N.Y.C. Admin. Code § 28-104.7.6: § 28-104.7.6 City Datum.

All elevations noted in the construction documents shall be referred to and clearly identified as the North American vertical datum of 1988 (NAVD) as established and maintained by National Geodetic Survey of the National Ocean Service, National Oceanic and Atmospheric Administration or successor agency, which is hereby established as the city datum. Neither the United States coast and geodetic survey mean sea level datum of 1929, national geodetic vertical datum (NGVD) nor any of the five borough data as established by the former Board of Estimate and Apportionment shall be referred to in construction documents except as may be required for the purpose of demonstrating conversion to the NAVD. Conversions to NAVD shall be performed by registered design professionals or surveyors. Conversion to and from borough data, NGVD and NAVD shall be performed using tables 104.7.6.1 through 104.7.6.5.

Table 104.7.6.1

a

Bronx Elevations

To obtain equivalency:

NGVD Elevations

To obtain equivalency:

NAVD Elevations

8.422 to 8.495

—> add 2.608 —>

11.030 to 11.083

—> subtract between 1.030 and 1.083 —>

10.000

10.000

—> add 2.608 —>

12.608

—> subtract between 1.030 and 1.083 —>

11.525 to 11.578

7.392

—> add 2.608 —>

10.000

—> subtract between 1.030 and 1.083 —>

8.917 to 8.970

a. Conversions to and from NAVD as indicated in this table represent the likely range. The precise conversion depends on the latitude and longitude of the location in question, as determined by a surveyor.

Table 104.7.6.2

a

Brooklyn Elevations

To obtain equivalency:

NGVD Elevations

To obtain equivalency:

NAVD Elevations

8.546 to 8.572

—> add 2.547 —>

11.093 to 11.119

—> subtract between 1.093 and 1.119 —>

10.000

10.000

—> add 2.547 —>

12.547

—> subtract between 1.093 and 1.119 —>

11.428 to 11.454

7.453

—> add 2.547 —>

10.000

—> subtract between 1.093 and 1.119 —>

8.881 to 8.907

a. Conversions to and from NAVD as indicated in this table represent the likely range. The precise conversion depends on the latitude and longitude of the location in question, as determined by a surveyor.

Table 104.7.6.3

a

Manhattan Elevations

To obtain equivalency:

NGVD Elevations

To obtain equivalency:

NAVD Elevations

8.288 to 8.357

—> add 2.752 —>

11.040 to 11.109

—> subtract between 1.040 and 1.109 —>

10.000

10.000

—> add 2.752 —>

12.752

—> subtract between 1.040 and 1.109 —>

11.643 to 11.712

7.248

—> add 2.752 —>

10.000

—> subtract between 1.040 and 1.109 —>

8.891 to 8.960

a. Conversions to and from NAVD as indicated in this table represent the likely range. The precise conversion depends on the latitude and longitude of the location in question, as determined by a surveyor.

Table 104.7.6.4

a

Queens Elevations

To obtain equivalency:

NGVD Elevations

To obtain equivalency:

NAVD Elevations

8.361 to 8.381

—> add 2.725 —>

11.086 to 11.106

—> subtract between 1.086 and 1.106 —>

10.000

10.000

—> add 2.725 —>

12.725

—> subtract between 1.086 and 1.106 —>

11.619 to 11.639

7.275

—> add 2.725 —>

10.000

—> subtract between 1.086 and 1.106 —>

8.914 to 8.894

a. Conversions to and from NAVD as indicated in this table represent the likely range. The precise conversion depends on the latitude and longitude of the location in question, as determined by a surveyor.

Table 104.7.6.5

a

Staten Island Elevations

To obtain equivalency:

NGVD Elevations

To obtain equivalency:

NAVD Elevations

7.835 to 7.917

—> add 3.192 —>

11.027 to 11.109

—> subtract between 1.027 and 1.109 —>

10.000

10.000

—> add 3.192 —>

13.192

—> subtract between 1.027 and 1.109 —>

12.083 to 12.165

6.808

—> add 3.192 —>

10.000

—> subtract between 1.027 and 1.109 —>

8.891 to 8.973

a. Conversions to and from NAVD as indicated in this table represent the likely range. The precise conversion depends on the latitude and longitude of the location in question, as determined by a surveyor.