It’s all about runoff. When precipitation from rain or snowmelt flows over the ground, impervious surfaces like streets and sidewalks keep the water from naturally soaking in, creating stormwater runoff. This can be problematic on several levels. Runoff erodes rivers and streams, and causes flooding.
MoreMayor Nutter announced his plans for making Philadelphia the “greenest” city in America last month, highlighting five areas of interest and 150 initiatives he hopes to achieve by 2015. He has defined the ambitious plan as a restructuring of Philadelphia towards a “green economy,” which, if it lives up to its alternate meanings, could definitely
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