Pervious concrete, a Low Impact Development method,  is characterized by high permeability which permits flow of water through its pores. It can treat storm water, regulate water runoff, recharge groundwater, and reduce pollutant transfer by catching them. It is used in areas with low traffic such as parking lots. But with time, the pervious concrete is clogged, decreasing infiltration rate of stormwater runoff.

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This study evaluated the long-term infiltration of stormwater runoff and the efficiency of different cleaning techniques. 

 

Five different pervious concrete mixtures were used to create parking spaces. During the first two years of the study, the parking lot was opened to cars to park in order to clog it. At the end of this stage, the parking lot was closed and different cleaning techniques have been tested under dry and wet conditions. Infiltration tests were run regularly and the particles collected though the different cleaning methods were analyzed.