A case study: Evaluation of water storage capacity in permeable block pavement

In every city, low-volume roads and parking lots are composed of dense-graded pavements that increase storm-water runoff; however, urban flooding problems can be prevented if an appropriate pavement system is achieved. One preferable solution to this problem for low volume roads and parking lots is to use permeable interlocking block pavement. To determine the storage capacity of this kind of pavement, a series of material property tests were performed such as specific gravity, void ratios, and porosity etc., which was further used to calculate the water storage capacity of the pavement. And rainfall simulation tests were performed to evaluate surface runoff, delay time, storage capacity, and outflows over two hours. A regression analysis showed that the water storage capacity measurement from rain simulation tests agreed with the storage capacity calculation depending on laboratory materials-properties tests, based on their high correlation and coefficient values, each within the 95% confidence interval.