Large Floods in the United States; Where They Happen and Why

This USGS report shows that the locations of the country's largest floods are related to regional climatology, topography, and basin size. Using USGS flow data, the report's authors determined that the general northward trend of decreasing atmospheric moisture, the location's proximity to oceanic moisture sources such as the Pacific Ocean and the Gulf of Mexico, and the orientation of topographic features all play a role in determining where the nation's largest floods will occur.