The primary difference between routine ISCST and EVENT processing is in the treatment of source group contributions. The ISCST model treats the source groups independently.  The EVENT model is designed to provide source contributions to particular events, such as the design concentrations determined from ISCST, or user specified events.  The user may specify the "events" to process using the EVent pathway, which lists specific combinations of receptor location, source group, and averaging period.  By specifying the EVENTFIL keyword, an input runstream file will be generated that can be used directly with the EVENT model.  The events included in the generated EVENT model input file are the design concentrations defined by the RECTABLE keyword and the threshold violations identified by the MAXIFILE keyword on the OU pathway.  If more than one output type (CONC, DEPOS, DDEP, and/or WDEP) is selected for the ISCST model, only the events associated with the first output type, in the order stated above, will be included in the EVENT model input file.  This is because the EVENT model can only process one type of output at a time.

 3.2.10 The Model Re‑start Capability

     The ISCST model has an optional capability to store intermediate results into an unformatted file, so that the model run can be continued later in case of a power failure or a user interrupt.  This re‑start option is controlled by the SAVEFILE and INITFILE keywords on the CO pathway.  The syntax and type of these keywords are summarized below:


CO SAVEFILE  (Savfil)  (Dayinc)  (Savfl2)



Optional, Non‑repeatable

     The SAVEFILE keyword instructs the model to save the intermediate results to a file, and controls the save options. All three parameters for this keyword are optional.  If the user specifies only the Savfil parameter, then the intermediate results are saved to the same file (and overwritten) each time. If the user specifies both the Savfil and the Savfl2 parameters, then the model alternates between the two files for storing intermediate results.  The latter approach requires additional disk space to handle two storage files.  However, selecting two files avoids the potential problem that the power failure or interrupt might occur while the temporary file is open and the intermediate results are being copied to it.  In such a case, the temporary results file would be lost.


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