Hydrologic Characterization of an Underdrained Porous Pavement
Publication: Journal of Hydrologic Engineering
Volume 21, Issue 2
Abstract
The hydrologic behavior of an underdrained porous pavement system was characterized using an effective curve number (ECN), which is synonymous to the common runoff curve number (RCN). A model previously developed for porous pavements without an underdrain, which generates the rainfall-runoff data for the system, was modified to include an underdrain. However, the addition of an underdrain adds three new parameters (drain size, drain placement height, and drain spacing) that both influence the ECN and fundamentally change the design procedure. A sensitivity analysis was completed to quantify the impacts of different rainfall depths and distributions on this modified model. The RCN equations were then fit to the rainfall-runoff data to find the ECN value. ECN values for a wide range of pavement and underdrain configurations were summarized in figures that can be used as preliminary design aids for designers and regulators. These figures can be used to estimate the ECN value for a pavement design using only the basic pavement system, soil, and drain properties. A new design procedure was also proposed that uses these figures as a tool to estimate the required size and location of the underdrains for a pavement system to have a specified design ECN.
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Acknowledgments
The authors would like to thank the anonymous reviewers for their input and suggestions which helped improve the paper. Dr. Martin would also like to thank the Glenn Department of Civil Engineering for the research and teaching assistantships which enabled this research.
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© 2015 American Society of Civil Engineers.
History
Received: May 21, 2014
Accepted: Aug 12, 2015
Published online: Oct 23, 2015
Published in print: Feb 1, 2016
Discussion open until: Mar 23, 2016
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