ST. LOUIS PUBLIC LIBRARY
PREMIER LIBRARY SOURCES
HOME KIDZONE CATALOG SEARCH BULLET



BULLET St. Louis City Revised Code Chapter 26.76 Flood Plains Areas Article V

St. Louis City Revised Code (annotated) has been converted to electronic format by the staff of the St. Louis Public Library. This electronic version has been done for the interest and convenience of the user. These are unofficial versions and should be used as unofficial copies.

Official printed copies of St. Louis City Revised Code may be obtained from the Register's Office at the St. Louis City Hall.



Chapter 26.76
Flood Plains Areas
Article V. Provisions for flood hazard reduction

Sections:

26.76.051 General standards.
26.76.052 Specific standards.
26.76.053 Manufactured homes.
26.76.054 Floodway.
26.76.055 Recreational vehicles.

26.76.051 General standards.

1. No permit for floodplain development shall be granted for new construction, substantial improvements, and other improvements, including the placement of manufactured homes, within any numbered A zones unless the conditions of this section are satisfied.

2. All areas identified as unnumbered A zones on the FIRM are subject to inundation of the 100-year flood; however, the base flood elevation is not provided. Development within unnumbered A zones is subject to all provisions of the ordinance codified in this chapter. If Flood Insurance Study data is not available, the City shall obtain, review, and reasonably utilize any base flood elevation or floodway data currently available from federal, state, or other sources.

3. Until a floodway is designated, no new construction, substantial improvements, or other development, including fill, shall be permitted within any numbered A zone on the FIRM, unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will not increase the water surface elevation of the base flood more than one foot at any point within the City.

4. All new construction, subdivision proposals, substantial improvements, prefabricated structures, placement of manufactured homes, and other developments shall require:

a. Design or adequate anchorage to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy;

b. Construction with materials resistant to flood damage;

c. Utilization of methods and practices that minimize flood damages;

d. All electrical, heating, ventilation, plumbing, air-conditioning equipment, and other service facilities be designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding;

e. New or replacement water supply systems and/or sanitary sewage systems be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters, and on-site waste disposal systems be located so as to avoid impairment or contamination; and

f. Subdivision proposals and other proposed new development, including manufactured home parks or subdivisions, located within special flood hazard areas are required to assure that:

(1) All such proposals are consistent with the need to minimize flood damage;

(2) All public utilities and facilities, such as sewer, gas, electrical, and water systems are located and constructed to minimize or eliminate flood damage;

(3) Adequate drainage is provided so as to reduce exposure to flood hazards; and

(4) All proposals for development, including proposals for manufactured home parks and subdivisions, of five (5) acres or fifty (50) lots, whichever is lesser, include within such proposals base flood elevation data.

5. Storage, material, and equipment

a. The storage or processing of materials within the special flood hazard area that are in time of flooding buoyant, flammable, explosive, or could be injurious to human, animal, or plant life is prohibited.

b. Storage of other material or equipment may be allowed if not subject to major damage by floods, if firmly anchored to prevent flotation, or if readily removable from the area within the time available after a flood warning.

6. Accessory Structures. Structures used solely for parking and limited storage purposes, not attached to any other structure on the site, of limited investment value, and not larger than 400 square feet, may be constructed at-grade and wet-floodproofed provided there is no human habitation or occupancy of the structure; the structure is of single-wall design; a variance has been granted from the standard floodplain management requirements of this chapter; and a floodplain development permit has been issued.
(Ord. 65420 1 (part), 2001.)

26.76.052 Specific standards.

1. In all areas identified as numbered A zones, where base flood elevation data have been provided, as set forth in Section 26.76.051(2), the following provisions are required:

a. Residential Construction. New construction or substantial-improvement of any residential structures, including manufactured homes, shall have the lowest floor, including basement, elevated to one (1) foot above base flood elevation.

b. Non-Residential Construction. New construction or substantial-improvement of any commercial, industrial, or other non-residential structures, including manufactured homes, shall have the lowest floor, including basement, elevated to a minimum of one (1) foot above the base flood elevation or, together with attendant utility and sanitary facilities, be floodproofed so that below the base flood elevation 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 certify that the standards of this subsection are satisfied. Such certification shall be provided to the Floodplain Administrator as set forth in Section 26.76.033(9).

c. Require, for all new construction and substantial improvements, that fully enclosed areas below lowest floor used solely for parking of vehicles, building access, or storage in an area other than a basement and 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 flood waters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria:

(1) A minimum of two 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; and

(2) The bottom of all opening shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of flood waters.
(Ord. 65420 1 (part), 2001.)

26.76.053 Manufactured homes.

1. All manufactured homes to be placed within numbered A zones on the City's FIRM shall be required to be installed using methods and practices that minimize flood damage. For the purposes 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.

2. Require manufactured homes that are placed or substantially improved within numbered A zones, on the City's FIRM on sites:

a. Outside of manufactured home park or subdivision;

b. In a new manufactured home park or subdivision;

c. In an expansion to and existing manufactured home park or subdivision; or

d. In an existing manufactured home park or subdivision on which a manufactured home has incurred substantial-damage as the result of a flood, be elevated on a permanent foundation such that the lowest floor of the manufactured home is elevated to one (1) foot above the base flood elevation and be securely attached to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.

3. Require that manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision within all numbered A zones on the City's FIRM, that are not subject to the provisions of Section 26.76.053 (2) of this chapter, be elevated so that either:

a. The lowest floor of the manufactured home is at a minimum of one (1) foot above the base flood level; or

b. The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than thirty-six (36) inches in height above grade and be securely attached to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.
(Ord. 65420 1 (part), 2001.)

26.76.054 Floodway.

Located within areas of special flood hazard established in Section 26.76.021 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters that carry debris and potential projectiles, the following provisions shall apply:

1. The City has selected and adopted a regulatory floodway based on the principle that the area chosen for the regulatory floodway be designed to carry the waters of the base flood without increasing the water surface elevation of that flood more than one foot at any point.

2. The City hereby prohibits any encroachments, including fill, new construction, substantial- improvements, and other development within the adopted regulatory floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in flood levels within the City during the occurrence of the base flood discharge.

3. All new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Section 26.76.050.
(Ord. 65420 1 (part), 2001.)

26.76.055 Recreational vehicles.

1. Require that recreational vehicles placed on sites within all numbered A zones on the City's FIRM either:

a. Be on the site for fewer than 180 consecutive days, or

b. Be fully licensed and ready for highway use; or

c. Meet the permitting, elevation, and the anchoring requirements for manufactured homes of the ordinance codified in this chapter.

A 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.
(Ord. 65420 1 (part), 2001.)

Return to Top of Charter, Code, and Ordinances.
Return to Title 26
Return to Code Table of Contents

HOME | KIDZONE | CATALOG | CONTACT US | SEARCH | HINTS