Greetings @kennyroy. I don't know the specific case of Qatar, I know that last year it suffered floods, this year I don't know. In any case, I take this opportunity to emphasize that these permeable pavements are measures to mitigate climate change, not to avoid it. In the case of low or moderate rainfall they will work effectively, but if the flow is very high, obviously flooding will occur but less than what would have occurred doing nothing. And the problem is not being corrected from the cause, this would really be solved by changing many human practices in favor of reducing the production of CO2 in the environment, so if the real cause would be attacked, but meanwhile mitigation measures are important to avoid as far as possible human and material losses ... thanks for sharing your comment.
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Perfect explanation! Good answer... (^_^)