The 800 block of Percy Street is Philadelphia’s first porous street. The street allows water to be absorbed directly into the pavement and will reduce the amount of water directed to the storm sewers.
“ … potentially mitigate the impact of ice on city streets following winter storms. “ by allowing road salt to soak into the street and not get dumped into rivers and streams.
“ … eliminating stormwater runoff from the site. Porous asphalt is as structurally strong as conventional asphalt, … provides temporary storage for water as it slowly soaks into the ground. …”
Philadelphia’s long term goal is to have hundreds of miles of porous asphalts streets in the future.
Via: City of Philadelphia LINK