A resilient development of river basins faces increasing water-borne challenges such as securing water quality and provision, mitigating the effects of droughts, and protecting against flooding. Nature-based solutions, understood as actions which are inspired by, supported by, or copied from nature, can help societies address ecological, social and economic challenges in sustainable ways (European Commission, 2015). Examples of nature-based solutions are the restoration of floodplains and wetlands, the transformation of arable land into grasslands, and cooperation agreements with land users to enhance ecosystem services delivery. The effects of nature-based solutions include an enhanced resilience against flooding or drought, improved water quality, nutrients and greenhouse gas retention, enhanced human health and well-being, and the safeguarding of species and habitats. Nature-based solutions are often more cost-effective than technical alternatives.