The utilization of porous pavement in parking lots and other applications where stormwater detention is required provides a control strategy capable of mitigating the detrimental aspects of urban runoff. A study of porous and conventional pavement systems in Austin, Texas was undertaken, the objectives of which were: (1) review of past experience with porous pavements, (2) development of a mix design and construction specifications for a porous asphalt concrete system and construction of a porous asphalt parking lot, (3) performance evaluation of porous and non-porous pavements, and (4) development of a design methodology for porous pavement stormwater storage systems. The report includes details of pre-construction planning, construction and post-construction testing. Each study pavement was instrumented for climatic, hydraulic and water quality sampling. Observed pavement discharge hydrographs were compared with those simulated using a revised version of PORPAV, a computer program which models the stormwater hydraulics of a porous pavement facility.