KfW is helping Brazil to develop its cities in a sustainable and climate-friendly way. In doing so, the cooperation is helping to reduce climate-damaging emissions and increase the resilience of cities. Special focus is placed, amongst others, on the topic of water. KfW has commissioned DAHLEM with the provision of technical assistance for an urban drainage project in the city of Porto Alegre in Brazil. The aim is to develop a concept with measures for the reorganisation of water bodies and the drainage and management of stormwater. In addition to concept and planning consultation, the project also involves structural and design solutions that take ecological, microclimatic and socio-cultural aspects into account. An initial assessment by DAHLEM experts in an interdisciplinary and international team on site revealed that preventive flood protection in particular is urgently needed. Among other things, extreme weather conditions such as heavy rainfall caused many human casualties and a serious damage to infrastructure due to uncontrolled construction work right up to the water's edge.