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I still question whether they are better than just having trough's or channel drains installed dumping into underground dry wells I've seen this done where large concrete pipes or plastic centipedes are installed under the parking lot and all the storm drains dump into them.
On another note, I once knew a man who was a civil engineer and did a lot with septic design and hazardous materials. He told me about a certain kind of anaerobic bacteria they inject into contaminated sites that eat oil....imagine the 'green hugs' you would get for installing a 'oil eating' stone base under the pavers to not only catch the run-off, but clean it as well.
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