Drawings

Overview

Whilst we consider preparing our own set of STEP LID drawings, we are providing a quick reference list to drawing files from other Ontario and/or Canada-based sources.

If you want help in finding example details for an LID design, please email the Wiki Guide email account or use the comment box below.

You know that typical drawings are no substitute for properly configured design!

Ontario Municipal References

• The City of Toronto Green Streets program included production of many drawn 'typicals'. See example of curb extensions to the right.
• The City of Kitchener has standard details for pervious concrete pavement, precast permeable interlocking pavement and permeable pipe exfiltration systems, a note - you will have to send them an email requesting access to their development manual.
• The City of Barrie has a draft standard detail for an exfiltration trench and soakaway pit in Appendix A - Figures of the linked website. Note that the 'within-WHPA' detail is not supported by STEP.

Exfiltration Systems

Please see below a Profile view of an exfiltration system (or perforated pipe system) designed for use in the city of Barrie and used in conjunction with a typical storm sewer system. Note: This cross section installment is 'not located within a WHPA', although the source document for this drawing showcases a similar design configuration, that is 'located within a WHPA', which is not supported by STEP.

Drawings are from the City of Barrie's, Drainage Master Plan document. For further details about these cross section drawings please visit the link.

Infiltration Trenches/Chambers & Soakaways

Please see below a profile and plan view of an infiltration trench/gallery designed to treat and temporarily store stormwater below ground in shallow geotextile-lined excavations filled with clear stone for use in the City of Toronto under a permeable paver parking lot installation. This drawing depicts partial exfiltration where remaining stormwater runoff is directed to the nearby storm sewer system.

Drawings are from the City of Toronto's, Design Criteria for Green Infrastructure in the Right-of-Way document. For further details about these cross section drawings please visit the link.

Stormwater Tree Trenches

Please see below a Plan and Profile view of one of several variations of a stormwater planter (soil cell) along a roadway. This type of cross section installment showcases a tree trench in a continuous growing medium located under a hard boulevard/concrete surface that can withstand constant and heavy vehicular loads. Drawings are from the City of Toronto's Green Streets Technical Guidelines Appendices document. For further details about these cross section drawings please visit the link.

External Drawing Cross Sections

• Oregon State University LID typicals by GreenGirl
• Plan drawings by Low Impact Development Center, Inc.
• Bioretention detail by Philly Water
• Permeable paving by Philly Water
• Pipe-in-stone infiltration by Philly Water

Proprietary

In our effort to make this guide as functional as possible, we have decided to include proprietary systems and links to manufacturers websites.
Inclusion of such links does not constitute endorsement by the Sustainable Technologies Evaluation Program.
Lists are ordered alphabetically; link updates are welcomed using the form below.

• ADS pipe
• Soil cells by Silvacell
• pretreatment by Hydro International

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Sustainable Technologies Evaluation Program

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.

The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil.

Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).

The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil.

Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).

Filter fabric that is installed to separate dissimilar soils and provide runoff filtration and contaminant removal benefits while maintaining a suitable rate of flow; may be used to prevent fine-textured soil from entering a coarse granular bed, or to prevent coarse granular from being compressed into underlying finer-textured soils.

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.

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

A shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades.

Linear bioretention cell designed to convey, treat and attenuate stormwater runoff. The engineered filter media soil mixture and vegetation slows the runoff water to allow sedimentation, filtration through the root zone, evapotranspiration, and infiltration into the underlying native soil.

A vegetated practice that collects and treats stormwater through sedimentation and filtration. Contributions to water cycle/water balance are through evapotranspiration only; no infiltration.

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.