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Ecosystem-based adaptation and green infrastructure are in many cases key part of a cost-effective way to deal with scenario uncertainty by delaying or avoiding lock-in to classical infrastructure-building water management to provide safety while providing manifold co-benefits for the environment (e.g. environmental objectives of the WFD) and the different water-using sectors (EEA 2012b; OECD 2013). To overcome the bottlenecks for the implementation of measures working with natural processes, the flexibility of the measures needs to be mentioned. These measures, contrary to most hard defences and engineering works can be adapted with progressive insights. Even when each case is unique and other pressures and key stakeholders are involved, there are many lessons to learn from projects already implemented. Therefore, additional guidelines and examples of successes and failures are recommended.