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Wnen ever I tried to find similar info I have come up short. There are reports on specific projects, but the ones that I have seen are pretty cyptic about how they derived their 'c' values. They seem to always hide the math and then tell you it is site specific based on the perc rate of the subsoil and the base material used. I have yet to find one that breaks it down so that you could come up with a 'c' based on your own subsoil and base material.
Ideal Concrete has been using data from a big project that was either out on Long Island or in Connecticut to help market a pervious paver product called "ecostone".
You might want to call the manufacturers and their sales reps.
If you find any good info, please share it with us.
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