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                          TABLE 1‑5

  COEFFICIENTS USED TO CALCULATE LATERAL VIRTUAL DISTANCES

VIRTUAL DISTANCES

            FOR PASQUILL‑GIFFORD DISPERSION RATES

Pasquill

Stability

Category

 

 

p

 

 

q

A

209.14

0.890

B

154.46

0.902

C

103.26

0.917

D

68.26

0.919

E

51.06

0.921

F

33.92

0.919

 

         Wind direction ─────────────>

 

┌──────────────────────────────────────────┐   ──

│                                          │      1/2 Lb

│            ┌──┐  ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ │   ──

│         ┌──┘  └──┐                       │

│         │Building│                       │

│         │        │                       │

│         └─────┐  │                       │

│               │  │                       │

│               └──┘ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ │   ──

│                                          │      1/2 Lb

└──────────────────────────────────────────┘   ──

 

│<──2Lb──>│         │<─────────5Lb─────────>│

 

Lb is the lesser of the height and projected width of the building for the particular direction sector.  For additional guidance on determining whether a more complex building configuration is likely to cause wake effects, the reader is referred to the Guideline for Determination of Good Engineering Practice Stack Height (Technical Support Document for the Stack Height Regulations) ‑ Revised (EPA, 1985).  In the following sections, the Huber and Snyder building downwash method is described followed by a description of the Schulman and Scire building downwash method.

    

 

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