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Created page with "{|class="wikitable" |+Specifications for Enhanced Swales / Bioswales / Grass Wales / Dry Swales |- !Material !Specification !Quantity |- |'''Site Layout''' | * Should be Canad..."
{|class="wikitable"
|+Specifications for Enhanced Swales / Bioswales / Grass Wales / Dry Swales
|-
!Material
!Specification
!Quantity
|-
|'''Site Layout'''
|
* Should be Canadian Soil Classification System sandy loam with combined silt- and clay-sized content between 18-35%; and sand- to fine gravel-sized content (0.074 to 5 mm dia.) between 65-82%.
* pH value (6.0 - 8.0).
* Salt level <u><</u> 2 mmhos/cm.
* Percent organic matter shall be 3-5%, by dry weight.
|
* Growing medium compacted to 80-90% below the tree root ball to prevent settling.
* Bioretention filter media (see [https://wiki.sustainabletechnologies.ca/wiki/LID_BMP_Fact_Sheets#Bioretention| Bioretention Fact Sheet]) may be suitable for use as growing medium, depending on climate and tree species.
|-
|'''Inlets'''
|
* Structural soils consist of 3 components, mixed in the following proportions by weight: crushed stone (79.07%), clay loam soil (20%), and hydrogel tackifier (0.03%).
* Total moisture at mixing should be 10% as per AASHTO T-99 optimum moisture.
* The clay loam soil should conform to the Canadian soil classification system (gravel <5%, sand 25-30%, silt 20-40%, clay 25-40%). Organic matter should range between 2 to 5% by dry weight.
* Hydrogel (potassium propenoate-propenamide copolymer), is added as a tackifier to prevent separation of the stone and soil during mixing and installation.
|
* Crushed stone (granite or limestone) narrowly graded from 20 to 40 mm diameter, highly angular with no fines.
* The entire pile is turned and mixed until a uniform blend is produced. The structural soil is then installed and compacted in 150 mm lifts.
|-
|'''Pre-Treatment'''
|
* Decompact native subgrade soil under tree openings and between granular bases of modular soil support structure rows during installation for better infiltration drainage performance.
|
* Structural concrete panel is 250 mm thick, contains rebar reinforcements and sits on equal-sized concrete footing supports on rows of modular soil support structures
* Modular soil supports are supported by a minimum 150 mm base of compacted granular material.
|-
|'''Planting Soil/ Filter Media'''
|
* Aggregates are used in modular soil support systems below the structures as the trench base layer, and sometimes, on top of the structures, as the pavement base layer.
|
* Specifications for aggregate base materials determined by the designing Engineer based on varying levels of structural loading and hydraulic requirements.
|-
|'''Check Dams'''
|
* Geotextile material specifications should conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics.
* Geotextile installed on tree trench sides and around perforated distribution and underdrain pipes should be woven monofilament or non-woven needle punched fabrics. '''Note''': Woven slit film and non-woven heat bonded fabrics should not be used as they are prone to clogging.
|
* Where a root barrier is needed to prevent the migration of roots out of the tree trench, use impermeable ribbed barrier material with a thickness of 1-2 mm.
|-
|'''Plants'''
|
* A standpipe from the underdrain pipe to the growing medium or pavement surface can be used for inspection and maintenance. The top of the standpipe should be covered with a sealable cap and secured with a vandal-proof fastener.
|
* Should be minimum 150 mm dia. perforated HDPE or equivalent material, smooth interior wall and continuously perforated with geotextile sock
|}
|+Specifications for Enhanced Swales / Bioswales / Grass Wales / Dry Swales
|-
!Material
!Specification
!Quantity
|-
|'''Site Layout'''
|
* Should be Canadian Soil Classification System sandy loam with combined silt- and clay-sized content between 18-35%; and sand- to fine gravel-sized content (0.074 to 5 mm dia.) between 65-82%.
* pH value (6.0 - 8.0).
* Salt level <u><</u> 2 mmhos/cm.
* Percent organic matter shall be 3-5%, by dry weight.
|
* Growing medium compacted to 80-90% below the tree root ball to prevent settling.
* Bioretention filter media (see [https://wiki.sustainabletechnologies.ca/wiki/LID_BMP_Fact_Sheets#Bioretention| Bioretention Fact Sheet]) may be suitable for use as growing medium, depending on climate and tree species.
|-
|'''Inlets'''
|
* Structural soils consist of 3 components, mixed in the following proportions by weight: crushed stone (79.07%), clay loam soil (20%), and hydrogel tackifier (0.03%).
* Total moisture at mixing should be 10% as per AASHTO T-99 optimum moisture.
* The clay loam soil should conform to the Canadian soil classification system (gravel <5%, sand 25-30%, silt 20-40%, clay 25-40%). Organic matter should range between 2 to 5% by dry weight.
* Hydrogel (potassium propenoate-propenamide copolymer), is added as a tackifier to prevent separation of the stone and soil during mixing and installation.
|
* Crushed stone (granite or limestone) narrowly graded from 20 to 40 mm diameter, highly angular with no fines.
* The entire pile is turned and mixed until a uniform blend is produced. The structural soil is then installed and compacted in 150 mm lifts.
|-
|'''Pre-Treatment'''
|
* Decompact native subgrade soil under tree openings and between granular bases of modular soil support structure rows during installation for better infiltration drainage performance.
|
* Structural concrete panel is 250 mm thick, contains rebar reinforcements and sits on equal-sized concrete footing supports on rows of modular soil support structures
* Modular soil supports are supported by a minimum 150 mm base of compacted granular material.
|-
|'''Planting Soil/ Filter Media'''
|
* Aggregates are used in modular soil support systems below the structures as the trench base layer, and sometimes, on top of the structures, as the pavement base layer.
|
* Specifications for aggregate base materials determined by the designing Engineer based on varying levels of structural loading and hydraulic requirements.
|-
|'''Check Dams'''
|
* Geotextile material specifications should conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics.
* Geotextile installed on tree trench sides and around perforated distribution and underdrain pipes should be woven monofilament or non-woven needle punched fabrics. '''Note''': Woven slit film and non-woven heat bonded fabrics should not be used as they are prone to clogging.
|
* Where a root barrier is needed to prevent the migration of roots out of the tree trench, use impermeable ribbed barrier material with a thickness of 1-2 mm.
|-
|'''Plants'''
|
* A standpipe from the underdrain pipe to the growing medium or pavement surface can be used for inspection and maintenance. The top of the standpipe should be covered with a sealable cap and secured with a vandal-proof fastener.
|
* Should be minimum 150 mm dia. perforated HDPE or equivalent material, smooth interior wall and continuously perforated with geotextile sock
|}