The Petaluma River Basin Flood Plain and Floodway Areas are defined as those areas of Special Flood Hazard identified by the Federal Insurance Administration through a scientific and engineering report entitled “Flood Insurance Study for the City of Petaluma”, dated August 1979, with accompanying Flood Boundary and Floodway Map; and accompanying Flood Insurance Rate Maps. Any official revisions or updates thereto are hereby adopted by reference and declared to be a part of this Ordinance. This Flood Insurance Study is the minimum area of applicability of this Ordinance and may be supplemented by studies for other areas which allow implementation of this Ordinance and which are recommended to the City Council by the Floodplain Administrator. Maps and data which reflect this delineation shall be kept on file in the office of the Director of the City of Petaluma and shall be available for public examination at reasonable times.