This article applies to all floodfringe areas shown on the floodplain zoning maps and those identified pursuant to § 596-18E.
Section 596-7 shall apply in addition to the following requirements according to the use requested. Any existing structure in the floodfringe must meet the requirements of Article VI, Nonconforming Uses.
A.
Residential uses. Any structure, including a manufactured home, which is to be newly constructed or moved into the floodfringe, shall meet or exceed the following standards. Any existing structure in the floodfringe must meet the requirements of Article VI, Nonconforming Uses;
(1)
All new construction, including placement of manufactured homes, and substantial improvement of residential structures, shall have the lowest floor elevated to or above the flood protection elevation on fill. The fill around the structure shall be one foot or more above the regional flood elevation extending at least 15 feet beyond the limits of the structure. No area may be removed from the Floodfringe District unless it can be shown to meet § 596-17A(2).
(2)
Notwithstanding § 596-17A(1), a basement or crawlspace floor may be placed at the regional flood elevation if the basement or crawlspace is designed to make all portions of the structure below the flood protection elevation 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. No floor of any kind is allowed below the regional flood elevation.
(3)
Contiguous dryland access shall be provided from a structure to land outside of the floodplain, except as provided in Subsection A(4) below.
(4)
In developments where existing street or sewer line elevations make compliance with Subsection A(3) above impractical, the municipality may permit new development and substantial improvements where roads are below the regional flood elevation, if:
(a)
The City has written assurance from police, fire and emergency services that rescue, and relief will be provided to the structure(s) by wheeled vehicles during a regional flood event; or
(b)
The City has a DNR-approved emergency evacuation plan that follows acceptable hazard mitigation planning guidelines.
B.
Accessory structures or uses. In addition to Article II, new construction and substantial improvements of accessory structures shall be constructed on fill with the lowest floor at or above the regional flood elevation.
C.
Commercial uses. In addition to Article II, any commercial structure which is erected, altered, or moved into the floodfringe shall meet the requirements of § 596-17A. Subject to the requirements of § 596-17E, storage yards, surface parking lots and other such uses may be placed at lower elevations if an adequate warning system exists to protect life and property.
D.
Manufacturing and industrial uses. In addition to Article II, any manufacturing or industrial structure which is erected, altered, or moved into the floodfringe shall have the lowest floor elevated to or above the flood protection elevation or meet the floodproofing standards in § 596-26. Subject to the requirements of § 596-17E, storage yards, surface parking lots and other such uses may be placed at lower elevations if an adequate warning system exists to protect life and property.
E.
Storage of materials. Materials that are buoyant, flammable, explosive, or injurious to property, water quality or human, animal, plant, fish, or aquatic life shall be stored at or above the flood protection elevation or floodproofed in compliance with § 596-26. Adequate measures shall be taken to ensure that such materials will not enter the water body during flooding.
F.
Public utilities, streets and bridges. All utilities, streets and bridges shall be designed to be compatible with comprehensive floodplain development plans; and
(1)
When failure of public utilities, streets and bridges would endanger public health or safety, or where such facilities are deemed essential, construction or repair of such facilities shall only be permitted if they are designed to comply with § 596-26.
(2)
Minor roads or nonessential utilities may be constructed at lower elevations if they are designed to withstand flood forces to the regional flood elevation.
I.
Solid waste disposal sites. Disposal of solid or hazardous waste is prohibited in floodfringe areas.
J.
Deposition of materials. Any deposited material must meet all the provisions of this chapter.
K.
Manufactured homes.
L.
Mobile recreational vehicles. All mobile recreational vehicles must be on site for less than 180 consecutive days and be either:
(1)
Fully licensed and ready for highway use. A mobile recreational vehicle is ready for highway use if it is on its wheels or jacking system, is attached to the site only by quick-disconnect utilities and security devices and has no permanently attached additions; or
(2)
Shall meet the elevation and anchoring requirements in § 596-17K(2) and (3).