wri014246wlmap_gwpts

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Frequently anticipated questions:


What does this data set describe?

Title: wri014246wlmap_gwpts
Abstract:
The water-level from wells data (wri014246wlmap_gwpts, points) includes groundwater-level measurements from wells that were made specifically for the Cape May study, using a set of strategically selected locations that, along with stream water-level information, provided control for construction of an interpretive water-table contour map. Well selection was based on those wells that were relatively shallow (typically screened less than 150 feet deep) in order to represent shallow (unconfined) groundwater levels. The selected wells were either already existing in USGS’s NWIS database, or selected in the field and then later entered into the NWIS database. This data layer also includes well construction and related measurement information, and is the same as the groundwater-level data and interpretation presented in Spitz (1998), and Lacombe and Carleton (2002). The study area includes part of Tuckahoe River Basin, and includes but is not limited to the entire basins of Tarkiln Brook, Mill Creek, Fishing Creek, Dias Creek, Bidwell Creek, Goshen Creek, Dennis Creek, Sluice Creek, East Creek, and West Creek, and all of Cape May County, New Jersey, and parts of the New Jersey Counties of Atlantic and Cumberland. The horizontal datum of the water-levels from wells data layer is NAD 83, and the vertical datum is NGVD 29. The water-levels from wells data is one of four data layers used to present the water-level information for the Cape May study area. The four geographic data layers were developed at a scale of 1:24,000, and consist of; (1) the study area boundary (wri014246wlmap_bndry, polygon), (2) water-levels from wells (wri014246wlmap_gwpts, points), (3) water-levels from streams (wri014246wlmap_stmpts, points), and (4) an interpretive water-table contour map (wri014246wlmap_wlcont, lines). The water-level information for the unconfined aquifer system in the Cape May study area presented here is drawn from two reports of much larger scope, that include an assessment of the hydrogeologic framework, groundwater flow, availability of water supplies and salt-water intrusion. The information from the rest of the original reports are not available in geographic data layer form, but can be downloaded as PDF's of the complete original reports cited herein. The digital data sets that support unconfined-aquifer water-levels and interpretations for the Cape May study area are derived from one of nine hard copy published reports which contain similar data and information across other areas of southern New Jersey. Digital data sets for the unconfined-aquifer water-level and interpretive portions from all nine reports are being simultaneously released, motivated by development of an interactive web-viewer tool that enables convenient online viewing of the information (http://nj.usgs.gov/special/web_mapper/). Eight of the nine published reports are from a comprehensive unconfined-aquifer study series; Great Egg Harbor River (Watt and Johnson, 1992), Toms River (Watt and others, 1994), Upper Maurice River (Lacombe and Rosman, 1995), Mullica River (Johnson and Watt, 1996), Salem River (Johnson and Charles, 1997), Maurice River (Charles and others, 2001), Rancocas Creek (Watt and others, 2002), and Atlantic Coastal (Gordon, 2004). The ninth is this report which contains unconfined-aquifer water-level data and an interpretation from a comprehensive water-resource study in Cape May County (Spitz, 1998, Lacombe and Carleton, 2002).
  1. How should this data set be cited?

    U.S. Department of the Interior, U.S. Geological Survey, Spitz, F.J., Lacombe, P.J., and Carleton, G.B., Author, 20021231, wri014246wlmap_gwpts.

    Other_Citation_Details:
    PROJECTED COORDINATE SYSTEM UTM NAD 83; original projection was UTM NAD 27.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -74.966286
    East_Bounding_Coordinate: -74.635712
    North_Bounding_Coordinate: 39.291239
    South_Bounding_Coordinate: 38.93733

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 08-Apr-1991
    Ending_Date: 22-May-1991
    Currentness_Reference:
    Areal span, time span, and vertical span represented by the measured water levels.

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (81)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 UTM Zone 18N.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -75.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0001
      Ordinates (y-coordinates) are specified to the nearest 0.0001
      Planar coordinates are specified in meter

      The horizontal datum used is North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    wri014246wlmap_gwpts
    Groundwater points used to develop water table contour map in Cape May study area. (Source: USGS)

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    SiteID
    Site ID number (Source: USGS)

    Each record in the table has a unique 15-digit whole number identifier which references to USGS New Jersey Water Science Center's well database (NWIS).

    NJ_UID
    NJ Well ID number (Source: USGS)

    Each record in the table has a unique identifier which references to USGS New Jersey Water Science Center's well database (NWIS).

    Local_ID
    Local well ID (Source: USGS)

    Unique whole number ID - concatenated with local name

    Latitude
    Coordinate format: degrees, minutes, seconds (Source: USGS)

    Unique coordinate defining the latitude of the feature.

    Longitude
    Coordinate format: degrees, minutes, seconds (Source: USGS)

    Unique coordinates defining the longitude of the feature.

    Elevation_of_Land_Surface
    Feet above datum, NGVD 29 (Source: USGS)

    Unique value of land surface elevation in feet above datum (NGVD 29) associated with each well site.

    Depth_of_Well
    Feet below land surface (Source: USGS)

    Unique value of total depth of well derived from State of New Jersey well record or on-site measurement.

    Screened_Interval_Top
    Feet below land surface (Source: USGS)

    Unique value of depth to screened interval derived from State of New Jersey well record.

    Screened_Interval_Bottom
    Feet below land surface (Source: USGS)

    Unique value of depth of screened interval derived from State of New Jersey well record.

    Depth_to_Water
    Depth of water below land surface on measurement date. (Source: USGS)

    Unique value of dept-to-water made as part of project, typically a manual measurement.

    Altitude_of_Water_Level
    Calculated altitude of water, feet above vertical datum (NGVD 29). (Source: USGS)

    Unique value of altitude of groundwater, in feet above NGVD 29, calculated from elevation of land surface and depth-to-water.

    Date_Water_Level_Measured
    Date that manual measurement of depth-to-water was made. (Source: USGS)

    Unique date that manual measurement of depth-to-water was made as part of project.

    Date_Drilled
    Date well was drilled. (Source: USGS)

    Unique construction date reported from original State of New Jersey well record.

    NJ_Well_Permit
    New Jersey well permit number (Source: USGS)

    Unique numeric well identifier defined by the State of New Jersey.

    Aquifer_Code
    Aquifer in which well is screened and for which the water level is represented. (Source: USGS)

    Formal codeset
    Codeset Name:New Jersey local aquifer code
    Codeset Source:National Water Information System (NWIS) of U.S. Geological Survey, New Jersey Water Science Center

    Township
    Township in which well is located. (Source: USGS)

    Name of municipality in which well is located.

    Quad
    7.5-minute USGS quad (Source: USGS)

    Unique USGS 7.5-minute quad name in which well is located.

    NWISwebURL
    URL for linking to NWIS-Web (Source: USGS)

    Unique link to NWIS-Web site for on-line access to select well data and water-levels of record.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Spitz, F.J., 1998, Analysis of groundwater flow and saltwater encroachment in the shallow aquifer system of Cape May County, New Jersey, U.S. Geological Survey Water-Supply Paper 2490, 51 p. (page 11, figure 11a) http://pubs.er.usgs.gov/publication/wsp2490 Lacombe, P.J., and Carleton, G.B., 2002, Hydrogeologic framework, availability of water supplies, and saltwater intrusion, Cape May County, New Jersey, U.S. Geological Survey Water-Resources Investigations Report 01-4246, 152 p. (page 10 figure 5, page 63 figure 35, page 141 Appendix 1) http://pubs.usgs.gov/wri/wri014246

  3. To whom should users address questions about the data?

    U.S. Department of the Interior, U.S. Geological Survey
    3450 Princeton Pike, Suite 110
    Lawrenceville, New Jersey 08648
    US

    (609) 771-3900 (voice)
    (609) 771-3915 (FAX)
    dc_nj@usgs.gov

    Hours_of_Service: 8:00AM-4:30PM, Monday-Friday
    Contact_Instructions:
    Go to the website: http://nj.usgs.gov Or email: dc_nj@usgs.gov Or phone: (609) 771-3900


Why was the data set created?

The water-levels from wells data for the Cape May study includes groundwater levels, and related site and well construction information that were compiled, along with water levels measured in streams, to construct a water-table contour map. The water-table contour map can be used to provide an interpretive assessment of depth to water, water-table altitude, water-table gradients, and the direction of groundwater flow within the unconfined aquifer system. The study was performed in cooperation with the New Jersey Department of Environmental Protection for their purpose of developing a scientific basis to help address environmental, water-resource management and planning, water availability, water use, and water quality questions.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is also strongly recommended that careful attention be paid to the constraints of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.


Who wrote the metadata?

Dates:
Last modified: 10-Jun-2014
Metadata author:
U.S. Department of the Interior, U.S. Geological Survey
Attn: Emmanuel Charles, Jessica Centinaro, Leila Johnson
3450 Princeton Pike, Suite 110
Lawrenceville, New Jersey 08648
US

(609) 771-3900 (voice)
(609) 771-3915 (FAX)
dc_nj@usgs.gov

Hours_of_Service: 8:00AM-4:30PM, Monday-Friday
Contact_Instructions:
Go to the website: http://nj.usgs.gov Or email: dc_nj@usgs.gov Or phone: (609) 771-3900
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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