Other floodplain districts may be established under this chapter and reflected on the Floodplain Zoning Map. These districts may include general floodplain districts and flood storage districts.
A. 
Applicability. The provisions for this district shall apply to all floodplains mapped as A, AO or AH Zones.
B. 
Permitted uses.
(1) 
Pursuant to § 650-19D, it shall be determined whether the proposed use is located within a floodway or flood-fringe area.
(2) 
Those uses permitted in the floodway (§ 650-12 ) and flood-fringe (§ 650-16) districts are allowed within the general floodplain district, according to the standards of § 650-19C, provided that all permits or certificates required under § 650-26 have been issued.
C. 
Standards for development in the general floodplain district. Article III applies to floodway areas; Article IV applies to flood-fringe areas. The rest of this chapter applies to either district.
[Amended 4-21-2022 by Ord. No. 1937-22]
(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, plus one additional foot of freeboard; or
(b) 
If the depth is not specified on the FIRM, to or above three feet above the highest adjacent natural grade.
(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 plans showing adequate drainage paths to guide floodwaters around structures.
D. 
Determining floodway and flood-fringe limits. Upon receiving an application for development within the general floodplain district, 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.
(a) 
A hydrologic and hydraulic study as specified in § 650-26B(3).
(b) 
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.
(c) 
Specifications for building construction and materials, floodproofing, filling, dredging, channel improvement, storage, water supply and sanitary facilities.
The flood storage district delineates that portion of the floodplain where storage of floodwaters has been taken into account and is relied upon to reduce the regional flood discharge. The district protects the flood storage areas and assures that any development in the storage areas will not decrease the effective flood storage capacity which would cause higher flood elevations.
A. 
Applicability. The provisions of this section apply to all areas within the flood storage district (FSD), as shown on the Official Floodplain Zoning Maps.
B. 
Permitted uses. Any use or development which occurs in a flood storage district must meet the applicable requirements in § 650-17.
C. 
Standards for development in flood storage districts.
(1) 
Development in a flood storage district shall not cause an increase equal to or greater than 0.00 of a foot in the height of the regional flood.
(2) 
No development shall be allowed which removes flood storage volume unless an equal volume of storage, as defined by the predevelopment ground surface and the regional flood elevation, shall be provided in the immediate area of the proposed development to compensate for the volume of storage which is lost (compensatory storage). Excavation below the groundwater table is not considered to provide an equal volume of storage.
(3) 
If compensatory storage cannot be provided, the area may not be developed unless the entire area zoned as flood storage district, on this waterway, is rezoned to the flood-fringe district. This must include a revision to the floodplain study and map done for the waterway to revert to the higher regional flood discharge calculated without floodplain storage, as per Article VIII, Amendments, of this chapter.
(4) 
No area may be removed from the flood storage district unless it can be shown that the area has been filled to the flood protection elevation and is contiguous to other lands lying outside of the floodplain.