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-5- . If detailed maps of the "lOa year" floodplain are not available, states and communities sometimes manage and regulate those areas which have been flooded by past flood or which the community has reason to expect to be flood-prone, based on best available data such as soil maps. (See Chapters 1,2, 6, and 8.) A "regu 1 a tory wetland" is defi ned by the U. S. Army Corps of Engineers for the Federal 404 permit program to include: The term wetlands means those areas that are included or saturated by surface or ground water at a frequency or duration sufficient to support, and that under normal circumstances do support a prevalence of vegetation typically adapted for life in saturated conditions. Wetlands generally include swamps, marshes, bogs and similar areas. Definitions contained in state and local regulations are similar. However, unvegetated areas are addressed by some defini- tions. (See Chapters 1, 2, 6 and 9.) . 8. Q. What are the basic regulatory techniques available to communities managing and regulating their floodplains and wetlands? A. Local and state programs utilize five types of legal measures. Floodplain Zoning specifies the location, usage, and density of uses including fills and structures. Development may be pro- hibited or carefully controlled in wetland and floodplain areas. Building Codes regulate the design, elevation, and construction materials of new structures. Generally, structures must be elevated or floodproofed to the lOa-year flood protection elevation. Subdivision Regulations control the process of subdividing a large parcel of land into smaller house lots. As a condition to subdivision approval, the community may require a developer to refrain from building in hazardous areas and to install drainage facil ities. Sanitary and Well Codes establish minimum standards for on-site waste disposal and water supply. They may prohibit such facilities in areas of high ground water and flood hazards. .