Transboundary water management is a major global concern. In Europe, this concern has dramatically increased since catastrophic transboundary floods in the Tisza River Basin (TRB) this past decade, contrasting with water scarcity in dry periods which has led to dust storms and fires. The populations in the region’s floodplains live with a considerable degree of uncertainty and vulnerability. Another problem is that the Tisza is a transboundary basin on the border of the EU. Thus, national and regional water management strategies vary for different parts of the river. This is why the Tisza was selected as a NeWater case study.