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7.1.H. - Page 31 T'
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<br /> Maintaining Permeable Pavements
<br /> INTENDED FUNCTION AND tion as intended, however, inspection and
<br /> BENEFITS OF MAINTENANCE consequent maintenance are imperative.
<br /> Research studies and anecdotal case stud- TYPES OF PERMEABLE
<br /> ies from across the USA and the world PAVEMENTS
<br /> i have shown that permeable pavements For the purposes of this bulletin, any
<br /> substantially and significantly reduce pavement that is intended to let water pass
<br /> runoff volumes, limit peak flows, and through its surface and temporarily collect
<br /> sequester(trap)many types of pollut-
<br /> ants. Many permeable pavements further in an underlying aggregate storage zone
<br /> is termed permeable pavement. However,
<br /> improve ground water recharge, have high among this broad definition of pavement,
<br /> albedo{]fight reflectivity), reduce runoff there are several specific types. Several of
<br /> temperature, and improve aesthetics. these types are pictured in Figure 1 below.
<br /> Permeable pavements are able to achieve For specific details of each pavement
<br /> this by allowing water to pass through the type, please see AG-588-14W(Permeable
<br /> surface layer and temporarily collect in
<br /> Pavement: Research Update and Design
<br /> underlying aggregate storage layers. This Implications).
<br /> water then either is released back to the Permeable concrete(PC)is a mix-
<br /> storm drain system through underdrains tune of Portland cement,fly ash,washed
<br /> or infiltrates into the underlying soil, or a gravel, and water.Permeable asphalt(PA)
<br /> combination of both.A small fraction of consists of fine and course aggregate stone
<br /> runoff will evaporate or evapotranspire. bound by a bituminous-based binder. Water
<br /> To enable permeable pavements to func-
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<br /> Figure 1.Types of permeable pavement.Top L-R:Permeable concrete(PC),permeable asphalt(PA),
<br /> permeable interlocking concrete pavers(P1CP),Bottom L-R:concrete grid pavers(CGP),plastic rein-
<br /> forcing grids(PG)filled with gravel,and PG with grass.
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