Decision making by flood risk managers is challenged by uncertainty and changing climate risk profiles that have elements of deep uncertainty.• Flood risk managers at a regional level in New Zealand requested better understanding and tools for decision making under conditions of uncertainty and changing conditions. • A game was used to catalyze a process of new knowledge transfer and its uptake in technical assessments and decision making processes. • The understanding enabled DAPP to be used to develop a long-term plan that can accommodate changes in flood frequency from climate change (as projected in three climate change scenarios) over at least 100 years. • Use of "new" economic tools with DAPP facilitated decision making to consider the sensitivity of alternative policies to a range of climate change scenarios, to discount rate, decision review date, and costs and losses, thus addressing deep uncertainty by considering the long-term effects of initial decisions to changing conditions.The original version of this chapter was revised: Author affiliations have been updated. The correction to this chapter can be found at https://doi.

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