Changes

Certain source areas known as "pollution hot spots" have a higher chance to create contaminated surface level runoff due to given activities occurring and associated contaminant types present on site (i.e. vehicle fueling stations, landfills, certain agricultural practices, manufacturing and construction sites, etc. As a result of this different runoff contamination levels also limit the types of treatment opportunities and practices that can be implemented in varying source water areas. It is important that stormwater management plans be developed with consideration of the different types of runoff source areas that will be present, and recognition of source

Certain source areas known as "pollution hot spots" have a higher chance to create contaminated surface level runoff due to given activities occurring and associated contaminant types present on site (i.e. vehicle fueling stations, landfills, certain agricultural practices, manufacturing and construction sites, etc. As a result of this different runoff contamination levels also limit the types of treatment opportunities and practices that can be implemented in varying source water areas. It is important that stormwater management plans be developed with consideration of the different types of runoff source areas that will be present, and recognition of source

areas with low to moderate contamination potential that represent opportunities for [Rainwater Harvesting], [permeable pavements] and other stormwater infiltration practices. Furthermore, it is vital to ensure that relatively clean runoff is not mixed with lesser quality runoff from surfaces that are subject to higher levels of contamination, rendering it less suitable for infiltration or harvesting.  

areas with low to moderate contamination potential that represent opportunities for [[Rainwater Harvesting]], [[permeable pavements]] and other stormwater infiltration practices. Furthermore, it is vital to ensure that relatively clean runoff is not mixed with lesser quality runoff from surfaces that are subject to higher levels of contamination, rendering it less suitable for infiltration or harvesting.  

These different source areas and associated runoff characteristics can be viewed in the table below:

These different source areas and associated runoff characteristics can be viewed in the table below:

|Roof drains, roof terrace area drains, [[overflow]] from green roofs

|Roof drains, roof terrace area drains, [[overflow]] from green roofs

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Moderately clean water, contaminants may include asphalt granules, low levels of hydrocarbons and [[metals]] from decomposition of roofing materials, animal droppings, natural organic matter and fall out from airborne pollutants, potentially warm water.

Moderately clean water, contaminants may include asphalt granules, low levels of hydrocarbons and [[metals|Heavy metals]] from decomposition of roofing materials, animal droppings, natural organic matter and fall out from airborne pollutants, potentially warm water.

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*Infiltration ([[Grass Swales]], [[Bioswales]], [[Green Roofs]], [[Bioretention]], [[Permeable Pavement]], etc.);

*Infiltration ([[Grass Swales]], [[Bioswales]], [[Green Roofs]], [[Bioretention]], [[Permeable pavements]], etc.);

*Filtration ([[Stormwater Tree Trenches]], [[Soil cells]], [[Stormwater planters]]);

*Filtration ([[Stormwater Tree Trenches]], [[Soil cells]], [[Stormwater planters]]);

*Harvesting with [[rain barrels]] or [[cisterns|Infiltration chambers]] and use for non-potable purposes (e.g., irrigation, toilet flushing) after pretreatment;

*Harvesting with [[rain barrels]] or [[cisterns|Infiltration chambers]] and use for both indoor and outdoor non-potable purposes (e.g., irrigation, toilet flushing) after [[Pretreatment]];

*Attenuation and treatment in [[wet pond|SWM ponds]] or [[wetland]] detention facility.

*Attenuation and treatment in [[wet pond|SWM ponds]] or [[wetland]] detention facility.

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Runoff should be treated with a [[sedimentation and/or filtration practice|pretreatment]] prior to infiltration. Where possible, runoff should not be directed to end-of-pipe facilities to capitalize on potential for infiltration or harvesting. Flow moderation (quantity control) prior to discharge to receiving watercourse is required.

Runoff should be treated with a [[sedimentation and/or filtration practice|Pretreatment]] prior to infiltration. Where possible, runoff should not be directed to end-of-pipe facilities to capitalize on potential for infiltration or harvesting. Flow moderation (quantity control) prior to discharge to receiving watercourse is required.

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|'''How deep is the intake and how far is it located from shore?'''

|Low and medium traffic roads and parking lots, driveways, pedestrian plazas, walkways

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Deep, far

Moderately clean water, contaminants may include low levels of sediment, de-icing salt constituents, hydrocarbons, metals and natural organic matter. Typically warm water.

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*Filtration ([[Stormwater Tree Trenches]], [[Soil cells]], [[Stormwater planters]]);

Shallow, nearshore

*Harvesting with [[cisterns|Infiltration chambers]] or [[Permeable pavement]] reservoirs and use for only outdoor non-potable purposes (e.g., vehicle washing, irrigation) after pretreatment;

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*Attenuation and treatment in [[wet pond|SWM ponds]] or [[wetland]] detention facility.

|'''What is the [https://www.lioapplications.lrc.gov.on.ca/SourceWaterProtection/index.html?viewer=SourceWaterProtection.SWPViewer&locale=en-CA vulnerability] of your area?'''

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Typical family or mixed range of ages

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|'''How often is the system used?'''

|High traffic roads and parking lots

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Seasonally or part time (work hours)

*Attenuation and treatment in [[wet pond|SWM ponds]] or [[wetland]] detention facility;

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Every day and/or is the only source nearby

Runoff should be treated with a sedimentation and/or filtration pretreatment practice prior to infiltration.

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|'''What types of activities are located nearby?'''

|"Pollution hot spots" such as vehicle fueling, servicing or demolition areas, outdoor storage and handling areas for hazardous materials, some heavy industry/construction sites

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Industrial or Commercial

Runoff from these sources should not be infiltrated or used for irrigation. Spill containment or mitigation devices recommended contingent on size of storage facilities.

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