Based on the information collected for development of case studies for ACRP 02-64 the following general observations are made in regard to the use of permeable pavements in the airport environment: 1.The selection of permeable pavement is driven by meeting local stormwater regulatory requirements and availability of airfield land, infrastructure, or funding. The location of permeable pavement use is not based on identifying an area that is suitable but rather designing the pavement system for the location and hydrologic requirements. Subgrade infiltration is not always required. 2.Airside pavements have been designed for heavy, but infrequent, aircraft and frequent light general aviation aircraft. However, heavy aircraft loading has not been documented. 3.FAARFIELD (and LEDFAA previously) has been used for pavement thickness design, but the process needs to be validated, particularly for layer properties of the permeable surface. The underlying performance models are also for conventional pavements and need to be validated for permeable pavements. 4.Alternative funding sources were typically used (i.e., FAA funding was not involved). Some of the materials costs were higher than conventional materials, but permeable pavement was more economical overall when considering extensive storm drain systems (or land purchases) that would have been required otherwise. 5.Potential creation of FOD and maintaining permeability are two of the primary concerns with the use of permeable pavements based on industry input. Material selection and mixture design, particularly for the surface, are critical to good performance of the pavement. Periodic vacuum sweeping has appeared to maintain permeability for the pavements studied in this project.
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