Appendix G Flood-Resistant Construction

The purpose of this appendix is to promote the public health, safety and general welfare and to minimize public and private losses due to flood conditions in specific flood hazard areas through the establishment of comprehensive regulations for management of flood hazard areas designed to:

1. Prevent unnecessary disruption of commerce, access and public service during times of flooding;
2. Manage the alteration of natural floodplains, stream channels and shorelines;
3. Manage filling, grading, dredging and other development that may increase flood damage or erosion potential;
4. Prevent or regulate the construction of flood barriers that will divert floodwaters or that can increase flood hazards;
5. Contribute to improved construction techniques in the floodplains; and
6. Comply with and exceed the minimum standards of the National Flood Insurance Program as administered by the Federal Emergency Management Agency (FEMA).

The objectives of this appendix are to:

1. Protect human life;
2. Minimize the expenditure of public money for flood control projects;
3. Minimize the need for rescue and relief efforts associated with flooding;
4. Minimize prolonged business interruption;
5. Minimize damage to structures located in flood hazard areas;
6. Minimize damage to public facilities and utilities such as water, electricity, telephone and sewer lines, and streets and bridges located in flood hazard areas;
7. Help maintain a stable tax base by providing for the sound use and development of flood prone areas; and
8. Ensure that potential owners and occupants are notified that property is within flood hazard areas.

Where this code makes reference to the nationally recognized standard ASCE 24, such standard shall be as modified for New York City in accordance with Section G501 of this appendix.

This appendix, in conjunction with the New York City Construction Codes, provides minimum requirements for development located, in whole or in part, in special flood hazard areas and shaded X-Zones within the jurisdiction of New York City, including:

1. Subdivisions. This appendix shall apply to the subdivision of land;
2. Utilities. This appendix shall apply to the installation of utilities;
3. Group U buildings and structures. This appendix shall apply to placement and replacement of Group U buildings as defined in Section 312;
4. Site improvements. This appendix shall apply to site improvements, including but not limited to, temporary or permanent storage of materials, mining, dredging, filling, grading, paving, excavations, operations and other land disturbing activities;
5. Prefabricated buildings and manufactured homes. This appendix shall apply to placement and replacement of prefabricated buildings and manufactured homes;
6. Post-FIRM construction. This appendix shall apply to post-FIRM construction;
7. Alterations to post-FIRM construction. This appendix shall apply to repair, alteration, reconstruction, rehabilitation or additions to post-FIRM construction;
8. Substantial improvement of pre-FIRM construction. This appendix shall apply to substantial improvement of pre-FIRM buildings and structures, including restoration after damage, as if hereafter erected;
9. Horizontal enlargements of pre-FIRM construction. This appendix shall apply to horizontal enlargements of pre-FIRM buildings and structures to the extent of such horizontal enlargement, including but not limited to additions (whether above or below grade), decks, carports, or similar appendages. The existing portions of the structure shall not be required to comply, unless otherwise required because the alteration is deemed a substantial improvement; and
10. Other alterations to pre-FIRM construction. This appendix shall apply to repair, alteration, reconstruction, rehabilitation, or additions to pre-FIRM buildings and structures. No increase in the degree of noncompliance with this appendix shall be permitted. The requirements of this Item 10 shall be deemed satisfied if the work would not increase the degree of noncompliance with this appendix.
    1. Work that increases the degree of noncompliance. Work to pre-FIRM construction deemed as an increase in the degree of noncompliance includes, but is not limited to:
       1. The conversion of any space below the design flood elevation from nonhabitable space into habitable space;
       2. The creation of a direct communication between a dwelling unit and a space below the design flood elevation;
       3. Where a dwelling unit already has space below the design flood elevation or has space with which the dwelling unit directly communicates that is below the design flood elevation, an increase in such space;
       4. The conversion of any space below the design flood elevation in a nonresidential building (for flood zone purposes) to accessory (as such term is defined in NYC ZR) to a group R-1, R-2, or R-3 occupancy, when such space was not previously accessory to such occupancy;
       5. The installation of new components, materials, finishes, plumbing fixtures and equipment below the design flood elevation that are not permitted by this appendix to be located below the design flood elevation, where such similar items did not previously exist, except for new components, materials, finishes, and equipment as permitted by Item 10.2.2;
       6. The lowering of the elevation of a floor of a basement (for floodzone purposes), or a portion thereof located below the design flood elevation, except as permitted by Item 10.2.4;
       7. An alteration consisting of a change in use, occupancy or how such space is used in a building, or portion thereof, that results in a more restrictive flood design class per ASCE 24; and
       8. Any condition not addressed in Items 10.1.1 through 10.1.7 as determined by the commissioner.
    2. Work that does not increase the degree of noncompliance. The following work to pre-FIRM construction, other than substantial improvements, shall not be deemed as an increase in the degree of noncompliance:
       1. Plumbing fixtures:
          1. The in-kind replacement of plumbing fixtures below the design flood elevation; and
          2. The installation of new plumbing fixtures in a space within the structure where similar plumbing fixtures already exist, provided that the number of plumbing fixtures is not increased and provided any required backflow prevention and/or sewage ejection is provided in accordance with this appendix.
       2. Components, materials, finishes, equipment, fire protection systems and equipment, and appliances, other than plumbing fixtures:
          1. The in-kind replacement of components, materials, finishes, equipment, fire protection systems and equipment, and appliances;
          2. The installation of new components, materials, finishes, equipment, fire protection systems and equipment, and appliances, in a space within the structure where similar pre-FIRM items already exist; and
          3. Within existing nonresidential portions of a nonresidential (for flood zone purposes) building, the installation of new components, materials, finishes, equipment, fire protection systems and equipment, and appliances which serve only the space(s) being altered below the design flood elevation, provided such items, as well as any associated electrical wiring, are designed and/or isolated so as not to affect the operation of building components, systems and wiring of other parts of the building if submerged. This item shall not include increases to the number of plumbing fixtures or the installation of building systems which support other areas of the building.
       3. Change in use, occupancy or how such space is used. Alteration consisting of a change in use, occupancy or how such space is used in a nonresidential building (for flood zone purposes), or portion thereof, that does not result in a more restrictive flood design class per ASCE 24, is not a conversion from nonhabitable space into habitable space, and is not otherwise required by Item 10.1.4 to comply with this appendix. Such alteration shall also comply with the provisions of Item 10.2.2; and
       4. Pits. The lowering of the elevation of a floor or a portion thereof located below the design flood elevation for pits to accommodate sump pumps, house traps, valve access, cleanouts, ejector pumps and elevators.
11. Retroactive requirements. This appendix shall apply to retroactive requirements as provided for in Section G312.

The following flood hazard map and supporting data are adopted as referenced standards and declared to be a part of this appendix.

1. FEMA FIS 360497.
2. FEMA FIRMs 360497.

Map changes to FEMA FIRMs 360497 shall be administered in compliance with Sections G102.3.1 through G102.3.3.

The commissioner is hereby designated as the floodplain administrator for the City of New York and shall review permit applications to determine that:

1. Proposed development sites will be reasonably safe from flooding;
2. All site development activities, including grading, filling, utility installation and drainage modification, and all new construction and substantial improvements (including the placement of prefabricated buildings and manufactured homes) are designed and constructed with methods, practices and materials that minimize flood damage and that are in accordance with this code and ASCE 24; and
3. All other required state and federal permits have been obtained.

Flood elevations shall be determined in accordance with Sections G103.3.1 through G103.3.2.

Prior to issuing a permit for any floodway encroachment, including fill, new construction, substantial improvements and other development or landdisturbing activity, the commissioner shall require submission of a certification, prepared by a registered design professional, along with supporting technical data, demonstrating that such development will not cause any increase of the level of the base flood.

Prior to issuing a permit for any alteration or relocation of any watercourse within a special flood hazard area, the commissioner shall require the applicant to:

1. Notify any affected adjacent municipalities or government jurisdictions;
2. Notify the DEC;
3. Submit evidence of such notifications to the commissioner and the Regional Director, Region II, the Federal Emergency Management Agency (FEMA);
4. Submit to the commissioner evidence of all such notifications;
5. Submit an engineering analysis demonstrating that the flood-carrying capacity of the altered or relocated portion of the watercourse will not be decreased; and
6. Submit evidence that such watercourses will be maintained in a manner which preserves the channel's flood-carrying capacity.

Prior to issuing a permit for any alteration of sand dunes in coastal high-hazard areas and coastal A-zones, the commissioner shall require submission of an engineering analysis, prepared by a registered design professional, demonstrating that the proposed alteration will not increase the potential for flood damage.

The commissioner shall maintain records of the following:

1. Applications and supporting documents for development in flood hazard areas;
2. Permits issued in flood hazard areas;
3. Inspection reports;
4. Certifications required in this appendix; and
5. Certificate of occupancy where applicable.

See Chapter 2 of Title 28 of the Administrative Code.

Any person, owner or owner's authorized agent who intends to conduct any development, as applicable pursuant to Section G102.1, within a flood hazard area, shall first make application to the commissioner and shall obtain the required permit in accordance with Section 28-105.1 of the Administrative Code, notwithstanding any exemption pursuant to Section 28-105.4 of the Administrative Code.

The applicant shall file an application in writing on a form furnished by the commissioner. The commissioner shall not approve such application unless the applicant submits all plans, details, data and documents demonstrating that the development complies with Sections G104.2.1 through G104.2.3 and all other provisions of this appendix.

The issuance of a permit under this appendix shall not be construed to be a permit for, or approval of, any violation of this appendix or any other provision of this code. The issuance of a permit based on submitted documents and information shall not prevent the commissioner from requiring the correction of errors. The commissioner is authorized to prevent occupancy or use of a structure or site that is in violation of this appendix or other provisions of this code.

A permit shall become invalid if the proposed development is not commenced within 180 days after its issuance, or if the work authorized is suspended or abandoned for a period of 180 days after the work commences.

The commissioner is authorized to suspend or revoke a permit issued under this appendix wherever the permit is issued in error or on the basis of incorrect, inaccurate or incomplete information, or in violation of this code, in accordance with Section 28-105 of the Administrative Code.

Permit reinstatements for a permit that has expired pursuant to Section G104.4 shall be requested in writing. The commissioner is authorized to grant such reinstatement, provided that the work shall comply with all of the requirements of this appendix, including any revised FEMA FIRMs 360497 in effect at the time the application for reinstatement is made, and provided further that the applicant shall pay all reinstatement fees as required in Article 112 of Title 28 of the Administrative Code.

The Board of Standards and Appeals shall hear and decide requests for variances from the requirements of this appendix. The Board of Standards and Appeals shall base its determination on technical justifications, and has the right to attach such conditions to variances as it deems necessary to further the purposes and objectives of this appendix.

The Board of Standards and Appeals shall:

1. Maintain a record of all variance actions, including justification for their issuance; and
2. Report such variances issued in its biennial report submitted to the Federal Emergency Management Agency (FEMA).

A variance is authorized to be issued by the Board of Standards and Appeals for the repair or rehabilitation of a historic structure upon a determination that the proposed repair or rehabilitation will not preclude the structure's continued designation as a historic structure, and the variance is the minimum necessary to preserve the historic character and design of the structure.

The Board of Standards and Appeals is authorized to issue a variance for the construction or substantial improvement of a functionally dependent facility provided the criteria in Sections G105.3, G105.5 and G105.7 are met and the variance is the minimum necessary to allow the construction or substantial improvement, and that all due consideration has been given to methods and materials that minimize flood damages during the base flood and create no additional threats to public safety.

The Board of Standards and Appeals shall not issue a variance for any proposed development in a floodway if any increase in flood levels would result during the base flood discharge.

In reviewing applications for variances, the Board of Standards and Appeals shall consider all technical evaluations, all relevant factors, all other portions of this appendix and the following:

1. The danger that materials and debris may be swept onto other lands resulting in further injury or damage.
2. The danger to life and property due to flooding or erosion damage.
3. The susceptibility of the proposed development, including contents, to flood damage and the effect of such damage on current and future owners.
4. The importance of the services provided by the proposed development to the community.
5. The availability of alternate locations for the proposed development that are not subject to flooding or erosion.
6. The compatibility of the proposed development with existing and anticipated development.
7. The relationship of the proposed development to the comprehensive plan and floodplain management program for that area.
8. The safety of access to the property in times of flood for ordinary and emergency vehicles.
9. The expected heights, velocity, duration, rate of rise and debris and sediment transport of the floodwaters and the effects of wave action, if applicable, expected at the site.
10. The costs of providing governmental services during and after flood conditions including maintenance and repair of public utilities and facilities such as sewer, gas, electrical and water systems, streets and bridges.

Except for historic structures as provided for in Section G105.3, the Board of Standards and Appeals is authorized to issue a variance where all of the following criteria are met:

1. A technical showing of good and sufficient cause that the characteristics of the size, configuration or topography of the site renders the standards inappropriate;
2. A determination that failure to grant the variance would result in exceptional hardship to the applicant for the variance;
3. A determination that the granting of a variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, nor create nuisances, cause fraud on or victimization of the public or conflict with existing local laws or ordinances;
4. A determination that the variance is the minimum necessary, considering the flood hazard, to afford relief;
5. Notification to the applicant in writing over the signature of the Executive Director of the Board of Standards and Appeals that the issuance of a variance to construct a structure below the base flood level will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage, and that such construction below the base flood level increases risks to life and property; and
6. A determination that the new construction, substantial improvement, or other proposed development is located on a tax lot that, on November 16, 1983, was no more than 1/2 acre (0.2 hectare) in size. However, where the tax lot has been determined to be larger than 1/2 acre (0.2 hectare), the technical justification required for issuing the variance increases with the lot size.

This section shall apply to post-FIRM construction and substantial improvements where the work results in the issuance of a new or amended certificate of occupancy.

The certificate of occupancy shall describe all enclosed areas below the design flood elevation that are subject to flooding and that meet the requirements of this appendix for wet floodproofing as "wet floodproofed, subject to flooding". The certificate of occupancy shall indicate the use of wet floodproofed spaces as either parking, storage, building access or crawl spaces. The certificate of occupancy shall be issued with the following restriction: "Levels subject to flooding shall not be used for any other use except as stated on this certificate."

The certificate of occupancy shall describe all enclosed areas below the design flood elevation that are not dry floodproofed as "subject to flooding". The certificate of occupancy shall indicate the use of spaces enclosed by open lattice breakaway walls below the design flood elevation as either unconditioned parking, unconditioned storage, or unconditioned building access. The certificate of occupancy shall be issued with the following restriction: "Levels subject to flooding shall not be used for any other use except as stated on this certificate."

The certificate of occupancy shall describe any dry floodproofed spaces as "dry floodproofed." Where flood shields or other flood control devices are installed, the certificate of occupancy shall also provide notations describing these features. For evacuated buildings or evacuated portions of buildings utilizing the temporary stair or ramp provisions of Section G308.10.1, the certificate of occupancy shall note "In portions of this building planned to be evacuated during flood conditions, occupancy shall be prohibited except for maintenance or emergency personnel."

Where applicable, the certificate of occupancy shall indicate that "the structure is exempted from the special flood hazard area pursuant to FEMA Letter of Map Amendment (LOMA) # (_______)," or that "the structure is exempted from the special flood hazard area pursuant to FEMA Letter of Map Revision Based on Fill (LOMR-F) # (_______)," or that "the structure is exempted from the special flood hazard area pursuant to FEMA Letter of Map Revision (LOMR) # (_______)."

Periodic, progress and special inspections shall be performed in accordance with this section. All work applications, regardless of the scope of work, shall be subject to the progress and special inspection requirements of Sections G107.2 through G107.4.

All work applications other than new buildings, horizontal enlargements and substantial improvements, shall be subject to the following special inspection:

1. Flood zone compliance special inspection. Prior to sign-off of work, a special inspector or special inspection agency shall inspect during the course of construction and certify that: "the structure was constructed" or "alterations were performed," "with methods and practices that minimize flood damage and that are in accordance with approved plans, and with any applicable provisions of Appendix G of the New York City Building Code and ASCE 24."

All applications for new buildings, horizontal enlargements or substantial improvements shall be subject to the following inspections:

1. Elevation progress inspection. Upon placement of the lowest floor, including the basement (for flood zone purposes), an engineer or licensed professional surveyor shall inspect the site and verify the elevation of such lowest floor. The inspection report verifying the elevation shall be submitted to the department prior to further vertical construction. The commissioner shall be permitted to issue a stop work order if such inspection report is not submitted.
2. Flood zone compliance special inspection. Prior to sign-off of work, a special inspector or special inspection agency shall inspect during the course of construction and certify that: "the structure was constructed" or "alterations were performed," "with methods and practices that minimize flood damage and that are in accordance with approved plans, and with any applicable provisions of Appendix G of the New York City Building Code and ASCE 24."
3. Final elevation required items. Prior to the sign-off of the flood zone compliance special inspection, the special inspector or special inspection agency shall verify that the following required items have been submitted to the department, as applicable:
   1. Elevation certificate. The elevation certificate shall be made utilizing FEMA Form 086-0-33 titled, "Elevation Certificate," and shall be signed by a registered design professional or surveyor.
   2. Dry floodproofing certificate. The dry floodproofing certificate shall be made utilizing FEMA Form 086-0-34 titled, "Floodproofing Certificate," and shall be signed by a registered design professional.

Where flood shields or other flood control devices are installed as part of a dry floodproofing system in buildings and structures that are nonresidential (for flood zone purposes), the special inspector or special inspection agency responsible for the flood zone compliance special inspection shall inspect the shields or devices in their stored positions or locations, witness their activation or transportation to their installed positions, and witness their deactivation or transportation back to their stored locations. The special inspector or special inspection agency shall also confirm the installation of signage required by ASCE 24, Section 6.2.3, Item 3.

Covered buildings, as described in Section 28-324 of the Administrative Code, shall be subject to periodic inspections for dry floodproofing systems in accordance with Sections G107.5.1 and G107.5.2.

This section contains terms defined elsewhere in this code, and terms with definitions that are specific to this appendix.

To the extent required by Section G102.1, all developments, including but not limited to utility installation, site improvements, placement of prefabricated buildings and manufactured homes, new building construction, alterations and repairs, shall be designed and constructed to resist the effects of flood hazards and flood loads in accordance with this appendix and ASCE 24.

Any construction subject to the requirements of Section G102.1 shall be designed and constructed to resist the loads and load combinations specified in Chapter 16.

Any subdivision proposal, including proposals for manufactured home parks and subdivisions, or other proposed new development within a special flood hazard area shall be reviewed to verify all of the following:

1. All such proposals are consistent with the need to minimize flood damage.
2. All public utilities and facilities, such as sewer, gas, electric and water systems, are located and constructed to minimize or eliminate flood damage.
3. Adequate drainage is provided to reduce exposure to flood hazards.

The following requirements shall apply in the case of any proposed subdivision, including proposals for manufactured home parks and subdivisions, any portion of which lies within a special flood hazard area:

1. The special flood hazard area, including floodways, coastal highhazard areas and coastal A-Zones, as appropriate, shall be delineated on tentative and final subdivision plats.
2. Base flood elevations shall be shown on tentative and final subdivision plats.
3. Building lots shall be provided with adequate buildable area, in accordance with the New York City Zoning Resolution, outside the floodway.
4. The design criteria for utilities and facilities set forth in this appendix and appropriate New York City Construction Codes shall be met.

Development or land-disturbing activity shall not be authorized in the floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice, and prepared by a registered design professional, that the proposed encroachment will not result in any increase in the base flood level, in accordance with Section G103.5.

In coastal high-hazard areas and coastal A-Zones:

1. New buildings, not including substantial improvements, shall only be authorized landward of the reach of mean high tide.
2. The use of fill for structural support of buildings is prohibited.

All new or replaced sanitary sewer facilities, private sewage treatment plants (including all pumping stations and collector systems) and on-site waste disposal systems shall be designed in accordance with Chapter 7, ASCE 24, to minimize or eliminate infiltration of floodwaters into the facilities and discharge from the facilities into floodwaters, or impairment of the facilities and systems.

All new or replacement water facilities shall be designed in accordance with the provisions of Chapter 7, ASCE 24, to minimize or eliminate infiltration of floodwaters into the systems.

Storm drainage shall be designed to convey the flow of surface waters to minimize or eliminate damage to persons or property and shall meet the requirements of ASCE 24.

Streets and sidewalks shall be designed to minimize potential for increasing or aggravating flood levels and shall meet the requirements of Section G303.8.

Retaining walls shall be designed in accordance with Section 1807. Retaining walls and driveways shall meet the requirements of Section G303.8.

In flood hazard areas, grading and/or fill shall not be approved:

1. Unless such fill is placed, compacted and sloped to minimize shifting, slumping and erosion during the rise and fall of flood water and, as applicable, wave action, in accordance with ASCE 24 and Section 1804 of this code.
2. In floodways, unless it has been demonstrated through hydrologic and hydraulic analyses performed by an engineer in accordance with standard engineering practice that the proposed grading or fill, or both will not result in any increase in the flood levels during the occurrence of the design flood, in accordance with Section G103.5.
3. In coastal A-Zones and coastal high-hazard areas, unless such fill is conducted and or placed to avoid diversion of water and waves towards any building or structure.

In addition to the requirements of ASCE 24, the following standards shall apply to post-FIRM construction, horizontal enlargements and substantial improvements located within A-Zones, other than Coastal A-Zones.

In addition to the requirements of ASCE 24, the following standards shall apply to post-FIRM construction, horizontal enlargements and substantial improvements located within coastal high-hazard area.

1. Foundation. The lowest floor shall be elevated on adequately anchored pilings or columns and securely anchored to such piles or columns to prevent flotation, collapse and lateral movement resulting from wind and flood loads acting simultaneously on all building components, and other load requirements of Chapter 16 and this appendix.
2. Lowest horizontal member. The lowest portion of the lowest horizontal structural member of the lowest floor (excluding the pilings or columns) shall be at or above the design flood elevation specified in ASCE 24, Table 4-1.
3. Below the lowest horizontal member. Spaces below the lowest horizontal member shall be either:
   1. Free of obstructions; or
   2. Enclosed with breakaway walls providing unconditioned space useable solely for parking of vehicles, building access, storage or crawl space. Such breakaway walls shall:
      1. Be of an open lattice type construction only;
      2. Meet the load requirements of Section 5.3.3 of ASCE 7; and
      3. Meet the additional requirements of ASCE 24.
4. Materials. Only flood-damage-resistant materials and finishes shall be utilized below the design flood elevation specified in ASCE 24, Table 5-1;
5. Utilities and equipment. Utilities and attendant equipment shall be located at or above the design flood elevation specified in ASCE 24, Table 7-1, or shall be constructed so as to both resist the wave action and prevent water from entering or accumulating within the components during conditions of flooding in accordance with ASCE 24;
   1. Additional requirements. The structure shall comply with Items 5.1 through 5.4 of Section G304.1.1.
6. Prohibitions. The following shall be prohibited in coastal high-hazard areas:
   1. Development, including land-disturbing activities, seaward of the reach of mean high tide;
   2. Use of fill for structural support of buildings; and
   3. Man-made alterations of sand dunes that would increase potential damage to buildings.
7. Certifications. Applications shall contain applicable certifications in accordance with Section G104.2.3; and
8. Special inspections. Special inspections shall be as required by Section G107.

In addition to the requirements of ASCE 24, all post-FIRM new buildings, horizontal enlargements and substantial improvements in a Coastal A-Zone shall comply with the coastal high-hazard area construction standards of Section G304.2.

In shaded X-Zones, flood design class 4 buildings, as defined in ASCE 24, Table 1-1, shall comply with the requirements of this appendix and the applicable provisions of ASCE 24 for A-Zone construction.

In addition to the other requirements of this appendix, connections for temporary external generators, boilers and chillers shall be provided in accordance with Sections G304.5.1 through G304.5.4.

All new and replacement manufactured homes shall be prohibited in coastal high-hazard areas. Within A-Zones, all new, replaced or substantially improved manufactured homes shall be elevated such that the lowest floor of the manufactured home is elevated to or above the design flood elevation as specified in ASCE 24, Table 2-1.

Within A-Zones, all new and replacement manufactured homes, including substantial improvement of existing manufactured homes, shall be placed on a permanent, reinforced foundation that is designed in accordance with ASCE 24.

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.

Mechanical equipment and outside appliances shall be elevated to or above the design flood elevation.

Fully enclosed areas below elevated manufactured homes shall comply with the requirements of Section G304.1.1, Item 2.

The placement of recreational vehicles shall not be authorized in coastal highhazard areas or in floodways.

Recreational vehicles in A-Zones shall be fully licensed and ready for highway use, and shall be placed on a site for less than 180 consecutive days.

Recreational vehicles in A-Zones that are not fully licensed and ready for highway use, or that are to be placed on a site for 180 or more consecutive days, shall meet the requirements of Section G305 for manufactured homes.

Underground tanks in special flood hazard areas shall be designed, constructed, installed, and anchored to prevent flotation, collapse and lateral movement resulting from hydrostatic loads, including the effects of buoyancy, during conditions of flooding to the design flood elevation, in accordance with ASCE 24.

Above-ground tanks in special flood hazard areas shall be:

1. Elevated to or above the design flood elevation specified in ASCE 24, Table 7-1; or
2. Designed, constructed, installed, and anchored to prevent flotation, collapse and lateral movement resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy, during conditions of flooding to the design flood elevation, in accordance with ASCE 24.

In special flood hazard areas, tank inlets, fill openings, outlets and vents shall be:

1. Installed at or above the design flood elevation specified in ASCE 24, Table 7-1, or designed to prevent the inflow of floodwater and outflow of the contents of the tanks during conditions of flooding to the design flood elevation, in accordance with ASCE 24; and
2. Anchored to prevent lateral movement resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy, during conditions of flooding to the design flood elevation, in accordance with ASCE 24.

Fuel-oil storage capacity in special flood hazard areas and shaded X-Zones shall comply with the following:

1. In special flood hazard areas, fuel oil on the lowest story having its floor above the applicable design flood elevation shall be limited to 3,000 gallons (11 356 L) and no storage tank may exceed the lesser of 1,500 gallons (5678 L) or the quantity of fuel-oil needed to operate the emergency or standby generator(s) served by such tank for 24 hours; and
2. In shaded X-Zones, fuel oil on the lowest story having its floor above the 500-year flood elevation shall be limited to 3,000 gallons (11 356 L) and no storage tank may exceed the lesser of 1,500 gallons (5678 L) or the quantity of fuel-oil needed to operate the emergency or standby generator(s) served by such tank for 24 hours.

The following tanks and containers shall be located at or above the design flood elevation specified in ASCE 24, Table 7-1, when serving flood design class 4 buildings. Such tanks and containers must be designed to maintain service to such structure during flood conditions and shall comply with Section 9.7 of ASCE 24:

1. Medical and compressed gas storage tanks, oxygen tanks, and other cryogenic system storage tanks;
2. Hazardous material storage tanks;
3. Stationary compressed gas containers;
4. Stationary cryogenic containers; and
5. Stationary flammable gas storage containers.

Garages and accessory structures shall be designed and constructed in accordance with ASCE 24, Section 9.4.

Fences in floodways that may block the passage of floodwaters, such as stockade fences and wire mesh fences, shall meet the requirement of Section G103.5.

Oil derricks located in special flood hazard areas shall be designed in conformance with ASCE 24.

Retaining walls, sidewalks and driveways shall meet the requirements of Sections G303.6 and G303.7.

Swimming pools shall be designed and constructed in accordance with ASCE 24. Above-ground swimming pools, on-ground swimming pools and in-ground swimming pools that involve placement of fill in floodways shall also meet the requirements of Section G103.5.

Decks, porches and patios shall be designed and constructed in accordance with ASCE 24.

In coastal high-hazard areas and coastal A-Zones, nonstructural concrete slabs used as parking pads, enclosure floors, landings, decks, walkways, patios and similar nonstructural uses are permitted beneath or adjacent to buildings and structures provided that the concrete slabs shall be constructed in accordance with ASCE 24, Section 9.3.

Roads and watercourse crossings that encroach into regulated floodways, including roads, bridges, culverts, low-water crossings and similar means for vehicles or pedestrians to travel from one side of a watercourse to the other, shall meet the requirement of Section G103.5.

Temporary flood shields shall be permitted in accordance with Section 6.2.3 of ASCE 24. Temporary flood shields shall be located and arranged so as to allow hose lines to be attached to the inlets of fire department connections without interference in accordance with Section 6.4.5 of NFPA 14 as modified by Appendix Q. Where temporary flood shields extend beyond the property line, Section 3202 for permitted encroachments into the public right-of-way shall apply.

Temporary stairs and ramps shall comply with the requirements of Sections G308.10.1 and G308.10.2. Temporary stairs and ramps shall be located and arranged so as to allow hose lines to be attached to the inlets of fire department connections without interference in accordance with Section 6.4.5 of NFPA 14, as modified by Appendix Q. Where temporary stairs and ramps extend beyond the property line, Section 3202 for permitted encroachments into the public right-of-way shall apply.

Where alterations to pre-FIRM buildings within the flood hazard area, other than substantial improvements or horizontal enlargements, include the installation of flood protective works, compliance with ASCE 24, Section 6.2.2 shall be required. Flood protective worksshall be located and arranged so as to allow hose lines to be attached to the inlets of fire department connections without interference in accordance with Section 6.4.5 of NFPA 14, as modified by Appendix Q of this code.

Temporary structures shall be erected for a period of less than 180 days. Temporary structures shall be anchored to prevent flotation, collapse or lateral movement resulting from hydrostatic loads, including the effects of buoyancy, during conditions of the base flood. Fully enclosed temporary structures shall have flood openings that are in accordance with ASCE 24 to allow for the automatic entry and exit of floodwaters.

Temporary storage includes storage of goods and materials for a period of fewer than 180 days. Stored materials shall not include hazardous materials.

Temporary structures and temporary storage in floodways shall meet the requirements of Section G103.5.

Section G310 shall govern utility and miscellaneous Group U, including buildings that are accessory in character and miscellaneous structures not classified in any specific occupancy in this code, including, but not limited to, agricultural buildings, aircraft hangars (accessory to a one- or two-family residence), barns, carports, fences more than 6 feet (1829 mm) high, grain silos (accessory to a residential occupancy), greenhouses, livestock shelters, private garages, retaining walls, sheds, stables and towers.

Utility and miscellaneous Group U buildings and structures, including substantial improvement of such buildings and structures, shall be anchored to prevent flotation, collapse or lateral movement resulting from flood loads, including the effects of buoyancy, during conditions of the design flood.

Utility and miscellaneous Group U buildings and structures, including substantial improvement of such buildings and structures, shall be elevated such that the lowest floor, including basement, is elevated to or above the design flood elevation specified in ASCE 24, unless otherwise permitted to comply with requirements of Section 9.4 of ASCE 24.

Fully enclosed areas below the design flood elevation shall be constructed in accordance with Section G304.

Flood-damage-resistant materials shall be used below the design flood elevation.

Mechanical, plumbing and electrical systems, including plumbing fixtures, shall be elevated to or above the design flood elevation.

Portable containers located in the flood hazard area that store hazardous substances, as defined in Section 41-03 of Title 15 of the Rules of the City of New York, shall comply with Section 41-14 of Title 15 of the Rules of the City of New York.

Notwithstanding any other provision of the New York City Construction Codes, the provisions of this section shall apply retroactively to all buildings and structures specified herein.

The following buildings shall be provided with connections for temporary external generators in accordance with Sections G304.5.1 through G304.5.4, as applicable, by January 1, 2033, and a report detailing compliance with such requirements shall be filed with the department in accordance with Section G312.2.2 by such date:

1. Buildings whose main use or dominant occupancy is Group I-1 and that are located in a special flood hazard area;
2. Buildings whose main use or dominant occupancy is an adult home, enriched housing, community residence or intermediate care facility that is classified as occupancy Group R pursuant to an exception to Section 308.3.1 or 308.3.2 and that are located in a special flood hazard area;
3. Buildings whose main use or dominant occupancy is Group I-2 hospital and that are located in a special flood hazard area or shaded X-Zone;
4. Buildings whose main use or dominant occupancy is Group I-2 nursing home and that are located in a special flood hazard area; and
5. Buildings whose main use or dominant occupancy is Group I-2, other than hospitals and nursing homes, and that are located in a special flood hazard area.

Buildings whose main use or dominant occupancy is Group I-2 hospital and that are located in a flood hazard area shall be provided with connections for temporary external boilers and chillers in accordance with Section G304.5.2 by January 1, 2033, and a report detailing compliance with such requirements shall be filed with the department in accordance with Section G312.3.2 by such date.

This section lists the standards that are referenced in various sections of this appendix. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title and the section or sections of this document that reference the standard.

Refer to the rules of the department for any subsequent additions, modifications or deletions that may have been made to these standards in accordance with Section 28-103.19 of the Administrative Code.

The application of the referenced standards shall be as specified in Section G105.1.

The following amendments are hereby made to the applicable sections of ASCE 24-14. Refer to the rules of the department for any subsequent additions, modifications or deletions that may have been made to this standard in accordance with Section 28-103.19 of the Administrative Code.

Section 1.1. Section 1.1 (Scope) is amended by deleting the sentence "In addition to the requirements of this section (see Fig. 1-2):" and Items 1 through 4, and by adding the following paragraph to read as follows:

In addition to the requirements of this section, the applicability of this standard is as provided for in Section G102.1 of the New York City Building Code, Appendix G.

Section 1.1. Figure 1-2 (Application of Chapters) of Section 1.2. Delete. 

Section 1.1.1. A new Section  1.1.1 is added to read as follows:



Section 1.2. Section 1.2 (Definitions) is amended by modifying only the following definitions to read as follows:







Section 1.4.3. Table 1-1 of Section 1.4.3 (Classification of Structures) is amended to read as follows:

TABLE 1-1
FLOOD DESIGN CLASS OF BUILDINGS AND STRUCTURES

USE OF OCCUPANCY OF BUILDINGS AND STRUCTURES	FLOOD DESIGN CLASS
Buildings and structures that normally are unoccupied and pose minimal risk to the public or minimal disruption to the community should they be damaged or fail due to flooding. Flood Design Class 1 includes: certain temporary structures that are in place for less than 180 days, accessory storage buildings and minor storage facilities, small structures used for parking of vehicles, and certain agricultural structures. a	1
Buildings and structures that pose a moderate risk to the public or moderate disruption to the community should they be damaged or fail due to flooding, except those listed as Flood Design Classes 1, 3, and 4. Flood Design Class 2 includes the vast majority of buildings and structures that are not specifically assigned another Flood Design Class, including most residential, commercial, and industrial buildings.	2
Buildings and structures that pose a high risk to the public or significant disruption to the community should they be damaged, be unable to perform their intended functions after flooding, or fail due to flooding. Flood Design Class 3 includes: buildings and structures in which 300 or more persons may assemble in one place, such as theaters, lecture halls, and religious institutions with large areas used for worship; museums; community centers and other recreational facilities; athletic facilities with seating for spectators; elementary schools, secondary schools, and buildings with college or adult education classrooms; jails, correctional facilities, and detention facilities; healthcare facilities not having surgery or emergency treatment capabilities; care facilities where residents have limited mobility or ability, including nursing homes but not including care facilities for five or fewer persons; preschool and child care facilities not located in one- and two-family dwellings; buildings and structures associated with power generating stations, water and sewage treatment plants, telecommunication facilities, and other utilities which, if their operations were interrupted by a flood, would cause significant disruption in day-to-day life or significant economic losses in a community; and buildings and other structures not included in Flood Design Class 4 (including but not limited to facilities that manufacture, process, handle, store, use, or dispose of such substances as hazardous fuels, hazardous chemicals, hazardous waste, or explosives) containing toxic or explosive substances where the quantity of the material exceeds a threshold quantity established by the authority having jurisdiction and is sufficient to pose a threat to the public if released.b	3
Buildings and structures that contain essential facilities and services necessary for emergency response and recovery, or that pose a substantial risk to the community at large in the event of failure, disruption of function, or damage by flooding. Flood Design Class 4 includes: group I-2 occupancies having surgery or emergency treatment facilities; fire, rescue, ambulance, and police stations and emergency vehicle garages; designated emergency shelters; designated emergency preparedness, communication, and operation centers and other facilities required for emergency response; power generating stations and other public utility facilities required in emergencies; structures containing highly toxic materials as defined by Section 307 where the quantity of the material exceeds the maximum allowable quantities of Table 307.1(2); critical aviation facilities such as control towers, air traffic control centers, and hangars for aircraft used in emergency response; ancillary structures such as communication towers, electrical substations, fuel or water storage tanks, or other structures necessary to allow continued functioning of a Flood Design Class 4 facility during and after an emergency; buildings and other structures having critical national defense functions; and water storage facilities and pump structures required to maintain water pressure for fire suppression.	4

1. Certain agricultural structures may be exempt from some of the provisions of this standard; see Section C1.4.3.
2. Buildings and other structures containing toxic, highly toxic, or explosive substances shall be eligible for assignment to a lower Flood Design Class if it can be demonstrated to the satisfaction of the authority having jurisdiction by a hazard assessment as described in Section 1.5.3 of Minimum Design Loads for Buildings and Other Structures that a release of the substances is commensurate with the risk associated with that Flood Design Class.

Section 2.3. Table 2-1 of Section 2.3 (Elevation Requirements) is amended to read as follows:

TABLE 2-1
MINIMUM ELEVATION OF THE TOP OF LOWEST FLOOR FLOOD HAZARD AREAS OTHER THAN COASTAL HIGH-HAZARD AREAS^a, COASTAL A-ZONES^a

FLOOD DESIGN CLASSb	MINIMUM ELEVATION, RELATIVE TO BASE FLOOD ELEVATION (BFE) OR DESIGN FLOOD ELEVATION (DFE)
1c	DFE = BFE + 2 ft
2d	DFE = BFE + 2 ft
3d	DFE = BFE + 2 ft
4d	DFE = BFE + 2 ft, or 500- year flood elevation, whichever is higher

1. Minimum elevations shown in Table 2-1 do not apply to Coastal High-Hazard Areas and Coastal A-Zones (see Table 4-1). Minimum elevations shown in Table 2-1 apply to other high risk flood hazard areas unless specific elevation requirements are given in Section 3 of this standard.
2. See Table 1-1 for Flood Design Class descriptions.
3. Flood Design Class 1 structures shall be allowed below the minimum elevation where the structure is permitted to be wet floodproofed in accordance with the requirements of Section 6.3.1 and is wet floodproofed in accordance with Section 6.3.2.
4. For nonresidential buildings and nonresidential portions of mixed-use buildings, the lowest floor shall be allowed below the minimum elevation if the structure meets the floodproofing requirements of Section 6.2.

Section 4.4. Table 4-1 of Section 4.4 (Elevation Requirements) is amended to read as follows:

TABLE 4-1
MINIMUM ELEVATION OF BOTTOM OF LOWEST SUPPORTING
HORIZONTAL STRUCTURAL MEMBER OF LOWEST FLOOR-COASTAL HIGH-HAZARD
AREAS AND COASTAL A-ZONES

FLOOD DESIGN CLASSa	MINIMUM ELEVATION, RELATIVE TO BASE FLOOD ELEVATION (BFE) OR DESIGN FLOOD ELEVATION (DFE)
1	DFE = BFE + 2 ft
2	DFE = BFE + 2 ft
3	DFE = BFE + 2 ft
4	DFE = BFE+ 2 ft, or 500- year flood elevation, whichever is higher

1. See Table 1-1 Flood Design Class descriptions.

Section 4.6.1. Section 4.6.1 (Breakaway Walls) is amended by adding the following sentence:



Section 5.1. Table 5-1 of Section 5.1 (Materials, General) is amended to read as follows:

TABLE 5-1
MINIMUM ELEVATION BELOW WHICH FLOOD-DAMAGE-RESISTANT
MATERIALS SHALL BE USED

FLOOD DESIGN CLASSa	MINIMUM ELEVATION IN FLOOD HAZARD AREAS, OTHER THAN COASTAL HIGH-HAZARD AREAS AND COASTAL AZONES, RELATIVE TO DESIGN FLOOD ELEVATION (DFE)	MINIMUM ELEVATION IN COASTAL HIGHHAZARD AREAS AND COASTAL AZONES, RELATIVE TO DESIGN FLOOD ELEVATION (DFE)
1	DFE = BFE + 2 ft	DFE = BFE + 2 ft
2	DFE = BFE + 2 ft	DFE = BFE + 2 ft
3	DFE = BFE + 2 ft	DFE = BFE + 3 ft
4	DFE = BFE + 2 ft, or 500-year flood elevation, whichever is higher	DFE = BFE + 3 ft, or 500-year flood elevation, whichever is higher

1. See Table 1-1 for Flood Design Class descriptions.

Section 5.2.6. Section 5.2.6 (Finishes) shall be amended to read as follows:



Section 6.2. Table 6-1 of Section 6.2 (Dry Floodproofing) is amended to read as follows:

TABLE 6-1
MINIMUM ELEVATION OF FLOODPROOFING-FLOOD HAZARD AREAS OTHER THAN COASTAL
HIGH-HAZARD AREAS^a

FLOOD DESIGN CLASSb	MINIMUM ELEVATION OF FLOODPROOFINGc RELATIVE TO DESIGN FLOOD ELEVATION (DFE)
1	DFE = BFE + 2 ft
2d	DFE = BFE + 2 ft
3	DFE = BFE + 2 ft
4	DFE = BFE + 2 ft, or 500-year flood elevation, whichever is higher

1. Dry floodproofing is not allowed in Coastal High-Hazard Areas.
2. See Table 1-1 for Flood Design Class descriptions.
3. Wet or dry floodproofing shall extend to the same level.
4. Dry floodproofing shall not be permitted (i) in buildings that are "residential for flood zone purposes"; (ii) for certain systems and equipment as provided for in Section G304.1.2, Item 2.3.1 of the New York City Building Code; and (iii) for dwelling units and spaces directly accessed from dwelling units in buildings that are "nonresidential for flood zone purposes".

Section 6.2.1. (Dry Floodproofing Limitations) is amended to add the following exceptions: Section 6.2.2. Item 1 of Section 6.2.2 (Dry Floodproofing Requirements) is amended to read as follows:

1. Be designed and constructed so that any area below the applicable elevation specified in Table 6-1, together with attendant utilities, equipment, and sanitary facilities, is flood resistant with walls that are substantially impermeable to the passage of water. Where acceptable to the commissioner, fixed flood-resistant glazing systems may be used when tested and designed to be within walls substantially impermeable to water. Walls, floors, and flood shields shall be designed and constructed to resist hydrostatic, hydrodynamic, and other flood-related loads, including the effects of buoyancy resulting from flooding to the elevation listed in Table 6-1;

Section 6.2.2. Item 3 of Section 6.2.2 (Dry Floodproofing Requirements) is amended to read as follows:

1. 3. Provide egress and ingress, where a means of egress is required by Chapter 10 of the New York City Building Code, to such dry floodproofed areas of structures in accordance with Item 3.1, 3.2 or 3.3, or a combination thereof, where permitted, as follows:
   1. 3.1 Egress and ingress not blocked by shields. Means of egress shall be elevated to or above the applicable DFE specified in Table 6-1, capable of providing human ingress and egress during the design flood between the dry floodproofed area to the exterior, without being blocked by flood shields or flood control devices; or
   2. 3.2 Egress and ingress blocked by shields not serving dwelling units. Where a means of egress required by Chapter 10 of the New York City Building Code that does not serve a dwelling unit is to be blocked by flood shields or flood control devices, an alternate means of egress shall be provided capable of providing human ingress and egress during the design flood between the dry floodproofed area to the exterior. The alternate means of egress shall comprise of: (i) a door providing ingress and egress opening directly to the exterior at or above the DFE, and such door shall be permitted to be accessed by steps or ramps; or (ii) a means of egress leading to an exterior exit door not blocked by shields or which is constructed as a wet floodproofed enclosure where discharging below the DFE, and such means of egress shall be permitted to be accessed by stairs and ramps. In either case, such alternate means of egress shall also comply with Items 3.2.1 through 3.2.6:
      1. 3.2.1 Alternate Means of Egress Entrance. The alternate means of egress entrance door, or directional signage to such alternate means of egress entrance door shall be readily visible and identifiable within a direct line of sight to a person approaching the blocked egress door(s). The path of travel from the blocked egress door to the alternate means of egress entrance shall be unobstructed with a travel distance of not more than 40 ft as measured from the blocked means of egress. Directional signage to the alternate means of egress shall be installed on the exit door blocked by flood shields prior to flood condition and removed during non-flood conditions.
      2. 3.2.2 Travel Distance. The path of travel from the alternate means of egress entrance door leading to the exterior of the building shall not exceed 100 ft.
      3. 3.2.3 Temporary Stairs, Ramps and Platforms. For buildings or portions of buildings that are planned to be evacuated during the design flood condition and pre-FIRM buildings, temporary stairs and ramps shall be permitted to serve as an alternate means of egress if their only purpose is to provide supplemental egress and ingress during conditions of flooding subject to the limitations of Section G308.10 of the New York City Building Code.
         1. 3.2.3.1 Doors. Any door opening directly onto such temporary stairs or platforms shall be secured during non-flood conditions to prevent use when such temporary stairs and ramps are in storage.
         2. 3.2.3.2 Signage. Directional signage to an egress utilizing temporary stairs, ramps or platforms shall be removed to prevent accidental operation during non-flood conditions.
      4. 3.2.4 Visibility from outside. Permanent signage affixed to the outside of flood shields or flood control devices that block the egress door shall provide directions to first responders or other personnel seeking to locate the path into the space from the exterior.
      5. 3.2.5 Compliance with egress requirements. Such alternate means of egress shall meet all requirements of Chapter 10 of the New York City Building Code for a required means of egress, including, travel distances, hardware and signage. Where an alternate means of egress may be used as a means of egress at any time other than a flood event, temporary stairs and ramps shall not be permitted.
         
         Exceptions for buildings or portions of buildings that are planned to be evacuated during the design flood conditions:
         1. Such alternate means of egress shall not be required to comply with occupant load calculations of the New York City Building Code if its only purpose is to provide supplemental egress and ingress during conditions of flooding.
         2. The alternate means of egress may serve more than one required exit provided that the travel distances to and within the alternate means of egress comply with Item 3.2.1 and Item 3.2.2 from each required means of egress that is blocked by flood shields or flood control devices.
      6. 3.2.6 Accessibility. The alternate means of egress shall not be required to comply with Chapter 11 of the New York City Building Code if its only purpose is to provide supplemental egress and ingress during conditions of flooding, unless the structure is intended for occupancy during the design flood.
   3. 3.3 Egress and ingress blocked by shields serving dwelling units. For each means of egress required by Chapter 10 of the New York City Building Code that serves a dwelling unit and is to be blocked by flood shields or flood control devices, at least one alternate means of egress shall be provided capable of providing human ingress and egress during the design flood between the dry floodproofed area to the exterior. The alternate means of egress shall comprise either an elevated door opening directly to the exterior of the building arranged in accordance with Section 3.3.1 or an enclosure that incorporates wet floodproofing and is arranged in accordance with Section 3.3.2.
      1. 3.3.1 Elevated door. Where an elevated door is provided, such door shall be capable of providing human ingress and egress during the design flood. The elevated door shall open directly to the exterior of the building and shall be located in close proximity to the required means of egress to the exterior that is to be blocked by flood shields or flood control devices as follows:
         1. 3.3.1.1 Face of door. The face of the elevated door itself, and not merely its directional signage, shall be arranged so it is clearly visible to a person approaching the blocked egress door(s).
         2. 3.3.1.2 Elevation of door. Such door(s) shall be elevated to or above the applicable DFE specified in Table 6-1.
         3. 3.3.1.3 Compliance with egress requirements. Such door shall meet all New York City Building Code requirements for a required means of egress to the exterior of the structure including hardware and signage.
         4. 3.3.1.4 Accessibility. Such door may be accessed by open steps and shall not be required to comply with Chapter 11 of the New York City Building Code if its only purpose is to provide supplemental egress and ingress during conditions of flooding and to provide emergency egress at other times.
      2. 3.3.2 Enclosure that incorporates wet floodproofing. Where an enclosure which is partially wet floodproofed is used to provide alternate means of egress, such means of egress shall be capable of providing human ingress and egress during the design flood and shall be located in close proximity to the required means of egress to the exterior that is to be blocked by flood shields or flood control devices as follows:
         1. 3.3.2.1 Face of door to enclosure. The face of the door to the enclosure, and not merely its directional signage, shall be arranged so it is clearly visible to a person approaching the blocked egress door(s).
         2. 3.3.2.2 Wet floodproofing within an enclosure. Wet floodproofed portions of the enclosure shall be designed to comply with Section 6.3 and resist all flood related loads while prohibiting infiltration of floodwater to dry floodproofed spaces within the building.
         3. 3.3.2.3 Travel Distance. The path of travel from the alternate means of egress entrance door to the door leading to the exterior of the building shall not exceed 25 ft.
         4. 3.3.2.4 Compliance with egress requirements. The entrance and exit door shall meet all requirements of Chapter 10 of the New York City Building Code for a required means of egress to the exterior of the structure including hardware and signage.

Section 6.2.3. Section 6.2.3 (Limits on Human Intervention) is amended to read as follows:

Section 6.2.3 Limits on human intervention. Dry floodproofing measures that require human intervention to activate or implement prior to or during a flood, including temporary stairs or ramps, shall be permitted only when all of the following conditions are satisfied:

1. The flood warning time (alerting potential flood victims of pending flood situation) shall be a minimum of 12 h, unless the community operates a flood warning system and implements an emergency plan to ensure safe evacuation of flood hazard areas, in which case human intervention is allowed only if the community can provide a minimum flood warning time equal to or longer than the cumulative time:
   1. to notify persons responsible for installation of floodproofing measures,
   2. for responsible persons to travel to structure to be floodproofed,
   3. to install, activate, or implement floodproofing measures,
   4. to evacuate all occupants from the flood hazard area.
2. All removable shields or covers for openings such as windows, doors, and other openings in walls and temporary stairs or ramps shall be designed to resist flood loads specified in Section 1.6.
3. Where removable shields or temporary stairs or ramps are to be used, a flood emergency plan shall be approved by the authority having jurisdiction and shall specify, at a minimum, the following information: storage locations of the shields and temporary stairs and ramps; the method of installation and removal; conditions activating installation and removal; maintenance of shields and attachment devices and temporary stairs and ramps; periodic practice of installing and removing shields and temporary stairs and ramps; testing sump pumps and other drainage measures; and inspecting necessary material and equipment to activate or implement floodproofing. The flood emergency plan shall be posted permanently in at least two conspicuous locations within the structure.
4. Where removable shields or temporary stairs or ramps are to be used, they shall be stored on site within a building or within a secured, weather-resistant enclosure. Off-site storage shall be prohibited for buildings required to comply with Section G304.
5. Where removable shields or temporary stairs or ramps are proposed as per Section G304, periodic inspections, including a triennial full scale deployment, shall be conducted in accordance with Article 324 of the Administrative Code.

Section 7.1. Table 7-1 of Section 7.1 (General) is amended to read as follows (see Table 7-1 below):

TABLE 7-1
MINIMUM ELEVATION OF ATTENDANT UTILITIES AND EQUIPMENT

FLOOD DESIGN CLASSa	LOCATE ATTENDANT UTILITIES AND EQUIPMENT ABOVEb
	MINIMUM ELEVATION IN FLOOD HAZARD AREAS, OTHER THAN COASTAL HIGH-HAZARD AREAS AND COASTAL A-ZONES, RELATIVE TO DESIGN FLOOD ELEVATION (DFE)	MINIMUM ELEVATION IN COASTAL HIGHHAZARD AREAS AND COASTAL A-ZONES, RELATIVE TO DESIGN FLOOD ELEVATION (DFE)
1	DFE = BFE + 2 ft	DFE = BFE + 2 ft
2	DFE = BFE + 2 ft	DFE = BFE + 2 ft
3	DFE = BFE + 2 ft	DFE = BFE + 3 ft
4	DFE = BFE + 2 ft, or 500- year flood elevation, whichever is higher	DFE = BFE + 3 ft, or 500-year flood elevation, whichever is higher

1. See Table 1-1 for Flood Design Class descriptions.
2. Locate attendant utilities and equipment above elevations shown unless otherwise provided in Chapter 7 of ASCE 24.

Section 7.2.4. Section 7.2.4 (Panelboards, Disconnect Switches, and Circuit Breakers) is amended to read as follows:



Section 7.3.3. Section 7.3.3 is amended to read as follows:



Section 7.3.4. Section 7.3.4 is amended to read as follows:



Section 7.5.2. A new section 7.5.2 is added to read as follows:

7.5.2 Elevator signage. Where there is potential for an elevator cab to descend below the elevation specified in Table 7-1 into a wet floodproofed space, the elevator shall be equipped with controls that will prevent the cab from descending into floodwaters. Permanent, durable, and washable signage shall be placed in the elevator cab and in the elevator lobby on any story subject to flooding, stating that "In the event of flooding, water sensors in the elevator shaft will prevent the elevator from descending to [description of story, e.g., ground floor, first floor, parking level, etc.] and will automatically cause the elevator to rise to [description of story, e.g., second floor, mezzanine, etc.]."

Section 8.1. Section 8.1 (General) is amended to read as follows:

1. Resist flood-related loads specified in Section 1.6 and minimize transfer of floodrelated loads to the structure and structure foundation; or
2. Break away during design flood conditions without causing damage to the structure, including the foundation; or
3. Use materials that conform to Chapter 5 for those portions of stairways and ramps that are located below the elevations specified in Tables 2-1 and 4-1, including items such as gates and doors.

Section 9.4.1. The second sentence of the first paragraph of Section 9.4.1 (Attached Garages, Carports, and Accessory Storage Structures) is amended to read as follows:



Section 9.7. The first sentence of Section 9.7 (Tanks) is amended to read as follows: