South Philly gets a street that will drink up water

One South Philadelphia street just got a little greener ― though you might not be able to tell just by looking at it.

The asphalt of the 800 block of South Percy Street appears as black as ever. But underneath the surface is a whole different story.

The Water and Streets departments are using it to pilot a new initiative to make Philadelphia’s streets porous.

During a rain storm, water will seep through the asphalt ― rather than running into the nearest storm inlet and into the city’s rivers ― and soak into a layer of stone. Over time, water will slowly soak from the stone into surrounding soil.

“This is a new green street ― notwithstanding its color,” Mayor Nutter said at a press conference Tuesday afternoon.

This is just one initiative of a 25-year plan that the Water Department has rolled out called Green City, Clean Waters, which aims at reducing stormwater runoff to meet federally mandated pollution targets.

Like many older cities, much of Philadelphia is served by a combined sewer system, in which household waste and stormwater run into the same pipes. During a big rainstorm, those pipes overflow into rivers.

This street ― as well as other Water Department initiatives, like constructing swales and handing out rain barrels ― is meant to divert water from the sewer system to prevent that from happening.