Essentially, it's an estimate, a statistical calculation that helps the government determine floodplain maps, marking the boundary where there's a 1% chance of flooding in any single given year within ...

The areas greatest impacted by the storm received 6″-10″ of rain in around 3-4 hours. According to the NWS, this is estimated to be a 100-Year Flood — meaning each year there is about a 1% chance of ...

a statistical calculation that helps the government determine floodplain maps, marking the boundary where there's a 1% chance of flooding in any single given year within an average period of 100 ...