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The rainfall storage and infiltration facilities of permeable pavements have been attracted attention as an improvement measure of urban environment. In this paper, experimental study makes clear that rainfall infiltration facilities of permeable pavements are strongly dependant on rainfall intensity and unsaturated zones prevent rainfall from infiltrate into the pavement. We develop the simulation method that analyze the air and seepage flow simultaneously and we demonstrate that the dependence of rainfall infiltration facilities on rainfall intensity is mainly caused by the behavior of air flow in the pavement. It is shown that the effects of permeable pavements on flood control can be evaluated accurately by using this simulation method.
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Nishiyama et al. (2007) studied this question.
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