Optimal Configuration of an Underdrain Delivery System for a Stormwater Infiltration Trench
Publication: Journal of Irrigation and Drainage Engineering
Volume 145, Issue 8
Abstract
Performance of a green infrastructure (GI) tree trench comprising planters, an underground rock infiltration bed, inlet structures collecting runoff, and a perforated underdrain pipe delivering water from the inlet structure into the rock bed was evaluated. Over 23 months of monitoring, the system removed 94% of the contributing rainfall primarily through infiltration; therefore, the current design achieved the design goal. The planters were found to be hydrologically isolated, so the tree trench underdrain delivery pipe and rock bed control system performance. Overflow occurred prior to the full utilization of the rock bed storage, indicating that the underdrain pipe limited inflow. Over the course of a rain event, the switch of flow control from the conduit to the pipe wall orifices reduced the maximum flow rate, generating overflow. Flow equations considering water heads variations were derived, and maximization of flow rate was presented based on the equations. The general recommendations for similar sites are to lower the delivery pipe to the bottom of rock bed and considering orifice density as the key element in design.
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Acknowledgments
The support from Philadelphia Water Department is crucially important for the success of this study and is highly appreciated, particularly the assistance from Mr. Stephen White and Mr. Chris Bergerson. The assistance from Dr. Cara Albright (Doctoral Graduate of Villanova University), who designed and set up all instrumentation is also noted and highly appreciated.
Disclaimer
This publication was developed under Assistance Agreement No. 83555601 awarded by the US Environmental Protection Agency to Villanova University. It has not been formally reviewed by USEPA. The views expressed in this document are solely those of Villanova University and do not necessarily reflect those of the Agency. USEPA does not endorse any products or commercial services mentioned in this publication.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 12, 2018
Accepted: Apr 9, 2019
Published online: Jun 5, 2019
Published in print: Aug 1, 2019
Discussion open until: Nov 5, 2019
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