Building codes use the LiMWA to identify the "Coastal A Zone" (e.g., the area where base flood wave heights are between 1.5 and 3 feet), where certain design and construction requirements are instituted. Because of the presence of damaging waves, VE Zone design, construction, and certification practices are recommended, though not required by the National Flood Insurance Program, in the LiMWA. Recommendations include:
- Use open foundations (pile or pier) designed to resist all base flood conditions (waves, high velocity flow, erosion and scour, floodborne debris);
- Since waves and debris will be impacting the floor joists and other foundation elements during the base flood, elevate the bottom of the lowest horizontal structural member supporting the lowest floor above the base flood wave crest elevation;
- Use flood-resistant materials above the level of the walking surface of the lowest floor in the event that future flooding exceeds the lowest floor level;
- Assure that connections between the foundation and the elevated building are capable of withstanding simultaneous wind and flood forces;
- Use the space below the lowest horizontal structural member for parking, access, or storage only. Adding sufficient freeboard to allow parking beneath the building will not only reduce future flood damages, but will also lower flood insurance premiums; and
- Use screens or latticework if space below the elevated floor must be enclosed.