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Major costs in the procedures described above are involved in mobilization and demobiliza- tion of this equipment. Some reductions in the cost per residence can be realized if work on more than one structure can be undertaken within a reasonably limited area and within a limited time. The sample cost estimates assign these mobilization costs to one struc- ture. These cost estimates were derived from various sources, primarily the Coastal Construction Manual, and Means Site Work Cost Data 1988.' The cost estimates reflect 1988 price levels in the Houston-Galveston area of the Texas gulf co~st. The estimates are intended only to indicate the general range of costs involved in a slab raising project for compari- son with other possible flood protection measures or with new construction, and should not be used as a basis for estimates for specific projects. Costs in addition to those shown would be incurred for landscaping, and for temporary housing during the construction if the work prevented remaining in residence during the process. CONCLUSIONS Raising and moving a slab-on-grade structure with the slab attached is both practi- cal and cost effective when undertaken by competent, experienced, and adequately equipped structural movers. In some cases the procedure may provide the only practical flood proofing option. Each structure will have highly individual engineering and archi- tectural characteristics effecting economic feasibility and aesthetic desirability. Some advantages of this procedure include: It may permit continued occupancy and use of the structure during the process; It avoids or simplifies interior shoring and brac- ing, and better preserves the structural integ- rity of the building; The technique is appli- cable to some construction materials not otherwise feasible to move or raise, such as concrete block. This procedure deserves serious con- sideration as a practical non structural flood protection measure. I. United States Water Resources Council, Floodplain Management Handbook, September, 1981, p. 20. 2. Relocation of a Large, Slab-On-Grade House from a Flood Plain to a Flood Free Site, U. S. Army Corps of Engineers, Tulsa District, 1984. 3. Coastal Construction Manual, Federal Emergency Management Agency, FEMA-55/ February 1986. 4. Coastal Construction Manual, p. F-1 5. Coastal Construction Manual, pp. F2 - F4 6. Coastal Construction Manual, p. F-6 7. Coastal Construction Manual, p. F-7 8. Means Site Work Cost Data 1988, R. S. Means Company, Inc., Kingston, MA, 1987. 8