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     For hw/hb greater than 5, and a stack located laterally within about 2.5 hb of the end of the building, lateral plume spread is affected by the flow around the end of the building.  With end effects, the enhancement in the initial lateral spread is assumed not to exceed that given by Equation (1‑42) with hw replaced by 5 hb.  The modified σy equation is given by:

     The upper and lower bounds of the concentrations that can be expected to occur near a building are determined respectively using Equations (1‑43) and (1‑44).  The user must specify whether Equation (1‑43) or Equation (1‑44) is to be used in the model calculations.  In the absence of user instructions, the ISC models use Equation (1‑43) if the building width to building height ratio hw/hb exceeds 5.

     Although Equation (1‑43) provides the highest concentration estimates for squat buildings with building width to building height ratios (hw/hb) greater than 5, the equation is applicable only to a stack located near the center of the building when the wind direction is perpendicular to the long side of the building (i.e., when the air flow over the portion of the building containing the source is two dimensional).  Thus, Equation (1‑44) generally is more appropriate then Equation (1‑43).  It is believed that Equations (1‑43) and (1‑44) provide reasonable limits on the extent of the lateral enhancement of dispersion and that these equations are adequate

 

 

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  APLICACIONES castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

 

français:  DIS CUS DES RAD