Difference between revisions of "Site considerations"
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!Wellhead protection area<ref>|Time-of-travel within wellhead protection areas</ref> | !Wellhead protection area<ref>|Time-of-travel within wellhead protection areas</ref> | ||
|- | |- | ||
| − | |'''Rain Barrel''' | + | |'''[[Rain barrels|Rain Barrel]''' |
|Not applicable | |Not applicable | ||
||5 to 50 m<sup>2</sup>||Not applicable||1||0||NA||Yes||None||No||None | ||5 to 50 m<sup>2</sup>||Not applicable||1||0||NA||Yes||None||No||None | ||
|- | |- | ||
| − | |'''Cistern''' | + | |'''[[rainwater harvesting|Cistern]]''' |
|Not applicable | |Not applicable | ||
|1:1||Not applicable||0||0||0||Yes||None||No||None | |1:1||Not applicable||0||0||0||Yes||None||No||None | ||
|- | |- | ||
| − | |'''Roof downspout disconnection''' | + | |'''[[Downspout disconnection|Roof downspout disconnection]]''' |
|Not applicable | |Not applicable | ||
|5 to 100 m<sup>2</sup>||Amend if < 15 mm/hr||0.5||5 to 20||1 to 5||Yes||Building Foundation||No||None | |5 to 100 m<sup>2</sup>||Amend if < 15 mm/hr||0.5||5 to 20||1 to 5||Yes||Building Foundation||No||None | ||
| Line 31: | Line 31: | ||
|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||Yes||2 yr | |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||Yes||2 yr | ||
|- | |- | ||
| − | |'''Bioretention''' | + | |'''[[Bioretention]]''' |
|1 | |1 | ||
| − | |5:1 to 15:1||Underdrain recommended<br>if < 15 mm/hr||1 to 2||5 to 10||0 to 2||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||Yes||2 yr | + | |5:1 to 15:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 10||0 to 2||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||Yes||2 yr |
|- | |- | ||
| − | |'''Stormwater planters''' | + | |'''[[Stormwater planters]]''' |
|Not applicable | |Not applicable | ||
|5:1||Not applicable||1 to 2||2 to 5||0 to 2||Yes||Building Foundation, Trees||No||None | |5:1||Not applicable||1 to 2||2 to 5||0 to 2||Yes||Building Foundation, Trees||No||None | ||
|- | |- | ||
| − | |'''Vegetated filter strip''' | + | |'''[[Vegetated filter strip]]''' |
|1 | |1 | ||
|5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||No||None | |5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||No||None | ||
|- | |- | ||
| − | |'''Permeable pavement''' | + | |'''[[Permeable pavement]]''' |
|1 | |1 | ||
|1:1 to 1.2:1||Underdrain recoomended <br> if < 15 mm/hr||0.5 to 1||0||1 to 5||No||4m-Underground Utilities<br>Drinking Water Wellhead<br>Protection Areas||Yes||2 Yr | |1:1 to 1.2:1||Underdrain recoomended <br> if < 15 mm/hr||0.5 to 1||0||1 to 5||No||4m-Underground Utilities<br>Drinking Water Wellhead<br>Protection Areas||Yes||2 Yr | ||
|- | |- | ||
| − | |'''Enhanced grass swale (has checkdams)''' | + | |'''[[Enhanced grass swale]](has checkdams)''' |
|1 | |1 | ||
|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 | |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)''' | + | |'''[[Dry swale]] (Bioswale)''' |
|1 | |1 | ||
|5:1 to 15:1||Underdrain recommended <br> if < 15 mm/hr||1 to 3||5 to 10||0.5 to 6||No||4m (3m if impermeable liner<br>is used)Building foundation,<br> Underground utilities, drinking<br>water wellhead protection areas||Yes||2 Yr | |5:1 to 15:1||Underdrain recommended <br> if < 15 mm/hr||1 to 3||5 to 10||0.5 to 6||No||4m (3m if impermeable liner<br>is used)Building foundation,<br> Underground utilities, drinking<br>water wellhead protection areas||Yes||2 Yr | ||
|- | |- | ||
| − | |'''Perforated pipe system''' | + | |'''[[Perforated pipe system]]''' |
|1 | |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||Yes||2 Yr | |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||Yes||2 Yr | ||
|} | |} | ||
Revision as of 14:18, 13 February 2019
| Installations type | Depth to high water or bedrock (m)[1] | Typical ratio of Impervious drainage area to Treatment Facility Area |
Native soil infiltration rate (mm/hr)[2] | Head (m)[3] | Space % [4] | Slope % [5] | Applicable in pollution hotspots [6] | Set backs | Water table separation[7] | Wellhead protection area[8] |
|---|---|---|---|---|---|---|---|---|---|---|
| [[Rain barrels|Rain Barrel] | Not applicable | 5 to 50 m2 | Not applicable | 1 | 0 | NA | Yes | None | No | None |
| Cistern | Not applicable | 1:1 | Not applicable | 0 | 0 | 0 | Yes | None | No | None |
| Roof downspout disconnection | Not applicable | 5 to 100 m2 | Amend if < 15 mm/hr | 0.5 | 5 to 20 | 1 to 5 | Yes | Building Foundation | No | None |
| Soakaway, infiltration trench or chamber | 1 | 5:1 to 20:1 | Not a constraint | 1 to 2 | 0 to 1 | <15 % | No | 4m- Building Foundation Underground Utilities, Trees, Drinking Water Wellhead Protection Areas |
Yes | 2 yr |
| Bioretention | 1 | 5:1 to 15:1 | Underdrain recommended if < 15 mm/hr |
1 to 2 | 5 to 10 | 0 to 2 | No | 4m- Building Foundation Underground Utilities, Trees, Drinking Water Wellhead Protection Areas |
Yes | 2 yr |
| Stormwater planters | Not applicable | 5:1 | Not applicable | 1 to 2 | 2 to 5 | 0 to 2 | Yes | Building Foundation, Trees | No | None |
| Vegetated filter strip | 1 | 5:1 | Amend if < 15 mm/hr | 0 to 1 | 15 to 20 | 1 to 5 | No | None | No | None |
| Permeable pavement | 1 | 1:1 to 1.2:1 | Underdrain recoomended if < 15 mm/hr |
0.5 to 1 | 0 | 1 to 5 | No | 4m-Underground Utilities Drinking Water Wellhead Protection Areas |
Yes | 2 Yr |
| Enhanced grass swale(has checkdams) | 1 | 5:1 to 10:1 | Not applicable | 1 to 3 | 5 to 15 | 0.5 to 6 | No | 4m- Building Foundation Underground Utilities |
Yes | None |
| Dry swale (Bioswale) | 1 | 5:1 to 15:1 | Underdrain recommended if < 15 mm/hr |
1 to 3 | 5 to 10 | 0.5 to 6 | No | 4m (3m if impermeable liner is used)Building foundation, Underground utilities, drinking water wellhead protection areas |
Yes | 2 Yr |
| Perforated pipe system | 1 | 5:1 to 10:1 | Not a constraint | 1 to 3 | 0 | < 15% | No | 4m- Building Foundation Underground Utilities, Trees, Drinking Water Wellhead Protection Areas |
Yes | 2 Yr |
- ↑ Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock
- ↑ Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice
- ↑ Vertical distance between the inlet and outlet of the LID practice
- ↑ Percent of open pervious land on the site that is required for the LID practice
- ↑ Slope at the LID practice location
- ↑ Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff
- ↑ Must have adequate separation from the seasonally high water table or top of bedrock elevation
- ↑ |Time-of-travel within wellhead protection areas