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Cary Environmental Monitoring Program: Hydrology Data 1993-2019
Victoria
R
Kelly
Cary Institute of Ecosystem Studies
kellyv@caryinstitute.org
https://orcid.org/0000-0003-3418-9211
2020-01-09
The Cary Institute of Ecosystem Studies Environmental Monitoring
Program is a long-term data collection program designed to understand
how the environment changes over time. The program includes monitoring
of climate including temperature and precipitation, as well as
variables related to air pollution, such as acid deposition and ozone,
and water pollution and streamwater hydrology. The Cary Institute of
Ecosystem Studies, Environmental Monitoring Program furnishes data
under the following conditions: The data have received quality
assurance scrutiny by our program, and, although we are confident of
the accuracy of these data, the Cary Institute will not be held liable
for errors in these data. Data are subject to change resulting from
updates in data screening or models used. Data citation: The following
is a standard citation for referencing data from the Cary Institute of
Ecosystem Studies, Environmental Monitoring Program: Cary Institute of
Ecosystem Studies, Environmental Monitoring Program. 2008 (or current
year). Cary Institute of Ecosystem Studies, Box AB, Millbrook, NY
12545, www.caryinstitute.org. Those wishing to publish data from the
Cary Institute of Ecosystem Studies, Environmental Monitoring Program
are encouraged to contact Data Manager Vicky Kelly,
kellyv@caryinstitute.org.
Cary Institute
stream
stream
hydrology
hydrology
conductivity
conductivity
conductance
conductance
temperature
temperature
discharge
discharge
flow
flow
Timeframe The data in this file start 2 April 1993 and end 31 December
2018. Data collection is ongoing. Geographic location The stream
gauging station is located on the East Branch of Wappinger Creek in
the Fern Glen on the Cary Institute property. GPS coordinates for the
site are N41.78707, W73.73317. Intellectual Rights This information is
released under the Creative Commons license -
Attribution-NonCommercial - CC BY- NC
(https://creativecommons.org/licenses/by/4.0/).
This information is released under the Creative Commons license -
Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/).
The consumer of these data (
Data User
herein) is
required to cite it appropriately in any publication that results from
its use. The Data User should realize that these data may be actively
used by others for ongoing research and that coordination may be
necessary to prevent duplicate publication. The Data User is urged to
contact the authors of these data if any questions about methodology
or results occur. Where appropriate, the Data User is encouraged to
consider collaboration or co-authorship with the authors. The Data
User should realize that misinterpretation of data may occur if used
out of context of the original study. While substantial efforts are
made to ensure the accuracy of data and associated documentation,
complete accuracy of data sets cannot be guaranteed. All data are made
available
as is.
The Data User should be aware,
however, that data are updated periodically and it is the
responsibility of the Data User to check for new versions of the data.
The data authors and the repository where these data were obtained
shall not be liable for damages resulting from any use or
misinterpretation of the data. Thank you.
1993-04-02
2019-12-31
ongoing
Victoria
R
Kelly
Cary Institute of Ecosystem Studies
kellyv@caryinstitute.org
https://orcid.org/0000-0003-3418-9211
Stream gauging and temperature equipment is located on the East Branch
of Wappinger Creek in the Fern Glen on the Cary Institute property.
GPS coordinates for the site are N41.78707, W73.73317. The stream is a
tributary to the main branch of Wappinger Creek, which flows into the
Hudson River at Wappingers Falls. Approximately 1.6 km upstream from
the gauging station is the Village of Millbrook sewage treatment
plant. In addition to the sewage treatment plant, Dietrich Pond and
its associated dam can influence the stream at the gauging station.
The gauging equipment is situated in a stilling well, which is located
on the leeward side of an old bridge abutment. Stream height is
monitored using a float and pulley system with a graduated tape
(formerly a wire). The pulley is connected to an incremental shaft
encoder, which is monitored using a datalogger. Stream temperature and
conductivity are monitored using a temperature/conductivity sensor,
which sits on the bed of the stream near the stilling well.
Instantaneous height, temperature and conductivity measurements are
recorded and stored every fifteen minutes. Rating curves for
estimating stream discharge were developed in 1987-1988, 1993-1994,
1996, 1997-1998 and 2003-2005 with periodic points checked in
intervening and subsequent years. Stream height was measured between
1986 and 1991 using a Leupold and Stevens, Inc. total flow meter
(model 61R) connected to a float and pulley. Stream temperature was
measured between 1987 and 1993 using a Weksler Instruments
Corporation, Temperature Chart Recorder, 10 inch. Data collected prior
to 1993 can be made available on request. In 1993, we began continuous
collection of stream height and temperature using a Handar, Inc. 570A
Data Acquisition System with an incremental shaft encoder (model 436A)
and a water temperature sensor (Handar, Inc., model 433FN
1993-Sept. 2003, Campbell Scientific model CS547A May 2005-present).
Stream height is checked with a fixed staff gauge (Sept. 1997-present)
and with a graduated tape on the pulley (July 2002-present). The
Handar 570A datalogger was replaced with a Campbell Scientific CR510
datalogger in September 2003. We began continuous stream conductivity
measurements in May 2005 using a Campbell Scientific CS547A
conductivity and temperature probe.
Rating Curve Equations: y = discharge (m^3/s) x = stage height (cm)
1993-1994 y = 0.0009x^2 + 0.0159x + 0.1192 R^2 = 0.9923, n=6 1996 y =
0.0024x^2 - 0.0168x + 0.1444 R^2 = 1, n=3 1997-1998 y = 0.0009x^2 -
0.0036x + 0.0557 R^2 = 0.9934, n=6 2001-2005 y = 0.0018x^2 - 0.0292x +
0.1178 R^2 = 0.9876, n=7
The instruments, their accuracy and our recommendation for the number
of significant figures to use: Please note that significant figures
may be reported beyond the accuracy of the instruments. Data are
reported in this manner to maintain the capability of backing out
calculations from the raw measurements. Instrument notes including
calibration, malfunctions, repairs and anecdotal information is
available upon request. The instruments, their accuracy and our
recommendation for the number of significant figures to use are:
HYDROLOGICAL INSTRUMENTS- MAKE, MODEL, DATES USED, SENSITIVITY,
RECOMMENDED SIGNIFICANT FIGURES Stream Height, 1986-1991 Leupold and
Stevens, Inc. total flow meter (model 61R). Stream Height and
Temperature, April 1993-present Handar, Inc., 570A Data Acquisition
System with incremental shaft encoder (model 436A) sensitivity 1/100
of a revolution, (pulley circumference 18 in. April 1993-July 2002,
37.5 cm July 2002-present), recommended significant figures 2; and
water temperature sensor (Handar, Inc., model 433FN 1993-Sept. 2003;
Campbell Scientific model CS547A May 2005-present) sensitivity 0.2
degrees C, 0.03 mScm^-1 recommended significant figures 2 for
temperature, 3 for conductivity. Stream height is checked with a fixed
staff gauge Sept. 1997-present and with a graduated tape on the pulley
July 2002-present. Handar 570A datalogger was replaced with a Campbell
Scientific CR510 datalogger in September 2003. The Handar, model 433FN
stream temperature sensor was replaced with a Campbell Scientific
CS547A conductivity and temperature probe in May 2005. Stream Velocity
for rating curves. Marsh-McBirney Model 201M portable water current
meter, upgraded to model 2000 in 2002.
HYDROLOGICAL DATA QUALITY ASSURANCE & QUALITY CONTROL PARAMETERS
& METHODS Stream data are downloaded from the datalogger every
week. Height data are checked for accuracy by comparing values with
the height registered on the pulley tape and on the fixed staff gauge.
Weekly checks are made during winter to determine if the stream is
frozen at the stilling well. A code value of 0, 1 or 2 is assigned to
each line of data to indicate if the stream was frozen. For each
weekly dataset a time series graph is used to identify outlier data
points. Any erroneous values that are obviously due to equipment
malfunction are replaced with missing value codes. Log files are kept
with a description of each site visit, and include calibration
information, measurement adjustments, probe cleaning, etc. At the end
of each year a time series graph is produced to look for outlier data
points. Questionable data are replaced with missing value codes. In
November 2001 adjustments were made to stream height data to account
for instrument drift and errors in set points. As a result, some of
the stream height values are below zero. Details of these adjustments
are available upon request.
Instrument notes including calibration schedule, malfunctions and
repairs, new instrumentation, anecdotal information etc. can be made
available on request.
Cary Hydrology Data.
Cary Hydrology Data.
Cary_Hydro_Data.csv
39813210
823beb1bfbe629eb0ccdbf687177c107
1
\r\n
column
,
date
Date in MM/DD/YYYY format where MM is month number, DD is date number and YYYY is year
date
MM/DD/YYYY
blank
empty cell
hour_min
Hour in hour_minute format in Eastern Standard Time. Note that data are from the preceding hour. For example, data for hour 0100 are from midnight to 1:00 a.m EST.
float
Eastern Standard Time
whole
0
2400
blank
empty cell
strm_tmp
Stream temperature (degrees Celsius)
float
degrees C
real
-3.11
28.48
blank
empty cell
strm_cond
conductivity corrected for temp to 25 C (mScm^-1)
float
mScm^-1
real
0.02
3.77
blank
empty cell
strm_ht
Height of stream (cm)
float
cm
real
-10.02
178.9
blank
empty cell
quest_ht
Code for if stream frozen, 0 = stream not frozen, 1 = stream frozen, 2 = stream may have been frozen, have no notes.
float
none
real
0
2
blank
empty cell
q
stream discharge (m^3/s)
float
m^3/s
real
0
52.5
blank
empty cell
900943