Difference between revisions of "Site considerations"

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{|class="wikitable"
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!Installation type
!Installation type
!Depth to high water or bedrock (m)<ref>Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock</ref>
!Depth to high water or bedrock (m)<sup>i</sup>
!Typical ratio of <br>Impervious drainage area<br> to treatment facility area
!Ratio of impervious drainage area to <br>permeable facility footprint area
!Native soil infiltration rate (mm/hr)<ref>Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice</ref>
!Native soil infiltration rate (mm/hr)<sup>ii</sup>
!Head (m)<ref>Vertical distance between the inlet and outlet of the LID practice</ref>
!Head (m)<sup>iii</sup>
!Space % <ref>Percent of open pervious land on the site that is required for the LID practice</ref>
!Space %<sup>iv</sup>
!Slope % <ref>Slope at the LID practice location</ref>
!Slope %<sup>v</sup>
!Applicable in pollution hotspots <ref>Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff</ref>
!Applicable in pollution hotspots<sup>vi</sup>
!Set backs
!Set backs
!Karst<ref>Suitability in areas of karst geologic formations</ref>
!Karst<sup>vii</sup>
!Wellhead protection area<ref>| Drinking Water Source Protection wellhead protection area time of travel</ref>
!Wellhead protection area<sup>viii</sup>| Drinking Water Source Protection wellhead protection area time of travel
|-
|-
|'''[[Rain barrels|Rain Barrel]]'''
|'''[[Rain barrels]]'''
|Not applicable
|Not a constraint
||5 to 50 m<sup>2</sup>||Not applicable||1||0||NA||Yes||None||Yes||None
||Not applicable||Not a constraint||1||0||NA||Yes||None||Yes||None
|-
|-
|'''[[rainwater harvesting|Cistern]]'''
|'''[[rainwater harvesting|Cisterns]]'''
|Not applicable
|Not a constraint
|1:1||Not applicable||0||0||0||Yes||None||Yes||None
|Not applicable||Not a constraint||0||0||0||Yes||None||Yes||None
|-
|-
|'''[[Downspout disconnection|Roof downspout disconnection]]'''
|'''[[Downspout disconnection|Roof downspout disconnection]]'''
|Not applicable
|Not a constraint
|5 to 100 m<sup>2</sup>||Amend if < 15 mm/hr||0.5||5 to 20||1 to 5||Yes||Building Foundation||Yes||None
|4:1 or less||Decompaction if < 15 mm/hr||0.5||5 to 20||1 to 5||Yes||Building Foundation||Yes||None
|-
|-
|'''Soakaway, infiltration trench or chamber'''
|'''[[Infiltration trenches]] or [[Infiltration chambers]]'''
|1
|1
|5:1 to 20:1||Not a constraint||1 to 2||0 to 1||<15 %||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 yr
|5:1 to 20:1||Not a constraint||1 to 2||0 to 1||<15 %||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 yr
|-
|-
|'''[[Bioretention]]'''
|'''[[Bioretention]]'''
|1
|1 (infiltrating); Not a constraint (non-infiltrating)
|5:1 to 15:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 10||0 to 2||No (infiltrating); Yes (non-infiltrating)||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 yr (infiltrating); None (non-infiltrating)
|5:1 to 15:1||Decompaction and [[Underdrain|underdrain]] recommended<br>if < 15 mm/hr (infiltrating)||1 to 2||5 to 10||0 to 2||No (infiltrating)<sup>ix</sup>; Yes (non-infiltrating)||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 yr (infiltrating); None (non-infiltrating)
|-
|-
|'''[[Stormwater planters]]'''
|'''[[Stormwater planters]]'''
|Not applicable
|Not a constraint
|5:1||Not a constraint||1 to 2||2 to 5||0 to 2||No (infiltrating); Yes (non-infiltrating)||Building Foundation, Trees||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
|5:1||Not a constraint||1 to 2||2 to 5||0 to 2||No (infiltrating)<sup>ix</sup>; Yes (non-infiltrating)||Building Foundation, Trees||No (infiltrating); Yes (non-infiltrating)||2 Yr (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||No<sup>ix</sup>||None||Yes||None
|-
|-
|'''[[Vegetated filter strip]]'''
|'''[[Permeable pavements]]'''
|Not applicable
|1 (infiltrating); Not applicable (non-infiltrating)
|5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||Yes||None
|0 to 1:1||[[Underdrain]] recommended <br> if < 15 mm/hr (infiltrating)||0.5 to 1||0||1 to 5||No (infiltrating)<sup>ix</sup>; Yes (non-infiltrating)||4m-Underground Utilities<br>Drinking Water Wellhead<br>Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
|-
|-
|'''[[Permeable pavement]]'''
|'''[[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||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities||No||2 Yr
|-
|'''[[Bioswales]] (Dry swales)'''
|1 (infiltrating); Not applicable (non-infiltrating)
|5:1 to 15:1||Decompaction and [[Underdrain|underdrain]] recommended <br> if < 15 mm/hr (infiltrating)||1 to 3||5 to 10||0.5 to 6||No (infiltrating)<sup>ix</sup>; Yes (non-infiltrating)||4m (3m if impermeable liner<br>is used) Building foundation,<br> Underground utilities,<br> Drinking Water Wellhead Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
|-
|'''[[Exfiltration trenches]]'''
|1
|1
|1:1 to 1.2:1||Underdrain recommended <br> if < 15 mm/hr||0.5 to 1||0||1 to 5||No (infiltrating); Yes (non-infiltrating)||4m-Underground Utilities<br>Drinking Water Wellhead<br>Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
|5:1 to 10:1||Not a constraint||1 to 3||0||< 15%||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 Yr
|-
|'''[[Stormwater Tree Trenches|Stormwater tree trenches]]'''
|1
|5:1 to 15:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 10||0 to 2||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities, <br>Drinking Water Wellhead<br>Protection Areas||No||2 yr
|}
 
{| style="width: 900px;"
!+ style="text-align: left;" |'''Notes'''
|-
|<sup>i</sup> <small>Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock</small>
|-
|<sup>ii</sup> <small>Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice</small>
|-
|<sup>iii</sup> <small> Vertical distance between the inlet and outlet of the LID practice</small>
|-
|-
|'''[[Enhanced grass swale]] (has checkdams)'''
|<sup>iv</sup> <small>Percent of open pervious land on the site that is required for the LID practice</small>
|Not applicable
|5:1 to 10:1||Not applicable||1 to 3||5 to 15||0.5 to 6||No||4m- Building Foundation<br>Underground Utilities||Yes||None
|-
|-
|'''[[Dry swale]] (Bioswale)'''
|<sup>v</sup> <small>Slope at the LID practice location </small>
|1
|-
|5:1 to 15:1||Underdrain recommended <br> if < 15 mm/hr||1 to 3||5 to 10||0.5 to 6||No (infiltrating); Yes (non-infiltrating)||4m (3m if impermeable liner<br>is used) Building foundation,<br> Underground utilities,<br> Drinking Water Wellhead Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
|<sup>vi</sup> <small>Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff</small>
|-
|<sup>vii</sup> <small>Suitability in areas of karst geologic formations</small>
|-
|<sup>viii</sup> <small>Drinking Water Source Protection wellhead protection area time of travel</small>
|-
|-
|'''[[Exfiltration trench]]'''
|<sup>ix</sup> <small>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 [https://conservationontario.ca/fileadmin/pdf/conservation_authorities_section/SWPSouthernON_EN.pdf SPR/SPA based on your location here] and then visit their [https://conservationontario.ca/conservation-authorities/source-water-protection/source-protection-plans-and-resources site here]</small>  
|1
|5:1 to 10:1||Not a constraint||1 to 3||0||< 15%||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 Yr
|}
|}

Latest revision as of 15:08, 1 June 2022

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 Foundation
Underground Utilities, Trees,
Drinking Water Wellhead
Protection Areas
No 2 yr
Bioretention 1 (infiltrating); Not a constraint (non-infiltrating) 5:1 to 15:1 Decompaction and underdrain recommended
if < 15 mm/hr (infiltrating)
1 to 2 5 to 10 0 to 2 No (infiltrating)ix; Yes (non-infiltrating) 4m- Building Foundation
Underground Utilities, Trees,
Drinking Water Wellhead
Protection Areas
No (infiltrating); Yes (non-infiltrating) 2 yr (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 Yr (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 Utilities
Drinking Water Wellhead
Protection Areas
No (infiltrating); Yes (non-infiltrating) 2 Yr (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 Foundation
Underground Utilities
No 2 Yr
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 liner
is used) Building foundation,
Underground utilities,
Drinking Water Wellhead Protection Areas
No (infiltrating); Yes (non-infiltrating) 2 Yr (infiltrating); None (non-infiltrating)
Exfiltration trenches 1 5:1 to 10:1 Not a constraint 1 to 3 0 < 15% Noix 4m- Building Foundation
Underground Utilities, Trees,
Drinking Water Wellhead
Protection Areas
No 2 Yr
Stormwater tree trenches 1 5:1 to 15:1 Underdrain recommended
if < 15 mm/hr
1 to 2 5 to 10 0 to 2 Noix 4m- Building Foundation
Underground Utilities,
Drinking Water Wellhead
Protection Areas
No 2 yr
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