Open-Sided Stormwater Biofiltration for Unrestricted Tree Root Growth
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Solution Overview
Problem
Existing tree box filter systems restrict root growth of trees due to their enclosed design, leading to stunted growth, susceptibility to disease, and reduced stormwater infiltration capacity, while also limiting direct infiltration of treated water into the groundwater system.
Innovation Solution
A stormwater treatment system with an open-bottomed and partially open-sided container design that allows unrestricted root growth and incorporates engineered media with additives for enhanced pollutant removal, featuring multiple subsurface pipe openings and a flexible impermeable liner for expanded treatment area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an enclosed container design is used for tree box filter systems, then structural containment and media retention are improved, but root growth restriction and tree health deteriorate
Solution Approach 1:
The container is segmented into multiple sections with individual root zones, allowing roots to grow freely within each compartment while maintaining overall structural containment. The container walls are divided into sections that can be independently accessed or modified, enabling root development without compromising structural integrity.
Solution Approach 2:
The container incorporates flexible permeable walls made of mesh or fabric materials that allow root penetration and growth while maintaining structural containment. These flexible walls provide mechanical support while permitting biological function, resolving the contradiction between containment strength and root growth freedom.
2Quantity of substance
If an enclosed container design is used, then media retention is improved, but stormwater infiltration capacity deteriorates
Solution Approach 1:
The container walls are constructed from porous permeable materials such as mesh, fabric, or perforated panels that retain media particles through physical structure while allowing stormwater to pass through. The pore size is designed to be smaller than media particles but larger than water molecules, achieving simultaneous media retention and water infiltration.
Solution Approach 2:
The container employs composite wall structures combining different materials with complementary properties - such as a rigid structural framework coated with permeable membrane, or mesh combined with geotextile fabric - to achieve both media retention and high infiltration capacity that single materials cannot provide alone.
3Stability of the object's composition
If an enclosed design is used, then system stability is improved, but direct infiltration into groundwater system deteriorates
Solution Approach 1:
The container transitions from a fully enclosed three-dimensional structure to an open framework structure where walls are reduced to two-dimensional permeable surfaces. This dimensional reduction allows stormwater to infiltrate through the container walls in multiple directions, enabling direct groundwater connection while maintaining structural stability through the distributed framework.
Solution Approach 2:
The permeable container walls act as intermediary structures between the contained media and the external environment, mediating the interaction between stormwater, media, and groundwater. These intermediary walls facilitate controlled exchange of water and nutrients while maintaining system stability, rather than acting as complete barriers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables healthy tree growth, improves pollutant removal efficacy, and enhances direct infiltration of treated stormwater into the groundwater system, addressing the limitations of traditional closed systems.
Implementation Method 1
The matrix comprises a biodegradable polymer and holds nutrients and water for the tree
Implementation Method 2
incorporates engineered media with additives for enhanced pollutant removal
Implementation Method 3
incorporates engineered media with additives for enhanced pollutant removal
Implementation Method 4
open-bottomed and partially open-sided container design that allows unrestricted root growth and incorporates engineered media with additives for enhanced pollutant removal, featuring multiple subsurface pipe openings and a flexible impermeable liner for expanded treatment area
Data Source
AI summary
A stormwater treatment system and method for removing sediment, chemical pollutants, and debris from stormwater runoff by utilizing bioretention practices including physical, chemical and biological processes. Stormwater is directed into a primarily open-bottomed, multi-dimensional container whereby entrained sediment and other transportable materials are filtered and treated through a media filter layer consisting of inorganic and/or organic materials. A live plant (preferably a tree) situated within the container with roots resident in the media filter layer with the ability for expansion beyond the perimeter of the container through openings in one or more sidewalls. The treated water may be further conveyed beyond the perimeter of the container by additional openings and/or piping. A vertically positioned overflow/bypass/clean out piping apparatus may be included within the stormwater treatment system to provide additional water conveyance. Additional ancillary conveyance, filtration and storage facilities may be connected to the described stormwater treatment system as conditions warrant.