Site considerations

Installation type 	Depth to high water or bedrock (m)i 	Ratio of impervious drainage area to permeable facility footprint area	Native soil infiltration rate (mm/hr)ii 	Head (m)iii	Space %iv	Slope %v	Applicable in pollution hotspotsvi 	Set backs 	Karstvii 	Drinking Water Source Protection wellhead protection area time of travel
Rain barrels 	Not a constraint 	Not applicable 	Not a constraint 	1 	0 	NA 	Yes 	None 	Yes 	None
Cisterns 	Not a constraint 	Not applicable 	Not a constraint 	0 	0 	0 	Yes 	None 	Yes 	None
Roof downspout disconnection 	Not a constraint 	4:1 or less 	Decompaction if < 15 mm/hr 	0.5 	5 to 20 	1 to 5 	Yes 	Building Foundation 	Yes 	None
Infiltration trenches or Infiltration chambers	1 	5:1 to 20:1 	Not a constraint 	1 to 2 	0 to 1 	<15 % 	Noix 	4m- Building FoundationUnderground Utilities, Trees,Drinking Water WellheadProtection Areas 	No 	2 year - WHPA-B
Bioretention 	1 (infiltrating); Not a constraint (non-infiltrating)	5:1 to 15:1 	Decompaction and underdrain recommendedif < 15 mm/hr (infiltrating) 	1 to 2 	5 to 10 	0 to 2 	No (infiltrating)ix; Yes (non-infiltrating)	4m- Building FoundationUnderground Utilities, Trees,Drinking Water WellheadProtection Areas 	No (infiltrating); Yes (non-infiltrating)	2 year - WHPA-B (infiltrating); None (non-infiltrating)
Stormwater planters 	Not a constraint 	5:1 	Not a constraint 	1 to 2 	2 to 5 	0 to 2 	No (infiltrating)ix; Yes (non-infiltrating)	Building Foundation, Trees 	No (infiltrating); Yes (non-infiltrating)	2 year - WHPA-B (infiltrating); None (non-infiltrating)
Vegetated filter strips 	Not a constraint 	4:1 or less 	Decompaction if < 15 mm/hr 	0 to 1 	15 to 20 	1 to 5 	Noix 	None 	Yes 	None
Permeable pavements 	1 (infiltrating); Not applicable (non-infiltrating) 	0 to 1:1 	Underdrain recommended if < 15 mm/hr (infiltrating) 	0.5 to 1 	0 	1 to 5 	No (infiltrating)ix; Yes (non-infiltrating)	4m-Underground UtilitiesDrinking Water WellheadProtection Areas 	No (infiltrating); Yes (non-infiltrating)	2 year - WHPA-B (infiltrating); None (non-infiltrating)
Enhanced swales (featuring check dams) 	1 	5:1 to 10:1 	Decompaction if < 15 mm/hr 	1 to 3 	5 to 15 	0.5 to 6	Noix 	4m- Building FoundationUnderground Utilities 	No 	2 year - WHPA-B
Bioswales (Dry swales) 	1 (infiltrating); Not applicable (non-infiltrating) 	5:1 to 15:1 	Decompaction and underdrain recommended if < 15 mm/hr (infiltrating)	1 to 3 	5 to 10 	0.5 to 6	No (infiltrating)ix; Yes (non-infiltrating)	4m (3m if impermeable lineris used) Building foundation, Underground utilities, Drinking Water Wellhead Protection Areas	No (infiltrating); Yes (non-infiltrating)	2 year - WHPA-B (infiltrating); None (non-infiltrating)
Exfiltration trenches 	1 	5:1 to 10:1 	Not a constraint 	1 to 3 	0 	< 15% 	Noix 	4m- Building FoundationUnderground Utilities, Trees,Drinking Water WellheadProtection Areas 	No 	2 year - WHPA-B
Stormwater tree trenches 	1 	5:1 to 15:1 	Underdrain recommendedif < 15 mm/hr 	1 to 2 	5 to 10 	0 to 2 	No (infiltrating)ix; Yes (non-infiltrating)	4m- Building FoundationUnderground Utilities, Drinking Water WellheadProtection Areas 	No (infiltrating); Yes (non-infiltrating)	2 year - WHPA-B
Notes
i Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock
ii Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice
iii Vertical distance between the inlet and outlet of the LID practice
iv Percent of open pervious land on the site that is required for the LID practice
v Slope at the LID practice location
vi Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff
vii Suitability in areas of karst geologic formations
viii Drinking Water Source Protection wellhead protection area time of travel
ix May be allowed under special circumstances and if appropriate mitigation actions are taken - please contact your local Source Protection Region (SPR) or Source Protection Area (SPA) for further information. You can find your associated SPR/SPA based on your location here and then visit their site here