The following info on conserving urban soil was provided by Ellyn Shea (arborist and consultant in San Francisco). It’s not unusual to find a piece of art or jewelry over 500 years old in a museum’s collection. These precious artifacts are (rightly) treated with great care commensurate with their value. Yet an inch of… More
In the July 2019 issue of ISA Arboriculture & Urban Forestry magazine, Hossain, Stuhlinger, Olson, and Babst contributed, “A Comparison of Indirect Water Devices for Benefiting Newly Transplanted Urban Trees.” Urban trees often undergo a period of post-transplant stress which is exacerbated by a water-limited environment. Watering devices are available to help a newly planted… More
Curtis Hinman is a senior scientist with Herrera Environmental Consultants in Seattle, WA. Before joining Herrera, Curtis was faculty with Washington State University (WSU) Extension and the Department of Biological Systems Engineering, and was the University’s Green Stormwater Infrastructure Specialist. With WSU he co-designed and was lead scientist for the WSU Low Impact Development (LID)… More
The pre-installation meeting is one of the most important — and free! — services offered by DeepRoot. They provide an opportunity for a DeepRoot representative to meet with installing contractors prior to the start of their Silva Cell installations to help ensure that they’re comfortable with the installation process. What are the details of these… More
Do you need to have prior Silva Cell experience to install the system? No! Our Standard Specifications call for Silva Cells to be installed by a “qualified installer whose work has resulted in successful installation of planting soils and planter drainage systems, underground piping, chambers, and vault structures.” In other words, contractors can meet these… More
Tim O’Hare Associates LLP is a leading independent environmental consultancy based in the United Kingdom specializing in soil science and landscape engineering, including soil science, topsoil, habitat creation, sales pitch agronomy, and more. I talked to Tim O’Hare himself to learn more about its reuse, recovery, and what it really means to manufacture soil. … More
Very simply, a mil is one-thousandth of an inch: 1 mil = 0.001 inch. It is not the same as a millimeter; 1 mil = 0.0254 millimeter. Mil is commonly used to describe the thickness of materials such as plastic sheeting, geomembranes and barriers. Understanding this measurement makes it easier to read product specifications and… More
There is no universal list of trees that should — or should not — be planted in cities. A species that performs well in one region, streetscape, or soil type may be poorly suited to another. DeepRoot does not select tree species for individual projects, and the examples in this article should not be treated… More
The following Q&A on soil erosion was answered by Nick Comerford (University of Florida) and was reprinted from the “Soil Matters” blog. Q: What does it mean to say we are losing soil? Where does it go? A: You may hear the phrase: “We are losing our soil.” Sounds serious…but how do we lose… More
What does “good” soil mean? It depends on your point of view. If you are engineer, you like soil that drains well or compacts easily to bear weight. If you are a farmer, you want soil that is fertile, easy to till, and soaks up water without runoff. If you are a tree… well, what… More
This post was originally published in 2017. The National Association of City Transportation Officials (NACTO) is a coalition of America’s largest cities committed to building safe, sustainable transportation systems and active cities through better street design and transportation policy. NACTO has established itself as a leader in changing the way our streets operate for people… More
Silva Cells and On-Structure Installations The DeepRoot Silva Cell system has been installed in dozens of rooftop and on-structure projects around the world. Whether on top of existing structures — such as parking garages — or a garden terrace atop a new construction project, Silva Cells can help create structure as well as bioretention for… More
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