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How does this change in data impact homes built in AE flood zones at required elevations, but based on the 1929 data...which now would appear to be flawed? — Preceding unsigned comment added by 69.180.95.202 ( talk) 02:27, 23 April 2008 (UTC) reply

The North American Vertical Datum of 1988 is a vertical control datum for surveying and not a measure of elevation relative to local mean sea level. Flood zone designations should be unaffected by the choice of vertical datum. -- Buaidh ( talk) 13:38, 23 April 2008 (UTC) reply