Clawges, Rick Price, Curtis 1999 1.0 map Open-File Report 99-77 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-77_gwregion 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. These regions are very generalized and were developed from a illustration published at a scale of approximately 1:20 million. 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. One source map for this data set is figure 12, from p. 17 of Heath (1984). Coastlines and political boundaries are modified from a digital version of U.S. Geological Survey 1:2,000,000 county boundaries (USGS, 1984). REVIEWS APPLIED TO DATA 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 SPATIAL AND TABULAR DATA SETS The data set GWREGUW is similar to this data set (GWREGION) but also contains polygons for unconsolidated watercourses taken from the AQUIF75M data set from the National Atlas of the United States (U.S. Geological Survey, 1970). REFERENCES CITED 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., U.S. Government Printing Office, 417 p. NOTES The accuracy of this data set is extremely limited. No map projection or registration points were included in the source map (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. 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. 1984 The data is based on the map in Heath's report published in 1984. Complete None planned. -127.84205584 -65.40873623 48.1924194 23.25354341 None ground water region aquifer inlandWaters None Conterminous 48 United States None None Curtis V. Price U.S. Geological Survey Physical Scientist mailing address

1608 Mountain View Rd

Rapid City South Dakota 57702 United States of America 1-888-275-8747 (605) 355-4523 cprice@usgs.gov none 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. Public Unclassified None Operating System: dgux, 5.4R3.10, AviioN UNIX, ARC/INFO version 7.1.1 Clawges, Rick, and Price, Curtis 1998 1.0 map Rapid City, SD U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-77_gwregion Clawges, Rick and Price, Curtis 1999 1.0 Open-File Report 99-77 Rapid City, SD U.S. Geological Survey http://pubs.usgs.gov/of/1999/ofr99-77/ Polygon and chain-node topology present. This data set includes all of the ground-water region boundaries presented on Figure 12 on p. 17 of Heath (1984). No tests performed, except a visual check to see how well the data set lines corresponded to those on the paper map. Ralph C. Heath 1984 map USGS Water Supply Paper 2242 Reston, VA U.S. Geological Survey 20000000 paper 1984 publication date none Ground-water region polygon boundaries from Fig. 12 on page 17 of the report. Lanfear, K.J. 19840816 map Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?county2m online 19840816 as of 1983 county2m US boundary and coastlines 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 boundaries. 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, 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. 19970606 Step 8. GENERALIZEd coverage with a weed tolerance of 1000 meters using the POITREMOVE method for line generalization. Rebuilt topology. 19981026 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. Step 12. Used RENODE to sequentially number nodes. 19981028 Vector Point 34 String 78 GT-polygon composed of chains 35 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 1.0 1.0 METERS North American Datum of 1927 Clarke 1866 6378206.4 294.98 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 GWREGION# 4 5 B - >29 GWREGION-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 GWREGION# is a program-generated feature identity number GWREGION-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: GWREGION.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 GWREGION# 4 5 B - >21 GWREGION-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 GWREGION# is a program-generated feature identity number GWREGION-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 12 (alluvial valleys), 13 (Hawaiian islands), 14 (Alaska), and (15) Puerto Rico/Virgin Islands. These areas are not included in this data set, however, alluvial valleys is included in the data set "gwreguw", which is provided on this CD. 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 > > > 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 Abbreviations: >Reg. - Ground water region number >cond. - conductivity >sq. - square >m - meter >mm - millimeter >yr - year >cub. - cubic >min - minute None U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-77_gwregion.e00.gz DLG Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-77_gwregion.dlg.tgz SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-77_gwregion.sdts.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr99-77_gwregion FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998