Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

the model if the new configuration is to be executed under an automated mode ofoperation. Given that the seamless and end-to-end integration proposed byMap2Map requires an automated mode of operation, the new input generatedthrough the integration needs to become part of HEC-RAS default settings.Next, the GDB2RASDSS application reads the HEC-RAS project file (.prjfile extension) corresponding to the HEC-RAS configuration that is to be used forsimulation and finds the current or executed by default plan file (.p# fileextension). The current plan file contains a unique combination of geometry andflow files that are used when the model is run under default settings. In general, aHEC-RAS project file contains registries for all geometry and flow filesrepresenting multiple scenarios for the same river-reach system. In the project filethere is also a registry for the current plan file that will be executed under defaultsettings. The plan file is made up of a unique combination of geometry and flowfiles describing a given river channel setup and a given flow profile going throughit. Figure 4.27 illustrates the potential combinations in a HEC-RAS projectbetween various geometry and flow files to define various plan files and how theoutput files are associated with each of the plan files simulated and stored in theproject.143