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I am afraid that because the flooding was a "superseding intervening cause" of your damage, the property owner would not be liable for damage occurring on their property. The fact is that a property owner is liable for only known dangerous objects on their property that cause harm. The property owner here would argue that had there been no flooding, over which they had no control, the object you struck would have been readily visible and you would have had notice it was there.
The fact that the store remained open in dangerous conditions does not make them liable I am afraid, you have to prove that they knew of the danger that was present in the lot and it was concealed (not by some intervening act of God) and they failed to provide adequate notice or warning of the hidden danger. This is the premise of premises liability law, the owner's duty to protect from known hazards. Of course, in negligence law, a superseding intervening cause of harm can negate the property owner's liability and that is what has happened here, the flood waters intervened to make something that was ordinarily visible invisible and that is not the fault of the owner of the property.
In addition, in a court suit, the store will argue that because of the hazardous conditions of flood waters as a driver you should have been using extra caution, which would include not driving
in such hazardous conditions where you could not see the road or the ground because of the flood water and they will turn the liability around on you for not exercising proper caution.
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