Diving back into the water logged tunnel for a moment...
No one expects a site to plan and build for rain like we had on Friday to occur all the time. One would not expect them to have a bilge and pumps/drainage to handle that volume all the time BUT they
might have installed pumps that could clear a flood like that in, say 15 minutes.
Obviously there is a ratio between the biggest pumps to handle that flow every day and pumps that handle 25 or 33% of that flow every rainy day. If you then have a very bad storm, the pumps should be able to clear it in a specified time. It appears that such a provision is not in place.