Masonry Magazine October 2012 Page. 17
New rules
INCREASINGLY, municipalities are passing ordinances that mandate permeable paving in new construction for a number of reasons. Some are part of an effort to capture rainwater, so that it doesn't flow into a drainage system that combines raw sewage and stormwater, thus increasing the volume - and the cost-of sewage treatment.
In some urban areas, the ground is so blocked with impervious surfaces, such as roofs and paved sidewalks, parking lots and streets, that permeable paving is seen as one way to help recharge falling water tables.
Permeable paving also lessens water pollution and stream erosion. That's because in a permeable system, rainwater filters back into the soil, instead of carrying pollutants through storm drains to a nearby stream or river. It works to lessen erosion, because less water flowing into a stream means there is less water to overflow stream banks.
Recent developments in government, coupled with new research, will lead to the use of permeable paving for stormwater management, industry observers say.
This summer, the federal government passed the Surface Transportation Extension Act into law, which, for the first time, includes provisions for permeable paving. Many predict that the seal of approval from the U.S. Department of Transportation will fuel additional development in permeable paving.
Specifically, the law is important in two main ways. The first is that it calls for research into permeable building materials and systems that are designed to minimize environmental impacts, stormwater runoff and flooding; and ways to treat or remove pollutants by allowing stormwater to infiltrate through the pavement similar to the way it would if the pavement was not there.
The second is that it calls for a study into lifecycle costs, which is how much a particular project costs for its entire life.
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October 2012
MASONRY 15