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We have to remember also the conditions in which the pavers are laid in relation to grades. I have seen these pavers laid on a 3% slope pitched one way! Tell me how much water are you going to carry before it runs out the bottom of the grade?
Every installation design I have seen has the proper base and surface course, of course all that I have seen are in the public sector so they have proper engineering, and sub drainage under them. The sub drainage may be restricted to delay the outflow so the storm system can handel the flow.
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