2.1.5.2 Lateral and Vertical Virtual Distances.

See Section 1.1.5.2 for a discussion of the procedures used to calculate vertical virtual distances.  The lateral virtual distance is given by:

where ro is the effective source radius in meters.  For volume sources (see Section 2.2.2), the program sets ro equal to 2.15σyo, where σyo is the initial lateral dimension.  For area sources (see Section 2.2.3), the program sets ro equal to xo/ where xo is the length of the side of the area source.  For plumes affected by building wakes (see Section 1.1.5.2), the program sets ro equal to 2.15 σy´ where σy´ is given for squat buildings by Equation (1‑41), (1‑42), or (1‑43) for downwind distances between 3 and 10 building heights and for tall buildings by Equation (1‑44) for downwind distances between 3 and 10 building widths.  At downwind distances greater than 10 building heights for Equation (1‑41), (1‑42), or (1‑43), σy´ is held constant at the value of σy´ calculated at a downwind distance of 10 building heights.  Similarly, at downwind distances greater than 10 building widths for Equation (1‑44), σy´ is held constant at the value of σy´ calculated at a downwind distance of 10 building widths.

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