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The DeepRoot Silva Cell
Integrating Trees, Soil & Stormwater for Sustainable Development.
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Photo courtesy of James Urban
“Nearly all of the associated problems result from one underlying cause: loss of the water-retaining and evapotranspirating functions of the soil and vegetation in the urban landscape.”
EPA commissioned report Urban Stormwater Management in the United States, 2008.
What’s missing from this picture?
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It’s all about soil...
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General Design Goals
Water quality and Water quantity
1. Volume and time water is held at the site
2. Increase infiltration and evapo-transpiration to reduce overall surface runoff
3. Reduce pollutant load
4. Reduce water temperature
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Check dams
Rain Garden Case Studies
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Surface water infiltration – Absorbing soils in planted areas or pervious pavers, and green roof areas.
Pavers and green roof approach is expensive.Limited by infiltration rate of soil and subsoil. Limited storage
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How can we start to solve some of these problems?
• Large trees
• Treating stormwater as a resource
• Integrating trees, soil and stormwater
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Grow big trees. Manage rainwater. Do it all on-site.
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Pervious Pavement is the simplest way to get stormwater in to Silva Cells for storage and treatment
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Perforated distribution pipe is installed to bring water from the catch basin through the Silva Cell system
Queensway Installation
Catch Basin
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MMarquette Street, Minneapolis
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Combined rain garden and below paving treatmentIn a suburban strip development
LR
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Large Canopy
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How much soil does a tree need?
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Summary
PondsCisterns
Green roofsPervious pavers
Rain gardens Biofiltration with trees
Cities must employ all of the design options
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Basic Applications
Streetscapes/Plazas
Break-out zones
Parking lots
Green walls
Green roofs/on-structure
All of these applications can be modified to optimize tree growth or stormwater management.
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Parking Lot application
Use Silva Cells in parking lots to achieve green canopy cover goals and downsize the stormwater system without compromising parking spaces or utilities.
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Wal-Mart SuperStore Parking LotLakeland, FL
Parking Lot application
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Image courtesy of Bartlett Tree Research Laboratory (North Carolina)
Research shows trees grow best in uncompacted soil
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Flexible and modular.
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