Metadata: Identification_Information: Citation: Citation_Information: Originator: Clawges, Rick Originator: Price, Curtis Publication_Date: 1999 Title: Ground-water regions of the conterminous United States with unconsolidated watercourses Edition: 1.0 Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Rapid City, SD Publisher: U.S. Geological Survey Series_Information: Series_Name: Open-File Report Issue_Identification: 99-77 Online_Linkage: http://water.usgs.gov/lookup/getspatial?ofr99-77_gwreguw Description: Abstract: This data set describes ground-water regions in the United States defined by the U.S. Geological Survey. These ground-water regions are useful for dividing the United States into areas of roughly similar hydrologic characterstics and water-use patterns. Most of these regions are very generalized and were developed from a illustration published at a scale of approximately 1:20 million. The data set also includes polygon features for unconsolidated watercourses taken from 1:7,500,000-scale U.S. Geological Survey map of productive aquifers. Purpose: This data set is a generalized representation of ground-water areas in the United States and was created for use in the analysis of ground-water quality data on volatile organic compounds (VOCs) by the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) VOC National Synthesis Team. Polygons from this data set were used with common ranges of hydraulic characteristics provided in the Entity_and_Attribute_Overview below to relate ground-water resources with NAWQA study areas on a broad scale. Supplemental_Information: One source map for this data set is figure 12, from p. 17 of Heath (1984). Another source map for this data set is a map of productive aquifers from the U.S. Geological Survey National Atlas (U.S. Geological Survey, 1970), p. 122-123. The polygons representing unconsolidated watercourses on this map have been used to supplment the information from Heath (1984, figure 12, p .17). The same layer of information is presented (at a lower accuracy) by Heath (1984) (figure 13, p.18) as the "Alluvial Valleys" ground water region. Coastlines and political boundaries are modified from a digital version of U.S. Geological Survey 1:2,000,000 county boundaries (USGS, 1984). REVIEWS This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. Reviewers were given a paper copy of the map from p. 17 of Heath (1984) along with the digital data set to verify the linework and attributes. The reviewers checked the metadata and a_readme.1st files for completeness and accuracy. RELATED DATA SETS The data set GWREGION is similar to this data set (GWREGUW) but GWREGION only only includes information from Heath (1984) but does not include the aquifer inforamation from the from the National Atlas of the United States (USGS, 1970). REFERENCES Environmental Systems Research Institute, Inc. (ESRI), 1997, Arc/INFO 7.1.1 Help, Redlands, California, [on-line documentation]. Heath, R.C., 1984, Ground-Water Regions of the United States: U.S. Geological Survey Water-Supply Paper 2242, 78 p. Lanfear, K.J., 1984, Digital map of counties and county equivalents in the conterminous United States: U.S. Geological Survey data available on the World Wide Web, accessed July 21, 1998, at URL http://water.usgs.gov/lookup/getspatial?county2m U.S. Geological Survey, 1970, The National Atlas of the United States of America, Washington, D.C., 417 p. NOTES The accuracy of this data set is extremely limited. No map projection or registration points were included in the primary source map in (figure 12 from Heath (1984)). The map projection appeared to be Albers Conical Equal Area, so an Albers-projected data set of U.S. states was used to define registration points between a scanned image of the figure and the state boundary linework. The map projection for the map containing unconsolidated watercourses from U.S. Geological Survey (1970) is Albers Conical Equal Area. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1984, 1965 Currentness_Reference: The data is based on the map in Heath's report published in 1984, and the map from U.S. Geological Survey (1970), which was compiled in 1965. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -127.84205584 East_Bounding_Coordinate: -65.40873623 North_Bounding_Coordinate: 48.1924194 South_Bounding_Coordinate: 23.25354341 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: ground water Theme_Keyword: region Theme_Keyword: aquifer Place: Place_Keyword_Thesaurus: None Place_Keyword: Conterminous 48 United States Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Curtis V. Price Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: 1608 Mountain View Rd City: Rapid City State_or_Province: South Dakota Postal_Code: 57702 Country: United States of America Contact_Voice_Telephone: (605) 355-4560 Contact_Facsimile_Telephone: (605) 355-4523 Contact_Electronic_Mail_Address: cprice@usgs.gov Contact_Instructions: none Data_Set_Credit: Compilation of the data sets was supported by the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey. The objectives of the NAWQA Program are to: (1) describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers, (2) describe how water quality is changing over time, and (3) improve the understanding of the primary natural and anthropogenic factors that affect water-quality conditions. National analysis of data, based on aggregation of comparable information obtained from across the United States, is a major component of the NAWQA Program. These data sets were created in support of NAWQA national data analysis activities. Security_Information: Security_Classification_System: Public Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Operating System: dgux, 5.4R3.10, AviioN UNIX, ARC/INFO version 7.1.1 Cross_Reference: Citation_Information: Originator: Clawges, Rick and Price, Curtis Publication_Date: 1998 Title: Ground-water regions of the conterminous United States Edition: 1.0 Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Rapid City, SD Publisher: U.S. Geological Survey Online_Linkage: http://water.usgs.gov/lookup/getspatial?ofr99-77_gwregion Larger_Work_Citation Citation_Information: Originator: Clawges, Rick and Price, Curtis Publication_Date: 1999 Title: Digital data sets describing principal aquifers, surficial geology, and ground-water regions of the conterminous United States Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 99-77 Publication_Information: Publication_Place: Rapid City, SD Publisher: U.S. Geological Survey Online_Linkage: http://water.usgs.gov/pubs/ofr/ofr99-77/index.html Data_Quality_Information: Logical_Consistency_Report: Polygon and chain-node topology present. Completeness_Report: This data set includes all of the ground-water region boundaries presented on figure 12 on p. 17 of Heath (1984), plus boundaries for unconsolidated watercourses taken from p. 122-123 of U.S. Geological Survey (1970). Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: No tests performed, except a visual check to see how well the data set lines corresponded to those on the paper map. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: No tests performed, except a visual check to see how well the data set lines corresponded to those on the paper map. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Ralph C. Heath Publication_Date: 1984 Title: Ground-Water Regions of the United States Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: USGS Water Supply Paper Issue_Identification: 2242 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 20000000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1984 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: none Source_Contribution: Ground-water region polygon boundaries from Fig. 12 on page 17 of the report. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1970 Title: The National Atlas of the United States of America Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Washington, D.C. Publisher: U.S. Geological Survey Source_Scale_Denominator: 7500000 Type_of_Source_Media: mylar Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1970 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: none Source_Contribution: Alluvial valleys from aquifer map p. 122-123 Source_Information: Source_Citation: Citation_Information: Originator: Lanfear, K.J. Publication_Date: 19840816 Title: Counties and county equivalents in the conterminous United States Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Reston, Virginia, USA Publisher: U.S. Geological Survey Online_Linkage: http://water.usgs.gov/lookup/getspatial?county2m Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19840816 Source_Currentness_Reference: as of 1983 Source_Citation_Abbreviation: county2m Source_Contribution: US boundary and coastlines Process_Step: Process_Description: The source map was scanned to produce an image file. ARC/INFO software and commands (Environmental Systems Research Institute, Inc., 1997) were used to convert the image file to a coverage. ARC/INFO commands and modules are shown below in capitals. Step 1. Converted image to a grid using IMAGEGRID command. Step 2. Used GRID functions to select only grid cells corresponding to ground-water region boundary lines. This was done using geometric functions. Step 3. Raster to vector conversion using GRIDLINE command. Step 4. Edited line coverage using ARCEDIT module. Removed dangles, and added and deleted arcs. Step 5. Transformed coordinate data from inches to Albers Conical Equal Area, North American Datum of 1927 (NAD27) using TRANSFORM command. CONTROLPOINTS command was used to register points on the image to points on the coverage /home/vocgis/lib/pol/stategen. Details of CONTROLPOINTS: >Scale (X,Y) = (683001.735,672871.472) Skew (degrees) = (-0.139) >Rotation (degrees) = (-0.627) Translation = (-2725624.058,9074340.876) >RMS Error (input,output) = (0.033,22644.965) Added United States boundary using coverage /home/vocgis/lib/pol/stategen, which is a generalized version of county2m coverage. Step 6. Used CLEAN to build polygon topology. Used fuzzy tolerance of 1.0 and dangle length of 0. Step 7. Added attribute features to polygons. Process date: 19970606 Step 8. Polygon features representing unconsolidated watercourses from the coverage AQUIF75M were RESELECTed into a separate coverage. The IDENTITY command was used to overlay the GWREGION polygons with the watercourse polygons to produce GWREGUW. Source map from Heath was scanned to produce an image file. Process_Date: 19970606 Process_Step: Process_Description: Step 9. Used UNSPLIT in Arcedit to remove unnecessary pseudo nodes. Step 10. Rebuild topolgy Step 11. Copied coverage from DOUBLE to SINGLE precision and CLEANed. Used fuzzy tolerance of 1.0 and dangle length of 0. Process_Date: 19981028 Process_Step: Process_Description: Step 12. GENERALIZEd coverage with a weed tolerance of 100 meters using the point remove method for line generalization. Step 13. CLEANed coverage with a dangle length = 0 and a fuzzy tolerance of 1.0. Step 14. ELIMINATEd polygons with an area less than 10,000 sq. meters and fixed resulting labelerrors in Arcedit. Step 15. Rebuilt topology. Step 16. Used RENODE to sequentially number nodes. Process_Date: 19981028 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 793 SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 1816 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 794 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Albers Conical Equal Area Albers_Conical_Equal_Area: Standard_Parallel: 29.5 Standard_Parallel: 45.5 Longitude_of_Central_Meridian: -96 Latitude_of_Projection_Origin: 23 False_Easting: 0.00000 False_Northing: 0.00000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 Planar_Distance_Units: METERS Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: There are two attribute files associated with this data set. An arc attribute table: >DATAFILE NAME: GWREGION.AAT >8 ITEMS: STARTING IN POSITION 1 > COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME >01 FNODE# 4 5 B - >05 TNODE# 4 5 B - >09 LPOLY# 4 5 B - >13 RPOLY# 4 5 B - >17 LENGTH 8 18 F 5 >25 GWREGUW# 4 5 B - >29 GWREGUW-ID 4 5 B - >33 USBND 1 1 I - FNODE# is the internal number of the from-node TNODE# is the internal number of the to-node LPOLY# is the internal number of the polygon to the left of the arc RPOLY# is the internal number of the polygon to the right of the arc LENGTH is the length of the arc in meters GWREGUW# is a program-generated feature identity number GWREGUW-ID is a user-assigned feature identity number USBND is an item used to indicate if the arc is on the boundary of the United States. Arcs representing the United States boundary are flagged USBND = 1, others are coded USBND = 0. There also is a polygon attribute table associated with this data set: >DATAFILE NAME: GWREGUW.PAT >6 ITEMS: STARTING IN POSITION 1 >COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME >01 AREA 8 18 F 5 >09 PERIMETER 8 18 F 5 >17 GWREGUW# 4 5 B - >21 GWREGUW-ID 4 5 B - >25 CODE 2 2 I - >27 DESC 40 40 C - AREA is the area of the polygon in square meters PERIMETER is the perimeter of the polygon in meters GWREGUW# is a program-generated feature identity number GWREGUW-ID is a user-assigned feature identity number CODE is the region number with values as shown in the table from Heath (below). A CODE of 99 has been added for water areas. DESC is the region name from the same table. "WATER" in this item indicates a water body. Heath (1984) also designates ground water regions 13 (Hawaiian islands), 14 (Alaska), and (15) Puerto Rico/Virgin Islands. These areas are not included in this data set. A modified version of Table 6 from p. 19 of Heath (1984) is provided below. This table contains common ranges on the hydraulic characteristics of ground-water regions of the United States. >Region >number Region name Geologic situation >----------------------------------------------------------------------------------- > > 1 Western mountain ranges.............Mountains with thin soils over > fractured rocks, alternating with > narrow alluvial, and, in part, > glaciated valleys > 2 Alluvial basins.....................Thick (an average thickness of about > 5m was used as the breakpoint between > thick and thin) alluvial (locally > glacial) deposits in basins and > valleys bordered by mountains > 3 Columbia lava plateau...............Thick sequence of lava flows inter- > bedded with unconsolidated deposits > and overlain by thin soils > 4 Colorado plateau and Wyoming basin..Thin (an average thickness of about > 5m was used as the breakpoint between > thick and thin) soils over fractured > sedimentary rocks > 5 High Plains.........................Thick alluvial deposits over frac- > tured sedimentary rocks > 6 Nonglaciated central region.........Thin regolith over fractured sedi- > mentary rocks > 7 Glaciated central region............Thick glacial deposits over fractured > sedimentary rocks > 8 Piedmont and Blue Ridge.............Thick regolith over fractured crystal- > line and metamorphosed sedimentary > rocks > 9 Northeast and Superior uplands......Thick glacial deposits over fractured > crystalline rocks >10 Atlantic and Gulf Coastal Plain.....Complexly interbedded sands, silts, > and clays >11 Southeast Coastal Plain.............Thick layers of sand and clay over > semiconsolidated carbonate rocks >12 Alluvial Valleys....................Thick sand and gravel deposits beneath > flood plains and terraces of streams > > Transmissivity Hydraulic cond. Recharge rate Well yield >Reg. sq. m / day m / day mm / yr cub. m / min >------------------------------------------------------------------------------- >1 - 100 0.0003 - 15 3 - 50 0.04 - 0.4 >2 20 - 20,000 30 - 600 0.03 - 30 0.4 - 20 >3 2,000 - 500,000 200 - 3,000 5 - 300 0.4 - 80 >4 0.5 - 100 0.003 - 2 0.3 - 50 0.04 - 2 >5 1,000 - 10,000 30 - 300 5 - 80 0.4 - 10 >6 300 - 10,000 3 - 300 5 - 500 0.4 - 20 >7 100 - 2,000 2 - 300 5 - 300 0.2 - 2 >8 9 - 200 0.001 - 1 30 - 300 0.2 - 2 >9 50 - 500 2 - 30 30 - 300 0.1 - 1 >10 500 - 10,000 3 - 100 50 - 500 0.4 - 20 >11 1,000 - 100,000 30 - 3,000 30 - 500 4 - 80 >12 200 - 50,000 30 - 2,000 50 - 500 0.4 - 20 Abbreviations: >Reg. - Ground water region number >cond. - conductivity >sq. - square >m - meter >mm - millimeter >yr - year >cub. - cubic >min - minute Entity_and_Attribute_Detail_Citation: None Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Water Webserver Team Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing address Address: 12201 Sunrise Valley Drive, MS 440 City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Electronic_Mail_Address: h2oteam@qvarsx.er.usgs.gov Contact_Voice_Telephone: 1-800-426-9000 Contact_Instructions: Contact via email Distribution_Liability: Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Branch of Information Services Contact_Organization: U.S. Geological Survey Contact_Position: Branch of Information Services Contact_Address: Address_Type: mailing address Address: Box 25286 City: Denver Federal Center State_or_Province: Colorado Postal_Code: 80225-0286 Country: United States of America Contact_Voice_Telephone: (303)202-4210 Hours_of_Service: 8 AM to 4 PM Mountain Time Zone, Monday through Friday Distribution_Liability: Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Resource_Description: CD-ROM Metadata_Reference_Information: Metadata_Date: 19980421 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Rick Clawges and Curtis Price Contact_Organization: USGS NAWQA VOC National Synthesis Contact_Address: Address_Type: Mailing address Address: 1608 Mountain View Rd City: Rapid City State_or_Province: SD Postal_Code: 57702 Country: USA Contact_Electronic_Mail_Address: rclawges@usgs.gov, cprice@usgs.gov Contact_Voice_Telephone: 605 355-4560 Contact_Instructions: Contact via email Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998