The max being 20", you must of meant 1'?

The problem with driving through a foot of standing water in Texas is you are likely to get half way through when a pick-em-up truck goes by at 50mph pushing a 6' tidal wave and throwing off 5000 gallons of tire spray.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas