The video to the right shows the typical cast-in-place concrete sidewalk in front of the house during a downpour. Precipitation flows across the impervious pavement surface and collects in puddles where it cannot drain any further (see also information on the Contemporary Water Cycle).

The porous or pervious pavement, on the other hand, does not show surface flow or any puddles. All precipitation drains right away through the crevices between the pavers into the pavement base. The crevices are filled with free-draining stone chips, while the open graded stone in the pavement base stores the water in the void spaces. The water is given time to slowly infiltrate back into the soil, replenishing our baseflows and aquifers (see also the Watershed and Soil Permeability page). No runoff is generated.

For more information, refer to the data sheet.

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