Relief from the elevation or dry flood-proofing standards may be granted for new and replacement accessory structures containing no more than 200 square feet. Such a structure must meet the following standards:
(A) It shall not be subject to Specialty Codes;
(B) The accessory structure shall be located on a property, or an adjacent property with same owner, as a dwelling;
(C) It shall 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;
(D) Toxic material, oil or gasoline, or any priority persistent pollutant identified by the Oregon Department of Environmental Quality shall not be stored below BFE, or where no BFE is available lower than three feet above grade, unless confined in a tank installed in compliance with this chapter;
(E) It shall be constructed of flood resistant materials;
(F) It shall be constructed and placed on the lot to offer the minimum resistance to the flow of floodwaters;
(G) It shall be firmly anchored to prevent flotation;
(H) Services such as electrical and heating equipment shall be elevated or flood-proofed to or above the base flood elevation; and
(I) It shall be designed to equalize hydrostatic flood forces on exterior walls by allowing for the automatic entry and exit of floodwater. Designs for complying with this requirement must be certified by a licensed professional engineer or architect or provide a minimum of two openings, on at least two sides, with a total net area of not less than one square inch for every square foot of enclosed area subject to flooding:
(1) 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
(2) Openings may be equipped with screens, louvers, valves or other coverings or devices provided they permit the automatic flow of floodwater in both directions without manual intervention.
(Ord. 259, passed 3-17-2011; Ord. 286, passed 12-7-2017)