(a) Standards of Construction. The following standards are required in all areas of special flood hazards:

(1) Anchoring.

(A) All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.

(B) All manufactured homes shall meet the anchoring standards of Section 8B-4(d).

(2) Construction Materials and Methods.

(A) All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.

(B) All new construction and substantial improvements shall be constructed with electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that area designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.

(3) Elevation and Floodproofing.

(A) New construction and substantial improvement of any structure shall have the lowest floor, including basement, elevated a minimum one foot above the base flood elevation. Nonresidential structures may meet standards in Section 8B-4(a)(3)(C). Upon the completion of the structure the elevation of the lowest floor, including the basement, shall be certified by a registered professional engineer or surveyor and verified by the community building inspector to be properly elevated. Such certification and verification shall be provided to the floodplain administrator.

(B) Nonresidential construction shall either be elevated in conformance with Section 8B-4(a)(3)(A) or, structure together with attendant utility and sanitary facilities:

(i) Be floodproofed so that from one foot above and below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;

(ii) Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and

(iii) Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certification shall be provided to the floodplain administrator.

(C) Require, for all new construction and substantial improvements, that fully enclosed areas below the lowest floor that 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. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria:

(i) Either a minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may equipped with screens, louvers, valves or other coverings or devices, provided that they permit the automatic entry and exit of floodwaters;

(ii) Be certified to comply with a local floodproofing standard approved by the Federal Insurance Administration.

(D) Manufactured homes shall also meet the standards in Section 8B-4(d).

(b) Standards for Utilities.

(1) All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from systems into floodwaters.

(2) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.

(c) Standards for Subdivisions.

(1) All preliminary subdivision proposals shall identify the flood hazard area and the elevation of the base flood.

(2) All final subdivision plans will provide the elevation of proposed structures and pads. If the site is filled above the base flood, the final pad elevation shall be certified by a registered professional engineer or surveyor and provided to the floodplain administrator.

(3) All subdivision proposals shall be consistent with the need to minimize flood damage.

(4) All subdivision proposals shall have public utilities and facilities, such as sewer, gas, electrical and water systems, located and constructed to minimize flood damage.

(5) All subdivisions shall provide adequate drainage to reduce exposure to flood hazards.

(d) Standards for Manufactured Homes. All new and replacement manufactured homes and additions to manufactured homes shall:

(1) Be elevated so the lowest floor is elevated to a minimum of one foot above the base flood elevation; and

(2) Be securely anchored to a permanent foundation system to resist flotation, collapse or lateral movement.

(e) Floodways. Located within areas of special flood hazard established in Section 8B-2 are areas designated as floodways. Since the floodway is an extremely hazardous area, due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply:

(1) Prohibit encroachments including fill, new construction, substantial improvements and other development, unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.

(2) If Section 8B-4(e)(1) is satisfied, all new construction and substantial improvements shall comply with all other applicable flood hazard reduction provisions of Section 8B-4. (Ord. No. 1651, Exh. A (part).)