I had an interesting thought, the "flood plain maps" are probably a few (several) years old, depending on what the developer di with landscaping the current elevation may actually be a few feet higher and could make all the difference. The OP might be able to get a surveyor to determine the exact CURRENT elevation of the land and then compare that to what is reported in the flood plain maps, he may be able to make a case that the maps are out of date.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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