A. 
Applicability. The provisions for the General Floodplain District shall apply to development in all riverine floodplains mapped as A, AO, AH, and in AE Zones within which a floodway is not delineated on the Flood Insurance Rate Maps identified in § 430-1.5B(1), and to Coastal AE and AO Zones as specified in this § 430-5.1.
B. 
Floodway boundaries. For proposed development in a riverine Zone A, or in a riverine Zone AE within which a floodway is not delineated on the Flood Insurance Rate Map identified in § 430-1.5B(1), the boundaries of the regulatory floodway shall be determined pursuant to § 430-5.1E. If the development is proposed to encroach upon the regulatory floodway or the regulatory floodfringe, the development is subject to the standards of Article III.
C. 
Permitted uses. Pursuant to § 430-5.1E it shall be determined whether the proposed use is located within the floodway or floodfringe. Those uses permitted in the Floodway and Floodfringe Districts (§ 430-3.2) are allowed within the General Floodplain District, according to the standards of § 430-5.1D provided that all permits or certificates required under § 430-7.1 have been issued.
D. 
Standards for development in the general floodplain district. Article III applies to floodway and floodfringe areas, determined to pursuant to § 430-5.1E; Article IV applies to Coastal AE and AO Zones.
(1) 
New construction and substantial improvement of structures in Zone AO shall have the lowest floor, including basement, elevated:
(a) 
To or above the depth, in feet, as shown on the FIRM above the highest adjacent natural grade; or
(b) 
If the depth is not specified on the FIRM, two feet above the highest adjacent natural grade or higher.
(2) 
New construction and substantial improvement of structures in Zone AH shall have the lowest floor, including basement, elevated to or above the flood protection elevation.
(3) 
In AO/AH Zones, provide adequate drainage paths to guide floodwaters around structures.
(4) 
All development in Zones AO and Zone AH shall meet the requirements of Article IV.
E. 
Determining floodway and floodfringe limits. Upon receiving an application for development within Zone A, or within a riverine Zone AE where a floodway has not been delineated on the Flood Insurance Rate Maps, the Zoning Administrator shall:
(1) 
Require the applicant to submit two copies of an aerial photograph or a plan which shows the proposed development with respect to the general floodplain district limits, stream channel, and existing floodplain developments, along with a legal description of the property, fill limits and elevations, building floor elevations and floodproofing measures; and the flood zone as shown on the FIRM.
(2) 
Require the applicant to furnish any of the following information deemed necessary by the Department to evaluate the effects of the proposal upon flood height and flood flows, regional flood elevation and to determine floodway boundaries.
(3) 
A hydrologic and hydraulic study as specified in § 430-7.1B(3).
(a) 
Plan (surface view) showing elevations or contours of the ground; pertinent structure, fill or storage elevations; size, location and layout of all proposed and existing structures on the site; location and elevations of streets, water supply, and sanitary facilities; soil types and other pertinent information;
(b) 
Specifications for building construction and materials, floodproofing, filling, dredging, channel improvement, storage, water supply and sanitary facilities.
A. 
Applicability. The provisions of this section apply to all Coastal Floodplain Districts (CFD) shown on the floodplain zoning maps, which includes Zones V, V1-30, and VE. Where a floodway shown on the floodplain zoning maps, or a floodway determined as explained in § 430-1.5C(4) or a regulatory floodway identified pursuant to § 430-5.1E, extends into a Coastal Floodplain District, development shall comply with the standards of Article III and § 430-5.3.
B. 
Standards for development in the Coastal Floodplain District. Development in the CFD district shall meet the requirements of Article II, as well as the following:
(1) 
New construction shall be located landward of the ordinary high water mark.
(2) 
Bulkheads, seawalls, revetments, and other erosion control measures shall not be connected to the foundation or superstructure of a building and shall be designed and constructed so as not to direct floodwaters or increase flood forces or erosion impacts on the foundation or superstructure of any building. Compliance with this requirement shall be documented in an engineering report.
(3) 
Man-made alterations of sand dunes are prohibited unless an engineering report documents that the alterations will not increase potential flood damage by reducing the wave and flow dissipation characteristics of the sand dunes.
(4) 
The use of fill for structural support of buildings is prohibited.
(a) 
Nonstructural fill shall be permitted only if an engineering report demonstrates that the fill will not cause run-up, ramping, or deflection of floodwaters that cause damage to buildings.
(5) 
New construction and substantial improvement of buildings shall be elevated, consistent with § SPS 321.34, Wis. Adm. Code, on pilings or columns so that the bottom of the lowest horizontal structural member of the lowest floor (excluding the pilings or columns) is elevated to or above the flood protection elevation.
(a) 
The pile or column foundation and structure attached thereto shall be anchored to resist flotation, collapse, and lateral movement due to the effects of wind and water loads acting simultaneously on all building components. Water loading values shall be those associated with the base flood. Wind loading values shall be those defined according to American Society of Civil Engineers 7-16 Minimum design loads and associated criteria for buildings and other structures, or other equivalent standard.
(b) 
A registered professional engineer or architect shall develop or review the structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction to be used are in accordance with accepted standards of practice for meeting the provisions of § 430-5.3B(5).
(6) 
New construction and substantial improvement of buildings shall have the space below the lowest floor either free of obstruction or constructed with nonsupporting breakaway walls, open wood latticework, or insect screening intended to collapse without causing collapse, displacement, or other structural damage to the elevated portion of the building or supporting foundation system.
(a) 
For the purpose of § 430-5.3B(6), a breakaway wall shall have a design safe loading resistance of not less than 10 pounds and not more than 20 pounds per square foot.
(b) 
Use of breakaway walls which exceed a design safe loading resistance of 20 pounds per square foot (either by design or where so required by local or state codes) may be permitted only if a registered professional engineer or architect certifies that the designs proposed meet all of the following conditions:
[1] 
Breakaway wall collapse shall result from a water load less than that which would occur during the base flood; and
[2] 
The elevated portion of the building and supporting foundation system shall not be subject to collapse, displacement, or other structural damage due to the effects of wind and water loads acting simultaneously on all building components (structural and nonstructural). Water loading values shall be those associated with the base flood. Wind loading values shall be those defined according to American Society of Civil Engineers 7-16 Minimum design loads and associated criteria for buildings and other structures, or equivalent standard.
(c) 
All space enclosed by breakaway walls, open wood latticework, or insect screening below the lowest floor shall be used solely for parking, building access, or storage.
(7) 
Require within flood-prone areas:
(a) 
New and replacement water supply systems to be designed to minimize or eliminate infiltration of floodwaters into the systems; and
(b) 
New and replacement sanitary sewage systems to be designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into floodwaters and on-site waste disposal systems to be located to avoid impairment to them or contamination from them during flooding.
(8) 
All mobile recreation vehicles must be on site for less than 180 consecutive days and be either:
(a) 
Fully licensed and ready for highway use; or
(b) 
Shall meet the standards of § 430-5.3B(1) through (7), inclusive.
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 type utilities and security devices, and has no permanently attached additions.
(9) 
Manufactured homes placed or substantially improved within the Coastal Floodplain District shall meet the standards of § 430-5.3B(1) through (7), inclusive.