U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8542699 PUBLICATION DATE: 08/14/2003
Name: NORWOOD, DARBY CREEK
PA
NOAA Chart: 12312 Latitude: 39° 52.8' N ( 39.88000)
USGS Quad: LANDSDOWNE Longitude: 75° 17.4' W ( -75.29000)
To reach the tidal bench marks from Philadelphia International Airport, proceed
6.0 km (3.7 mi) SW on Interstate Highway 95 to the exit for State Route 420
(Wannamaker Avenue), then exit and proceed NW on State Route 420 for 1.0 km (0.6
mi) to Chester Pike (US Route 13), then turn right on Chester Pike and proceed
NE for 1.6 km (1.0 mi) NW to Winona Avenue, then turn right and proceed SE on
Winona Avenue to a dirt access road for the Norwood Boys Club and Morton House
Historical Site, then proceed on the dirt road to an old boat ramp on Darby
Creek. The bench marks are along the dirt road. The tide gage and staff were
on a wooden pile platform about 8 m (25 ft) south of the north bank of Darby
Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2699 D 1976
DESIGNATION: 854 2699 D
MONUMENTATION: Tidal Station disk VM#: 2914
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 39° 52.8' N ( 39.88000) LONGITUDE: 75° 17.4' W ( -75.29000)
The primary bench mark is a disk set near the foot of the old wooden boat ramp
and bulkhead, about 46 m (150 ft) south of bench mark 2699 A 1976, 2 m (5 ft)
north of the wooden bulkhead, and 2 m (5 ft) east of the extended centerline of
the boat ramp. The bench mark is crimped to the top of an unspecified deep rod
driven 9.8 m (32 ft) to substantial resistance, and encased in a 4-inch PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8542699 PUBLICATION DATE: 08/14/2003
Name: NORWOOD, DARBY CREEK
PA
NOAA Chart: 12312 Latitude: 39° 52.8' N ( 39.88000)
USGS Quad: LANDSDOWNE Longitude: 75° 17.4' W ( -75.29000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2699 A 1976
DESIGNATION: 854 2699 A
MONUMENTATION: Tidal Station disk VM#: 2911
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 39° 52.8' N ( 39.88000) LONGITUDE: 75° 17.4' W ( -75.29000)
The bench mark is a disk set near Norwood Boys Club, 48 m (157 ft) north of the
old wooden boat ramp and bulkhead, and 1 m (3 ft) SW of the SW corner of the
chain link fence surrounding Norwood Boys Club. The bench mark is set level
with the ground, crimped to the top of an unspecified deep rod driven 11.6 m (38
ft) to substantial resistance, and encased in a 4-inch PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 2699 B 1976
DESIGNATION: 854 2699 B
MONUMENTATION: Tidal Station disk VM#: 2912
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 39° 52.8' N ( 39.88000) LONGITUDE: 75° 17.4' W ( -75.29000)
The bench mark is a disk set to the south of a dirt road behind Norwood Boys
Club and paralleling the north bank of Darby Creek, 66 m (217 ft) west of bench
mark 2699 A 1976, and 4.11 m (13.5 ft) SE of the centerline of the dirt road.
The bench mark is set level with the ground, crimped to the top of an
unspecified deep rod driven 9.4 m (31 ft) to substantial resistance, and encased
in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8542699 PUBLICATION DATE: 08/14/2003
Name: NORWOOD, DARBY CREEK
PA
NOAA Chart: 12312 Latitude: 39° 52.8' N ( 39.88000)
USGS Quad: LANDSDOWNE Longitude: 75° 17.4' W ( -75.29000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2699 C 1976
DESIGNATION: 854 2699 C
MONUMENTATION: Tidal Station disk VM#: 2913
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 39° 52.8' N ( 39.88000) LONGITUDE: 75° 17.4' W ( -75.29000)
The bench mark is a disk set near a small foot path leading to the rear of a
house on East Winona Drive, 66 m (215 ft) NNW of bench mark 2699 B 1976, and 2 m
(6 ft) NE of the foot path. The bench mark is set level with the ground,
crimped to the top of an unspecified deep rod driven 10.7 m (35 ft) to
substantial resistance, and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 2699 E 1976
DESIGNATION: 854 2699 E
MONUMENTATION: Tidal Station disk VM#: 2915
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete driveway OPUS PID:
LATITUDE: 39° 52.8' N ( 39.88000) LONGITUDE: 75° 17.4' W ( -75.29000)
The bench mark is a disk set flush in the concrete driveway of the Borough of
Norwood Municpal Pumping Station between 129 and 131 Martin Lane, 18.32 m (60.1
ft) NW of the NW corner of the residence at 129 Martin Lane, 13.23 m (43.4 ft)
north of an 2 m (8 ft) high barbed wire fence surrounding the pumping station,
6.22 m (20.4 ft) south of the centerline of Martin Lane, 4.51 m (14.8 ft) west
of power pole #M-4, and 1.34 m (4.4 ft) west of the centerline of the driveway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8542699 PUBLICATION DATE: 08/14/2003
Name: NORWOOD, DARBY CREEK
PA
NOAA Chart: 12312 Latitude: 39° 52.8' N ( 39.88000)
USGS Quad: LANDSDOWNE Longitude: 75° 17.4' W ( -75.29000)
T I D A L D A T U M S
Tidal datums at NORWOOD, DARBY CREEK based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: July 1977 - November 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8545530 PHILADELPHIA (PIER 11 NORTH), DEL. RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.937
MEAN HIGH WATER MHW = 1.826
MEAN SEA LEVEL MSL = 1.011
MEAN TIDE LEVEL MTL = 0.943
MEAN LOW WATER MLW = 0.060
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2699 D 1976 2.339 0.513
2699 A 1976 3.005 1.179
2699 B 1976 3.117 1.291
2699 C 1976 3.961 2.135
2699 E 1976 4.740 2.914
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8542699 PUBLICATION DATE: 08/14/2003
Name: NORWOOD, DARBY CREEK
PA
NOAA Chart: 12312 Latitude: 39° 52.8' N ( 39.88000)
USGS Quad: LANDSDOWNE Longitude: 75° 17.4' W ( -75.29000)
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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
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.