Watershed 77 Well J Data, 2005-2016.

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Amatya, Devendra M. and Trettin, Carl C.
Publication_Date: 2016
Title:
Watershed 77 Well J Data, 2005-2016.
Geospatial_Data_Presentation_Form: database
Description:
Abstract:
On February 15, 2005 a new well was excavated adjacent to the Conifer 1 WL40 unit and manual well w27708 on Watershed 77. A Global Water WL15 pressure transducer (datalogger and linked sensor) was installed in the well, and shortly thereafter hourly measurements of water table level began. The WL15 unit was replaced by a WL16 pressure transducer on August 11, 2010.
Purpose:
The purpose of this well was to expand the temporal scale, range and frequency with which water table measurement data were acquired at the site and to increase knowledge about the relationship of water table to precipitation, runoff, evapotranspiration (ET) and other related eco-hydrologic and biogeochemical processes.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2005
Ending_Date: 2016
Currentness_Reference:
ground condition
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
The geographic area covered by the dataset is Well J on Watershed 77 in the Santee Experimental Forest.
Bounding_Coordinates:
West_Bounding_Coordinate: -79.78153
East_Bounding_Coordinate: -79.762998
North_Bounding_Coordinate: 33.150065
South_Bounding_Coordinate: 33.132841
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Forested watersheds
Theme_Keyword: Water Table
Theme_Keyword: pressure transducer
Theme_Keyword: WL15
Theme_Keyword: WL16
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: South Carolina
Place_Keyword: Coastal Plain
Place_Keyword: Santee Experimental Forest
Place_Keyword: Watershed 77
Access_Constraints: None
Use_Constraints:
These data were collected by USDA Forest Service researchers. In order to use the data in a publication, presentation or other research product you must agree to acknowledge its source. Please use the reference below when citing this work:

(Data name) courtesy of the USDA Forest Service Center for Forested Wetlands Research.

The following statement may be added after an acknowledgement or credit:

The USDA Forest Service Center for Forested Wetlands Research homepage is http://www.srs.fs.usda.gov/charleston/.
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Original water level measurements were in feet above the pressure transducer (with a precision of 0.01 feet). These measurements were later converted to centimeters below ground surface and elevation (in meters) relative to mean sea level.
Logical_Consistency_Report:
Visual inspection of electronically plotted water table data and comparison with precipitation data from the Met 5 weather station on this watershed was employed to expose anomalous values for the expected response of water table to rainfall.
Completeness_Report:
Hourly measurements were recorded by the datalogger, except during the occasional battery failure or equipment malfunction.
Lineage:
Methodology:
Methodology_Type: Field
Methodology_Description:
On February 15, 2005 Well J was installed using a manufactured Blue Tip well point, extended to 3.05 meters (m) in length using 3.8 centimeter (cm) diameter PVC pipe, following standard installation procedures. An auger was used to bore a hole approximately 7.6 cm in diameter, the screen and riser pipe were placed into the hole, and a gravel pack was added around the pipe along the screened section and up to about 15 cm below the ground surface. Bentonite clay was added to the top 15 cm of the bore hole as a seal to prevent percolation of surface water. Total well depth was approximately 3.05 m below ground surface.

A Global Water WL15 pressure transducer (datalogger and linked sensor) was immediately installed in the well, and the datalogger was set to record water level every hour.

The well was visited approximately every two weeks and the most recently acquired data was downloaded from the datalogger to a laptop computer using Global Logger software. Water level readings were manually checked by using a Hydrolite device inside the well after removing the WL15 unit. Starting in May 2009 this measurement was performed using a Solinst Mini 101 water level meter.

2/28/05 Datalogger removed for calibration.
3/2/05 Datalogger re-installed.
3/10/05 Well purged.
4/12/05 Batteries failed as well as cable partially unwound.
5/5/05 Batteries replaced and cable wound.
10/10/05 Battery failure.
10/13/05 Batteries replaced.
The WL15 unit was removed from the well on 6/8/07 in advance of a prescribed burn on WS 77 and reinstalled on 6/11/07.
The WL15 unit was removed from the well on 4/21/09 in advance of a prescribed burn on WS 77 and reinstalled on 4/22/09.
1/5/10 Battery failure.
1/6/10 Batteries replaced.
5/20/10 Battery failure and replacment.
The WL15 unit failed on 7/27/10 and was replaced by a new WL16 pressure transducer on 8/11/10. After that point data was downloaded to a laptop computer in the field using Global Logger II software.
The WL16 unit was pulled in advance of a possible prescribed burn on 3/1/13; the burn was performed on 3/5/13 and the WL16 was reinstalled on 3/6/13 (but recording interval was not changed back to hourly from daily). On 3/20/13 the above oversight was corrected and the recording interval was reset to hourly.
1/21/2016: Data from 1/21/16 to 2/19/16 probably unusable because of drift.
2/11/2016: WL16 removed to the lab around 11:00 for calibration; returned to site before 12:00.
2/19/2016: Replacement WL16 (with USB port) installed 2/19/16,
4/18/2016: Datalogger removed from well in advance of WS77 prescribed burn.
4/20/2016: Reinstalled datalogger.
Process_Step:
Process_Description:
Water level data was transferred to an electronic database at the office. Using information about the height of the well above ground surface and its elevation relative to mean sea level allowed for calculation and plotting of water table level below ground surface (in centimeters) and relative to mean sea level (in meters).

Ground surface elevation of Well J is 9.6748 meters above sea level.
Process_Date: Unknown
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Location = watershed name (WS77 = Watershed 77);
Instr_ID = instrument name (Well J = datalogger/sensor unit in Well J);
Date_time = instantaneous date and time associated with water table data (format MM/DD/YYYY HH:MM);
Date_ = date associated with water table data (format MM/DD/YYYY);
Time24_ = nearest hour associated with water table data (0-23), in hours;
Depth_cm_b (alias 'Depth below ground surface') = depth, cm below ground surface, in cm (positive values represent levels above ground surface and negative values represent levels below ground surface);
elev_m_asl (alias 'Elevation above mean sea level') = elevation, m above sea level, in m; and
Sample_Int = sample interval, in hours.

All missing data were originally assigned the value "-9999"; during database development this code was changed to "null"

Depths below ground surface and elevations above mean sea level for periods where the water table was below the detection limit of the sensor have been assigned the value "dry"
Entity_and_Attribute_Detail_Citation:
None
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Metadata_Reference_Information:
Metadata_Date: 20160212
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service, Southern Research Station, Center for Forested Wetlands Research
Contact_Person: Andy Harrison
Contact_Position: Hydrology Technician
Contact_Address:
Address_Type: mailing and physical
Address: 3734 Hwy 402
City: Cordesville
State_or_Province: SC
Postal_Code: 29434
Country: USA
Contact_Voice_Telephone: 843 336-5603
Metadata_Standard_Name: FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001.1-1999
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