Difference between revisions of "Site considerations"
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{|class="wikitable" | {|class="wikitable" | ||
|+ | |+ | ||
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− | ! | + | !Installation type |
− | ! | + | !Depth to high water or bedrock (m)<sup>i</sup> |
− | ! | + | !Ratio of impervious drainage area to <br>permeable facility footprint area |
− | ! | + | !Native soil infiltration rate (mm/hr)<sup>ii</sup> |
− | ! | + | !Head (m)<sup>iii</sup> |
− | ! | + | !Space %<sup>iv</sup> |
− | ! | + | !Slope %<sup>v</sup> |
− | ! | + | !Applicable in pollution hotspots<sup>vi</sup> |
− | + | !Set backs | |
− | + | !Karst<sup>vii</sup> | |
− | + | !Wellhead protection area<sup>viii</sup>| 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 | ||
+ | |- | ||
+ | |'''[[rainwater harvesting|Cisterns]]''' | ||
+ | |Not a constraint | ||
+ | |Not applicable||Not a constraint||0||0||0||Yes||None||Yes||None | ||
+ | |- | ||
+ | |'''[[Downspout disconnection|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 %||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 year - WHPA-B | ||
+ | |- | ||
+ | |'''[[Bioretention]]''' | ||
+ | |1 (infiltrating); Not a constraint (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 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)<sup>ix</sup>; 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||No<sup>ix</sup>||None||Yes||None | ||
+ | |- | ||
+ | |'''[[Permeable pavements]]''' | ||
+ | |1 (infiltrating); Not applicable (non-infiltrating) | ||
+ | |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 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||No<sup>ix</sup>||4m- Building Foundation<br>Underground Utilities||No||2 year - WHPA-B | ||
+ | |- | ||
+ | |'''[[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 year - WHPA-B (infiltrating); None (non-infiltrating) | ||
|- | |- | ||
− | + | |'''[[Exfiltration trenches]]''' | |
− | + | |1 | |
− | + | |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 year - WHPA-B | |
− | |||
|- | |- | ||
− | + | |'''[[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 (infiltrating)<sup>ix</sup>; Yes (non-infiltrating)||4m- Building Foundation<br>Underground Utilities, <br>Drinking Water Wellhead<br>Protection Areas||No (infiltrating); Yes (non-infiltrating)||2 year - WHPA-B | |
+ | |} | ||
+ | {| 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> | |
− | |||
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− | |||
− | |||
− | |||
− | |||
|- | |- | ||
− | + | |<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> | |
− | |||
− | |||
|- | |- | ||
− | + | |<sup>iv</sup> <small>Percent of open pervious land on the site that is required for the LID practice</small> | |
− | |||
− | |||
|- | |- | ||
− | + | |<sup>v</sup> <small>Slope at the LID practice location </small> | |
− | + | |- | |
− | + | |<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> | |
− | |||
− | |||
|- | |- | ||
− | + | |<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> | |
− | |||
− | |||
|} | |} |
Latest revision as of 20:52, 3 April 2023
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 year - WHPA-B |
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 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 Utilities Drinking Water Wellhead Protection 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 Foundation Underground 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 liner is 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 Foundation Underground Utilities, Trees, Drinking Water Wellhead Protection Areas |
No | 2 year - WHPA-B |
Stormwater tree trenches | 1 | 5:1 to 15:1 | Underdrain recommended if < 15 mm/hr |
1 to 2 | 5 to 10 | 0 to 2 | No (infiltrating)ix; Yes (non-infiltrating) | 4m- Building Foundation Underground Utilities, Drinking Water Wellhead Protection 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 |