concrete pavers designed with voids to be filled with quick-draining gravel
Photo Karen Bussolini
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Pervious Paving

Paving materials that incorporate small gaps allow ­water to seep through into quick-draining gravel layers underneath. This keeps the top surface dry, eliminates runoff, and lets water in the gravel layers gradually sink into the soil. There are three basic types: concrete pavers with voids in between to be filled with gravel or sand (with or without grass); porous concrete or asphalt made with little or no sand so there are built-in air pockets; and plastic grids that keep a surface layer of gravel or sand (with or without grass) from compacting, so water drains through.
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