10times
30 Sep 2021Ended

Tree Pit Systems for Sustainable Stormwater Management

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upto 100
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Based on previous editions

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Sep 2021

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Abstract Tree pit systems integrate common street trees with stormwater management as a viable and sustainable alternative to traditional "end of .. Read more pipe". Tree pit systems integrate common street trees with stormwater management as a viable and sustainable alternative to traditional “end of pipe” practices in achieving volume control and nutrient reduction, as well as providing uncompacted soil for healthy and vigorous tree growth, while maintaining pavement support. Municipal and regulatory authorities encourage low impact development (LID) techniques to replicate pre-development conditions and mitigate the negative impact of land development and surface paving. Tree pit systems typically combine a precast concrete frame with an engineered soil (media) designed to collect, infiltrate and “treat”stormwater through physical, biological and chemical processes. Careful and deliberate consideration in formulating and engineering the media that comprises the tree root space must take into account the geology of existing native soils, water table, utilities, building foundations, etc. The media must be designed to bear the mechanical compaction necessary to support the weight of overlying paved surfaces as to prevent settling or subsidence without altering water holding capacity and oxygen exchange. This same media must provide other necessary properties for both trees and roots to acclimate, survive, and sustain vigorous growth.

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Toronto and Region Conservation Authority

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