The Runoff Issue

Rainwater that washes over most paved surfaces, including many concrete pavers, has been known to cause downstream erosion and strain municipal sewer systems. But permeable interlocking pavers eliminate runoff. These pavers have extra-wide joints or molded-in drain holes so that water can flow directly into the soil, which recharges groundwater and traps contaminants. The pavers do require an extra-thick base of carefully graded crushed stone for optimal drainage, so installation is more complicated and expensive. But there's a bonus: no puddles!
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