In accordance with Section 312 of the Building Code, Utility and Miscellaneous Group U includes buildings and structures that are accessory in character and miscellaneous structures not classified in any specific occupancy in the Building Code, including, but not limited to, agricultural buildings, aircraft hangars (accessory to a one- or two-family residence), barns, carports, communication equipment structures (gross floor area less than 1,500 square feet), fences more than six feet high, grain silos (accessory to a residential occupancy), livestock shelters, private garages, retaining walls, sheds, stables, tanks, and towers.
Accessory structures in the SFHA shall comply with the elevation requirements of Article IV, § 135-4.3C or, if not elevated or dry floodproofed, shall:
A. 
Be wet floodproofed, via variance, for structures no more than 600 square feet. Accessory structures more than 600 square feet must be elevated or dry floodproofed;
B. 
Not be used for human habitation;
C. 
Be usable only for parking of vehicles and limited storage;
D. 
Be constructed with flood-damage-resistant materials below the base flood elevation;
E. 
Be constructed and placed to offer the minimum resistance to the flow of floodwaters;
F. 
Be anchored to prevent flotation;
G. 
Have electrical service and mechanical equipment elevated to or above the base flood elevation;
H. 
Be provided with flood openings which shall meet the following criteria:
(1) 
There shall be a minimum of two flood openings on different sides of each enclosed area; if a building has more than one enclosure below the lowest floor, each such enclosure shall have flood openings on exterior walls.
(2) 
The total net area of all flood openings shall be at least one square inch for each square foot of enclosed area (nonengineered flood openings), or the flood openings shall be engineered flood openings that are designed and certified by a licensed professional engineer to automatically allow entry and exit of floodwaters; the certification requirement may be satisfied by an individual certification or an evaluation report issued by the ICC Evaluation Service, Inc.
(3) 
The bottom of each flood opening shall be one foot or less above the higher of the interior floor or grade, or the exterior grade, immediately below the opening.
(4) 
Any louvers, screens or other covers for the flood openings shall allow the automatic flow of floodwaters into and out of the enclosed area.
Utility and Miscellaneous Group U buildings and structures, including substantial improvement of such buildings and structures, shall be anchored to prevent flotation, collapse, or lateral movement resulting from flood loads, including the effects of buoyancy, during conditions of the base flood.
Utility and Miscellaneous Group U buildings and structures, including substantial improvement of such buildings and structures, shall be elevated such that the lowest floor, including basement, is elevated to or above the base flood elevation in accordance with ASCE 24.
Fully enclosed areas below the design flood elevation shall be constructed in accordance with ASCE 24.
Flood-damage-resistant materials shall be used below the design flood elevation.
A. 
Mechanical, plumbing and electrical systems, including plumbing fixtures, shall be elevated to or above the base flood elevation.
B. 
Exceptions. Electrical systems, equipment and components, and heating, ventilating, air-conditioning, and plumbing appliances, plumbing fixtures, duct systems, and other service equipment shall be permitted to be located below the base flood elevation, provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding to the base flood elevation in compliance with the flood-resistant construction requirements of this Code. Electrical wiring systems shall be permitted to be located below the base flood elevation, provided they conform to the provisions of NFPA 70 (National Electrical Code).