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Effects of negative and positive pressure in tunnel sewer drop shaft

Effects of negative and positive pressure in tunnel sewer drop shaft

Effects of negative and positive pressure in tunnel sewer drop shaft

(OP)
I am looking at a very large diameter tunnel connected via a vortex drop circa 700mm diameter. There are connected venting lines that also channel water in times of extreme events.
How will pressure fluctuations effect the system performance (+/-)?  
 

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