Superseded Bench Mark Sheet for 8639207, Rudee Inlet VA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  04/06/1990
Station ID: 8639207                                SUPERCEDED DATE:   04/21/2003
Name:       VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL        
            VIRGINIA
NOAA Chart: 12207                                  Latitude:         36° 49.9' N
USGS Quad:  VIRGINIA BEACH                         Longitude:        75° 58.4' W


To reach the tidal bench marks from the post office in Virginia Beach, proceed
south on Pacific Avenue for 1.4 miles (2.3 km) to the bridge over Lake Rudee
(Inside Channel).  The bench marks are at 7th Street on the bridge, east of the
bridge along the boardwalk, and west of the bridge in the parking lot.  The tide
gage and staff were west of the bridge on a small finger pier at the Virginia
Beach Fishing Center.


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


                 PRIMARY BENCH MARK STAMPING:  9207 C 1984

MONUMENTATION:           Survey Disk                               VM#:     3505
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bridge Pillar Base


The bench mark is set in the most northerly pillar base underneath the bridge,
6.6 feet (2.0 m) WSW of the pillar center, 5.6 feet (1.7 m) ENE of the west
pillar, 4.6 feet (1.4 m) south of the north pillar, and 4.3 feet (1.3 m) north
of the south pillar.



                         BENCH MARK STAMPING:  E 311 1952

MONUMENTATION:           Survey Disk                               VM#:     3501
AGENCY:                                                            PID#:  FW0083
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is set in the top of the west end of the concrete curb on top of
a steel piling at the south end of a sea wall, 110 feet (34 m) east of the east
curbing of Atlantic Avenue, 81 feet (25 m) west of the SE corner of the sea wall
(in line with the north curbing of 7th Street), 1 foot (0.3 m) east of the west
end of the concrete curbing, and level with Atlantic Avenue.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  04/06/1990
Station ID: 8639207                                SUPERCEDED DATE:   04/21/2003
Name:       VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL        
            VIRGINIA
NOAA Chart: 12207                                  Latitude:         36° 49.9' N
USGS Quad:  VIRGINIA BEACH                         Longitude:        75° 58.4' W


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


                         BENCH MARK STAMPING:  6 1967

MONUMENTATION:           Survey Disk                               VM#:     3502
AGENCY:                                                            PID#:  FW0086
SETTING CLASSIFICATION:  Concrete Wing Wall


The bench mark is set flush in the top of a concrete post at the termination of
the wing wall at the NE end of the bridge, 9.5 feet (2.9 m) SW of a pine tree,
2.0 feet (0.6 m) east of the roadway on the bridge, and 3.5 feet (1.1 m) above
bridge level.



                         BENCH MARK STAMPING:  NO 6 1975

MONUMENTATION:           Survey Disk                               VM#:     3503
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Boardwalk


The bench mark is set in the SE corner of a concrete boardwalk south of 4th
Street, 40 feet (12 m) east of the SE corner of Schooner Motor Inn, 8 feet   (2
m) south of the second concrete rail support, 2.2 feet (0.7 m) north of the
south edge of the boardwalk, and 2 feet (1 m) west of the east edge of the
boardwalk.



                         BENCH MARK STAMPING:  9207 A 1984

MONUMENTATION:           Survey Disk                               VM#:     3504
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in a concrete monument south of Winston Salem Avenue near
Virginia Beach Fishing Center, 29.8 feet (9.1 m) north of the north edge of a
wooden dock, 2.7 feet (0.8 m) south of power pole #PO44, and 0.1 foot (0.03 m)
below the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  04/06/1990
Station ID: 8639207                                SUPERCEDED DATE:   04/21/2003
Name:       VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL        
            VIRGINIA
NOAA Chart: 12207                                  Latitude:         36° 49.9' N
USGS Quad:  VIRGINIA BEACH                         Longitude:        75° 58.4' W


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


                         BENCH MARK STAMPING:  9207 B 1984

MONUMENTATION:           Survey Disk                               VM#:     3506
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is south of Winston Salem Avenue near Virginia Beach Fishing
Center, near the NW corner of a tackle shop, 32.0 feet (9.8 m) north of a wooden
shed connected to the main building, 15.8 feet (4.8 m) SE of power pole #PO46,
15.0 feet (4.6 m) east of the parking area, 8 feet (2 m) west of the NW corner
of the building, and 0.1 foot (0.03 m) below the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  04/06/1990
Station ID: 8639207                                SUPERCEDED DATE:   04/21/2003
Name:       VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL        
            VIRGINIA
NOAA Chart: 12207                                  Latitude:         36° 49.9' N
USGS Quad:  VIRGINIA BEACH                         Longitude:        75° 58.4' W


                            T I D A L   D A T U M S 


Tidal datums at VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           MARCH - JUNE 1984
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8638610 HAMPTON ROADS


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

     HIGHEST OBSERVED WATER LEVEL (04/15/1984)         =   6.22
     MEAN HIGHER HIGH WATER                     MHHW   =   3.91
     MEAN HIGH WATER                            MHW    =   3.57
     MEAN TIDE LEVEL                            MTL    =   1.86
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   1.84
     MEAN LOW WATER                             MLW    =   0.15
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/02/1984)         =  -0.62

   * NGVD reference based on elevations published in Quad 360754, 1982, and NOS
     leveling of 1984. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     9207 C 1984                                 6.01      2.44
     E 311 1952                                 13.41      9.84
     6 1967                                     26.58     23.01
     NO 6 1975                                  12.65      9.08
     9207 A 1984                                 5.93      2.36
     9207 B 1984                                10.39      6.82


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                   PUBLICATION DATE:  04/06/1990
Station ID: 8639207                                SUPERCEDED DATE:   04/21/2003
Name:       VIRGINIA BEACH, LAKE RUDEE, INSIDE CHANNEL        
            VIRGINIA
NOAA Chart: 12207                                  Latitude:         36° 49.9' N
USGS Quad:  VIRGINIA BEACH                         Longitude:        75° 58.4' 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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