Idaho Source Water Delineations

Frequently-asked 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. Where did the data come from?
  2. What changes have been made?
• 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?
  6. Is there some other way to get the data?
  7. What hardware or software do I need in order to use the data set?
• Who wrote the metadata?

Delineations, also know as capture zones, were created as part of the State of Idaho Source Water Protection program.  The delineations can be classified as one of two categories: fixed radius and modeled.  Transient and surface water systems were delineated with the fixed radius method.  The remaining systems were delineated utilizing groundwater modeling.  Most delineations are structured as three polygons depicting 3-, 6-, & 10-year time of travel zone.

1. How should this data set be cited?
   
   
   Idaho Department of Environmental Quality, 20040414, Idaho Source Water Delineations: Idaho Department of Environmental Quality (IDEQ), Boise, ID USA.
   
   
   Online links:

   • http://data.insideidaho.org/util/zip.ashx?fn=http://data.insideidaho.org/data/IDEQ/downdata/sourceWaterDelineations_id_ideq.zip

   
   
2. What geographic area does the data set cover?
   
   
   Bounding coordinates:

   West: -117.507668

   East: -110.504477

   North: 49.026295

   South: 41.900603
   
   
3. What does it look like?
   
   
   Thumbnail image:
   
   
   
4. Does the data set describe conditions during a particular time period?
   
   
   Beginning date: 19990101

   Ending time: 20081101
   Currentness reference:

   20081101

   
   
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):

      • G-polygon (6374)
      • Label point (3)
      • GT-polygon composed of chains (4)
      • Point (4)
      
      
   2. What coordinate system is used to represent geographic features?
      
      
      The map projection used is Transverse Mercator.

      
      

      Projection parameters:

      Transverse Mercator

      Scale factor at central meridian: 0.999600

      Longitude of central meridian: -114.000000

      Latitude of projection origin: 42.000000

      False easting: 2500000.000000

      False northing: 1200000.000000

      
      

      Planar coordinates are encoded using coordinate pair.

      Abscissae (x-coordinates) are specified to the nearest 0.000000.

      Ordinates (y-coordinates) are specified to the nearest 0.000000.

      Planar coordinates are specified in meters.

      
      

      The horizontal datum used is North American Datum of 1983.

      The ellipsoid used is Geodetic Reference System 80.

      The semi-major axis of the ellipsoid used is 6378137.000000.

      The flattening of the ellipsoid used is 1/298.257222.

      
      Vertical coordinate system definition:

      Altitude system definition:

      Altitude resolution: 1.000000

      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

      
      
7. How does the data set describe geographic features?
   
   
   sourceWaterDelineations_id_ideq

   PWSNO

   Public Water System Number

   
   

   PWSNAME

   System name.

   
   

   SRCNUM

   Intra-system identfication number.

   
   

   ACRES

   Acreage (Source: ESRI)
                     

   
   

   Sequential unique whole numbers that are automatically generated.

   
   

   SHAPE_area

   Area of feature in internal units squared. (Source: ESRI)
                     

   
   

   Positive real numbers that are automatically generated.

   
   

   SHAPE_len

   Internal feature number. (Source: ESRI)
                     

   
   

   Sequential unique whole numbers that are automatically generated.

   
   

   SRCID

   A specific source identification value.  The code consists of the PWSNO apended with the SRCNUM.

   
   

   SRCNAME

   Name of the specific intake (Well 1, Salmon River intake, Mickey's spring, etc.) (Source: ESRI)
                     

   
   

   TOT

   Time of travel zone.

   
   

   HUC4CODE

   Numeric code that corresponds to USGS HUC4 data.

   
   

   HUC4NAME

   The name that corresponds with the HUC4 code.

   
   

   ALTPWSNO

   SDWIS PWS Number

   
   

   SHAPE

    (Source: ESRI)
                     

   
   

   Coordinates defining the features.

   
   

   AQUIFERNAM

   Aquifer Name

   
   

   SHAPE_LENG

   Feature geometry. (Source: ESRI)
                     

   
   

   Coordinates defining the features.

   
   

   Shape

   Feature geometry. (Source: ESRI)
                     

   
   

   Coordinates defining the features.

   
   

   TOTTYPE

   Time-of-Travel Type

   
   

   COUNTY

   County name

   
   
   deqgis83.DBO.PWS_SWA_RELATE

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   
   
   • Idaho Department of Environmental Quality
   
   
2. Who also contributed to the data set?
   
   
3. To whom should users address questions about the data?
   
   
   Sean Coyle

   Idaho Department of Environmental Quality

   GIS Analyst

   1410 North Hilton

   Boise, ID 83706

   USA

   
   

   208-373-0502 (voice)

   sean.coyle@deq.idaho.gov

These datasets are part of the Idaho Department of Environmental Quality's Source Water Protection program.

1. Where did the data come from?
   
   
   Type of source media: USGS DLG and USGS DEM

   Source scale denominator: 100000

   Source contribution:

   The groundwater models utilize the DLGs and DEMs.

   
   
2. What changes have been made?
   
   
   Date: Various (change 1 of 1)

   The delineations can be divided into fixed radius and modeled delineations.
   
   Fixed radius delineations (surface water and transient sources) were delineated by IDEQ staff using buffering tools.  All transient systems were selected from the Public Water System dataset (PWS) and buffered at 1000 meters.  Surfacewater systems were delineated at both 4- and 24-hour time of travel and bufferd at 500 meters.  To determine surface water time of travel, IDEQ staff utilized USGS annual average stream flow data to determine distance upstream from the source in 4- and 10-hours.  The distance upstream was measured off of USGS 1:100000-scale hydrology datasets and the stream segments buffered.
   
   Modeled delineations were delineated by either IDEQ staff, Washington Group International (WGI) contract staff, Barr Engineering Company staff, or University of Idaho hydrology staff.  Sources were modeled using WHAeM, a hydrologic modeling tool, and the 3-, 6-, &10-year time of travel paths were exported as AutoCAD dxf formatted files.  ArcView was used to on-screen digitize a shapefile from the linear dxf files.
   
   Both the fixed radius and modeled delineations attribute tables were formatted using an Avenue tool in ArcView.  The corrected shapefiles were then used as an input layer in the Potential Contaminant Inventory (PCI) process.
   

   
   

   Person responsible for change:
   

   Sean Coyle

   Idaho Department of Environmental Quality

   GIS Analyst

   1410 North Hilton

   Boise, ID 83706

   USA

   
   

   208-373-0502 (voice)

   208-373-0143 (FAX)

   sean.coyle@deq.idaho.gov

   
   

1. How well have the observations been checked?
   
   
2. How accurate are the geographic locations?
   
   

   These data are modeled approximations of groundwater capture zones.  A conservative deductive estimate for horizontal accuracy is 250 meters.  Be advised however, that these data were not developed to be a precise delineation but more a general estimate.

   
   
3. How accurate are the heights or depths?
   
   
4. Where are the gaps in the data? What is missing?
   
   

   As of the publication data, 90% of the initial assessments have delineations present.  As funds become available we will update the last 10%.

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

   Logical consistancy has not been checked on any of these data sets at this point.

   
   

Neither the State of Idaho nor the Idaho Department of Environmental Quality, nor any of their employees make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any information or data provided.  Metadata is provided for all data sets, and no data should be used without first reading and understanding its limitations. The data could include technical inaccuracies or typographical errors. The Department of Environmental Quality may update, modify, or revise the data used at any time, without notice.

Who distributes the data set?


Bruce Godfrey
Idaho Geospatial Data Clearinghouse
GIS Specialist
1000 West Hubbard Avenue, Suite 242
Coeur d'Alene, ID 83814-2277


208.292.1407 (voice)
bgodfrey@uidaho.edu


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


What legal disclaimers am I supposed to read?


Although these data have been processed successfully on a computer system at the Idaho Geospatial Data Clearinghouse, no warranty, expressed or implied, is made regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. 


How can I download or order the data?


• Availability in digital form:




Data format:	in format ESRI Shapefile (.shp) Size: 26.389
Network links:	http://data.insideidaho.org/util/zip.ashx?fn=http://data.insideidaho.org/data/IDEQ/downdata/sourceWaterDelineations_id_ideq.zip



• Cost to order the data: None



Is there some other way to get the data?


What hardware or software do I need in order to use the data set?

1410 North Hilton