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� 1�V V � �
<br /> �
<br /> Maintaining Permeable Pavements
<br /> �$� INTENDED FUNCTION AND tion as intended, however, inspection and
<br /> �� BENEFITS OF MAlNTENANCE consequent maintenance are imperative.
<br /> . �;'
<br /> ; � _ Research studies and anecdotal case stud- TYPES OF PERME�'IB�E
<br /> ,N; ies from across the USA and the world pAVEMENTS
<br /> �
<br /> have shown that permeable pavements
<br /> substantially and significantly reduce For the purposes of this bulletin, any
<br /> �' � � pavement that is intended to let water pass
<br /> runoffvolumes, limit peak flows, and through its surface and temporarily collect
<br /> sequester(trap)many types of pollut- in an underlying aggregate storage zone
<br /> � ants. Many permeable pavements further
<br /> � is termed permeable pavement. However,
<br /> ; �Q improve ground water recharge, have high
<br /> ', �� albedo (light reflectivity), reduce runoff among this broad definition of pavement,
<br /> ��' temperature, and improve aesthetics. �ere are several specific types. Several of
<br /> Permeable pavements are able to achieve these types are pictured in Figure 1 below.
<br /> For specific details of each pavement
<br /> this by allowing water to pass through the �,pe,please see AG-588-14W(Permeable
<br /> surface layer and temporarily collect in pavement: Research Update and Design
<br /> � underlying aggregate storage layers. This Implications).
<br /> ����� water then either is released back to the
<br /> �;��� Permeable concrete(PC)is a mix-
<br /> ,� storm drain system through underdrains �re of Portland cement,fly ash,washed
<br /> �`s or infiltrates into the underlying soil, or a
<br /> � combination of both.A small fraction of gravel, and water.Permeable asphalt(PA)
<br /> runoff will evaporate or evapotranspire. consists of fine and course aggregate stone
<br /> To enable ermeable avements to fiinc- bound by a bituminous-based binder. Water
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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(PICP).Bottom L-R:concrete grid pavers(CGP),plastic rein-
<br /> forcing grids(PG)filled with gravel,and PG with grass.
<br />
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