HV1400 ***********************************************************************
HV1400  TIDAL BM    -  This is a Tidal Bench Mark.
HV1400  DESIGNATION -  X
HV1400  PID         -  HV1400
HV1400  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
HV1400  USGS QUAD   -  ANACOSTIA (1979)
HV1400
HV1400                         *CURRENT SURVEY CONTROL
HV1400  ___________________________________________________________________
HV1400* NAD 83(1986)-  38 52 25.     (N)    076 59 41.     (W)     SCALED
HV1400* NAVD 88     -         3.339  (meters)      10.95   (feet)  ADJUSTED
HV1400  ___________________________________________________________________
HV1400  GEOID HEIGHT-         -32.14  (meters)                     GEOID99
HV1400  DYNAMIC HT  -           3.338 (meters)      10.95  (feet)  COMP
HV1400  MODELED GRAV-     980,096.1   (mgal)                       NAVD 88
HV1400
HV1400  VERT ORDER  -  FIRST     CLASS II
HV1400
HV1400.The horizontal coordinates were scaled from a topographic map and have
HV1400.an estimated accuracy of +/- 6 seconds.
HV1400
HV1400.The orthometric height was determined by differential leveling
HV1400.and adjusted by the National Geodetic Survey in June 1991.
HV1400
HV1400.This Tidal Bench Mark is designated as VM 12745
HV1400.by the Center for Operational Oceanographic Products and Services.
HV1400
HV1400.The geoid height was determined by GEOID99.
HV1400
HV1400.The dynamic height is computed by dividing the NAVD 88
HV1400.geopotential number by the normal gravity value computed on the
HV1400.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HV1400.degrees latitude (g = 980.6199 gals.).
HV1400
HV1400.The modeled gravity was interpolated from observed gravity values.
HV1400
HV1400                          SUPERSEDED SURVEY CONTROL
HV1400
HV1400  NGVD 29     -         3.579  (m)           11.74   (f) ADJUSTED    1 2
HV1400
HV1400.Superseded values are not recommended for survey control.
HV1400.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV1400.See file dsdata.txt to determine how the superseded data were derived.
HV1400
HV1400_MARKER: DB = BENCH MARK DISK
HV1400_SETTING: 30 = DOORSILL
HV1400_STAMPING: X
HV1400_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
HV1400
HV1400  HISTORY     - Date     Condition        Recov. By
HV1400  HISTORY     - UNK      MONUMENTED       CGS
HV1400  HISTORY     - 1923     GOOD             CGS
HV1400  HISTORY     - 1955     GOOD             CGS
HV1400
HV1400                          STATION DESCRIPTION
HV1400
HV1400''DESCRIBED BY COAST AND GEODETIC SURVEY 1923
HV1400''IN WASHINGTON.
HV1400''IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
HV1400''NEAR THE NORTHEAST CORNER OF THE INTERSECTION OF DAHLGREN AVENUE
HV1400''AND MONTGOMERY SQUARE, ON THE WEST SIDE OF BUILDING 108, IN THE
HV1400''FIRST DOORWAY FROM THE SOUTH END OF THE BUILDING, IN THE GRANITE
HV1400''DOORSILL, 0.9 FOOT WEST OF THE DOOR, AND 0.3 FOOT NORTH OF
HV1400''THE SOUTH END OF THE DOORWAY.  A STANDARD DISK, STAMPED X.
HV1400
HV1400                          STATION RECOVERY (1955)
HV1400
HV1400''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
HV1400''RECOVERED IN GOOD CONDITION.