Impact of Soil Type in Strategy for Green Infrastructure Planning as Nature-Based Solutions to Mitigate Urban Flash Flood

Due to the growing socio-economic and rapid urbanization, urban flooding has become more frequent and severe, especially in developing cities. Despite the urban green infrastructures being well-known as effective nature base solutions in alleviating stormwater runoff, there is comparatively little research for planners and designers to adapt proper soil type to enhance flooding mitigation via urban green space. This study explores the soil type on the strategy for green infrastructure planning as nature-based solutions to mitigate urban flooding. First, the study measures the infiltration and soil classification of seven field sites in green urban in Thu Duc City. Second, the initial abstraction and the poinding time were estimated by overlaying between rainfall hyetograph and infiltration rate curves. The results can show soil type's impact on green infrastructure planning strategy as nature-based solutions to mitigate urban flooding. The soil with less than 10% clay content is proper for green infrastructure to enhance stormwater runoff reduction and groundwater recharge.