Discussion
The physical stack height plus the plume rise gives the _____ stack height.
Answer: B
Correct answer: effective
The physical stack height plus the plume rise gives the effective stack height, written \( H = h_s + \Delta h \). This is the height at which the plume levels off and begins to travel horizontally, and it is the height that enters the Gaussian plume equation.
The distinction from the geometric or physical height is important in practice: a hot, fast exhaust may rise a hundred metres or more above the stack top, and because the maximum ground level concentration varies roughly as \( 1/H^2 \), that rise can matter as much as the stack itself. "Critical" and "nominal" are not terms used here.
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