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→Soil cells
<imagemap>
<imagemap>
Image:Extended tree pit.png|thumb|700 px|This is an image map of an extended tree pit, clicking on components will load the appropriate article.
Image:Extended tree pit.png|thumb|500 px|This is an image map of an extended tree pit, clicking on components will load the appropriate article.
rect 241 1143 296 1338 [[Soil cells]]
rect 241 1143 296 1338 [[Soil cells]]
rect 616 1143 669 1338 [[Soil cells]]
rect 616 1143 669 1338 [[Soil cells]]
==Soil cells==
==Soil cells==
These are (usually plastic) supporting structures placed around the trees and beneath adjacent paved areas. They prevent compaction to the roots of the tree and prevent root damage to the paving. They are sometimes configured to receive stormwater and to enclose ponded water which can then infiltrate the soil surrounding the tree.
These are (usually plastic) supporting structures placed around the trees and beneath adjacent paved areas. They prevent compaction to the roots of the tree and prevent root damage to the paving. They are sometimes configured to receive stormwater and to enclose ponded water which can then infiltrate the soil surrounding the tree, for instance in a depressed drain [[inlets|inlet]] design as presented in the image to the right.
Things to consider in design:
Things to consider in design:
*If the system is unlined it is hydraulically equivalent to a [[bioretention]] cell and provides similar water quality benefits.
*If the system is unlined it is hydraulically equivalent to a [[bioretention]] cell and provides similar water quality benefits.
*If the system is lined and underdrained it is hydraulically similar to a large [[stormwater planter]]. Depending on the design detail it may retain significant stormwater within the planting soil volume and will provide water quality benefits.
*If the system is lined and underdrained it is hydraulically similar to a large [[stormwater planter]]. Depending on the design detail it may retain significant stormwater within the planting soil volume and will provide water quality benefits.
===Inlets===
===Inlets===
[[File:DepressedDrain_SoilCell.png|thumb|500px|A surface [[inlets|inlet]] configuration featuring a depressed drain routing water collected from the street to an enclosed area infiltrating water to soil cells underneath.]]
Multiple methods for distribution and conveyance of runoff into the system are recommended for redundancy and conservative designs.
Multiple methods for distribution and conveyance of runoff into the system are recommended for redundancy and conservative designs.
Combinations may be made of:
Combinations may be made of:
*direct infiltration from permeable paving.
*direct infiltration from permeable paving.
See also [[Inlets]] and [[pretreatment]]
See also [[Inlets]] and [[pretreatment]]
===Species selection===
[[Trees: List]]
===Planting pit sizing===
[[Bioretention: Sizing]]
===Underdrain===
===Underdrain===