became involved with this flood plain surveys
as a result of federally insured mortgages requiring Federal Emergency Management Agency
(FEMA) flood information to be added to our residential and commercial survey plats. We soon became very aware that the flood plain maps were "approximate" at best, and that the use of the maps was intended to show Special Flood Hazard
areas in general and were never meant to pinpoint locations as they are being used today.
We have found that almost all FEMA maps are lacking any vertical information and probably half don't have base flood elevations. In the early 1990's FEMA started a mapping program to test methods of getting vertical information on properties in or near Special Flood Hazard areas. Our firm became one of the sub-contractors to develop procedures to perform low cost elevation certificates.