Advice for driving through floodwater Television news reports about flooding have shown many drivers taking their cars through quite deep water. Do manufacturers conduct tests in deep water? I have a Mitsubishi L200, so if the situation arose how deep would it be safe to go? L200s have quite high air intakes, so as long as there are no breaches in the pipework, it should be OK. If engines ingest floodwater, it's curtains for the conrods.