Rivers typically flow through multiple flood-protected areas which are clearly interconnected,
as risk reduction measures taken at one area, eg, heightening dikes or building flood
storage areas, affect risk elsewhere. We call these interconnections 'hydraulic interactions'.
The current approach to flood risk management, however, neglects hydraulic interactions for
two reasons: They are uncertain and, furthermore, considering them would require the
design of policies not only striving for risk reduction, but also accounting for risk transfers …