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flash flooding, geomorphological parameters were derived from the National Elevation Dataset (NED; http://ned.usgs.gov/ ) digital elevation model (DEM) across the CONUS. To ensure compatibility between DEM-based flow accumulations and the actual river network, flow accumulation and direction was extracted by delineating basins with USGS stations, and the National Hydrography Dataset (NHD; http://nhd.usgs.gov/ ) was used to resample the 30-m DEM to a 1-km grid. The geomorphologic parameters for
flash flooding, geomorphological parameters were derived from the National Elevation Dataset (NED; http://ned.usgs.gov/ ) digital elevation model (DEM) across the CONUS. To ensure compatibility between DEM-based flow accumulations and the actual river network, flow accumulation and direction was extracted by delineating basins with USGS stations, and the National Hydrography Dataset (NHD; http://nhd.usgs.gov/ ) was used to resample the 30-m DEM to a 1-km grid. The geomorphologic parameters for
