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Title: Section 3108  •  Size: 5585

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SECTION 3108 - COASTAL HIGH HAZARD ZONES-V ZONES

3108.1 General. Areas which have been determined to be subject to wave heights in excess of 3 feet (914 mm) or subject to high-velocity wave run-up or wave-induced erosion are designated as coastal high-hazard zones. Buildings or structures erected in coastal high-hazard zones shall be designed and constructed in accordance with this section.

3108.2 Elevation. Buildings or structures erected within a coastal high-hazard zone shall be elevated so that the lowest portion of horizontal structural members with the exception of footings, mat or raft foundations, piles, pile caps, columns, grade beams and bracing shall be located at or above the base flood elevation.

3108.3 Enclosures below Base Flood Elevation. Spaces below the base flood elevation in a coastal high-hazard zone shall be free of obstruction.

EXCEPTIONS: 1. Footings, mat or raft foundations, piles, pile caps, columns, grade beams and bracing that provide structural stability for the building.

2. Structural systems of entrances and required exits.

3. Storage of portable or mobile items that can be moved in the event of a storm.

4. Walls or partitions may be used to enclose all or part of the space, provided they are not part of the structural support of the building and are designed to break away under high tides or wave action without causing damage to the structural system of the building, see Section 3110.6. Screening, lattice-type arrangements or other materials which allow the passage of water may also be used.

3108.4 Foundations. Buildings or structures erected in coastal high-hazard zones shall be supported on piles or columns. When piles are used, they shall have soil penetration to resist the combined wave and wind loads to which they may be subject during a flood equal to the base flood elevation. Pile design shall include consideration of decreased resistance capacity caused by scour of the soil strata surrounding the piles. Pile system design and installation shall be made in accordance with the provisions of this code. When mat or raft foundations are used, they shall be located at a depth to provide protection from erosion or scour.

3108.5 Plan Requirements for Coastal High-hazard Construction. When buildings or structures are to be constructed in accordance with Section 3108, an architect or engineer licensed by the state to practice as such shall submit plans showing details of the foundation support and connection components to comply with the requirements of Section 3108.4. When solid walls or partitions are proposed below the base flood elevation, wall, framing and connection details of such walls in accordance with Section 3108.3 shall be provided.

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