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Manufactured Home - This definition replaces the former definition of "mobile home" to include those structures that are constructed and designed for use with or without a permanent foundation. This definition clarifies the confusion that review agencies have had in the past in trying to differentiate between the two types of structures. Substantial Improvements - This is a new definition that sets forth criteria for determining if new construction or alteration to an existing structure must comply with the FEMA requirements. Basically, any improvement in which the cost equals or exceeds fifty percent of the market value of the structure is considered "substantial improve- ment." II. Unnumbered A Zones The most difficult portions of the local flood program to administer effectively are those areas within the unnumbered A zones. In converting to the Regular phase of the National Flood Insurance Program (NFIP) through the conversion process, the Flood Insurance Rate Map for a community will show 100 -year flood areas without assigned 100 -year (base) flood elevations. The community is required under Section 60.3(b)4 of the NFIP regulations to obtain, review and reasonably utilize any base flood elevation data available from a Federal, State, or any other source for requiring that (i) all new construction and substantial improvements of residential structures have the lowest floor (including basement) elevated to or above the base flood level and (ii) all new construction and substantial improvements of non-residential structures have the lowest floor (including basement) elevated or flood -proofed to or above the base flood level. The following is a listing of sources from which base flood elevation information frequently may be obtained: 1. Corps of Engineers District Office 2. Soil Conservation Service State Office 3. U.S. Geological Survey Office 4. State Water Resource Agency 5. Private Engineering firms Unfortunately, there is little useable information available from these sources for Indian River County; thus, staff has placed the burden on the owner tb provide the information through a registered professional engineer. In ,lieu of this cumbersome and expensive process, the revised ordinance provides that structures in unnumbered A zones shall be elevated no lower than eighteen inches above the crown of the road or to an elevation required by the Indian River County Health Depart- ment, whichever is higher. III. Construction Requirements for Non -Residential Facilities and Other Structures With Enclosed Areas Below the Base Flood Elevation The revised ordinance contains the new FEMA regu- lations for the design of structures with fully enclosed areas below the lowest floor that are subject to flooding. All such structures must be capable of automatically equalizing hydrostatic flood forces. Designs for meeting this requirement must be certified by a registered pro- fessional engineer or architect. 74 ��9 ii JAN 2 q 193 BOOK rrg