Materials such as gravel, crushed stone, open paving blocks or pervious paving blocks minimize runoff and increase filtration for driveways, parking areas, walkways, and patios. Some pervious paving options can retain turf and carry autos and trucks evenly without creating tracks or other signs of heavy traffic wear.
Many pervious surfaces that receive vehicle traffic require a clay-type roadbase subgrade. The roadbase material could slow water percolation in heavy rains and cause over-saturation above it, leading to puddles or runoff. It is best to select a pervious paving material that can use the most porous sub-base. Take care during installation to minimize excessive soil compaction.
A turf-covered pervious surface can be problematic for high-heeled shoes, and can stay wetter after rains because of grass heights. A compromise approach is to retain a small impervious walkway next to vehicle loading and unloading areas.
Pervious materials may cost more than asphalt, possibly less than concrete. However, higher costs can be recovered in areas with underground utilities because pervious materials are easier to remove and replace than asphalt. Pavement replacement is simplified, and expensive measures such as asphalt cutting and patching are eliminated.
Recycled content pavers, blocks, and soil stabilization products are available in Texas and are recommended for use. |