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→Pretreatment Features
{| class="wikitable" style="width: 1275px;"
|+'''Types of Stormwater Source Areas, Runoff Characteristics & Opportunities for Treatment'''
|-
!<br>'''Stormwater Source Area'''
!<br>'''Runoff Characteristics'''
!<br>'''Opportunities'''
!<br>'''Principles'''
|-
|Foundation drains, slab [[underdrains]], road or parking lot [[underdrains]]
|
Relatively cool, clean water
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Suitable for [[infiltration]] or direct discharge to receiving watercourses in the area
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Should not be directed to stormwater management facility that receives road or parking lot runoff, so as not to mix relatively clean and contaminated runoff waters
|-
|Roof drains, roof terrace area drains, [[overflow]] from green roofs
|
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.
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*Infiltration ([[Grass Swales]], [[Bioswales]], [[Green Roofs]], [[Bioretention]], [[Permeable Pavement]], etc.);
*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;
*Attenuation and treatment in [[wet pond|SWM ponds]] or [[wetland]] detention facility.
|
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.
|-
|'''How deep is the intake and how far is it located from shore?'''
|
Deep, far
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Intermediate
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Shallow, nearshore
|-
|'''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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Low vulnerability setting
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Moderate vulnerability setting
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High vulnerability setting
|-
|'''How sensitive is the population?'''
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Healthy adults only
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Typical family or mixed range of ages
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Vulnerable populations like the elderly, youth or infants
|-
|'''How many people does the system serve?'''
|
A few
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Some
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Many
|-
|'''How often is the system used?'''
|
Occasionally
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Seasonally or part time (work hours)
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Every day and/or is the only source nearby
|-
|'''What types of activities are located nearby?'''
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Residential
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Agricultural
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Industrial or Commercial
|-
|'''Any water quality issues? (i.e. algal booms or a boil water advisories, etc.)?'''
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Confirmed none
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Possible or Unknown
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Confirmed and Present
|-
|'''Are you located in an area where there is pressure for growth? Or are there other water supply and demand issues?'''
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No
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Maybe / Unknown
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Yes
|-
|'''Is there oversight of the well(s) or intake(s)? For example, licencing, inspections, testing, compliance, and qualified operators.'''
|
Yes
|
Some
|
None
|}