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F. Subdivisions NFl P regulations require that developers supply base flood elevation data for their projects which exceed 50 lots or 5 acres, The intent of this requirement is to obtain base flood elevation data which can be used by the community for determining elevation and flood proofing needs of new construction, Thus, any elevation data used to satisfy this requirement will in turn be the basis of elevation and flood proofing stan, dards for structural development which takes place in the subdivision, Accordingly, the elevation data provided by the applicant for subdivi- sion plat approval should be consistent with the scope and scale of the proposal. For instance, if an applicant proposed to subdivide 20 acres of rural land into four equal parcelS and no immediate construction is planned, then only the most elementary elevation data would be necessary, However, if a developer'S proposal was for 20 acres of land to be divided into 80 lots, then the developer should obtain data which approximate the accuracy of the Flood Insurance Study, In determining how detailed an applicant's base flood elevation data should be, the local administrator should obtain the following informa- tion from the applicant: -The size and complexity of the proposed subdivision, -The percentage of the subdivision area which would be fiood-prone, -The use to which the flood-prone area would be put (Le" structural development, open space, parking), -The proposed location of building envelopes and of streets which might need to be used for emergency vehicles, G. Manufactured Homes (formerly Mobile Homes) In reviewing a permit for the placement of a manufactured home in a manufactured home park located in a flood hazard area, the local flood- plain administrator must determine if the manufactured home is an addi- tion to an existing park or if it replaces a home that nas moved out. If the manufactured home is a replacement, it does not have to meet the standards as far as elevation of the lowest floor is concerned as long as it is not larger than the home it replaces, It does, however, have to meet the tie-down requirements, If the manufactured home is an addition to the park (in other words, the park is being expanded to include more homes), then it must be placed in such a manner that the lowest floor is elevated to or above the BFE on a permanent foundation and it must be tied down, In reviewing permits for completely new manufactured home parks or additions, or permits for manufactured homes placed in a flood hazard area but not in a manufactured home park or subdivision, the local floodplain administrator must require that the lots or pads on which manufactured homes will be placed are elevated so that the lowest floor will be to or above the BFE on a permanent foundation, Adequate drainage must also be provided, These homes must also meet the anchoring (tie-down) requirements, If the manufactured home is per' manently anchored to a foundation, (bolted to a poured concrete or block foundation), then it meets anchoring requirements, Manufactured homes placed on blocks, however, do not have adequate protection from flooding and must be tied down, 13