Final answer:
Flooding's probability can be estimated using flood recurrence intervals, which is like calculating the odds of rolling a specific number on dice, and does not dictate when floods will occur.
Step-by-step explanation:
Flooding is a significant issue affecting various regions and studying flood recurrence intervals helps us understand the probability of flood events. These intervals do not predict exact timings but give us an estimated chance of such events occurring in any given year. The question of whether a flood with a similar discharge to that of the event from 9/23/2009 could happen again in the next 20 years can be approached by understanding these probabilities. Similarly, to answer which dated flood events are expected to happen more often, one must consider frequency and not specific dates. Knowledge of the flood recurrence intervals and the information provided by weather records can guide us in assessing the likelihood of future floods.