Nature-based solution in urban drainage: Opportunities and challenges of porous paving

Urban areas are increasingly challenged by pluvial flooding, driven by climate change and the expansion of impervious surfaces. Conventional sewer systems often lack the capacity to manage increased volumes of stormwater, resulting in water spills in the lowest floors of buildings, retention of water on the ground and potential contamination. Implementing nature-based solutions, such as porous concrete pavements, supports controlled infiltration and retention of stormwater, thereby reducing peak flows, lowering runoff volumes, and improving infrastructure durability. The integration of nature-inspired solutions and gray infrastructure leads to an increased use of recycled materials for the sustainability and resilience of urban environments to flooding.