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Which quantity determines the effective height of a plume?

  • A.The height at which the ambient wind speed equals the exit velocity of the gases leaving the top of the stack
  • B.The stack height plus the plume rise
  • C.The stack height alone, since the exhaust gases mix with the ambient air immediately upon leaving the stack
  • D.The mixing height

Answer: B

Buoyant and momentum driven rise adds substantially to the physical stack height, often doubling it, and formulae by Briggs are used to estimate the addition. The rise depends on the exhaust temperature and velocity and on the ambient stability and wind. Neglecting it would badly overestimate ground level concentrations.

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