The method of FloodGraphic graphically present location specific topographic and flood hazard data, including time-sensitive NWS watches and warnings inclusive of site-specific forecast flood depths via an array of particularly shaped and colored, site-specifically annotated, video-capable signs
The signs include vertical gradations in feet or meters in full scale presenting the elevation of the site, historic, and predicted future flood levels, specific to the location of each FG installation. FloodGraphic headquarters administers a program of information accumulation, vetting, information dissemination and management of installations.
The method achieves a standard nationwide array of warning signs.
The FloodGraphic method provides information and warning of actual past and forecast flood heights at a multiplicity of locations more effectively than any existing method by presenting data at each installation with reference to the grade level and a National Datum. No linking to or differentiation between the flood watch and flood warnings of the NWS is provided by any prior art.