Oklahoma Administrative Code
Title 785 - Oklahoma Water Resources Board
Chapter 55 - Development on State Owned or Operated Property Within Floodplains and Floodplain Administrator Accreditation
Subchapter 3 - Development on State Owned or Operated Property Within the Floodplains
Section 785:55-3-2 - Development in the regulatory floodplain with base flood elevations determined
Current through Vol. 41, No. 13, March 15, 2024
(a) Applicability of section. In addition to the criteria and requirements set forth in 785:55-3-1 and 785:55-3-4 herein, all developments within the regulatory floodplain where base flood elevations have been determined shall comply with the criteria and requirements of this section.
(b) Use of base flood elevations. The Board shall obtain, review and utilize any base flood elevation and floodway data available from a federal, state, or other source, including data developed pursuant to 785:55-3-1(g), as criteria for requiring that new construction, substantial improvements, or other development in the regulatory floodplain meets the requirements of these Rules as applicable.
(c) Floor and floodproof elevations. The applicant shall obtain and provide the Board with the elevation (in relation to mean sea level) of the lowest floor (including basement) of all new and substantially improved structures. If the structure has been floodproofed in accordance with (i)(2) and (j) of this section, the applicant shall obtain and provide the Board with the elevation (in relation to mean sea level) to which the structure was floodproofed.
(d) Flood carrying capacity of altered watercourse. The Board shall assure that the flood carrying capacity within the altered or relocated portion of any watercourse is maintained.
(e) Manufactured home installation in general. All manufactured homes which are to be placed within a regulatory floodplain shall be installed using methods and practices which 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 to be limited to, use of over-the-top frame ties to ground anchors. This requirement is in addition to applicable state and local anchoring requirements for resisting wind forces.
(f) Manufactured home with permanent foundations. anufactured homes that are placed or substantially improved on sites within a regulatory floodplain shall be elevated on a permanent foundation such that the lowest floor of the manufactured home is elevated at least one (1) foot above the base flood elevation and be securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement where the manufactured home is located as follows:
(g) Manufactured homes without permanent foundations. Manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision within regulatory floodplains that are not subject to the provisions of (f) of this section shall be elevated so that either:
(h) Other residential structures. All new construction and substantial improvements of residential structures within the regulatory floodplain shall have the lowest floor (including basement) elevated at least one (1) foot above the base flood elevation.
(i) Non-residential structures. All new construction and substantial improvements of non-residential structures within regulatory floodplains shall:
(j) Non-residential floodproofing. Where a non-residential structure is intended to be made watertight below the base flood elevation, the following shall apply:
(k) Enclosed areas below lowest floor. For all new construction and substantial improvements:
(l) Recreational vehicles. Recreational vehicles placed on sites within regulatory floodplains shall:
Amended at 10 Ok Reg 3369, eff 6-25-93; Amended at 14 Ok Reg 2808, eff 7-1-97