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How Trees and Soil Improve Water Quality

We write a lot about the benefits that trees and soils have on water quality. But what, exactly, do they improve? Back in 2011, landscape Nathalie Shanstrom tackled this topic, explaining in easy-to-understand terms what we mean by when we refer to water quality improvements. While seriously impaired runoff is not a concern on most sites,… More

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Cities That are Pioneers in Developing Stormwater Credit Systems for Trees

Cities That are Pioneers in Developing Stormwater Credit Systems for Trees

Recognizing the many benefits trees provide, more and more jurisdictions are providing incentives to both preserve existing trees and plant new trees. Examples of such incentives include grants, tax rebates, development incentives, stormwater fee discounts, and stormwater credits. Today I’ll be focusing on stormwater credits for trees, particularly stormwater credits applicable to individual trees on… More

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Effects of Pavement on Tree Soil Organic Matter

One of our specialties at The Kestrel Design Group is designing urban tree systems (especially designing urban tree systems to maximize stormwater benefits). One question we are regularly asked on urban tree projects is whether or not soil organic matter will become too low or depleted when trees are surrounded by pavement and leaves are no… More

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Final Results of NCSU Stormwater Treatment Performance Monitoring

How do the stormwater benefits of Silva Cell suspended pavement tree/soil systems compare to the stormwater benefits of traditional bioretention systems? Since the mechanisms by which the tree and soil provide the stormwater benefits in these systems are the same as those in traditional bioretention, we expected the benefits to be comparable as well. The… More

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The Most Important Factor for Growing Healthy Trees

Many factors affect tree health. Are they all equally important or are some more important than others? According to Kim Coder, soil compaction is by far the biggest constraint on tree growth. In a 2007 paper, he wrote, “Soil compaction is the most prevalent of all soil constraints on shade and street tree growth…Many people… More

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New Zealand’s Ultra-Comprehensive Report on Bioretention Media

I spent a good part of last winter completing a  literature review on bioretention media for a revision to the Minnesota Stormwater Manual. So when I attended the Low Impact Development (LID) conference in St. Paul, MN earlier this month, I was very interested to learn of a recent specification coming out of New Zealand:… More

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Trees in downtown Minneapolis. Flickr credit: urbanfeel

New Tools for Using Trees for Stormwater Management in Minnesota

Randy Neprash has been a champion of using trees for urban stormwater management for longer than almost anyone else we know. A water resources engineer and stormwater regulatory specialist for Bonestroo, now Stantec, Randy is also the technical consultant for the Minnesota Cities Stormwater Coalition, an organization of about 120 Minnesota cities that are regulated… More

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Does Bioretention Still Work When the Ground Freezes? Part 2: Maximizing Bioretention Cold Climate Performance

Part 1 of this blog series summarized recent studies in Minnesota, Connecticut, New Hampshire, and King City, Ontario, which all found that the difference between summer and winter performance of bioretention systems is not substantial, even on sites with severe winters. Now that we know that, how do we go about maximizing bioretention performance in… More

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