Speaking as an engineer and as a freight item in that part of the plane behind the pilots, I would say that it takes a hell of a lot of water to soak a carpeted aisle to the extent that there appear to be ripples if not actual minor wavelets.
In an environment chock full of electronics I'd be alarmed at the introduction of water. Water plus gravity plus electricity usually equals disaster. I've seen it happen.
Then again I realise that the engineers working on this stuff generally get the message.