Discussion
Good engineering practice height for four building geometries.
| Building height (m) | Projected width (m) | Lesser dimension (m) | GEP height (m) |
|---|---|---|---|
| 30 | 20 | 20 | 60 |
| 24 | 60 | 24 | 60 |
| 40 | 40 | 40 | 100 |
| 15 | 50 | 15 | 37.5 |
Why does the rule use the lesser of height and width?
Answer: D
Correct answer: The wake scales with the smaller dimension
The recirculating cavity behind a building is set by the smaller of its dimensions - a tall narrow building and a low wide one generate similar wakes. Using the lesser dimension therefore matches the rule to the physics; using the greater would give a needlessly tall stack for a broad low building.
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