driveway, sidewalk) or covered by a hard, difficult-to-penetrate material such as concrete, stone, brick, or asphalt. Impervious surfaces are surfaces that allow little or no stormwater infiltration into the ground. Permeable surfaces (also known as porous or pervious surfaces) allow water to percolate into the soil to filter out pollutants and recharge the water table. A classic example of an impervious surface is paving, utilized to make roads and parking lots all over the world. If you are not familiar with the term "impervious surface," this picture will help explain it. Impervious space is typically asphalted or concreted surface. Such surfaces are those that can be thoroughly and repeatedly cleaned and disinfected, will not retain odors, and from which fluids bead up and run off or can be removed without their being absorbed into the surface material." Roofing and other building materials are also classically impervious. While the Commission is allocated to the Department of Environmental Protection, it has its own independent statutory authority and regulations. If someone is impervious to something,they are not…. As cities grow and more development occurs, the natural landscape is replaced by roads, buildings, housing developments, and parking lots. An impervious surface is a hard area that doesn’t allow water to seep into the ground. It affects storm water handling and ground saturation capabilities. 7:45-1.3 when the Commission’s regulations were amended in 2009. Impervious surface is defined by 9 CFR 1.1 to mean "a surface that does not permit the absorption of fluids. An impervious surface is any surface that is either paved (i.e. Most commercial properties have to meet very specific zoning requirements as to how much of the surface can be covered with impervious material. Learn more. Instead, the water runs off the impervious surface, picking up many types of pollution in the process, and then flows into a storm drain or a nearby body of water. The definition of impervious is not being able to be penetrated or not able to be hurt. What does impervious mean? Impervious surfaces and flooding. Also, soil compacted by years of urban development qualifies as an impervious surface. This is why a church parking lot might be 1/2 asphalted and 1/2 gravel. Graveled surfaces were specifically included in the definition of “impervious surface” at N.J.A.C. An impervious surface is a surface which cannot be penetrated by water. Other than exposed natural rock croppings, impervious surfaces are completely human-created and are an unnatural part of most ecosystems.. Impervious surfaces are the main contributor to excess stormwater runoff that would otherwise have been retained on site in natural forests or meadows. impervious meaning: 1. not allowing liquid to go through: 2. 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