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Projects & Proposals > Citywide > Flood Resilience Zoning

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Flood Resilience Zoning Text Amendment
Frequently Asked Questions

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  1. Q: What are flood zones?

    A: Flood zones are land areas identified by the Federal Emergency Management Agency (FEMA). Each flood zone describes that land area in terms of its risk of flooding.

  2. Q: Are City evacuation zones different than FEMA flood zones?

    A: Evacuation zones and flood hazard areas are different. New York City's hurricane contingency plans are based on six evacuation zones (1-6). To find out if you live in a hurricane evacuation zone, use the Hurricane Evacuation Zone Finder, or call 311.

  3. Q: How do I know if I am in a flood zone?

    A: FEMA creates and updates flood maps for New York City and has created a website to provide the most up to date information regarding flood risk for particular locations throughout the five boroughs. On their website, you can view the latest flood risk information for your property, as well as the currently adopted Flood Insurance Rate Maps. To find this information for your specific address, go to www.region2coastal.com/sandy/table. If the marker on the website does not find your exact house address, but it is close, click on the marker and drag it over your home’s location to find the flood elevation.

  4. Q: Why are FEMA flood maps changing? Which flood maps should I be referring to?

    A:
    Building code requirements are based on the FEMA Flood Insurance Rate Maps (FIRMs), which were last updated in 2007. FEMA began the process of updating these maps before Hurricane Sandy, but new FIRMs have not yet been issued. Following Hurricane Sandy, FEMA has issued Preliminary Work Maps, which provide the best currently available information on flood risk. These maps are accessible at www.region2coastal.com. As part of the FIRM update process, FEMA will be releasing preliminary FIRMs as part of its formal public review  process. As FEMA releases new, more accurate flood maps, these will be posted on their website. The proposed zoning text amendment enables buildings to be designed and constructed based on the most recent available base flood elevation data from FEMA.

  5. Q: What are flood-resistant construction standards?

    A: Flood-resistant construction standards are minimum requirements for construction in the flood zone established by the Federal Emergency Management Agency (FEMA), the New York State Building Code and the City’s Building Code.  These standards require that flood-resistant materials be used for parts of buildings that are susceptible to water damage, that certain buildings and uses be elevated above anticipated flood levels and that buildings are designed to withstand the pressure of waves, when necessary. Flood-resistant construction standards are defined in Appendix G of the NYC Building Code and the American Society of Civil Engineers’ Flood Resistant Design and Construction manual, referred to as ASCE 24.

  6. Q: Will this zoning amendment require me to reconstruct my home to meet flood resistant construction standards?

    A: No, the purpose of this zoning amendment is to remove barriers and restrictions on property owners to allow them to rebuild. Nothing in this amendment will mandate that a property owner change their existing home. Where a property owner is required to meet flood-resistant construction standards by the Building Code, this amendment offers zoning relief to ensure that a property can be rebuilt as it was before the storm, but more resiliently.

  7. Q: If my building wasn’t substantially damaged, why is this text amendment important to me?

    A: While it may not be necessary to make changes immediately to a building that wasn’t damaged, FEMA has recently identified a greater risk of flooding for many New York City properties.  In addition, there is a risk of increased flood insurance premiums in the future for buildings that do not comply with flood-resistant construction standards. For this reason, this amendment could provide important zoning relief to allow property owners to adapt buildings and reduce the risk of increased premiums. Buildings built with their lowest floor level above the required elevation could save thousands of dollars annually in insurance premiums compared to buildings that are built below this elevation. More information on flood insurance is available from FEMA at www.floodsmart.gov.

  8. Q: What is the difference between A, V, Coastal A, and X zones?

    A: FEMA identifies different flood hazard designations to differentiate potential flood risks. A, V, and Coastal A zones are all part of the 1% annual chance flood zone, within which FEMA requirements for flood insurance and Building Code requirements for flood-resistant construction apply.

    A Zone:  comprised of the area subject to flooding from the 1% annual chance flood. These areas are not subject to high velocity wave action but are still considered high risk flooding areas. In A zones, building code requires buildings to be elevated or flood-proofed based on the base flood elevation identified on the FEMA maps. A Zones can also be shown as AE, AH or AO on FEMA flood maps.

    V Zone: comprised of the area subject to high velocity wave action (a breaking wave 3 feet high or larger) from the 1% annual chance coastal flood. Zone V is subject to more stringent building requirements than other zones because of the damaging force of waves. V Zones can also be shown as VE on FEMA flood maps.

    Coastal A Zone: The portion of the A zone where base flood wave heights are expected to be between 1.5 and 3 feet high. This zone is indicated by the Limit of Moderate Wave Action (LiMWA) Line on the latest FEMA flood maps. This zone is being mapped by FEMA for the first time in New York City, and does not appear on the currently effective (2007) Flood Insurance Rate Maps. Currently, the Building Code requirements for Coastal A zones are the same as for A zones.

    Shaded X  Zone: comprised of the area of moderate flood risk outside the regulatory 1% annual chance flood but within the limits of the 0.2% annual chance flood level (one in 500 chance). There are no current Building Code or FEMA flood insurance requirements for buildings in this zone.

  9. Q: Is the elevation on the latest FEMA map the height that I need to raise my building?

    A: The elevation on the latest FEMA flood map is an absolute measurement of height, not a measurement of flood height above the level of the ground at your property.  To determine the height that your building must be raised above grade, you need to subtract the absolute height of grade. The building code also requires an additional 1 to 2 feet of elevation as a measure of safety, called freeboard (see below). Note that the 2007 FEMA maps and the more recent FEMA maps measure height from a different “datum,” or zero point. A correction factor needs to be used when comparing the two. For more information, see DOB’s guide to rebuilding after Sandy.

  10. Q: What is freeboard?

  11. A:  “Freeboard” is the practice of elevating a building’s lowest floor above predicted flood elevations by a small additional height, typically one to three feet above FEMA minimum height requirements, depending on building type(two feet for single and two- family residences and one foot for most other buildings). The benefits of freeboard include an additional margin of safety to protect against more severe storms and increased future flood risks from rising sea levels. Additionally, FEMA recognizes that freeboard significantly reduces flood risk and provides substantial reductions in flood insurance premiums for structures that incorporate freeboard.

  12. Q: What is the Flood Resistant Construction Elevation (FRCE)? A: The FRCE is a new zoning datum that will be used as the basis for zoning calculations in flood zones. The FRCE is determined by using  the elevation shown on the latest FEMA Flood maps and adding the additional freeboard elevation that is required by the Building Code for your building type.

    Example: A single family home is located in an A zone with an elevation of 12 on the latest FEMA flood map. The  height of grade is 8 feet above sea level, which means the difference between the height of grade and the FEMA flood elevation is 4 feet. By adding the additional 2 feet of freeboard required for a single-family home, the Flood Resistant Construction Elevation (FRCE) is determined to be 14 feet, which is 6 feet above grade.

  13. Q: What makes this text amendment different from the Mayor’s Executive Order?

    A: This text amendment codifies the zoning relief that was offered by the Mayor’s Executive Order, as well provides additional areas of relief that the Executive order did not. Additionally, the Executive Order must be renewed every five (5) days which provides some uncertainty for those trying to rebuild. This text amendment provides more permanent regulations to allow property owners to rebuild with confidence, based on the best available flood risk information from FEMA.

  14. Q: When is this text amendment anticipated to become effective? What can I do until then?

    A: This text amendment has been referred out to all affected Community Boards, Borough Boards and Borough Presidents for comments and must be voted on by the Planning Commission and City Council in order to take effect. This process will take several months, but is expected to conclude in the Fall of 2013. Until then, the Mayor’s Executive Order will remain in place to offer zoning relief for those seeking to rebuild.

  15. Q: What is City Planning doing to address recovery and resilience in waterfront communities – those affected and those not affected by Hurricane Sandy? 


  16. A: In addition to this city-wide text amendment to allow property owners to build to a higher, safer standard of construction, The Department of City Planning has issued two reports detailing strategies on how the city can better adapt to increased flood risk. “Designing for Flood Risk” identifies key design principles to guide flood-resistant construction in urban areas and explores the impacts of flood-resistant construction standards on built form and the creation of a vibrant streetscape. The second study, “Urban Adaptive Waterfront Strategies” is a resource to help guide planners and policy makers in New York City and other urban areas in identifying and evaluating potential coastal protection strategies, from bulkheads to artificial reefs. These efforts will be supplemented in the coming months by local, neighborhood-scale planning to address unique issues in the  communities most affected by Hurricane Sandy and potential future flooding.

  17. Q: What if I need certain types of relief that are not provided for in this amendment?

    A: While this amendment attempts to provide a large amount of flexibility to enable rebuilding, there may be special circumstances that arise that are not covered. To provide additional flexibility, a new special permit has been proposed by this amendment to allow certain zoning modifications within flood zones to enable rebuilding. Also, this is just the first of several efforts underway by the Department of City Planning. Over the next several months, additional neighborhood planning and study of buildings within the flood zones will be conducted to determine additional steps that will be necessary.

  18. Q: This text amendment only deals with individual building strategies; what is New York City doing as a whole to retrofit it’s shoreline to better withstand future storms?

    A: On June 11, Mayor Michael Bloomberg announced “A Stronger, More Resilient New York”, a comprehensive plan that contains actionable recommendations both for rebuilding the communities impacted by Sandy and increasing the resilience of infrastructure and buildings citywide. A copy of the report can be found on the Special Initiative for Rebuilding and Resiliency’s website.

  19. Q: Where can I go to find out more information regarding flood insurance, new regulations and other recovery efforts?

    A: The following links provide additional information:

    NYC Recovery – The City of New York’s main portal for information regarding rebuilding
    NYC Housing Recovery – resources for individuals affected by Hurricane Sandy
    FEMA Region 2 Website – Find information about flood risk for your property
    DOB Information on Rebuilding After Sandy – guide to rebuilding, information on flood-resistant construction standards, and more
    DCP Climate Resilience Initiatives – information on coastal and flood zone initiatives
    FloodSmart.gov – The official website of the National Flood Insurance Program (NFIP)


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