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Stopping Water Pollution in its Tracks: Nitrogen, Phosphorous, and the case for stormwater management

Water pollution is a serious problem worldwide, whether in rivers and lakes or massive oceans. After the famous Cuyahoga River fire of 1969, environmental regulations were put into place in the U.S. which have helped curb the amount of pollutants we put into our water and reversed some, but not all, of the problems stemming... More

Miller Park in Downtown Chattanooga Invests in the Health and Longevity of its Trees
Silva Cell Case Study

The redesigned, two acre, Miller Park features a new stage, 77 trees, a central lawn, beautifully paved plazas, granite structures and café seating. The new park serves as a gathering space for all to enjoy with plenty of space to play and relax. The park also serves as a green festival venue for concerts, farmers... More

13 Simple Steps to Evaluate Trees

There are now dozens of open-source tree maps in communities worldwide. The most successful mapping projects are those that provide citizen scientists with simple guides on how to accurately identify tree species and assess tree health. The more accurate the information on the tree maps, the more accurate the green infrastructure calculations they produce – and the... More

Treating Hydrocarbons with Green Infrastructure

I’ve always believed in nature’s processes to manage compounds in the environment. Even as a young undergraduate engineer, I often wondered why we were removing natural systems like trees and soil rather than working with them, why we weren’t protecting and bolstering those systems in ways that enhanced their natural mitigating processes. The (relatively) recent... More

Long-Term Use of Bioretention for Heavy Metals Removal

Bioretention has been shown to effectively remove heavy metals from stormwater runoff, which makes it a very useful design tool. However, there are two common concerns related to long term use of bioretention for heavy metals removal: (1) When will breakthrough occur, i.e. when will the binding sites be saturated so that dissolved heavy metals... More

Tree Roots Improve Soil Infiltration Rates

As discussed in previous blogs, tree and soil provide stormwater benefits in many different ways: Cleansing:  Trees clean stormwater through many different mechanisms, including filtration, adsorption, and plant uptake. Interception: Interception is the amount of rainfall temporarily held on tree leaves and stem surfaces. This rain then drips from leaf surfaces and flows down the... More

Writing Bullet Proof Resistant Soil Specifications

Writing Bullet Proof Resistant Soil Specifications By Howard Stenn, Stenn Design Soil specifications with unnecessary, contradictory or unverifiable standards are an invitation for plant and drainage problems, project delays, and ensuing conflicts over responsibility. Problematic provisions often accumulate in office specifications—added for a particular project or not removed when a divergent section is added –and... More

Tree Growth Tested in Silva Cells for 5 Years

Hadlow College/University of Greenwich Case Study At DeepRoot we love to see results. Proven, tested, and validated. A recent study was completed at the University of Greenwich, Hadlow College by Duncan Goodwin. The study planted several trees in different growing conditions and monitored their growth for 5 years. While formal results of the tests will... More

The Importance of Soil Structure

Soil structure (how soil particles are held together to form larger structures within the soil) is recognized as an important property of a healthy soil. Grading, tilling, soil compaction and screening soils during the soil processing and mixing process damages structure.  To counteract the loss of structure, specifiers then add to it, utilizing a mined... More

Specifying Compost: How to Get Quality Compost and Avoid Unnecessary Complications

Over the past 20 years compost has become a standard amendment for landscape site soils and topsoil mixes, but specifications are far from standardized. While regional and project-specific conditions require variation in compost quality, there are basic parameters that every compost should meet for use in landscapes. There are also some common provisions that should... More