Flood stages are determined by impacts to lives and/or property. USGS Streamflowĭescription: Each NWS office has defined stage heights associated to stream bankfull conditions, warning, minor, moderate, and major flood stages these thresholds are chosen in coordination with the local emergency management and stakeholder community. The basin boundaries are also shown and the shapefiles are available from the USGS. USGS streamgauges with defined stage heights associated to bankfull conditions, warning(action), minor, moderate, and major flooding. The assembly of the three datasets into a unified, consistent database contains the inherent limitations associated with each one, yet the database combines the high-resolution details from SHAVE with the broad spatial coverage and event narratives from the NWS storm reports with the automated streamflow measurements from USGS to provide a more complete depiction of flash flooding across the US.
FLASH FLOOD WARNING DC VERIFICATION
The database consists of 1) streamflow measurements operated and maintained by the US Geological Survey (USGS), 2) reports of flash flooding in the National Weather Service Storm Events Database, and 3) public survey responses about flash flood impacts collected during the Severe Hazards Analysis and Verification Experiment (SHAVE). The intention of this project is to gather and unify information about flash flooding in the US from different sources and provide the database in three different formats (i.e., comma-delimited text file, GIS shapefile, and kmz file for Google Earth™) for a variety of users who may be interested in quick-and-easy plots, detailed spatial investigations, or statistical analysis using the raw data. There isn’t a single source of information that holistically describes flash flooding.
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