Quote:
Originally Posted by BlackArcher101
I believe the stormwater tank and pumps are capable of handling a flood event. I don't see them allowing the tunnel to flood by design, especially with the future consideration of a LRT line going through it.
The electronic access system could be a security measure, preventing vehicles from accessing it if there is a back up (keep cars from stopping inside) or emergency event like a fire.
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Every road in the city is designed to flood if the rainfall is heavy enough. It is almost literally impossible to build anything that could handle every rainstorm. Infrastructure is designed so that it can handle things 99% of the time, but getting that number to 99.9% makes the project cost double.
So yes, the stormwater tank should handle almost every rainfall, but I wouldn't be surprised at all if every five years or so, the tunnel might have to be closed due to flooding. If the stormwater tank is full, and it's still raining faster than water can be pumped out of the tank, the tunnel is simply going to flood. Like you said, there are other reasons why the tunnel might need to be closed as well.