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→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.
===Inlets===
===Inlets===
[[File:DepressedDrain_SoilCell.png|thumb|400px|Sometimes configured to enclose ponded water which can then infiltrate the soil surrounding the tree, for instance in a depressed drain [[inlets|inlet]] design.]]
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: