Difference between revisions of "Site considerations"

From LID SWM Planning and Design Guide
Jump to navigation Jump to search
 
(34 intermediate revisions by the same user not shown)
Line 5: Line 5:
 
!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)<ref>Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock</ref>
!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)<ref>Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice</ref>
 
!Head (m)<ref>Vertical distance between the inlet and outlet of the LID practice</ref>
 
!Head (m)<ref>Vertical distance between the inlet and outlet of the LID practice</ref>
Line 12: Line 12:
 
!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 <ref>Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff</ref>
 
!Set backs
 
!Set backs
!Karst<ref>Suitability in areas of karst geologic formations</ref>
+
![[Karst]]<ref>Suitability in areas of karst geologic formations</ref>
 
!Wellhead protection area<ref>| Drinking Water Source Protection wellhead protection area time of travel</ref>
 
!Wellhead protection area<ref>| Drinking Water Source Protection wellhead protection area time of travel</ref>
 
|-
 
|-
|'''[[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 to 1||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
 
|-
 
|-
 
|'''[[Infiltration trenches]] or [[Infiltration chambers]]'''
 
|'''[[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||<15 %||No||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); 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); Yes (non-infiltrating)||Building Foundation, Trees||No (infiltrating); Yes (non-infiltrating)||2 Yr (infiltrating); None (non-infiltrating)
 
|-
 
|-
 
|'''[[Vegetated filter strips]]'''
 
|'''[[Vegetated filter strips]]'''
|Not applicable
+
|Not a constraint
|5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||Yes||None
+
|4:1 or less||Decompaction if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||Yes||None
 
|-
 
|-
 
|'''[[Permeable pavements]]'''
 
|'''[[Permeable pavements]]'''
|1
+
|1 (infiltrating); Not applicable (non-infiltrating)
|1:1||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)
+
|0 to 1:1||[[Underdrain]] recommended <br> if < 15 mm/hr (infiltrating)||0.5 to 1||50 to 100||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 swales]] (has checkdams)'''
+
|'''[[Enhanced swales]] (featuring check dams)'''
|Not applicable
+
|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||Decompaction if < 15 mm/hr||1 to 3||5 to 15||0.5 to 6||No||4m- Building Foundation<br>Underground Utilities||No||2 Yr
 
|-
 
|-
|'''[[Dry swale]] (Bioswale)'''
+
|'''[[Bioswales]] (Dry swales)'''
|1
+
|1 (infiltrating); Not applicable (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)
+
|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); 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]]'''
 
|'''[[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
|}
+
|-
 +
|'''[[Stormwater Tree Trenches|Stormwater tree trenches]]'''
 +
|1
 +
|5:1 to 10:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 15||0 to 2||No||4m- Building Foundation<br>Underground Utilities, <br>Drinking Water Wellhead<br>Protection Areas||No||2 yr

Latest revision as of 16:18, 30 March 2022

Installation type Depth to high water or bedrock (m)[1] Ratio of impervious drainage area to
permeable facility footprint 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 barrels Not a constraint Not applicable Not a constraint 1 0 to 1 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 <15 % No 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); 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); 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 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 50 to 100 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 (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 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); 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
Stormwater tree trenches 1 5:1 to 10:1 Underdrain recommended
if < 15 mm/hr
1 to 2 5 to 15 0 to 2 No 4m- Building Foundation
Underground Utilities,
Drinking Water Wellhead
Protection Areas
No 2 yr
  1. Minimum depth between the base of the facility and the elevation of the seasonally high water table or top of bedrock
  2. Infiltration rate estimates based on measurements of hydraulic conductivity under field saturated conditions at the proposed location and depth of the practice
  3. Vertical distance between the inlet and outlet of the LID practice
  4. Percent of open pervious land on the site that is required for the LID practice
  5. Slope at the LID practice location
  6. Suitable in pollution hot spots or runoff source areas where land uses or activities have the potential to generate highly contaminated runoff
  7. Suitability in areas of karst geologic formations
  8. | Drinking Water Source Protection wellhead protection area time of travel