Why are the floodplains on the new FEMA maps (effective June 18, 2007) often much larger in size than those shown on existing maps? Might these revised floodplains change again?
FEMA reports that this expansion of the floodplain is not necessarily an increase in its physical size; rather, the change is due to advanced technology which provides greater accuracy in delineating the actual floodplains than existed twenty years ago. But because rapid urban development has occurred in the Cypress Creek Watershed since the LiDAR topography data was obtained (late 2001), and because this development will likely continue, the floodplains are expected to change. HCFCD and CCFCC are working together on engineering analysis to determine the extent to which this will occur under a variety of land-use conditions, drainage regulatory requirements, etc.
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