Superseded Bench Mark Sheet for 8725835, LIVERRPOOL, PEACE RIVER FL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:  10/19/1984
Station ID: 8725835                                SUPERCEDED DATE:   04/21/2003
Name:       LIVERPOOL, HUNTER CREEK                           
            FLORIDA
NOAA Chart: 11426                                  Latitude:         27°  2.6' N
USGS Quad:  FORT OGDEN                             Longitude:        81° 59.2' W


To reach the tidal bench marks proceed 11.5 miles (18.5 km) north along US
Highway 19 from Punta Gorda to the intersection of US Highway 19 and the
Sunnybreeze Golf Course Road.  Continue NW on Sunnybreeze Golf Course Road and
SW along the SSE side of the canal, continue on a dirt road to the Trailer Park.
 The bench marks are along the road leading to the Trailer Park and on the
Trailer Park grounds, and the gage and staff were on the County Dock.


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


                 PRIMARY BENCH MARK STAMPING:  5835 A 1977

MONUMENTATION:           Survey Disk                               VM#:     6082
AGENCY:                                                            PID#:  AF7408
SETTING CLASSIFICATION:  Concrete Pad


The bench mark is set into the concrete south of a turn-around at the Trailer
Park, 81.0 feet (24.7 m) SW of Bench Mark 5835 B 1977, 7.0 feet (2.1 m) south of
the edge of the shoreline and 2.0 feet (0.6 m) NE of a water tank.



                         BENCH MARK STAMPING:  5835 B 1977

MONUMENTATION:           Survey Disk                               VM#:     6083
AGENCY:                                                            PID#:  AF7409
SETTING CLASSIFICATION:  Concrete Pad


The bench mark is set into concrete SE of a turn-around, 37.0 feet (11.3 m)
south of a utility pole, 30.0 feet (9.1 m) south of the centerline of a dirt
road leading to the trailer park and 2.5 feet (0.8 m) east of the door into the
ladies rest room.

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

                                                   PUBLICATION DATE:  10/19/1984
Station ID: 8725835                                SUPERCEDED DATE:   04/21/2003
Name:       LIVERPOOL, HUNTER CREEK                           
            FLORIDA
NOAA Chart: 11426                                  Latitude:         27°  2.6' N
USGS Quad:  FORT OGDEN                             Longitude:        81° 59.2' W


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


                         BENCH MARK STAMPING:  LIVERPOOL B M 1 1956

MONUMENTATION:           Survey Disk                               VM#:     6084
AGENCY:                                                            PID#:  AF5100
SETTING CLASSIFICATION:  Iron Pipe


The bench mark is 387.0 feet (118.0 m) SE of a picnic shelter, 108.0 feet (32.9
m) west of Bench Mark LIVERPOOL 3, 99.0 feet (30.2 m) SW of the centerline of
the road leading SE and 44.5 feet (13.6 m) west of the west corner of a concrete
block store building, and is set into the top of a 0.3 foot diameter (0.1 m)
pipe projecting 1.4 feet (0.4 m).



                         BENCH MARK STAMPING:  LIVERPOOL B M 4 1959

MONUMENTATION:           Survey Disk                               VM#:     6085
AGENCY:                                                            PID#:  AF5099
SETTING CLASSIFICATION:  Concrete Pad


The bench mark is set into concrete in the south side of the floor as a picnic
shelter, 19.0 feet (5.8 m) west of the centerline of the boat ramp, 13.0 feet
(4.0 m) east of the extended centerline of the blacktopped road, 8.3 feet (2.5
m) west of the SE corner and 1.0 foot (0.3 m) north of the south side of the
picnic shelter floor.



                         BENCH MARK STAMPING:  LIVERPOOL 3

MONUMENTATION:           Survey Disk                               VM#:     6086
AGENCY:                                                            PID#:  AF5101
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set into the top of a concrete post, at ground level, 119.0
feet (36.3 m) NE of the shoreline, 108.0 feet (32.9 m) east of Bench Mark
LIVERPOOL B M I 1956, 47.0 feet (14.3 m) NE of the north corner of a concrete
block store building, 39.0 feet (11.9 m) SE of the centerline of the road
leading to the gas pumps for the boats and 1.2 feet (0.4 m) from a witness post.

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

                                                   PUBLICATION DATE:  10/19/1984
Station ID: 8725835                                SUPERCEDED DATE:   04/21/2003
Name:       LIVERPOOL, HUNTER CREEK                           
            FLORIDA
NOAA Chart: 11426                                  Latitude:         27°  2.6' N
USGS Quad:  FORT OGDEN                             Longitude:        81° 59.2' W


                            T I D A L   D A T U M S 


Tidal datums at LIVERPOOL, HUNTER CREEK based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           FEBRUARY-MAY 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8725110 NAPLES


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

     HIGHEST OBSERVED WATER LEVEL (05/04/1978)         =   3.81
     MEAN HIGHER HIGH WATER                     MHHW   =   2.21
     MEAN HIGH WATER                            MHW    =   1.93
     MEAN TIDE LEVEL                            MTL    =   1.19
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.57
     MEAN LOW WATER                             MLW    =   0.45
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (02/05/1978)         =  -1.43

   * NGVD reference based on adjustment of 1966 and NOS levels of 1977 - 1978. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     5835 A 1977                                 5.41      3.48
     5835 B 1977                                 6.76      4.83
     LIVERPOOL B M 1 1956                        6.73      4.80
     LIVERPOOL B M 4 1959                        5.12      3.19
     LIVERPOOL 3                                 5.92      3.99


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

                                                   PUBLICATION DATE:  10/19/1984
Station ID: 8725835                                SUPERCEDED DATE:   04/21/2003
Name:       LIVERPOOL, HUNTER CREEK                           
            FLORIDA
NOAA Chart: 11426                                  Latitude:         27°  2.6' N
USGS Quad:  FORT OGDEN                             Longitude:        81° 59.2' 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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