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Title: Section 3107  •  Size: 6382

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SECTION 3107 - FLOOD HAZARD ZONES-A ZONES

3107.1 General. Areas which have been determined as prone to flooding but not subject to wave heights of more than 3 feet (914 mm) are designated as flood hazard zones. Buildings or structures erected in flood hazard zones shall be designed and constructed in accordance with this section.

3107.2 Elevation. Buildings or structures erected within a flood hazard zone shall have the lowest floor, including basement floors, located at or above the base flood elevation.

EXCEPTIONS: 1. Except for Group R Occupancies, any occupancy may have floors below the base flood elevation in accordance with Section 3107.4.

2. Floors of buildings or structures which are used only for building access, exits, foyers, storage and parking garages may be below the base flood elevation in accordance with Section 3107.3.

3107.3 Enclosures below Base Flood Elevation. Enclosed spaces below the base flood elevation shall not be used with the exception of building access, exits, foyers, storage and parking garages. Enclosed spaces shall be provided with vents, valves or other openings which will automatically equalize the lateral pressure of waters acting on the exterior wall surfaces. The bottom of the openings shall not be higher than 12 inches (305 mm) above finish grade. A minimum of two openings per building, or one opening for each enclosure below the base flood elevation, whichever is greater, shall be provided. The total net area of such openings shall not be less than 4 square feet or 1 square inch for every square foot (0.37 or 0.007 for every 1 ) of enclosed area, whichever is greater.

3107.4 Flood-resistant Construction. Buildings or structures of any occupancy other than Group R may, in lieu of meeting the elevation provisions of Section 3107.2, be erected with floors usable for human occupancy below the base flood elevation, provided the following conditions are met:

1. Space below the base flood elevation shall be constructed with exterior walls and floors that are impermeable to the passage of water.

2. Structural components subject to hydrostatic and hydrodynamic loads during the occurrence of flooding to the base flood elevation shall be capable of resisting such forces, including the effect of buoyancy.

3. Openings below the base flood elevation shall be provided with watertight closures and shall have adequate structural capacity to support flood loads acting upon closure surfaces.

4. Floor and wall penetrations for plumbing, mechanical and electrical systems shall be made watertight to prevent flood water seepage through spaces between penetration and wall construction materials. Sanitary sewer and storm drainage systems that have openings below the base flood elevation shall be provided with closure devices to prevent backwater flow during conditions of flooding.

3107.5 Plan Requirements for Flood-resistant Construction. When buildings or structures are to be constructed in accordance with Section 3107.4, an architect or engineer licensed by the state to practice as such shall prepare plans showing details of the floor wall and foundation support components. Calculations and approved technical data used to comply with the conditions of Section 3107.4 shall also be provided.

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