(A) All development (including substantial improvements) in non-coastal high hazard areas (all A Zones) for which provisions are not specified in this chapter or state specialty codes shall:
(1) Be located and constructed to have low damage potential;
(2) Be constructed with materials resistant to flood damage;
(3) If located in a regulatory floodway, meet the limitations of § 153.51;
(4) Be anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy, during conditions of the base flood;
(5) Have all enclosures below the base flood elevation designed to equalize hydrostatic flood forces on exterior walls by allowing for the automatic entry and exit of flood water. Designs for complying with this requirement must be certified by a licensed professional engineer or architect, or:
(a) Provide a minimum of two openings with a total net area of not less than one square inch for every square foot of enclosed area subject to flooding;
(b) The bottom of all openings shall be no higher than one foot above the higher of the exterior or interior grade or floor immediately below the opening; and
(c) Openings may be equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic flow of flood water in both directions without manual intervention;
(6) Have electrical and other service facilities located and installed so as to prevent water from entering or accumulating within the components during conditions of the base flood.
(B) Walled and roofed accessory structures, including substantial improvement to existing accessory structures, shall meet the requirements of division (A) above and shall:
(1) Be less than 200 square feet and not exceed one story;
(2) Have unfinished interiors and not be temperature controlled;
(3) Not be used for human habitation and may be used solely for parking of vehicles or storage of items having low damage potential when submerged; and
(4) Not be used to store toxic material, oil or gasoline, or any priority persistent pollutant identified by the Oregon Department of Environmental Quality, unless confined in a tank installed in compliance with this chapter or stored at least one foot above base flood elevation.
(Ord. 527, passed 1-14-2013)