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An unbiased brief installation instructions from This Old House.
http://www.thisoldhouse.com/toh/how-to/intro/0,,20579725,00.html
![capture.rain_.water_.permable.paver_.driveway.creation rocks](/sites/default/files/capture.rain_.water_.permable.paver_.driveway.creation.02-pavers_size225.jpg)
Medium size rocks replace a foot of dirt, followed by a layer of small rocks, for drainage storage.
Concrete pavers have small rocks put between them, for rain water to go down into the drainage storage.
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