714.11, 714.12, 714.14

Be constructed entirely of flood resistant materials below the regulatory flood protection elevation.

Include, in Zones A and AE measures to automatically equalize hydrostatic flood forces on walls by allowing for the entry and exit of floodwaters. To meet this requirement, the openings must either be certified by a professional engineer or architect or meet the following minimum design criteria: Provide a minimum of two (2) openings on different sides of each enclosed area subject to flooding. The total net area of all openings must be at least one (1) square inch for each square foot of enclosed area subject to flooding. If a building has more than one (1) enclosed area, each area must have openings to allow floodwaters to automatically enter and exit. The bottom of all required openings shall be no higher than one (1) foot above the adjacent grade. Openings may be equipped with screens, louvers, or other opening coverings or devices, provided they permit the automatic flow of floodwaters in both directions. Foundation enclosures made of flexible skirting are not considered enclosures for purposes of this Section 714, and, therefore, do not require openings. Masonry or wood underpinning, regardless of structural status, is considered an enclosure and requires openings as outlined above.

Fully enclosed areas of new construction or substantially improved structures, which are below the regulatory flood protection elevation shall not be designed or used for human habitation, but shall only be used for parking of vehicles, building access, or limited storage of maintenance equipment used in connection with the premises.

The modification, alteration, repair, reconstruction or improvement of any kind to a structure or use, regardless of its location within the Flood Hazard Overlay District, to an extent or amount of fifty (50) percent or more of its market value shall be undertaken only in full compliance with the provisions of this Section 714, and the entire structure shall conform to the requirements of the USBC.

All manufactured homes placed, or substantially improved: (i) on individual lots or parcels, (ii) in expansions to existing manufactured home parks or subdivisions, and (iii) in a new or existing manufactured home park or subdivision, in which a manufactured home has incurred substantial damage as the result of a flood, must meet all the requirements for new construction, including all applicable elevation and anchoring requirements established by the USBC and this ordinance.

All recreational vehicles placed on sites must: (i) Be on the site for fewer than one hundred eighty (180) consecutive days; (ii) Be fully licensed and ready for highway use such that it is on its wheels or a jacking system, is attached to the site only by quick disconnect type utilities and security devices, and has no permanently attached additions; or (iii) Meet all the applicable building code requirements for manufactured homes.

New construction or substantial improvement of any residential structure, including manufactured homes, shall have the lowest floor, including basement, elevated one (1) foot above base-flood elevation.

Historic structures undergoing repair or rehabilitation that would constitute a substantial improvement as defined here in shall comply with all requirements of this Section 714 that do not preclude the structure's continued designation as a historic structure.

New construction and substantial improvements shall be constructed in accordance with the USBC and this ordinance, including being properly anchored to prevent flotation, collapse or lateral movement of the structure.

All storm drainage facilities shall be designed to convey the flow of surface water without damage to persons or property. The system shall be structured to direct drainage away from buildings and on-site waste disposal sites. The Floodplain Administrator may require a primarily underground system to accommodate larger, less frequent floods.

New construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.

Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement. Methods of anchoring may include, but are not limited to, use of over-the-top or frame ties to ground anchors.

New construction or substantial improvements shall be constructed by methods and practices that minimize flood damage.

New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters.

All new replacement sanitary sewer facilities and private package sewage treatment plants, including all pumping stations of flood waters into the systems and discharges from the systems into the flood waters, shall be located and constructed to minimize or eliminate flood damage and impairments.

Electrical, heating, ventilation, plumbing, air conditioning equipment and other service facilities, including duct work, shall be designed or located so as to prevent water from entering or accumulating within the components during conditions of flooding.

Streets and sidewalks shall be designed to minimize their potential for increasing and aggravating the levels of flood flow. Drainage openings shall be designed to sufficiently discharge flood flows without unduly increasing flood heights.

All subdivision proposals shall be consistent with the need to minimize flood damage; All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage; All subdivision proposals shall have adequate drainage provided to reduce exposure to flood hazards; Base flood elevation data shall be obtained from other sources or developed using detailed methodologies, hydraulic and hydrologic analysis, comparable to those contained in a FIS for subdivision proposals and other proposed development proposals (including manufactured home parks and subdivisions) that exceed fifty (50) lots or five (5) acres, whichever is the lesser.

All utilities such as gas lines, electrical and telephone systems shall be located, elevated (if possible), and constructed to minimize the chance of impairment during a flooding occurrence.

On-site waste disposal systems shall be located and constructed to avoid impairment to them or contamination from them during flooding.

All new or replacement facilities shall be designed to minimize or eliminate flood damages.

New and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system.