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` t structure is floodproofed or has adequate floodproofing provisions designed within said structure. LEVEL OF ONE-HUNDRED-YEAR FLOOD: The highest level of flooding that on the average is likely to occur once every one hundred (100) years (or has a one (1) per cent chance Of occurring each year). SUBSTANTIAL IMPROVEMENT: Any repair, reconstruction, or improvement of a structure, the cost of which equals or exceeds fifty (50) per cent of the actual cash value of the structure either before the improvement is started, or if the structure has been damaged and is being restored, before the damage occurred. Substantial improvement is commenced when the first alteration of any structural part of the building is begun. 4 Section 3. ADOPTION OF FLOOD HAZARD BOUNDARY AND STUDY MAPS. The flood hazard boundary maps, including the zone designations on said maps and all explanatory material noted thereon, and the flood insurance study, dated January 1978, prepared by the U.S. Department of Housing and Urban Development, Federal Insurance Administration, are hereby incorporated into this Article by reference in their entirety. Said maps and study shall be kept in the custody of that individual delegated the administrative responsibility by the admin- istrative director of Indian River County for the approval and issuance of building permits. Said maps shall be referred to for a determination of the flood-prone and specificed hazard areas and the one-hundred-year base flood elevation line for a calculation of the construction requirements for any structure within the unincorporated areas of Indian River County under the provisions of this Article. Section 4. REQUIRE14ENTS FOR RESIDENTIAL CONSTRUCTION. Within those unincorporated areas of Indian River County designated as special flood hazard areas by the flood maps, all new construction of residential structures or substantial improvements of existing residential structures including prefabricated and.mobile homes shall have the lowest floor of such structure, including basements, elevated to or above the applicable level of the one-hundred-year flood. Section 5. REQUIREMENTS FOR NONRESIDENTIAL CONSTRUCTION. Within those unincorporated areas of Indian River County designated as special flood hazard areas by the 'flood maps, all new construction of nonresidential structures or sub- stantial improvements of exisiting nonresidential structures shall have the lowest floor including basements, elevated to or above the applicable level of the one-hundred-year flood; or, together with attendant utility and sanitary facilities, such nonresidential structures shall be floodproofed up to the applicable level of the one-hundred-year flood. Section 6. COASTAL HIGH HAZARD AREAS; NONCONFORMING USES. Within those areas designated as coastal high hazard areas by the flood maps, all nonconforming uses on land below the one-hundred-year flood level shall not be expanded. Section 7. DEVELOPMENT OF COASTAL HIGH HAZARD AREAS. Within those areas designated as coastal high hazard areas by the flood maps, no land below the level of the one- hundred-year flood shall be developed unless the new con- struction or substantial improvement shall:.