Hydraulic Performance of Fully Permeable Highway Shoulder for Storm Water Runoff Management
Publication: Journal of Environmental Engineering
Volume 138, Issue 7
Abstract
This paper summarizes the results of numerous simulations to assess the hydraulic performance of fully permeable highway shoulder retrofits designed to capture all the rainfall runoff falling onto conventional highway surface pavements. The simulations were performed using commercially available HYDRUS software that uses unsaturated flow theory. The hydraulic properties of subgrade soil and pavement materials were measured in the laboratory and used as input for numerical simulation. The simulations were performed for three rainfall regions in California representing high, medium, and low annual rainfall events. The simulations were performed based on 24-h actual rainfall data using 2-, 50-, and 100-year storm recurrences to determine the critical thickness of aggregate needed to capture the highway runoff volume without surface ponding and/or overflow. Sensitivity analyses were performed to evaluate the influence of material, hydrologic, and geometric factors on the critical aggregate base thickness. Results indicated that an aggregate depth of about 1.5 m was adequate for most California areas with two-lane highways. Sensitivity analyses also revealed that the saturated hydraulic conductivity () of the subgrade soil is the most important parameter to be considered in the design of fully permeable pavements, with a minimum effective allowable value of approximately .
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Acknowledgment and Disclaimer
This research was supported by the California Department of Transportation Division of Environmental Analysis through agreement number 43A0247 and the support is gratefully acknowledged. The results presented do not represent any standard or specification of the California Department of Transportation or Federal Highway Administration, and the opinions expressed are those of the authors alone. The authors thank the staff of the University of California Pavement Research Center for their assistance with laboratory testing.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 138 • Issue 7 • July 2012
Pages: 711 - 722
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 12, 2011
Accepted: Dec 16, 2011
Published online: Jun 15, 2012
Published in print: Jul 1, 2012
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