Comparing the Hydrologic Performance of a Bioretention Cell with Predevelopment Values
Publication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 2
Abstract
Bioretention cells have been found to improve the hydrologic and water quality performance of urban impervious areas. This study recorded continuous hydrologic data from a bioretention cell in Silver Spring, Maryland, over a period of 2 years. Two evaluation methods were used to assess bioretention performance, curve number (CN) volumetric analysis, and flow-duration flow regime analysis. CN-derived Woods B and C land uses were used to analyze cell volumetric performance, and data from a nearby forested stream were used to evaluate the cell flow regime. A CN of 75 was fit to the cell outflow with relation to rainfall depth. A larger cell, from 4.5 to 8.3% of the drainage area, was required to match the CN of woods land use. Flow duration comparisons between cell outflow and forested streamflow data suggested that bioretention may not match the predevelopment hydrologic regime despite performing similarly volumetrically. The overall natural hydrologic regime, not only peak flows and flow volume, of an area should be used both as a design factor as well as a performance metric for bioretention cells and other low-impact development (LID) facilities.
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Acknowledgments
This project was partially supported by the Cooperative Institute for Coastal and Estuarine Environmental Technology, CICEET, NOAA Grant Number NA06N054190167. Appreciation is extended to the Montgomery County, Maryland, Dept. of Environmental Protection for supporting the Silver Spring bioretention site and to the USGS for providing Pond Branch stream flow and rainfall data.
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© 2013 American Society of Civil Engineers.
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Received: Jul 7, 2011
Accepted: Jul 31, 2012
Published online: Aug 7, 2012
Published in print: Feb 1, 2013
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