Conference Agenda

Low impact development (LID) technologies, such as permeable pavements and bioretention systems, have been proven effective in promoting infiltration and preventing excessive urban runoff. However, the sustainability of such technologies under extreme weather remains underexplored. In response, an extreme weather exposure assessment of LIDs in the major cities of South Korea was done through climate modelling and developing an exposure index (EI). Quantile mapping was conducted to bias-correct extreme weather projection data, which were utilized for the development of the EI. Bias-corrected projections revealed significant rainfall-related extremes, with days with precipitation ≥ 20 mm increasing under the SSP5-8.5 scenario, peaking at 37 days in Incheon by late-century. Meanwhile, projections on the annual maximum value of daily maximum precipitation showed mixed trends, with significant increases in Seoul. Temperature extremes, including yearly maximum daily maximum temperature (TXx) and heat wave days, increased, particularly under SSP5-8.5, while cold wave days declined. Seoul recorded the highest EI for permeable pavements at 0.616 under SSP5-8.5. Moreover, high bioretention EIs were found in Daegu at 0.377 under SSP5-8.5, emphasizing the need for resilient LID designs to address growing climate variability in urban areas.