Final answer:
The likelihood of a flood similar to a past event occurring can be estimated using historical data and climatic trends, with safety measures like seeking alternate routes or waiting for waters to subside being essential during such events. The correct answer is option a. Yes
Step-by-step explanation:
When considering the potential for future floods, it is essential to understand that natural events, such as floods, do not have specific schedules but can be modeled based on historical data and climatic trends. The probability of a flood with a similar discharge to that of the event from 9/23/2009 happening again within the next 20 years can be assessed by analyzing past weather patterns, flood records, and changes in land use and climate. Regarding the case of a road being flooded, as stated in the question, it is always advisable to seek an alternate route for safety, as driving through flooded areas can be extremely dangerous.
Similarly, when encountering a swollen river due to heavy rains, it is best to wait until the waters subside before attempting to ford it. In any situation where a natural disaster such as a landslide affects roads, emergency workers might create a bypass to facilitate access and ensure safety, much like in the incident depicted in Figure 3 from the Washington Army National Guard.