(a) General Standards. In all areas of special flood hazard the following standards are applicable:
(1) All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure from resulting hydrodynamic and hydrostatic loads, including the effects of buoyancy.
(2) All new construction and substantial improvements shall be constructed with materials resistant to flood damage, using methods and practices that minimize flood damage, and with electrical, heating, ventilation, plumbing and air-conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.
(3) All new and replacement water supply systems shall be designed to eliminate infiltration of flood waters into the systems.
(4) All new and replacement individual wastewater treatment systems shall be designed to eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters and shall be located to avoid impairment to them or contamination from them during flooding.
(5) All subdivision proposals shall be consistent with the need to minimize flood damage.
(b) Specific Standards. In all areas of special flood hazards, the following provisions are applicable:
(1) New construction and substantial improvement of any residential structure shall have the lowest floor, including the basement, elevated to or above the base flood elevation, data for which shall be provided, without the use of earth or other fill.
(2) An exemption to the elevation standard may be granted for accessory structures (e.g. sheds, barns, detached garages). Such structures shall comply with the encroachment provisions of paragraph (c)(1) hereof. In addition, such accessory structures shall not be used for human habitation; shall be designed to have low flood damage potential; shall be constructed and placed on the building site so as to offer the minimum resistance to the flow of flood waters; shall be firmly anchored to prevent flotation; and shall have service facilities, such as electrical and heating equipment, floodproofed.
(3) The following provisions apply to all new and substantially improved residential structures which are elevated to or above the base flood elevation, using pilings, columns or posts, or which contain a crawl space. These structures may enclose the area below the base flood elevation, provided the following conditions are met:
A. Fully enclosed areas below the base flood elevation shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of flood water. Designs for meeting this requirement shall be certified by a registered professional engineer or architect.
B. Alternatively, a minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers or other coverings or devices, provided that they permit the automatic entry and exit of floodwater. Any enclosure which meets these criteria shall be considered as having met the requirements of paragraph (a)(1) hereof.
(c) Encroachments. Since a floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
(1) Encroachments, including fill, new construction, substantial improvements and other development, are prohibited in a floodway unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
(2) If paragraph (c)(1) hereof is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this section.
(Ord. 1992-101. Passed 1-14-92.)