D.C. Mun. Regs. tit. 12, app 12-A-G r. 12-A-G501
Elevation. All new and replacement manufactured homes to be placed or substantially improved on a development site that is located wholly or partially within a flood hazard area shall be elevated such that the lowest floor of the manufactured home is elevated to or above the design flood elevation.
Foundations. All new and replacement manufactured homes, including substantial improvement of existing manufactured homes, shall be placed on a permanent, reinforced foundation on a development site that is located wholly or partially within a flood hazard area that is designed in accordance with Section R322 of the Residential Code.
Anchoring. All new and replacement manufactured homes to be placed or substantially improved on a development site that is located wholly or partially within a flood hazard area shall be installed using methods and practices that minimize flood damage. Manufactured homes shall be securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement. Methods of anchoring are authorized to 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.
Protection of mechanical equipment and outside appliances. Mechanical equipment and outside appliances for any proposed development on a development site that is located wholly or partially within a flood hazard area shall be elevated to or above the design flood elevation.
Exceptions: Where such equipment and appliances are designed and installed to prevent water from entering or accumulating within their components and the systems are constructed to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding up to the elevation required by Section R322 of the Residential Code, the systems and equipment shall be permitted to be located below the elevation required by Section R322 of the Residential Code. Electrical wiring systems shall be permitted below the design flood elevation provided they conform to the provisions of NFPA 70.
Enclosures. Fully enclosed areas below elevated manufactured homes that are located wholly or partially within a flood hazard area shall comply with the requirements of Section R322 of the Residential Code.
D.C. Mun. Regs. tit. 12, app 12-A-G r. 12-A-G501