For example, in the US, on an average only 36% of the time extreme rain events led to extreme river discharge. Much depended on how wet or dry was the river catchment area before the extreme rainfall. If the catchment area was wet prior to the extreme rainfall event, extreme discharge occurred much more frequently than the average, at 62% of the time. The percentage dropped sharply to a mere 13% if the catchment was dry. Clearly, soil moisture heavily influences flood response to extreme rainfall.