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// CODE SNIPPET

R322.1.4 Establishing the Design Flood Elevation

Residential Code 2015 of New York State > 3 Building Planning > R322 Flood-Resistant Construction > R322.1 General > R322.1.4 Establishing the Design Flood Elevation
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AMENDMENT
This section has been amended at the state or city level.
The design flood elevation shall be used to define flood hazard areas. At a minimum, the design flood elevation shall be the higher of the following:
  1. The base flood elevation at the depth of peak elevation of flooding, including wave height, that has a 1 percent (100-year flood) or greater chance of being equaled or exceeded in any given year; or
  2. The elevation of the design flood associated with the area designated on a flood hazard map adopted by the community, or otherwise legally designated.
Flood hazard areas shall be established in accordance with Table R301.2(1) footnote g.

R322.1.4.1 Determination of Design Flood Elevations

AMENDMENT
This section has been amended at the state or city level.
If design flood elevations are not specified, the building official is authorized to require the applicant to comply with either of the following:
  1. Obtain and reasonably use data available from a federal, state or other source; or
  2. Determine the design flood elevation in accordance with accepted hydrologic and hydraulic engineering practices used to define special flood hazard areas. Determinations shall be undertaken by a registered design professional who shall document that the technical methods used reflect currently accepted engineering practice. Studies, analyses and computations shall be submitted in sufficient detail to allow thorough review and approval.
Exception: Where it is not possible to obtain a DFE in accordance with Section R322.1.4.1 Items 1 and 2, the DFE shall be 3' (914 mm) above the highest adjacent grade, where the highest adjacent grade is the natural ground elevation within the perimeter of the proposed building prior to construction.

R322.1.4.1.1 Freeboard Requirements for Building Design and Construction

AMENDMENT
This section has been amended at the state or city level.
For the purpose of applying this code and ASCE 24, in all instances where this code or ASCE 24 specifies a construction requirement or building elevation requirement based on the Design Flood Elevation (DFE) determined in accordance with Sections R322.1.4 or R322.1.4.1, such construction requirement or building elevation requirement shall be interpreted to mean the DFE determined in accordance with such section plus a freeboard of 2' (610 mm).

Exception: Freeboard shall not be required when the exception to Section R322.1.4.1 has been applied.

R322.1.4.2 Determination of Impacts

In riverine flood hazard areas where design flood elevations are specified but floodways have not been designated, the applicant shall demonstrate that the effect of the proposed buildings and structures on design flood elevations, including fill, when combined with other existing and anticipated flood hazard area encroachments, will not increase the design flood elevation more than 1 foot (305 mm) at any point within the jurisdiction.

Related Code Sections


R324.1.3 Building Planning, Establishing the Design Flood Elevation
any method established above, the design flood elevation shall be three feet above the highest adjacent grade. Highest adjacent grade is the highest ...
2010 Residential Code of NY > 3 Building Planning > R324 Flood-Resistant Construction > R324.1 General > R324.1.3 Establishing the Design Flood Elevation
R322.1.4.2 Building Planning, Determination of Impacts
In riverine flood hazard areas where design flood elevations are specified but floodways have not been designated, the applicant shall demonstrate ...
Residential Code 2015 of New York State > 3 Building Planning > R322 Flood-Resistant Construction > R322.1 General > R322.1.4 Establishing the Design Flood Elevation > R322.1.4.2 Determination of Impacts
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