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A Comparative Analysis of Conventional and Stormwater Street Tree Pits for Stormwater Management in Urban Environments.

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LID practices that slow down, store, treat, and infiltrate runoff require space -- a luxury not often available on highly-developed sites or in urban public rights-of-way. While working to incorporate LID BMPs into the ultra-urban areas of our watershed, the Charles River Watershed Association sought ways to retrofit existing urban green space for stormwater, without sacrificing its aesthic and public health benefits. In many of Boston's denser neighborhoods, the only existing green space abuts streets and roadways. This study investigated stormwater tree pits (a.k.a. tree box filters, tree boxes), no larger than common tree pits, to determine whether they made a tangible contribution to stormwater management.

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