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Water enters joints between solid concrete pavers and flows through an "open-graded" base, i.e. crushed stone layers with no small or fine particles.

The void spaces among the crushed stones store water and infiltrate it back into the soil subgrade. The stones in the joints provide 100% surface permeability and the base filters stormwater and reduces pollutants.

This type of pavement is an important component in low impact development, a process that attempts to minimize impacts on water quality.

Hardscapes USA manufactures several permeable paving units that help deal with the problems associated with water runoff from paved surfaces:

• SF-Rima
• Belgian Cobble
• Percstone
• Octabrick

Each of these concrete pavers helps control the volume of runoff from precipitation, which causes serious erosion and siltation in streams and other bodies of waters.