In all areas of special flood hazards, the following provisions are required for all new construction and substantial improvements:
(1) 
All new construction or substantial improvements shall be designed or modified and adequately anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy;
(2) 
All new construction or substantial improvements shall be constructed by methods and practices that minimize flood damage;
(3) 
All new construction or substantial improvements shall be constructed with materials resistant to flood damage;
(4) 
All new construction or substantial improvements shall be constructed with electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that are designed or located so as to prevent water from entering or accumulating within the components during conditions of flooding;
(5) 
All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system;
(6) 
New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from the systems into floodwaters;
(7) 
On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding;
(8) 
Filling or the disposal of any materials, which will diminish the water flow capacity of any waterway or floodplain defined by this chapter, must be compensated for with remedial action by additional excavation or otherwise so as not to diminish water capacity; and
(9) 
Floodplain engineering and procedures requirements within FEMA or the U.S. Corps of Engineers official flood-prone areas shall conform to the engineering criteria as set out in section 7-111.
(1965 Code, app. B, art. V, sec. A)
In all areas of special flood hazards where base flood elevation data have been provided as set forth in section 7-6, section 7-32(7) or section 7-73(c), the following provisions are required:
(1) 
Residential construction:
New construction or substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to one (1) foot above the base flood elevation. A registered professional civil engineer, registered architect or registered public surveyor shall submit a certification to the city engineer that the standard of this section is satisfied. Floodproofing will not be allowed as a substitute for the lowest floor, including basement, being elevated one (1) foot above the base flood elevation.
(2) 
Nonresidential construction:
New construction or substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor (including basement) elevated to or above the base flood level or, together with attendant utility and sanitary facilities, be designed so that below the base flood level the structure is 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. A registered professional engineer or architect shall develop or review structural design, specifications and plans for the construction and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification, which includes the specific elevation in relation to mean sea level to which such structures are floodproofed, shall be maintained by the floodplain administrator.
(3) 
Enclosures:
New construction and substantial improvements, with 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:
a. 
A minimum of two (2) openings, having a total net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding, shall be provided;
b. 
The bottoms of all openings shall be no higher than one (1) foot above grade;
c. 
Openings may be equipped with screens, louvers, valves or other coverings or devices, provided that they permit the automatic entry and exit of floodwaters.
(4) 
Manufactured homes:
a. 
In accordance with the zoning chapter, modular and manufactured housing is not permitted to be constructed in the city.
b. 
If, in the future, construction of manufactured housing should be permitted, then the following provisions shall apply:
1. 
Require that all manufactured homes to be placed within Zone A shall be installed using methods and practices which minimize flood damage. For the purpose of this requirement, manufactured homes must be elevated and anchored to resist 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. This requirement is in addition to applicable state and local anchoring requirements for resisting wind forces.
2. 
All manufactured homes shall be in compliance with this section.
3. 
Require that all manufactured homes to be placed or substantially improved within Zones A1-30, AH and AE on the community's FIRM be elevated on a permanent foundation, such that the lowest floor of the manufactured home is at or above the base flood elevation, and be securely anchored to an adequately anchored foundation system, in accordance with the provision of paragraph (4) of this section.
(1965 Code, app. B, art. V, sec. B)
(a) 
All subdivision proposals shall be consistent with sections 7-2, 7-3, and 7-4 of this chapter.
(b) 
All proposals for the development of subdivisions shall meet the development permit requirements of section 7-51, section 7-53, and the provisions of this article. No floodproofing of an existing or proposed building in a new subdivision will be allowed as a substitute for providing the proper finished fill elevation above the base flood or twenty-five-year ultimate development flood elevation, whichever is higher. Buildings in a proposed subdivision shall be on land that is above the controlling flood elevation.
(c) 
Base flood elevation data shall be provided for subdivision proposals and other proposed development, if not otherwise provided, pursuant to section 7-6 or section 7-32(7) of this chapter and shall conform to section 7-114.
(d) 
All subdivision proposals shall have adequate drainage provided to reduce exposure to flood hazards and in accordance with the city subdivision regulations.
(e) 
All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed so that they will not affect the existing water surface elevations of the base flood or twenty-five-year ultimate development flood whichever is greater in the area of special flood hazard.
(f) 
All proposed subdivisions must be contiguous to high ground that is not subject to flooding (the base flood or the twenty-five-year ultimate development flood, whichever is higher), i.e., no "island" will be considered for platting, unless adequate connecting structures, capable of passing the base flood or twenty-five-year ultimate development flood whichever is higher, are provided to high ground (not subject to the controlling flood of the same floodplain), and an additional one (1) foot of freeboard is provided to all minimum floor slab elevations.
(g) 
All proposed subdivisions traversed by an area of special flood hazard, as defined in section 7-6, where the "buildable" portion of the subdivision is severed by the floodplain, shall be provided with adequate access. Adequate access shall be a structure that will pass the control flood (base flood or twenty-five-year ultimate development) without overtopping the structure or affecting the upstream property by backwater, and shall not be designed with excessive velocities.
(h) 
Proposed subdivisions that involve the platting of streets shall have at least one (1) access to an unflooded portion of existing dedicated street or roadway.
(i) 
Proposed subdivisions that involve the platting of streets shall have access to an existing dedicated street that is above the base flood or twenty-five-year ultimate development, whichever is greater.
(j) 
Existing channels shall not be increased or decreased from their natural state, until engineering data as described in section 7-111 have been approved by the city engineer. Floodplain engineering and procedures requirements for subdivisions within FEMA or U.S. Corps of Engineers official flood-prone areas shall conform to the engineering criteria as set out in section 7-111.
(1965 Code, app. B, art. V, sec. C)
There are no specific areas within the city designated as shallow flooding. These areas have special flood hazards associated with base flood depths of one (1) to three (3) feet, where a clearly defined channel does not exist and where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow; therefore, should any areas ever be so designated, the following provisions shall apply:
(1) 
All new construction and substantial improvements of residential structures have the lowest floor including basement elevated above the highest adjacent grade, at least as high as the depth number specified in feet on the community's FIRM (at least two (2) feet if no depth number is specified).
(2) 
All new construction and substantial improvements of nonresidential structures:
a. 
Have the lowest floor including basement elevated above the highest adjacent grade, at least as high as the depth number specified in feet on the community's FIRM (at least two (2) feet if no depth number is specified); or,
b. 
Together with attendant utility and sanitary facilities, be designed so that below the base flood level the structure is 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.
(3) 
A registered professional engineer or architect shall submit a certification to the floodplain administrator that the standards of section 7-53 are satisfied.
(4) 
Require within Zone AH or AO adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures.
(1965 Code, app. B, art. V, sec. D)
Located within the areas of special flood hazard established in section 7-6 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles and erosion potentials, the following provisions shall apply:
(1) 
Encroachments are prohibited, including fill, new construction, substantial improvements and other development, unless certification by a professional registered engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels within the community during the occurrence of the base flood discharge.
(2) 
If the preceding paragraph is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this article.
(1965 Code, app. B, art. V, sec. E)