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Generating enhanced site topography data to improve permeable pavement performance assessment methods - presentation
Citation:
Kertesz, R. AND Dan Murray. Generating enhanced site topography data to improve permeable pavement performance assessment methods - presentation. Presented at World Environmental & Water Resources Congress (EWRI 2013), Cincinnati, OH, May 19 - 23, 2013.
Impact/Purpose:
These results may have an impact on future siting and/or construction of surface infiltration green infrastructure BMPs.
Description:
Permeable pavement surfaces are infiltration based stormwater control measures (SCM) commonly applied in parking lots to decrease impervious area and reduce runoff volume. Many are not optimally designed however, as little attention is given to draining a large enough contributing area. A parking lot located at a community college in Cincinnati, OH contains two permeable pavement (PP) cells. A high resolution topographic survey indicates that one of the cells (cell 90 [1600 sq-ft]) receives no run-on from adjacent impervious surfaces, while the other (cell 82 [2500 sq-ft]) achieves almost a 3:1 ratio of contributing area to PP area. Data indicate that flow channeling (conveyance of flow to few points of entry at PP boundary), caused by shallow lateral gradients (micro-relief perpendicular to pavement boundary) reduces the effective infiltration area of cell 82. High resolution topography data can better identify preferential paths than traditional survey data. Smart regrading practices can use this information to increase capture area while extending SCM lifetime by masking lateral flowpaths (improving cost/benefit ratio).
