Permeable Surfaces

This infographic explains the new green techniques that will revise the way Philadelphia catches and processes stormwater.
Aug 31, 2011   OnEarth Magazine
<p>As part of a plan to utilize the city's rainwater and recycle it back to lake Michigan, Chicago has been renovating its 13,00 alleys to become permeable surfaces, where rainwater can soak back into the ground. 40 alleys have been redone so far.</p>
Jun 30, 2008   CNN