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     The BUILDWID keyword is used to input direction‑specific building widths for downwash analyses.  The syntax for this keyword, which is very similar to the BUILDHGT keyword, is summarized below, along with the type and order information:

Syntax:

SO BUILDWID  Srcid (or Srcrng) Dsbw(i),i=1,36   (16 for LT)

Type:

Optional, Repeatable

Order:

Must follow the LOCATION card for each source input

For a description of the Srcid and Srcrng parameters, and for a discussion and examples of the numeric input options, refer to the BUILDHGT keyword above.  The Dsbw(i) parameter contains the direction‑specific building widths, 36 for the Short Term model, and 16 for the Long Term model.  The directions proceed in a clockwise direction, beginning with the 10 degree flow vector for the Short Term model and beginning with the flow vector for the north sector for the Long Term model.

     The LOWBOUND keyword is used to exercise the non‑regulatory default option of calculating "lower bound" concentration or deposition values for downwash sources subject to enhanced lateral plume spread by super‑squat buildings (width is more than five times the height).  The syntax, type and order of this keyword is summarized below:

Syntax:

SO LOWBOUND  Srcid (or Srcrng) Idswak(i),i=1,36 (16 for LT)

Type:

Optional, Repeatable

Order:

Must follow the LOCATION card for each source input

where the Srcid and Srcrng parameters are described above for the BUILDHGT keyword, and the Idswak(i) parameter is an array of lower bound wake option switches beginning with the 10 degree flow vector and incrementing by 10 degrees clockwise for the Short Term model and beginning with the flow vector for the north sector for the Long Term model.  A value of 0 means to use the upper bound (regulatory default) for that sector, and a value of 1 means to use the lower bound for that sector.  The use of repeat values is permitted for inputting the Idswak array, e.g., a field of '36*1' indicates to use the lower bound for all 36 sectors.  Since this is a non‑regulatory default option, if the DFAULT option has been selected on the MODELOPT keyword (CO pathway), then any LOWBOUND inputs will be ignored, and the model will calculate the upper bound estimates.  The model will generate a non‑fatal warning message in such a case.

 

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