Superseded Bench Mark Sheet for 8729849, BAYOU CHICO FL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:  04/27/1984
Station ID: 8729849                                SUPERCEDED DATE:   04/21/2003
Name:       WARRINGTON, BAYOU CHICO                           
            FLORIDA
NOAA Chart: 11383                                  Latitude:         30° 24.1' N
USGS Quad:  WEST PENSACOLA                         Longitude:        87° 15.2' W


To reach the tidal bench marks from the intersection of Pace Boulevard (SR 292)
and West Garden Street (U.S. Highway 98 Business) in Pensacola, proceed south
for 1.3 miles (2.1 km) on Pace Boulevard to the intersection of Barrancas Avenue
and Lakewood Road, along Lakewood Road 0.4 miles (0.6 km) to Audusson Avenue,
then 0.1 miles (0.2 km) on Audusson Avenue to Recho Bell Marine Service and
Bayou Chico.  The bench marks are located on the Recho Bell Marine Service
property and near the WCOA Radio Station and the tide gage and staff were
located on the easternmost dock at Recho Bell Marine Service.


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


                 PRIMARY BENCH MARK STAMPING:  9849 A 1977

MONUMENTATION:           Survey Disk                               VM#:    10273
AGENCY:                                                            PID#:  BG3653
SETTING CLASSIFICATION:  Concrete Wall


The bench mark is set flush in the concrete wall along the east property line of
the Recho Bell Marine Service, 70 feet (21 m) east of the NE corner of Mr. Recho
Bells residence, 58.5 feet (17.8 m) SSE of the north end of the concrete wall at
the waters edge, and 2 feet (1 m) north of the south end of the concrete wall.



                         BENCH MARK STAMPING:  9849 B 1977

MONUMENTATION:           Survey Disk                               VM#:    10274
AGENCY:                                                            PID#:  BG3652
SETTING CLASSIFICATION:  Copper-Clad Steel Rod


The bench mark is NE of the intersection of Audusson Avenue and Lakewood Road,
47 feet (14 m) west of the SW corner of house at 3 Audusson Avenue, 31 feet (9
m) SE of centerline of Audusson Avenue, 27 feet (8 m) NNW of centerline of
Lakewood Road, and 3.4 feet (1.0 m) east of power pole.  The bench mark is 0.4
foot (0.1 m) below ground level, crimped to a copper-clad steel rod driven 40
feet (12 m), and encased in a PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  04/27/1984
Station ID: 8729849                                SUPERCEDED DATE:   04/21/2003
Name:       WARRINGTON, BAYOU CHICO                           
            FLORIDA
NOAA Chart: 11383                                  Latitude:         30° 24.1' N
USGS Quad:  WEST PENSACOLA                         Longitude:        87° 15.2' W


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


                         BENCH MARK STAMPING:  9849 C 1977

MONUMENTATION:           Survey Disk                               VM#:    10275
AGENCY:                                                            PID#:  BG3649
SETTING CLASSIFICATION:  Copper-Clad Steel Rod


The bench mark is SE of the dirt drive leading SW from Lakewood Road to the
broadcast towers, 110 feet (34 m) west of the NE corner of the broadcast
building at the WCOA Radio Station, 43 feet (13 m) SW of the centerline of
Lakewood Road, and 3.5 feet (1.1 m) west of a power pole with a witness sign.
The bench mark is 0.3 foot (0.1 m) below ground level, crimped to a copperclad
steel rod driven 40 feet (12 m), and encased in a PVC pipe and concrete
kickblock.



                         BENCH MARK STAMPING:  9849 D 1977

MONUMENTATION:           Survey Disk                               VM#:    10276
AGENCY:                                                            PID#:  BG3651
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in the foundation of a storage building behind the
WCOA Radio Station, 165.5 feet (50.4 m) SSW ofthe centerline of Lakewood Road,
27.3 feet (8.3 m) SW of the SW corner of the WCOA Broadcast Building, and 1.8
feet (0.5 m) east of the NW corner of the storage building foundation.



                         BENCH MARK STAMPING:  9849 E 1977

MONUMENTATION:           Survey Disk                               VM#:    10277
AGENCY:                                                            PID#:  BG3650
SETTING CLASSIFICATION:  Concrete Footing


The bench mark is set flush in the SW corner of the easternmost radio tower
footing, and 361 feet (110 m) south of the SE corner of the WCOA Radio Station
Broadcast Building on Lakewood Road.

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

                                                   PUBLICATION DATE:  04/27/1984
Station ID: 8729849                                SUPERCEDED DATE:   04/21/2003
Name:       WARRINGTON, BAYOU CHICO                           
            FLORIDA
NOAA Chart: 11383                                  Latitude:         30° 24.1' N
USGS Quad:  WEST PENSACOLA                         Longitude:        87° 15.2' W


                            T I D A L   D A T U M S 


Tidal datums at WARRINGTON, BAYOU CHICO based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           MARCH-MAY 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8729840 PENSACOLA


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

     HIGHEST OBSERVED WATER LEVEL (04/20/1977)         =   2.00
     MEAN HIGHER HIGH WATER                     MHHW   =   1.25
     MEAN HIGH WATER                            MHW    =   1.20
     MEAN TIDE LEVEL                            MTL    =   0.63
     MEAN LOW WATER                             MLW    =   0.05
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/01/1977)         =  -1.23

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     9849 A 1977                                12.21     11.01
     9849 B 1977                                19.49     18.29
     9849 C 1977                                22.07     20.87
     9849 D 1977                                22.79     21.59
     9849 E 1977                                25.07     23.87


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

                                                   PUBLICATION DATE:  04/27/1984
Station ID: 8729849                                SUPERCEDED DATE:   04/21/2003
Name:       WARRINGTON, BAYOU CHICO                           
            FLORIDA
NOAA Chart: 11383                                  Latitude:         30° 24.1' N
USGS Quad:  WEST PENSACOLA                         Longitude:        87° 15.2' 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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