Changes

[[File:Screeningprocessdiagram.png|thumb|700 px|Process Diagram for Screening LID Options]]

[[File:Screeningprocessdiagram.png|thumb|700 px|Process Diagram for Screening LID Options]]

The guidance found on this page is not intended be prohibitive of LID options, but rather to help reduce the number of LID options in the preliminary phases of design and alert the designer to LID opportunities unique to the site being assessed. When going through the process of screening LID options, it is important to have a larger contextual understanding of [[Integrated water management]], [[Site design strategies]], [[Siting and layout of development]], and [[Link title]].

This guidance article intents to help reduce the number of LID options in the preliminary phases of design and alert the designer to LID opportunities unique to the site being assessed. When going through the process of screening LID options, it is important to have a larger contextual understanding of [[Integrated water management]], [[Site design strategies]], [[Siting and layout of development]], and [[Link title]].

== Site Conditions ==

== Site Conditions ==

Complete definition of pre-development site conditions is essential prior to screening of potential stormwater BMPs. The designer should prepare maps describing site conditions to ensure that all environmental features and functions that need consideration in accordance with provincial, municipal and conservation authority development regulations are identified. This includes watercourses and small drainage features, floodplains, important recharge areas, steep slopes, wetlands, natural heritage conservation areas and significant wildlife habitats. In addition, information regarding native soil types, infiltration capacity and depth to water table must be determined.

Complete definition of pre-development site conditions is essential prior to screening of potential stormwater BMPs. The designer should prepare maps describing site conditions and identifying all environmental features and functions that need consideration in accordance with provincial, municipal and conservation authority development regulations. This includes watercourses and small drainage features, floodplains, important recharge areas, steep slopes, wetlands, natural heritage conservation areas and significant wildlife habitats. In addition, information regarding native soil types, infiltration capacity and depth to water table must be determined.

In retrofit scenarios, site conditions will vary and can be explicit with land use type such as road right of ways, parks, residential, industrial, commercial and/or institutional should be noted.

In retrofit scenarios, site conditions will vary and maps can be explicit with land use type. Road right of ways, parks, residential, industrial, commercial and/or institutional should be noted.

For additional information on site conditions to note for:

For additional information on site conditions to note for:

== Define design criteria ==

== Define design criteria ==

Criteria should have requirements to:

Design criteria should be required to:

* Preserve groundwater and baseflow characteristics;

* Preserve groundwater and baseflow characteristics

* Prevent undesirable and costly geomorphic changes in the watercourse;

* Prevent undesirable and costly geomorphic changes in the watercourse

* Prevent any increases in flood risk potential;

* Prevent any increases in flood risk potential

* Protect water quality; and ultimately,

* Protect water quality

* Maintain an appropriate diversity of aquatic life and opportunities for human uses

* Maintain an appropriate diversity of aquatic life and opportunities for human uses

The design criteria required to protect, enhance or restore the environmental resources can be grouped under the following five categories.

The design criteria required to protect, enhance or restore the environmental resources can be grouped under the following five categories.

* Flood protection;

* Flood protection

* Water quality;

* Water quality

* Erosion control;

* Erosion control

* Groundwater recharge; and

* Groundwater recharge

* Natural heritage systems or [[green infrastructure]]

* Natural heritage systems or [[green infrastructure]]

===LID opportunities and land use types===

===LID opportunities and land use types===

If working in a retrofit scenarios, land use type in particular will have various constraints to work with. Road ROWs, residential, industrial, commercial, institutional, and park lands all have unique site constraints and corresponding LID opportunities. To help understand these unique land type constraint and potential LID options, see

If working in a retrofit scenarios, each particular land use type has a different set of constraints on LID options. Road ROWs, residential, industrial, commercial, institutional, and park lands all have unique site constraints and corresponding LID opportunities. To help understand these unique land type constraint and potential LID options, see

*[[LID opportunities and road types]]

*[[LID opportunities and road types]]

===Performance requirements===

===Performance requirements===

Performance of LID within Ontario can be found at [http://www.sustainabletechnologies.ca/wp/home/urban-runoff-green-infrastructure/low-impact-development/ Sustainable Technologies Evaluation Program (STEP)] and [http://www.creditvalleyca.ca/low-impact-development/lid-maintenance-monitoring/lid-monitoring-sites/ Credit Valley Conservation's LID Monitoring program]. To garner a global perspective of LID performance across various geographical regions, check out the [http://www.bmpdatabase.org/index.htm International Stormwater BMP Database], performance data can be downloaded or uploaded and statistical analysis tools are provided.

Resources for evaluating LID practices within Ontario can be found at [http://www.sustainabletechnologies.ca/wp/home/urban-runoff-green-infrastructure/low-impact-development/ Sustainable Technologies Evaluation Program (STEP)] and [http://www.creditvalleyca.ca/low-impact-development/lid-maintenance-monitoring/lid-monitoring-sites/ Credit Valley Conservation's LID Monitoring program]. For a global perspective on LID performance across various geographical regions, check out the [http://www.bmpdatabase.org/index.htm International Stormwater BMP Database]. Performance data can be downloaded or uploaded and statistical analysis tools are provided.

=== Operations and maintenance requirements ===

=== Operations and maintenance requirements ===

[http://www.sustainabletechnologies.ca/wp/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/ LID Inspection and Maintenance Guide] is intended to assist municipalities and industrial/commercial/institutional (ICI) property managers with developing their capacity to integrate LID BMPs into their stormwater infrastructure programs. Part 1 of the document provides guidance on designing an effective LID BMP inspection and maintenance program, based on experiences and advice from leading jurisdictions in the United States, adapted to an Ontario context. Part 2 of the document establishes standard cold climate protocols for inspection, testing and maintenance of seven types of structural LID BMPs.

The [http://www.sustainabletechnologies.ca/wp/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/ LID Inspection and Maintenance Guide] is intended to assist municipalities and industrial/commercial/institutional (ICI) property managers with developing their capacity to integrate LID BMPs into their stormwater infrastructure programs. Part 1 of the document provides guidance on designing an effective LID BMP inspection and maintenance program, based on experiences and advice from leading jurisdictions in the United States, adapted to an Ontario context. Part 2 of the document establishes standard cold climate protocols for inspection, testing and maintenance of seven types of structural LID BMPs.

=== Life cycle costing===

=== Life cycle costing===