The cooling hose flange is usually not equipped with a plug. That would defeat the purpose of having a cooling hose. If the flange pulls out of the radiator, you will loose all the coolant and you should shut down the engine so it won't burn up.
If a strong typhoon comes and heavy flooding occurs several things could happen. People could die from drowning, homes could be ruined, and landslides could occur.
check cooling fan
An "unlevel" toilet flange might be a little difficult for a wax ring to seal, but could not in any way be responsible for a tank leak. If the tank is leaking between the tank and bowl, remove the tank, check the tank itself for a crack or defect, then check the flange gasket and tank bolts and gaskets. How do you know your flange is unlevel?
we could die. it will destroy homes, forestry our animals and our infastructure and water supplies.
The worst thing that could happen is that the police comes armed with guns
It could happen for a number of reasons - which of those reasons fits your case is impossible to tell without doing a proper diagnosis of the cooling system.
The cooling fan generally does not run when the car is cold, but could be wired directly to the battery so that when the ignition is engaged, the fan comes on. This is not a factory modification but is often accomplished if the car tends to run hot.
If you can get to the 6 inch cast iron, you could use a rubber coupler between the cast and the flange. If it is in the concrete, put a piece of 4 inch PVC inside the 6 inch and lead it in like you would a regular cast joint. Leave the 4 inch above the floor and slide the flange over it, screw it down and cut the 4 inch flush with the flange. They make just the flange that will slide over the pipe.
The cooling gets worse. The engine can heat up. A leakage may happen. You may solve this easily by using an appropriate spray to remove rust. Then wash the radiator with a powerful jet of water.
You can get a back miss alignment. Or to put it another way you could get bent out of shape. That is were a chiropractor comes in.
The cooling fan should kick on at about midway up the gage, check to see if it comes on. There is a cooling fan relay that might be bad, the motor itself could be the problem check at the connector for power, and check the fuse.
More oxygen means less CO2 so we could experience global cooling. Oxygen also feeds combustion so there could be bigger and more frequent forest fires.