Multifunctional infiltration throughts in the city

Cities are currently experiencing above-average growth. As a result, many urban centers are experiencing very high levels of redensification, the development of new construction areas and a significant reduction in inner-city green spaces. In parallel, climate change is increasing the frequency, duration and intensity of extreme weather events such as heavy rainfall and droughts. This poses a major challenge to stormwater management from a water management perspective. Habitats typical of settlements are also being pushed back more and more, which has a negative impact on biodiversity in settlement areas. Greened surface infiltration swales are considered to be particularly promising for the near-natural management of precipitation runoff in urban areas. Infiltration swales perform the function of regulated drainage of runoff from sealed surfaces such as roads and roofs but also the retention of their pollutants to protect groundwater. However, in order to maintain the infiltration capacity, the vegetated soil zone only has a low humus and clay content. For this reason, they are usually greened by a low-maintenance lawn seed, which receives little recognition from the point of view of biodiversity and for integration in the settlement area and is little prepared for stress loads caused by waterlogging and hot spells.