How do you mitigate the flood risk in a basement. Sewer malfuntioning, heavy rain, but also firefighters flooding your burning house? I would think (no numbers

How do you mitigate the flood risk in a basement. Sewer malfuntioning, heavy rain, but also firefighters flooding your burning house? I would think (no numbers to back it up) for most houses the risk of flooding is higher that the risk of burning down