Critical Aquifer Recharge Areas

Metadata also available as - [Outline]

Frequently anticipated questions:

What does this data set describe?

Title: Critical Aquifer Recharge Areas
Abstract: Critical Aquifer Recharge Areas
Link to King County Critical Area home page: <> Link to the King County Critical Area Ordinance User's Manual for the CARA: <> Link to King County Best Available Science paper for the CARA: <> Washington State Department of Health Well Head Protection Area and Sole Source aquifer data can be downloaded: <>
  1. How should this data set be cited?

    County, King, 20050404, Critical Aquifer Recharge Areas: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.541763
    East_Bounding_Coordinate: -121.341360
    North_Bounding_Coordinate: 47.781959
    South_Bounding_Coordinate: 47.147729

  3. What does it look like?

    <> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

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

    Calendar_Date: 15-Oct-2008
    Currentness_Reference: publication date

  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):

      • GT-polygon composed of chains (0)

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

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00025
      Ordinates (y-coordinates) are specified to the nearest 0.00025
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      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?

    Polygon attribute table (Source: King County)

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Acres as measured by GIS. (Source: King County)

    Range of values

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Feature area in square feet. (Source: ESRI)

    Feature perimeter in feet. (Source: ESRI)

    Critical Aquifer Recharge Area codes (Source: King county)

    CARA IAreas of unincorporated KC that have 'H'- ASGWC within a sole source area
    CARA IIAreas of unincorporated KC that have a 'M' - ASGWC within a sole source area
    CARA IIIAreas of Vashon-Maury Island not already CARA I or II

    This dataset depicts Critical Aquifer Recharge Area classes as determined by the source dataset (ASGWC95, KCWHPA, SSAQUIF) analysis.
    Entity_and_Attribute_Detail_Citation: None

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?

    Groundwater Protection Program and University of Washington Department of Earth and Space Science. See also Eric Ferguson, DNRP/WLRD/Groundwater Group,206-263-6512 for more details.

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

    King County Dept. of Natural Resources and Parks, Water and Lands Resources Division
    Attn: Ken Rauscher
    Senior GIS Analyst
    201 South Jackson Street, Suite 706
    Seattle, WA 98104

    206-296-1922 (voice)

Why was the data set created?

Developed as part of King County proposed amendments to it's Critical Areas Ordinance; it took effect on 01/01/2005. State law required KC to review and update; if necessary; its CARA provisions in order to ensure that the county's regulations are adequately protecting aquifers that are used to supply drinking water and sustain King County's natural water systems. Incorporated areas have been excluded from this layer intentionally, as this layer represents a unique land use standard defined only for unicorporated County areas. The following data was used in the Critical Aquifer Recharge Area Analysis: ASGWC [recently updated] Areas Susceptible to Groundwater Contaminati sdh_tot5yr (utility_ext) filtered on "king" in the county field sdh_tot10yr (utility_ext) filtered on "king" in the county field KCWPHA_1yr (utility) filtered on "HG" in the WHPA field sole_source (attached in this e-mail) Sole aquifer data from EPA is in SDW.

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 12-Dec-2005 (process 1 of 3)
    King County's existing CARA designation was adopted with the Critical Areas Ordinance in 2004. These designations are derived from existing susceptibility mapping based on data developed during the Groundwater Management Planning process in 1995 and new susceptibility mapping completed for Vashon - Maury Island in 2003.

    Date: unknown (process 2 of 3)
    From 2005 to 2008, King County Department of Natural Resources and Parks (DNRP) has contracted with GeoMapNW pursuant to an Interlocal partnership with the cities of Redmond, Woodinville and Issaquah, and the Sammamish Plateau Water and Sewer District, to remap geologic susceptibility in three new areas that are included in the proposed 2008 CARA update: Upper Issaquah Creek Valley, Redmond to Woodinville to Bear Creek Preston / High Point

    Date: 15-Oct-2008 (process 3 of 3)
    Ordinance16267 was passed October 15, 2008 adopting the revised CARA map in Section 48, page 184 and revised CARA definition in sections 49 and 50, page 184 - 191. <> The revised CARA map adopted as attachment A to ordinance16267 passed October 15, 2008. <>

  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?

    This dataset covers all of King County with the exception of incorporated areas (incorporated as of November 3, 2004).

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

    Dataset meets standard coverage QA/QC checks such as labelerrors, nodeerrors.

How can someone get a copy of the data set?

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

Access_Constraints: None
King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County. The King County susceptibility layer was based on best information available to the County and best judgment of the persons interpreting that information for the County at the point in time when it was collected and analyzed. The actual susceptibility of any area may differ from the representation found on the King County susceptibility layer. Data users should recognize this limitation and make provisions to consider other interpretations in the data in their planning and regulatory processes.

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

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 700
    Seattle, WA 98104

    206-263-5220 (voice)

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


  3. What legal disclaimers am I supposed to read?

    King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 07-Dec-2012
Metadata author:
King County Dept. of Natural Resources and Parks, Water and Lands Resources Division
Attn: Ken Rauscher
Senior GIS Analyst
201 S Jackson St, Suite 706
Seattle, WA 98104

206-296-1922 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Tue Apr 16 09:39:25 2024