(a)

1. (1) Nonresidential structures may be permitted if dry flood proofed or wet flood proofed subject to Design Review Section approval.

2. (2) Types of structures that will be considered include but are not limited to:

   1. (A) Picnic pavilions;
   2. (B) Park restroom facilities;
   3. (C) Parking garages;
   4. (D) Boat storage; and
   5. (E) Marine dock facilities (including dock-mounted stores).

(b)

1. (1) For dry flood proofing, the structure and attendant utility and sanitary facilities shall be designed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy.
2. (2) The elevation of the dry flood proofing must be equal to the elevations noted in 22 CAR § 111-708, certified by the design professional, and documentation submitted to the Design Review Section for review and approval.

(c)

1. (1) For wet flood proofing of new construction and substantial improvements, fully enclosed areas below the base flood elevation which are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters.

2. (2) Designs for meeting this requirement must be certified by a registered engineer or architect and meet or exceed the following minimum criteria:

   1. (A)

(i) A minimum of two (2) openings having a total net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding shall be provided.

1. (ii) The bottom of all openings shall be no higher than one foot (1’) above grade.

   1. (iii) Openings may be equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic entry and exit of floodways;

   2. (B)

      1. (i) Automatic vents and screens must be periodically inspected and tested to ensure proper operation during a flood event.
      2. (ii) The agency shall maintain a record of each test procedure and result along with maintenance records on the automatic type vents; and

   3. (C)

      1. (i) Structure shall be constructed with materials resistant to flood damage and allow for quick sanitary cleanup and return to service.
      2. (ii) Materials that support the growth of mold shall be prohibited.
      3. (d)
2. (1) Structures shall be adequately anchored to prevent flotation, collapse, or lateral movement of the structure or equipment resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy and velocity of the water.
3. (2) The potential for debris impact must also be considered as well as the probability for the structure or contents becoming debris for downstream property.
4. (3) Designs for meeting this requirement must be certified by a registered engineer or architect.

(e)

1. (1) Facilities shall be constructed with electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities that are designed or located to prevent water from entering or accumulating within the components during conditions of flooding.
2. (2) Designs for meeting this requirement must be certified by a registered engineer.