Changes

===Variations of Stormwater Tree Trenches===

===Variations of Stormwater Tree Trenches===

[[File:Stormwater Tree Trench low permeability native subsoil with structural soil medium.png|thumb|left|450px|'''Tree Trench with High Permeability Subsoil, with Structural Soil Medium''' - This tree trench configuration possess low permeability soil ([[Soil groups]] C or D), along with a clean-out stand pipe for the underdrain, which is placed lower in the feature to allow water to infiltrate into the system and remove contaminants from the road/sidewalk before being taken up by the tree or transported out of the feature and back into the storm sewer system. It also contains structural soil, which is an engineered medium that can be compacted to support sidewalks, while also creating extra space for suitable tree root growth under paved surfaces. This space allows the tree to mature unimpeded and cuts down on replacement costs for tree removal and maintenance costs of the surrounding sidewalk and road.]]

File:SWTT Low Perm Soil Cells Final.png|thumb|left|450px|'''Tree Trench with Low Permeability Subsoil, with Soil Cells''' - This tree trench configuration possess low permeability soil ([[Soil groups]] C or D), along with a clean-out stand pipe for the underdrain, which is placed lower in the feature to allow water to infiltrate into the system and remove contaminants from the road/sidewalk before being taken up by the tree or transported out of the feature and back into the storm sewer system. It also includes soil cells or 'modular soil support systems'.  Soil cells are an alternative to structural soil media and are used adjacent to tree pits to provide room for tree roots to spread out under paved surfaces surrounding the tree trench. The growing media in soil cells typically has higher organic content than structural soils and with a looser structure and higher nutrient content of the soil, these support systems provide the most favourable environment for healthy tree growth in the urban setting.

rect 1605 3079 1983 3500 [[Soil cells: Gallery|Soil Cells]]

[[File:Stormwater Tree Trench high permeability native subsoil with structural soil medium.png|thumb|right|450px|'''Tree Trench with Low Permeability Subsoil, with Soil Cells''' - This tree trench configuration possess high permeability soil ([[Soil groups]] A or B), and as a result possesses a clean-out stand pipe/clean-out for the underdrain, which is placed higher in the feature as water will infiltrate through the system much quicker. This allows for further infiltration into the system into the underlying native soil below. Once water has percolated through the soil to the perforated underdrain it is then transported out of the feature and back into the storm sewer system. This configuration also includes a monitoring well to monitor water level in the feature below the aggregate line at the bottom of the feature. This feature contains structural soil, similar to the low permeability configuration.]]

File:SWTT High Perm Soil Cells Final.png|thumb|right|450px|'''Tree Trench with High Permeability Subsoil, with Soil Cells''' - This tree trench configuration possess high permeability soil ([[Soil groups]] A or B), and as a result possesses a stand pipe/clean-out for the underdrain, which is placed higher in the feature as water will infiltrate through the system much quicker. This allows for further infiltration into the system into the underlying native soil below. Once water has percolated through the soil to the perforated underdrain it is then transported out of the feature and back into the storm sewer system. This configuration also includes a monitoring well to monitor water level in the feature below the aggregate line at the bottom of the feature. This feature also contains soil cells similar to the low permeability configuration.

rect 1534 3458 1576 3737 [[Stormwater Tree Trenches|Water Storage Depth]]

[[File:Stormwater Tree Trench high permeability native subsoil with soil cells.png|thumb|center|450px|'''Tree Trench with High Permeability Subsoil, with Soil Cells''' - This tree trench configuration possess high permeability soil, similar to the configuration on the right, but instead of structural soil this tree trench contains soil cells or 'modular soil support systems'.  Soil cells are an alternative to structural soil media and are used adjacent to tree pits to provide room for tree roots to spread out under paved surfaces surrounding the tree trench. The growing media in soil cells typically has higher organic content than structural soils and with a looser structure and higher nutrient content of the soil, these support systems provide the most favourable environment for healthy tree growth in the urban setting.]]

File:SWTT Struct Soil Med High Perm Final.png|thumb|center|450px|'''Tree Trench with High Permeability Subsoil, with Structural Soil Medium''' - This tree trench configuration possess high permeability soil, similar to the configuration, first on the left, but instead of soil cells this tree trench contains structural soil, which is an engineered medium that can be compacted to support sidewalks, while also creating extra space for suitable tree root growth under paved surfaces. This space allows the tree to mature unimpeded and cuts down on replacement costs for tree removal and maintenance costs of the surrounding sidewalk and road. Once water has percolated through the soil to the perforated underdrain it is then transported out of the feature and back into the storm sewer system. This configuration also includes a monitoring well to monitor water level in the feature below the aggregate line at the bottom of the feature.  

rect 1605 3079 1983 3500 [[Stormwater Tree Trenches: Specifications|Structural Soil Medium]]

==Inspection and Maintenance==

==Inspection and Maintenance==