Discussion
Effective stack height and the resulting maximum ground level concentration.
| Physical height (m) | Plume rise (m) | Effective height (m) | Relative maximum |
|---|---|---|---|
| 80 | 0 | 80 | 1.00 |
| 80 | 30 | 110 | 0.53 |
| 80 | 55 | 135 | 0.35 |
| 120 | 55 | 175 | 0.21 |
What do the middle two rows show about plume rise?
Answer: B
Correct answer: 55 m of rise cuts the maximum by two thirds
Compare the first and third rows, both at 80 m physical height: the relative maximum falls from 1.00 to 0.35 - almost exactly the \((80/135)^2 = 0.35\) the inverse-square rule predicts. Fifty-five metres of plume rise is worth as much as fifty-five metres of stack.
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