-darker" role="navigation">
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        <ul class="nav navbar-nav">
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          <li class="dropdown" style="margin-top:11px;">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>DESIGN OF STRUCTURAL LOW IMPACT DEVELOPMENT PRACTICES FOR STORMWATER MANAGEMENT</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[Service One]]</li>
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              <li>[[Service Three]]</li>
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              <li>[[Service Four]]</li>
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              <li>[[Service Five]]</li>
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              <li>[[Another Service]]</li>
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            </ul>
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          </li>
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        </ul>
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      </div>
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      <div class="navbar navbar-inverse-darker" role="navigation">
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        <ul class="nav navbar-nav">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>MONITORING OF STORMWATER MANAGEMENT PRACTICES</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[Monitoring|<strong>Monitoring</strong>]]</li>
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              <li>[[Compliance Monitoring|&nbsp;&nbsp;&nbsp;Compliance Monitoring]]</li>
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              <li>[[Performance Monitoring|&nbsp;&nbsp;&nbsp;Performance Monitoring]]</li>
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              <li>[[Environmental Effects Monitoring|&nbsp;&nbsp;&nbsp;Environmental Effects Monitoring]]</li>
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            </ul>
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          </li>
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        </ul>
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      </div>
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      <div class="navbar navbar-inverse-darker" role="navigation">
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          <li class="dropdown" style="margin-top:11px;">
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            <span class="dropdown-toggle mwbs-color-white" data-toggle="dropdown"><i class="fa fa-bars"></i><strong>TOOLS</strong></span>
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            <ul class="dropdown-menu darker-color">
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              <li>[[Life Cycle Costing Tool|<strong>Life Cycle Costing Tool</strong>]]</li>
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              <li>[[Planting Guide Tool|<strong>Planting Guide Tool</strong>]]</li>
 +
            </ul>
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          </li>
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        </ul>
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      </div>
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Revision as of 15:11, 30 March 2017


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

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.

Definitions

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CONTENTS

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HOT TOPICS

<h4Blue>Common concerns about groundwater interaction</h4Blue>

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<h4Blue>Infiltration on tight soils: it's possible!</h4Blue>

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<h4Blue>Water-loving perennials</h4Blue>

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<h4Blue>Budgeting for a BMP's life cycle</h4Blue>

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<h4Blue>Tendering for LIDs</h4Blue>

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<h4Blue>Maintaining BMPs</h4Blue>

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BEST MANAGEMENT PRACTICES

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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.

Best management practice. State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include: source, conveyance and end-of-pipe controls.

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