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mined unless relocation is feasible Older buildings often have structural limitations and seldom prove to be feasi- ble candidates for elevation above the base flood level Additional constraints arise if the project involves a histor- ical building that cannot be altered to the extent of reduc- ing its historical integrity. All such issues affecting existing buildings must be analyzed in relation to strategies for flood damage reduction IJ;pe of Use. ResidentiaL commercial, industriaL and public building projects have different factors influencing the choice of techniques for flood damage reduction First, in meeting National Flood Insurance Program (NFIP) regulations, residential structures are required to be above the base flood elevations, while other uses have the option of being either elevated or floodproofed to the same level Second, the type of use also influences site de- cisions. For example, the use of clustering techniques will be different for residential buildings than for commercial or industrial uses. Third, the type of use can affect the site layout in terms of required access to buildings during flooding, and will influence the methods for controlling water runoff Finally, different uses influence floodproofing tech- niques. Waterproofing is generally more relevant for com- mercial buildings that have easily damaged materials and finishes, valuable records, and vulnerable contents. Wet floodproofing might be more appropriate for an indus- trial building that is easier to clean and has more easily protected contents- Applicability of Desiaft 'Ieduti'lues As previous chapters have made clear, buildings ideally will be located so that they are not subject to flooding. Yet there are still a variety of situations where this ideal is im- practical or unnecessary and that call for special measures to reduce flood damage For example, when: . The project site is not itself in a flood hazard area, but is where development might increase flood levels elsewhere . Buildings are located in a fringe area that is subject to only mild flooding . Buildings can be cost-effectively floodproofed to achieve an acceptable level of safety. . The project includes existing buildings that, due to historical or economic significance or an existing urban infrastructure, must remain in a flood-prone area . Existing buildings are to be removed from a flood hazard area, but the period of amortization will re- quire temporary protection 4 Pi u.s. Army Corps of Engmeers 55