Monday, June 27, 2011
On This Topic
RUNOFF IN A NUTSHELL—AND HOW PHILLY IS TACKLING IT. The city of Philadelphia, which gets its drinking water from the rivers that flow through it, is combatting runoff with green infrastructure, including rain gardens, green roofs, treescapes, and porous pavements.
GREEN DRIVEWAY EXAMPLES. The driveway in the top photo, located in Cleveland, Texas, looks just like a lawn, but is created with a plastic paving grid to provide support for vehicles. The one in the bottom photo, located in Isthmus, Wisconsin, mixes a plastic paving grid for the center and side grassy areas with permeable paving blocks. (Photos courtesy ofInvisible Structures, maker of the plastic grid product featured here.)
PERMEABLE PAVING BLOCKS UP CLOSE. The cut corners of these blocks provide room for gravel, through which water can drain. Permeable paving blocks come in a wide variety of styles.