Discussion
Which statement about building downwash is TRUE?
Answer: C
Correct answer: A plume in the wake cavity reaches the ground
A building disturbs the flow around it and creates a recirculating cavity in its lee. A plume drawn into that cavity is mixed to the ground immediately, so the whole benefit of the stack is lost. The remedies work the other way from the option offered: *raising* the exit velocity and building the stack to about two and a half times the height of the nearby structure keep the plume clear of the wake.
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