For issuance of an FDP in the flood fringe, all new construction and substantial improvement, development or other use shall conform to the following standards:
A. Fill: Any proposed fill to be deposited in the flood fringe shall be in conjunction with permitted and special uses and shall be protected against erosion.
B. Structures: In order to minimize flood damage the following standards shall apply:
1. Wherever possible, structures shall be constructed with the long axis parallel to the direction of flood flow;
2. As practicable, structures shall be placed approximately on the same flood flow lines as those of adjoining structures;
3. Structures shall be firmly anchored to prevent flotation;
4. Residential structures shall be constructed on fill, piers, posts, or pilings so that the lowest floor surfaces including basements or cellars together with mechanical and utility equipment shall be at or above one foot (1') above the base flood elevation and be constructed of materials resistant to flood damage;
5. Nonresidential structures shall be constructed on fill, piers, posts, or pilings so that the lowest floor surfaces including basements or cellars together with mechanical and utility equipment are elevated or floodproofed to at least one foot (1') above the base flood elevation and be constructed of materials resistant to flood damage.
C. Subdivisions: See chapter 8 of this title.
D. Manufactured Homes:
1. All manufactured homes to be placed or substantially improved on an individually owned lot or in a manufactured home park or subdivision shall be elevated on a permanent foundation such that the lowest floor of the manufactured home including basement or cellar shall be at least one foot (1') above the base flood elevation and be securely anchored to an adequately anchored foundation system in accordance with the provisions of section 4-1-10 of this code and the Illinois mobile home tie down act issued pursuant to 77 Illinois administrative code section 870. If a manufactured home is elevated on pilings, the piling foundations shall be placed in stable soil no more than ten feet (10') apart and reinforcement shall be provided for pilings more than six feet (6') above ground level.
2. In the event it is not possible for the city to determine the base flood elevation in an area designated as zone A on the flood insurance rate map, Carbondale, Illinois, dated May 2, 2008, the manufactured home shall be installed using methods and practices which minimize flood damage. For the purposes of this requirement, manufactured homes must be elevated on a permanent foundation 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.
E. Mechanical And Utility Equipment: All new construction and substantial improvement to mechanical and utility equipment including electrical, heating, ventilation, plumbing, air conditioning equipment, utility meters and other service facilities including water supply and wastewater disposal systems shall be elevated or floodproofed to at least one foot (1') above the base flood elevation and constructed of materials resistant to flood damage. All new and replacement on site waste disposal systems shall be located to prevent impairment to them or contamination from them during flooding.
F. Storage Of Materials Or Equipment: Material or equipment may be stored in the flood fringe if firmly anchored to prevent flotation, if readily removable from the area within the time available after flood warning, or if stored one foot (1') or more above the base flood elevation.
G. Fully Enclosed Areas Below Lowest Floor: Fully enclosed areas, usable solely for the parking of vehicles, building access or storage in an area other than a basement, that are 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 an Illinois registered professional engineer or an Illinois registered architect or must meet or exceed the following minimum criteria:
1. A minimum of two (2) openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided.
2. The bottom of all openings shall be no higher than one foot (1') above grade.
3. Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
H. Public Utilities: Public utilities and facilities such as sewer, gas, electric, and water systems shall be located and constructed to minimize or eliminate flood damage. New or replacement public sanitary sewer systems and water supply systems shall be located and constructed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into floodwaters.
I. Travel Trailers: All travel trailers (recreational vehicles) placed on property within the flood fringe shall be elevated with the lowest floor at or above the base flood elevation and be subject to elevation and anchoring requirements of "manufactured homes"; or be on site for less than one hundred eighty (180) consecutive days and be fully licensed and road ready. To be considered fully road ready, the trailer must be on wheels or a jacking system, be attached to the site only by quick disconnect type utilities and security devices, and have no permanently attached additions.
J. Variance Procedure: Upon application and after fifteen (15) days' notice of a public hearing, the city council may grant a floodplain variance subject to compliance with the provisions of section 60.6 of the NFIP rules and regulations as amended and such other conditions as the city council deems necessary to comply with the intent of this district. The issuance of variances shall be for floodplain management purposes only.
K. Watercourse Standards: The development services director shall notify adjacent communities and the Illinois department of natural resources, office of water resources and the federal insurance administration prior to dry alteration or relocation of a watercourse. The flood carrying capacity within the altered or relocated portion of any watercourse shall be maintained.
L. Reports And Records:
1. The development services director shall provide the city council, the Illinois department of natural resources, office of water resources, and the federal insurance administration with an annual report on forms as provided to the city by the federal insurance administration.
2. The planning services division shall maintain the records of lowest floor elevations, floodproofing certifications, and all variance documents required by the federal insurance administration.
M. Disclaimer Of Liability: The degree of protection required by this section is considered reasonable for regulatory purposes and is based on available information derived from engineering and scientific methods of study. Larger floods may occur or flood heights may be increased by manmade or natural causes. This section does not imply that development either inside or outside the floodplain will be free from flooding or damage. This section does not create liability on the part of the city or any officer or employee thereof for any flood damage that results from proper reliance on this section or any administrative decision made lawfully thereunder.
N. Identification Required: It is a requirement of the NFIP that regulatory floodway is identified. Within any floodway identified on the flood insurance rate map, and within all other floodplains where a floodway has not been delineated, the following standards shall apply:
1. No development shall be allowed which, acting in combination with existing and anticipated development will cause any increase in flood heights or velocities or threat to public health and safety. These developments are outlined by the IDNR/OWR statewide permit 2-13.
2. The floodway for the floodplains of Crab Orchard Creek, Glade Creek, Little Crab Orchard Creek, Piles Fork Creek, and Carbondale Reservoir shall be as delineated on the countywide flood insurance rate map as prepared by FEMA. The floodways for each of the remaining floodplains of Carbondale shall be according to the best data available from federal, state, or other sources. (Ord. 2013-20)