Superseded Bench Mark Sheet for 8722939, FT. LAUDERDALE BAHIA YACHT CLUB FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  10/09/1987
Station ID: 8722939                                SUPERCEDED DATE:   04/21/2003
Name:       FORT LAUDERDALE, BAHIA MAR YACHT CLUB, NEW RIVER S
            FLORIDA
NOAA Chart: 11470                                  Latitude:         26°  6.8' N
USGS Quad:  PORT EVERGLADES                        Longitude:        80°  6.5' W


To reach the tidal bench marks from the intersection of State Highway Alternate
A1A (Las Olas Blvd) and A1A at Fort Lauderdale, proceed south on State Highway
A1A for 0.45 mile (0.72 km) to the municipal parking lot across from Bahia Mar
Yacht Club.  The bench marks are located throughout the marina property.  The
tide gage and staff were located on a pier at the south side of the North Yacht
Basin.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  NO 1 1960

MONUMENTATION:           Survey Disk                               VM#:     5695
AGENCY:                                                            PID#:  AD2457
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set flush in the top of a concrete sea wall at the north end
of the fuel dock, 63.5 feet (19.4 m) north of the control tower of the Bahia Mar
Yacht Club, 19.5 feet (5.9 m) west of the NW corner of the marine supply store,
17.5 feet (5.3 m) west of the NW corner of the parking lot, 12.5 feet (3.8 m)
south of the south end of the westernmost finger pier of the North Yacht Basin,
and 2.3 feet (0.7 m) SSW of the northernmost light post along the waterway.



                         BENCH MARK STAMPING:  NO 4 1967

MONUMENTATION:           Survey Disk                               VM#:     5696
AGENCY:                                                            PID#:  AD2458
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set flush in the top of a east/west concrete sea wall, 302
feet (92 m) east of the NE corner of the marine supply store, 1 foot (0.3 m)
south of the SE corner of dock G, 0.2 foot (0.1 m) north of the north edge of
the parking lot, and at highway level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  10/09/1987
Station ID: 8722939                                SUPERCEDED DATE:   04/21/2003
Name:       FORT LAUDERDALE, BAHIA MAR YACHT CLUB, NEW RIVER S
            FLORIDA
NOAA Chart: 11470                                  Latitude:         26°  6.8' N
USGS Quad:  PORT EVERGLADES                        Longitude:        80°  6.5' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  2939 G 1981

MONUMENTATION:           Survey Disk                               VM#:     5697
AGENCY:                                                            PID#:  AD5870
SETTING CLASSIFICATION:  Stainless Steel Rod in Sleeve


The bench mark is 59.0 feet (21.0 m) east of the centerline of the northbound
lane of State Highway A1A, 58.2 feet (17.7 m) SW of the SW corner of the parking
lot toll booth, and 3.5 feet (1.1 m) SSW of a royal palm tree.  The bench mark
is the highest point of a stainless steel rod in sleeve surrounded by a pipe
with stamped access cover.



                         BENCH MARK STAMPING:  2939 H 1981

MONUMENTATION:           Survey Disk                               VM#:     5698
AGENCY:                                                            PID#:  AD5871
SETTING CLASSIFICATION:  Stainless Steel Rod in Sleeve


The bench mark is 112 feet (34 m) NW of Bench Mark 2939 G 1981, 102.7 feet (31.3
m) east of the north bound lane of State Highway A1A, 81 feet (25 m) NW of the
NNW corner of the parking lot toll booth, 18.7 feet (5.7 m) north of the
centerline of the northernmost driveway of the parking lot, and 4.9 feet (1.5 m)
south of the south side of a sidewalk.  The bench mark is the highest point of a
stainless steel rod in sleeve surrounded by a pipe with access cover and is 0.3
foot (0.1 m) below ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  10/09/1987
Station ID: 8722939                                SUPERCEDED DATE:   04/21/2003
Name:       FORT LAUDERDALE, BAHIA MAR YACHT CLUB, NEW RIVER S
            FLORIDA
NOAA Chart: 11470                                  Latitude:         26°  6.8' N
USGS Quad:  PORT EVERGLADES                        Longitude:        80°  6.5' W


                            T I D A L   D A T U M S 


Tidal datums at FORT LAUDERDALE, BAHIA MAR YACHT CLUB, NEW RIVER S based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           MAY 1970-APRIL 1971
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8723170 MIAMI BEACH


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (10/14/1970)         =   3.93
     MEAN HIGHER HIGH WATER                     MHHW   =   2.71
     MEAN HIGH WATER                            MHW    =   2.59
     MEAN TIDE LEVEL                            MTL    =   1.38
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.84
     MEAN LOW WATER                             MLW    =   0.17
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (04/26/1971)         =  -0.92

   * NGVD is based on elevations published in Quad 260802, 3/72 and NOS leveling
     of 1981. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1960                                   5.88      3.29
     NO 4 1967                                   5.46      2.87
     2939 G 1981                                14.56     11.91
     2939 H 1981                                14.04     11.42


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  4

                                                   PUBLICATION DATE:  10/09/1987
Station ID: 8722939                                SUPERCEDED DATE:   04/21/2003
Name:       FORT LAUDERDALE, BAHIA MAR YACHT CLUB, NEW RIVER S
            FLORIDA
NOAA Chart: 11470                                  Latitude:         26°  6.8' N
USGS Quad:  PORT EVERGLADES                        Longitude:        80°  6.5' W


                             D E F I N I T I O N S


Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch.  It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint.  NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929.  Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum.  As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.

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