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a (4) Isolated topographic depressions with a history of flooding or a high potential 'for flooding. (c) A Costal High Hazard Zone shall encompass areas subject to high velocity waters caused by, but not limited to, hurricane wave wash. (d) A Floodway shall include the normal channel of a watercourse and adjacent lands that must remain unobstructed to convey the regulatory flood discharge without causing flood elevations to rise along any stretch of the watercourse above a specified permissible increase known as the floodway surcharge. The floodway surcharge shall be established, considering both existing and potential development, at a level that avoids an increase in potential flood damage. The floodway surcharge may be increased; however, if a developer wishes to construct some additional obstruction, he must first obtain flowage easements from the owners of all land that would be affected by increased levels. In no case, however, may a floodway surcharge exceed one foot. The floodway shall normally be calculated assuming equal encroachment on the floodplain from both sides of the watercourse, unless legally enforceable deed restrictions, limiting development rights, are recorded for the lands needed for the floodway. (e) Flood Hazard Zones, Critical Flood Zones, Coastal High Hazard Zones and flood elevation data may be identified through flood hazard studies and delineated on the Official Flood Hazard Map. A copy of the Official Flood Hazard Map and support- ing data is attached and incorporated by reference into this ordinance (Appendix B). As new or better information becomes available, this ordinance will be amended to incorporate new maps and flood elevations and other data. Current maps and supporting information may be inspected at: Indian River County Administration Building Community Development Division 1840 25th Street Vero Beach, Florida 32960 (f) Sufficient funds have not been available to map the entire land area of Indian River County and perform the engineering studies necessary to identify Flood Hazard Zones, Critical Flood Zones, Coastal High Hazard Zones and Flood Protec- tion Elevations. 14 5 Ui Ugl The Community Development Director shall obtain, review and reason-