2. Challenges to flood event
attribution
We argue that two main challenges limit our capacity to accurately
attribute river flood events (Fig. 2): 1) Extreme flooding relates to
the triggering precipitation event in highly non-linearly ways, because
of the mediating hydrological and hydrodynamic processes. 2) Changes to
the hydrological systems have occurred during the period of climate
change, adding their influence on the occurrence of floods. These
changes include natural and human changes in land cover, other human
hydrological interventions, and the geomorphic responses of the river
channel. In this section we examine these two challenges.