Depth to Initial Ground Water Sensitivity Rating, at 1:100,000-Scale

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• 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?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title:

Depth to Initial Ground Water Sensitivity Rating, at 1:100,000-Scale

Abstract:

This dataset represents an aquifer sensitivity rating for depth to initial ground water in the State of Wyoming. This dataset is specifically to be used within a DRASTIC-type aquifer sensitivity/vulnerability analysis. The dataset is in raster format with 100 meter cell size.

For more details about this dataset, please refer to this report:

Hamerlinck, J.D. and Arneson, C.S., editors, 1998, Wyoming Ground-Water Vulnerability Assessment Handbook: Volume 1. Background, Model Development, and Aquifer Sensitivity Analysis: Spatial Data and Visualization Center Publication SDVC 98-01-1, University of Wyoming, Laramie, WY.

1. How should this data set be cited?

   Wyoming Water Resources Center, 199702, Depth to Initial Ground Water Sensitivity Rating, at 1:100,000-Scale: Spatial Data and Visualization Center, Laramie, Wyoming.

   Online Links:

   • <URL:http://www.sdvc.uwyo.edu/clearinghouse/water.html>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -111.04531329

   East_Bounding_Coordinate: -103.84002217

   North_Bounding_Coordinate: 44.99712629

   South_Bounding_Coordinate: 40.94825784

3. What does it look like?

   <URL:http://www.sdvc.uwyo.edu/images/dtwrt100k.gif> (gif)

   depth to ground water ratings in Wyoming

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

   Beginning_Date: unknown

   Ending_Date: present

   Currentness_Reference: Publication date of sources

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

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

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 4491 x 5862, type Grid Cell

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:

      Standard_Parallel: 33

      Standard_Parallel: 45

      Longitude_of_Central_Meridian: -107.5

      Latitude_of_Projection_Origin: 41

      False_Easting: 0.00000

      False_Northing: 0.00000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in METERS

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The lone attribute within this layer is called VALUE (the default ARC/INFO GRID name) and represents a sensitivity rating between 1 and 10.

   Entity_and_Attribute_Detail_Citation: n/a

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

2. Who also contributed to the data set?

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

   SDVC Technical Coordinator
   Spatial Data and Visualization Center
   Box 4008 University Station
   Laramie, Wyoming 82071
   USA
   

   307-766-2532 (voice)
   itasca@uwyo.edu
   

   Hours_of_Service: 8 AM to 5 PM MST

This layer was developed specifically to aid in the creation of a Wyoming ground-water vulnerability to surface contamination study conducted at the Wyoming Water Resources Center. The DRASTIC-based model requires depth to initial ground water as one of its parameters. This layer was specifically developed to aid in intermediate-scale regional analysis within Wyoming.

1. From what previous works were the data drawn?

   100 Meter Depth to Ground Water (source 1 of 1)

   Arneson, C.S., 1998, Wyoming Depth to Initial Ground Water <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dtw100.html>.

   Type_of_Source_Media: digital map

   Source_Scale_Denominator: 100000

   Source_Contribution: ratings are derived directly from depth values

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

   Date: 1998 (process 1 of 1)

   Using the 100 meter resolution Wyoming Depth to Initial Ground Water dataset (Arneson, 1998; see link in Source Title above for related metadata) a series of rating equations were applied to make the dataset suitable for use in an additive-overlay type aquifer sensitivity model. The equations applied within ARC/INFO's GRID module were:

   DTW < 5 feet Rating = 10 DTW = 5-30 Rating = 10.60 - (0.12 X DTW) DTW = 30-100 Rating = 23.94 - (4.98 X ln(DTW)) DTW > 100 feet Rating = 1

   These rating equations defined by the Wyoming Water Resources Center produce a continuous curve similar to that outlined in EPA's DRASTIC manual (Aller et al. 1987). The curve begins at 1 and has a maximum value of 10. Calculations were done in ARC/INFO's GRID module at a 100 meter cell resolution.

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

1. How well have the observations been checked?

   see Process Steps

2. How accurate are the geographic locations?

   see Process Steps

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   All cells within the State of Wyoming are attributed.

5. How consistent are the relationships among the observations, including topology?

   does not apply for raster data

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

Access_Constraints: none

Use_Constraints:

This data should not be used for analysis at a resolution of less than 100 meters. Because updates to this dataset or the attached metadata will occur without notice, this dataset may not be redistributed or repackaged in any form without the express written consent of the University of Wyoming Spatial Data and Visualization Center. Instead it is recommended that additional users download the most current version of the data from <http://www.sdvc.uwyo.edu/clearinghouse>.

1. Who distributes the data set? (Distributor 1 of 1)

   Data Manager
   Spatial Data and Visualization Center
   Box 4008 University Station
   Laramie, Wyoming 82071
   USA
   

   307-766-2751 (voice)
   n/a
   

2. What's the catalog number I need to order this data set?

3. What legal disclaimers am I supposed to read?

   The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate used described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor described above and not indirectly through other sources which may have changed the data in some way. See the Use_Constraints section of this metadata for appropriate uses/limiations of the data. The distributor makes no claims for the data's suitability for other purposes.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	ARCE (Arc/Info export) (version 7.0.4)
     Network links:	ftp.sdvc.uwyo.edu or <http://www.sdvc.uwyo.edu/clearinghouse>

   • Cost to order the data:

     No fees are required for downloading the data that is on-line. Some fees may be required to cover costs of tapes if data is required on tape media.

Dates:

Last modified: 12-Aug-1998

Metadata author:

Margo Berendsen
Box 4008 University Station
Laramie, Wyoming 82071
USA

307-766-2751 (voice)
meh@uwyo.edu

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)