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

20MIN, 30MIN, 1HOUR, 2HOUR, 3HOUR, 4HOUR, 6HOUR, 8HOUR, and12HOUR data intervals.If the block length is a day, the starting date must be the beginning of thatday: 24MAR1982 for a block length covering March 24. Used for 1MIN, 2MIN,3MIN, 4MIN, 5MIN, and 10MIN data intervals.In practice, the time interval (Part E) defines the block length and in turn,the block length defines the format of the valid starting date (Part D). That is, PartE determines the format of Part D. This means that for a 10MIN dataset coveringa period of 6 days there are 6 blocks of data (6 pathnames in DSS catalog). Tosome extent the HEC-DSS system might be considered a “time series blockmodel” and not a truly sequential time series model.Part F: This part relates to a unique descriptor of the data’s origin.Examples of this part might be the simulated scenario or plan that generated thedata, the name of the model run that generated the values, or the nature of the data(observed, simulated, and recorded, etc.).Taking advantage of the library and consideration for all the issuesaforementioned, an application (GDB2HMSDSS script tool) was developed in theVisual Basic 6.0 programming language and included as part of the Map2Mapworkflow. This tool also relies on the HEC Library of FORTRAN functions andsubroutines for time series data exchange (heclib50.dll, i.e., heclib version 5.0)containing all the functions needed for access to the HEC-DSS database system.This heclib50.dll is actually the same library used by the HEC-HMS and HEC-RAS models to read and write time series and curves from and into DSS at84