Measures for heat stress reduction by evaporative cooling:
Due to climate change and increasingly hot days, so-called urban heat islands are being created in the city due to large-scale sealed and highly dense urban structures with poor vegetation cover (urban-heat-island effect). Water which evaporates cools the microclimate. Measures that do not drain rainwater away but store it for a longer period of time so that it can evaporate during heat periods are therefore favourable.
Humid soils, wet vegetation, irrigated facades and trees that are well supplied with water have the highest evaporation values and therefore cool best. Intelligent technologies and processes for decentralised rainwater management can, in combination with other measures, contribute to a healthy urban climate and heat prediction. They also contribute to a near-natural water balance and serve to prevent flooding, but are not yet common practice.