Check the door seal under the door, it may be bad.
You have a leak somewhere.
See the link below for a report on the Boscastle Flood of 2004.
cross connection
Wet passenger flood is caused by either a leak in the air conditioning drain line or a leak in the windshield sealant or a coolant leak coming from the heater core.
Knowing how a car functions is important. The "No gas" symbol on the passenger flood panel is the Fuel shut off switch.
2004 in Boscastle. Link below provides more information.
7 feet
Check the undercarriage for rust holes. My Bonneville would flood when it rained because of a small hole in the passenger side rear wheel well.
Cyclical
in case your foundation collapses. happened to us and believe me we aren't waterfront.
Yes, some sections of the line have flood defence barriers, most notably near Embankment. The tunnel doors are in the railway tunnel and in passenger walkways.
Just before midnight, the river crested at six inches below flood stage.