Pervious concrete can address certain liability concerns by promoting better traction and enhanced snowmelt. Pervious pavement may also aid your quest for LEED points. Its use supports initiatives like Cool Communities and Low Impact Development. Green construction benefitsĪlthough pervious pavements have been around for decades, surging interest in green construction now drives growing demand. When water infiltrates the pavement, the need for costly retention ponds and stormwater drainage systems is reduced. Pervious pavements not only limit stormwater runoff into local lakes and waterways, they can also facilitate the recharging of local groundwater supplies. There are a variety of important environmental and safety advantages that pervious pavement offers. To minimize debris that limits permeability, avoid roof drains positioned directly above the pavement, and don't use mulch adjacent to the pervious pavement. rainfall, 28.5 inches, occurred in Smethport. Extreme rainfall is more common in the state than you might imagine. The system must be adequate to avoid flooding, erosion and other problems. Pervious concrete is the one permeable pavement option that does not always require a reservoir layer.Īlso, an accurate assessment of anticipated water volume is a must. Underdrain pipes address inadequate percolation rates. When planning a parking lot, consideration must be given to the type of application, anticipated traffic (pedestrians, cars, trucks and/or buses) and the permeability of the underlying soil.Ī subgrade percolation test is needed to determine the design of the aggregates detention base. Soil into which the water can eventually infiltrate.An underlying layer of crushed stone or gravel with sufficient spaces to collect rainwater.Pervious pavement systems typically feature three distinct layers: Although strength reduction occurs, sufficient strength remains for parking lot applications. It is possible to achieve 15 to 25 percent voids that promote water flow rates up to or even more than five gallons per square foot per minute. Quality pervious concrete requires carefully controlling water and cementitious materials (with little or no sand) to create a paste that coats the aggregates. Pervious Concrete Pavement SystemsĪs defined by the NRMCA, pervious concrete is an engineered pavement featuring interconnected voids that allow water to infiltrate and percolate right through it. The durability of pervious concrete combined with high permeability make it an ideal choice for many applications, like light-duty parking lots. Pervious concrete, pervious asphalt, permeable pavers and turf pavers are all examples. Structural methods include the use of permeable pavements that allow stormwater to seep down into the subgrade. According to the Pennsylvania Department of Environmental Protection (DEP) manual, there are both structural and non-structural methods for controlling stormwater.
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