Stormwater Symposium

Oral

394148 - Final Analysis Results for Performance of Philadelphia Tree Trench Green Infrastructure

Tuesday, June 5
10:30 AM - 12:00 PM
Location: Mirage Room
Co-Authors: Robert Traver, Villanova, PA – Villanova University; Cara Albright, Villanova, PA – Villanova University

Following Philadelphia’s “Green City, Green Water” initiative, this study investigated the performance of the innovative green infrastructure tree trench, which is composed of a number of tree pits embedded in an underground infiltration bed. Runoff collected from the street enters the infiltration bed (via an underdrain) and is both infiltrated into the native soil as well as utilized by the trees. Our analysis revealed that the design does not capture all rainfall volume from storms smaller than the design storm due to under-design of the underdrain pipe. Intense storms, even though the total rainfall depth is significantly smaller than the design storm, can generate overflow. Also, the tree pits are hydrologically isolated from the system probably due to clogging of the geotextile wrapping tree pits. On the other hand, the infiltration trench delivered outstanding performance. Design suggestions will also be provided in the presentation.

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394148 - Final Analysis Results for Performance of Philadelphia Tree Trench Green Infrastructure



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