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(B) In.the event that a monolithic foundation is used, the maximum elevation of the top of the slab is to be below the design scour depth (See Chapter 5.28, Shore Protection Manual, U.S. Army Corps of Engineers, 4th Edition, 1984) unless positive methods are provided to prevent scour. (C) Other types of spread footings such as running footers or pads may be permitted when positive methods are provided to prevent scour. No substantial walls or partitions shall be constructed below the level of the first finished floor. This does not preclude the construction of: 1. Stairways, 2. Shearwalls essentially perpendicular to breaking waves, 3. Shearwalls essentially parallel to breaking waves which do not exceed a maximum of 20% of the building length; 4. Wind or sand screens constructed of fabric or wire mesh, 5. Light open lattice partitions with individual wooden lattice strips no greater than 3/4" thick or 3" wide; 6. Elevator shafts, 7. Breakaway or frangible building walls, or 8. Substantial building walls constructed above the wave action and storm surge expected under design storm conditions. (c) Building and Floor Elevations The minimum elevation for the underside of the building support .structure (excluding foundation) shall be above the elevation of the design breaking wave crests or wave uprush superimposed on the storm surge with dynamic wave set up expected under design storm conditions. The elevation of the storm surge with dynamic wave set up shall be the elevation established by the Indian River County Stormwater Management and Flood Protection Ordinance. (d) Erosion and Design Grade The elevation of the soil surface to be used in the design of foundations, calculation of pile reactions, and bearing capacities shall not be greater than that which would result from the erosion reasonably anticipated. as a result of design storm conditions. Calculation of the design grade shall take into account localized scour due to the presence of structural components. Erosion computations for foundation design shall consider all vertical and lateral erosion and scour -producing forces. (e) Wave Force Desi 1. Calculations for wave forces resulting' -from design storm conditions are building foundations 'and superstructures may be based upon the minimum criteria and methods prescribed in the Naval Facilities Engineering Command •Design Manual, NAVFAC DM -26, U.S. Department of Navy, Shore: Protection Manual, U.S. Department of the Army Corps of Engineers; U.S. Department of the Army Coastal Engineering Research Center Technical Papers and Reports; the Technical and Design Memoranda of the Division of Beaches and Shores, Florida Department of Natural Resources; or other professionally recognized methodologies which produce equivalent design criteria.