A 240-year-old market glows with resilient green infrastructure and people-centric design Richmond, Virginia’s 17th Street Farmers Market is the oldest of its kind in the nation, declared a public market in 1779. (Though some accounts claim it started unofficially as early as 1737). As commerce grew, so did the market, and in 1854 a building… More
Silva Cells were originally developed to provide adequate tree rooting volumes even in areas dominated by pavement. They do this by extending rootable soil volume under HS20 load bearing surfaces. These rootable tree volumes and the large trees that root in them are also an efficient sustainable stormwater management system. Sometimes people ask us if… More
Significant portions of compost are an essential part of many bioretention and other green infrastructure soils. Compost is a beneficial complement to the largely inert aggregate used to provide rapid infiltration in these mixes: It stores significant moisture—reducing peak and total flows, has a high capacity to trap nutrients and contaminants, and boosts the biological… More
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
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
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
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
The City of Toronto has been a pioneer for important public policy initiatives such as one of the first Municipal Soil Volume Standards for street trees, a ground breaking Best Practices Manual for Hardscape Street Tree Planting. All of this was done through a cross departmental collaborative approach, and began with the Queensway project, which… More
Over 20 years ago, the City of Del Mar along the southern California coastline began a citywide process to improve streetscapes with the intention to preserve and enhance the tangible qualities of the community. In 2019, construction began of the downtown streetscape portion, which will bring these concepts to fruition, building up the commercial center of… More
Over the last several years, DeepRoot has written about reusing urban soils as a planting medium. To date, the following have been covered via the DeepRoot blog: Reusing Existing Urban Soil for Planting Urban Soil Assessment and Reuse: Part 1 and Part 2 Search for the “Perfect” Soil Specification The articles above create a basis… More
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