Porous Paving
Low-cost porous paving materials and installation such as porous aggregate and recycled concrete sidewalk chunks or bricks are covered in Porous Paving by Bruce K. Ferguson and Rainwater Harvesting for Drylands, Volume 2, but for higher-traffic areas, or those where local codes require more durable or tested materials a few of the product options are listed below:
Plastic geocells
Invisible Structures, Inc.
Manufacturers of Gravelpave2 and Grasspave
www.invisiblestructures.com
Presto Products
Manufacturers of Geoblock
www.prestogeo.com
Open-jointed paving blocks
UNI-Group U.S.A.
Uni Eco-Stone permeable pavers
www.uni-groupusa.org