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     For a technical description of the "lower bound" option, the reader is referred to Section 1.1.5.3 of Volume II.

3.3.4 Using Variable Emission Rates

     The ISC models provide the option of specifying variable emission rate factors for individual sources or for groups of sources.  The factors may vary on different time scales, such as by season, hour‑of‑day, etc.  Since the Short Term and Long Term models work on different averaging periods, the variable  emission rate factors are somewhat different.  Therefore the models are discussed separately.  See Section 3.3.8 for ISCST. 

3.3.4.1 Short Term Model Options.

     The EMISFACT keyword provides the user the option of specifying variable emission rate factors for sources modeled by the Short Term model.  The syntax, type and order of this keyword are summarized below:

Syntax:

SO EMISFACT  Srcid (or Srcrng)  Qflag Qfact(i),i=1,n

Type:

Optional, Repeatable

Order:

Must follow the LOCATION card for each source input

where the Srcid parameter is the same source ID that was entered on the LOCATION card for a particular source.  The user also has the option of using the Srcrng parameter for specifying a range of sources for which the emission rate factors apply, instead of identifying a single source.  This is accomplished by two source ID character strings separated by a dash, e.g., STACK1‑STACK10.  The use of the Srcrng parameter is explained in more detail in Section 3.3.3 above for the BUILDHGT keyword.

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