Abstract
AbstractThe 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 usi...
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