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where the Aveper parameter is the short term averaging period (e.g. 1, 3, 8 or 24 hr or MONTH) for which the receptor table is selected, and the secondary keywords, FIRST, SECOND, etc., indicate which high values are to be summarized by receptor for that averaging period.  The RECTABLE card may be repeated for each averaging period.  For cases where the user wants the same RECTABLE options for all short term averaging periods being modeled, the input may be simplified by entering the secondary keyword ALLAVE for the Aveper parameter.  The following example will select summaries of the highest, second highest and third highest values by receptor for all averaging periods:

 

OU RECTABLE  ALLAVE  FIRST  SECOND  THIRD

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The model will also recognize a range of high values on the RECTABLE input card, and therefore the following card will have the effect:

 

OU RECTABLE  ALLAVE  FIRST‑THIRD

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     The output file will include tables for only the high values selected.  Tables for all source groups for a particular averaging period are grouped together, and the averaging periods are output in the order that they appear the CO AVERTIME card.  For each averaging period and source group combination, the tables of high values for the receptor networks (if any) are printed first, followed by any discrete Cartesian receptors, any discrete polar receptors, and any boundary receptors.

 

     The number of high values per receptor that the model can store is controlled by the NVAL PARAMETER in the Fortran computer code.  The value of NVAL is initially set at 2 for the DOS version of ISCST and 6 for the extended memory version.  The NVAL PARAMETER can be changed (up to 10), and the model recompiled in order to meet other modeling needs, such as the highest of the sixth highest values by receptor for PM‑10 modeling, assuming sufficient memory is available for the model's storage requirements.  Changing the model storage limits is discussed in more detail in Section 4.2.2.

 

     If the CO EVENTFIL keyword has been used to generate an input file for the ISCEV (EVENT) model, then the design values  identified by the RECTABLE options, e.g., the high‑second‑high 24‑hour average, are included in the events that are defined in the ISCEV model input file.

 

 

 

 

 

 

 

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