Difference between revisions of "Site considerations"
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|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 | |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 | ||
|- | |- | ||
| − | |''' | + | |'''[[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||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||No||2 yr | ||
| Line 39: | Line 39: | ||
|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); Yes (non-infiltrating)||Building Foundation, Trees||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating) | ||
|- | |- | ||
| − | |'''[[Vegetated filter | + | |'''[[Vegetated filter strips]]''' |
|Not applicable | |Not applicable | ||
|5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||Yes||None | |5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||Yes||None | ||
| Line 47: | Line 47: | ||
|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) | |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) | ||
|- | |- | ||
| − | |'''[[Enhanced | + | |'''[[Enhanced swales]] (has checkdams)''' |
|Not applicable | |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 | |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 | ||
| Line 55: | Line 55: | ||
|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) | |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) | ||
|- | |- | ||
| − | |'''[[Exfiltration | + | |'''[[Exfiltration trenches]]''' |
|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||No||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||No||2 Yr | ||
|} | |} | ||
Revision as of 17:11, 22 November 2019
| Installation 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 | Karst[7] | Wellhead protection area[8] |
|---|---|---|---|---|---|---|---|---|---|---|
| Rain Barrel | Not applicable | 5 to 50 m2 | Not applicable | 1 | 0 | NA | Yes | None | Yes | None |
| Cistern | Not applicable | 1:1 | Not applicable | 0 | 0 | 0 | Yes | None | Yes | 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 | Yes | None |
| Infiltration trenches or Infiltration chambers | 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 |
No | 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 (infiltrating); 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 applicable | 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) |
| Vegetated filter strips | Not applicable | 5:1 | Amend if < 15 mm/hr | 0 to 1 | 15 to 20 | 1 to 5 | No | None | Yes | None |
| Permeable pavement | 1 | 1:1 to 1.2:1 | Underdrain recommended if < 15 mm/hr |
0.5 to 1 | 0 | 1 to 5 | No (infiltrating); Yes (non-infiltrating) | 4m-Underground Utilities Drinking Water Wellhead Protection Areas |
No (infiltrating); Yes (non-infiltrating) | 2 Yr (infiltrating); None (non-infiltrating) |
| Enhanced swales (has checkdams) | Not applicable | 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 (infiltrating); 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% | No | 4m- Building Foundation Underground Utilities, Trees, Drinking Water Wellhead Protection Areas |
No | 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
- ↑ Suitability in areas of karst geologic formations
- ↑ | Drinking Water Source Protection wellhead protection area time of travel