Hitt, K.J. Nakagaki, N. 20060131 6.1 Vector digital data Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nawqacyc1 This is a coverage of the boundaries and codes used for the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program Study-Unit investigations in the conterminous United States, excluding the High Plains Regional Ground-Water Study. The data set represents the areas studied during the first decade of the NAWQA Program, from 1991-2001 ("cycle 1"). The National Water-Quality Assessment Program is a primary source for long-term, nationwide information on the quality of streams, ground water, and aquatic ecosystems (Gilliom and others, 2001). The goals of NAWQA are to assess the status and trends in the quality of the Nation's ground- and surface-water resources and to provide a sound understanding of the natural and human factors that affect the quality of these resources (Leahy and others, 1990). Study Units are defined by major river basins and aquifers across the Nation (Gilliom and others, 2001). This coverage contains the boundaries for the Study Units within the conterminous United States (excluding the High Plains Regional Ground Water-Study) that were defined during cycle 1 of NAWQA. During cycle 1 of NAWQA, 51 studies actually were undertaken (49 in the conterminous U.S. and one each in Alaska and Hawaii), and 8 were not scheduled. This coverage depicts 57 Study Units: 49 actually studied and 8 not scheduled. The coverage also includes the name, starting date, and NAWQA standard abbreviation of each Study Unit plus various codes to help display the data. The second cycle of NAWQA (2001-2012) will adjust its scope to 42 of these important river basins and aquifer systems to accommodate budget reductions. The second cycle of investigations began in 14 Study Units in 2001. Although the boundaries of most Study Units remain the same in cycle 2, the boundaries and codes for cycle 2 Study Units are maintained in a separate data set (NAWQACYC2). This data set is used primarily to display the location of NAWQA Study Units and for analysis of data at the national scale. It is not recommended for either local or regional analysis due to the small scale of most of the features. Originally, Study-Unit boundaries in this coverage were composed of 1:2,000,000-scale hydrologic unit boundaries (Allord, 1992) and state boundaries (Negri, 1994). As the NAWQA project progressed and Study-Unit Investigations got underway, many Study-Unit boundaries were modified. In addition, Study Units enhanced their boundary coverages with features at higher resolutions. As these modifications were made, Study Units submitted their new boundary coverages to National Synthesis teams, who are responsible for summarizing the results from all of the Study Units, and the changes were incorporated into this coverage. As a result, this coverage is composed of linear features at various scales (for example, 1:100,000, 1:250,000), but the majority remain at the 1:2,000,000 scale. The original version of this coverage was generated by the USGS Cartographic and Publishing Program (CAPP) in Madison, Wisconsin, in the fall of 1991. The procedures used to create this coverage are described below. Each NAWQA Study Unit was asked for a description of their boundary definition. Once this information was gathered, CAPP created the coverage by extracting digital features from the 1:2,000,000 Hydrologic Unit boundaries coverage and the 1:2,000,000 state boundaries coverage. Since the majority of Study-Unit boundaries are defined from hydrologic unit boundaries, most of the features were directly copied from the Hydrologic Units coverage. An exception to this was the boundary defining the Georgia-Florida Coastal Plain Study Unit where the northern boundary was defined by the northern edge of the Floridan Aquifer. To incorporate this boundary into the coverage, the aquifer boundary was digitized from the U.S. Geological Survey's "Ground-Water Atlas of the United States", HA-730 (G) (Miller, 1990). In November 1991, responsibility for maintaining the coverage was transferred to NAWQA's National Synthesis staff. Major milestones in the development of the coverage and various revisions to the coverage are listed under the Lineage section. The coverage is reviewed by one of the NAWQA National Synthesis GIS staff members prior to release. Alaska (Cook Inlet) and Hawaii (Oahu) NAWQA Study-Unit boundaries are maintained in separate data sets. The High Plains Regional Ground-Water Study boundary is in a separate data set. Cook, Oahu, and High Plains study boundaries should be used with this data set to give the full picture of NAWQA Study Units nationwide. References Allord, G.J., 1992, 1:2,000,000 Hydrologic Unit map of the conterminous United States, Version 1.1.2. Available through the internet at http://water.usgs.gov/lookup/getspatial?huc2m. Gilliom, R.J., Alley, W.M., and Gurtz, M.E., 1995, Design of the National Water-Quality Assessment Program--Occurrence and distribution of water-quality conditions: U.S. Geological Survey Circular 1112, U.S. Geological Survey, Sacramento, California, 33 p. Available through the internet at http://water.usgs.gov/pubs/circ/circ1112/. Gilliom, R.J., Hamilton, P.A., and Miller, T.L., 2001, The National Water-Quality Assessment Program--Entering a new decade of investigations: U.S. Geological Survey Fact Sheet 071-01. Available through the internet at http://water.usgs.gov/pubs/FS/fs-071-01/pdf/fs07101.pdf. Hamilton, P.A., Miller, T.L., and Myers, D.N., 2004, Water Quality in the Nation's Streams and Aquifers--Overview of Selected Findings, 1991-2001: U.S. Geological Survey Circular 1265, 20 p. Available through the internet at http://pubs.usgs.gov/circ/2004/1265/. Leahy, P.P., Rosenshein, J.S., and Knopman, D.S., 1990, Implementation plan for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 90-174. U.S. Geological Survey, Reston, Virginia, 10 p. Leahy, P.P. and Thompson, T.H., 1994, National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 94-70, 4 p. Available through the internet at http://water.usgs.gov/nawqa/NAWQA.OFR94-70.html. Miller, James A., 1990, Ground water atlas of the United States-Segment 6, Alabama, Florida, Georgia, and South Carolina: U.S. Geological Survey Hydrologic Atlas Hydrologic Investigations Atlas-730-G, 28 p. Information about the Ground Water Atlas is available at http://capp.water.usgs.gov/gwa/index.html. Nebert, Douglas D. and Steeves, P.A., 1994, Digital map file of hydrologic unit boundaries for the conterminous United States processed from 1:100,000- and 1:250,000-scale U.S. Geological Survey Geographic Information Retrieval and Analysis System (GIRAS) data files. U.S. Geological Survey Open File Report 94-326. Available on the internet through http://water.usgs.gov/lookup/getspatial?huc250k. Negri, M., 1994, 1:2,000,000 Digital map of state boundaries of the conterminous United States. Available through the internet at http://water.usgs.gov/lookup/getspatial?states2m. 2001 Current as of publication date. Complete This data set represents the final version of cycle 1 study unit boundaries that existed at the end of the first decade of study. The coverage underwent many changes over the years and was updated whenever the Study-Unit boundaries changed or were refined. The changes fell into these broad categories: 1) the Study-Unit boundaries changed as the geographic definition of the boundary changed (features were added or deleted); 2) the digital boundaries were refined by acquiring more detailed source materials; and 3) changes in the NAWQA program necessitated revamping of the Study-Unit definitions. Where a revised Study-Unit boundary was shared with another Study Unit, in general, a higher resolution boundary took precedence over a lower resolution boundary and the more recent version of a boundary took precedence over the older version of that boundary. -127.872474 -65.356310 51.601234 22.877918 None National Water-Quality Assessment Program NAWQA Water quality Surface water Ground water River basin Aquifer system inlandWaters None Conterminous United States None None None 1991-2001 None. Accuracy is good at 1:2,000,000 or smaller in most cases. The Study-Unit source maps come from various sources and scales. Kerie J. Hitt U.S. Geological Survey mailing address

12201 Sunrise Valley Drive, MS-413

Reston VA 20192 USA 1-888-275-8747 703-648-6693 kjhitt@usgs.gov 9:00am-5:30pm EST Please contact through email http://water.usgs.gov/nawqa/map/cyc1_browse.gif This is an image of a national map showing the cycle 1 NAWQA Study Unit boundaries. GIF Microsoft Windows XP Version 5.1 (Build 2600 Service Pack 1); ARC/INFO version 9.0 Hitt, K.J. Nakagaki, N. 20060131 1 Vector digital data Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nawqacyc2 Hitt, K.J. 20060131 1.1 Vector digital data Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nawqagencyc1 Hitt, K.J. 20060131 1.0 Vector digital data Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nawqagencyc2 See Entity_Attribute_Information See Explanation Where present, is described with each attribute defined in the Entity and Attribute Section. The data set was checked for topological consistency using the Arc/INFO commands BUILD and LABELERRORS. The data set contains NAWQA boundaries (excluding HPGW) for the conterminous United States. Allord, G.J. 1992 1.1.2 digital data Madison, WI U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?huc2m 2000000 digital files 1991 publication date HUC2M This layer provided 1:2,000,000 hydrologic unit boundaries that served as an initial source of the NAWQA Study Unit boundaries. Miller, James A. 1990 1.0 digital data Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ha/ha730/ 2500000 scale stable map 1990 publication date HA 730G This layer provided the northern edge of the Floridan Aquifer, which formed part of the boundary of the Georgia-Florida Coastal Plain NAWQA. Nebert, Douglas D. Steeves, P.A. 1994 1 digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?huc250k 250000 digital file 1994 publication date HUC250k This layer contributed some higher resolution hydrologic unit boundaries. Negri, M. 1994 1 digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?states2m 2000000 digital file 1994 publication date States2m This layer contributed state boundaries. Version 1.0 - Received NAWQA coverage from Greg Allord, Madison, WI. 19911125 Version 1.1 - Added item USBND to .AAT for plotting purposes only. 19911127 Version 1.2 - Updated three Study-Unit boundaries: 1) Modified Red River of the North to include portion in Canada. A file containing latitude/longitude coordinates was used in determining the new northern boundary. 2) Replaced Ozark Plateau Study Unit with exported coverage from Ozark Plateau Study Unit staff. 3) Excluded the area that defines HUC 02030102 from Hudson River Basin Study Unit. 19911217 Version 1.3 - Updated two Study-Unit boundaries: 1) Updated Apalachicola-Chattahoochee-Flint Basin with an exported coverage from ACFB Study Unit. (Source scale: 1:250,000.) 2) Modified Nevada Basin and Range (southern portion) to exclude most of eastern area defined by HUC 15010005. 19920113 Version 1.4 - Added item CANADA to .AAT and to .PAT for plotting purposes only. 19920131 Version 1.5 - Updated Study-Unit boundaries: 1) Updated Lower Susquehanna Study-Unit boundary. It now includes portion of the area defined by HUC 02060002. 2) Modified northeast section of the Willamette Study Unit with an exported coverage from Willamette Study Unit. 3) Replaced Apalachicola-Chattahoochee-Flint Basin boundary with an exported coverage. 4) Modified labels for Long Island and New Jersey Coastal Plain Study Unit. 19920204 Version 1.6 - Replaced Ozark Plateau Study-Unit boundary with an exported coverage. 19920205 Version 1.7 - Modified two Study-Unit boundaries: 1) Eliminated area defined by HUC 05120209 from White River Basin Study Unit. 2) Replaced Central Oklahoma Study-Unit boundary with an exported coverage from Central Oklahoma Study Unit. 19920211 Version 1.8 - Replaced Ozark Plateau Study-Unit boundary with an exported coverage. 19920403 Version 1.9 - Deleted HUC 18040003 from San Joaquin-Tulare Basin Study Unit. 19920923 Version 2.0 - Various changes to Study-Unit boundaries have been incorporated into the coverage. 19931122 Version 3.0 - Study Units supplied new boundaries for Southern Florida, Great Salt Lake, Upper Colorado, and Sacramento. Name of Puget Sound Basin and Lower Illinois River Basin Study Units were changed. 19940623 Version 3.1 - HUCs 06020001, 06020002, 06020003 were added to the Upper Tennessee River Basin Study Unit. We used the 1:2,000,000 HUC boundaries except where they coincided with the Apalachicola-Chattahoochee-Flint Basin. Along the ACFB, we used the ACFB boundary originally in the coverage. 19940802 Version 3.2 - The entire Lower Susquehanna Study-Unit boundary was replaced by a coverage supplied by Steve Siwiec. (The most noticeable change occurred in the southeastern corner of the Study Unit.) As a result, the boundaries for the adjacent Study Units adjacent (Potomac, Allegheny-Monongahela and Delaware River) were slightly modified. 19940929 Version 3.3 - Expanded Lake Erie-Lake St. Clair to include HUCs 4090001-5 and 4120101-3 per Dennis Finnegan. 19941221 Version 3.3 - Expanded South Central Texas to include surface water drainage to the coast using coverage from Jim Bisese. 19950321 Version 3.3 - Minor change to Central Arizona Basins boundary. New boundary from Julie Rees. 19950519 Version 3.3 - Replaced San Joaquin-Tulare Study-Unit boundary with a coverage provided by JoAnn Gronberg and the Sacramento Study-Unit boundary with a coverage from Donna Knifong. The portion of the boundary shared with Nevada Basin and Range was NOT replaced. The difference between the new boundaries and the old boundaries is very small. The new boundaries are at the 1:250,000-scale. Part of the Sacramento Delta was modified to match the Sacramento Study-Unit boundary. 19950720 Version 3.3 - Changed abbreviation for Northern New England Basins from NHME to NNEB. 19950720 Version 3.3 - Minor change to Allegheny-Monongahela Study-Unit boundary using enhanced boundary from Mary Mulkerrin. ALMN's boundary overrode Potomac's and Lower Susquehanna's western boundary. 19950720 Version 3.3 - Replaced Upper Tennessee and Lower Tennessee boundaries with coverage from Joe Connell. Lower Tennessee expanded out a little into Upper Tennessee. 19950720 Version 3.3 - Northwestern portion of Upper Mississippi has expanded out to Red River of the North. Paul Hanson provided a new Upper Mississippi boundary coverage for update. The boundary common with Red River of the North has been replaced with the new Upper Mississippi boundary. 19950801 Version 3.3 - Enhanced Red River of the North boundary (EXCEPT portion common with Upper Mississippi) with coverage from Dave Lorenz. 19950802 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Expanded former Chicot-Evangeline to include Lake Pontchartrain with coverage from John Lovelace. The new Study Unit is called Acadian-Pontchartrain and the abbreviation is ACAD. 19950914 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Expanded Mobile River and Tributaries with coverage from Darrell Lambet. 19950928 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Edited Great and Little Miami River Basins to remove parts not in Great/Little Miami river basins. Based mostly on 1:2,000,000 HUC boundaries. Added area containing Cincinnati (from north bank of Ohio river and beyond), using the 1:2,000,000 streams. Changes approved by Rod Sheets. 19951005 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Replaced Kentucky River Basin with 1:24,000 coverage from Robert Forbes. 19951006 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Expanded Yellowstone River Basin to include Bighorn River. 19951010 Version 4.0 - Changes arose during the effort to prioritize the FY 1997 Study Units. Removed Central Oklahoma and Central High Plains. Replaced them with two new areas: Middle Arkansas River Basin and Canadian-Cimarron River Basins. The new coverages were extracted mostly from the 1:250,000 HUC coverage. Part of the boundary came from an 11-digit HUC coverage. HUC 11060006050 was added to Canadian-Cimarron area and removed from Middle Arkansas so that all of the Keystone Reservoir was included in the Canadian-Cimarron. Original coverages were supplied by Jamie Schlottmann Norvell. The new boundaries replaced those of Rio Grande, Southern High Plains, Upper Arkansas, and Kansas where they were adjacent to the existing boundaries. 19951025 Version 4.1 - Northwestern portion of Mississippi Embayment boundary was expanded by adding HUC 7140107 and the western portion of HUC 11010014; Northern New England Basins and Southeastern New England Basins merged into one Study Unit - New England Coastal Basins (NECB), scheduled to begin in fiscal year 1997. 19960619 Version 4.2 - Northern Rockies Intermontane Basins, Great Salt Lake, Southern High Plains - all of which were originally '94 Study Units - have become '97 Study Units. Kentucky, Canadian-Cimarron, Upper Arkansas, Kansas, North Platte, and Cheyenne - all formerly '97 Study Units - no longer have a scheduled date. The latter set of Study Units are identified as GROUP 4 Study Units. 19960722 Version 4.3 - Item NAWQA was renumbered to reflect the merging of Northern New England Basins and Southeast New England Basins. 19960801 Version 4.4 - Minor revision to Upper Tennessee. The Study-Unit boundary was replaced with the basin boundary for station 03568000, which is the integrator site for the entire Upper Tennessee. Removed Lake Okeechobee from Southern Florida Study Unit, since no other lakes are delineated separately. 19961205 Version 4.5 - Replaced South Central Texas with enhanced boundary coverage from Lu Tan; replaced Connecticut with enhanced boundary coverage from Pete Steeves. 19970306 Version 4.6 - Expanded item NAME in .PAT from 40 characters to 50 characters so full Study-Unit names (with no abbreviations) could fit into this field. 19970516 Version 4.7 - Changed Delmarva and Yakima from group 3 to group 4 in accordance with email from Bill Wilber. 19970908 Version 5 - Incorporated new boundaries for UIRB and LIRB using coverages supplied by the Study Units. The LIRB boundary was higher resolution than the UIRB boundary, so the LIRB boundary had priority where the two shared a boundary. The WMIC boundary was replaced where it was coincident with UIRB. Changed Study-Unit starting dates to match recent programmatic changes within NAWQA. Group 4 = Planned to begin in FY 99 (DLMV, YAKI) Group 5 = Unscheduled (CHEY, KNTY, UARK) Group 6 = Unscheduled, overlap the High Plains study (CACI, KANS, MARK, NPLT, SHPL) Group 7 = CNBR (overlaps the High Plains study; now in a separate group to distinguish it from other FY 91 studies) Changed item CANADA to INTL. Changed item ABBV to SUID to be consistent with NAWQA data base network tables. 19980605 Version 5.1 - Replaced DELR boundary with one supplied by Paul Dunne. The boundary was extended to include the entire Christina River Basin. This change also affects the DLMV. 19980629 Version 5.2 - Replaced ALMN boundary with higher resolution boundary provided by James Sams III; also replaced MIAM boundary with enhanced boundary provided by Lori Mattern. 19980919 Version 5.3 - Small change to UMIS boundary provided by Paul Hanson. 19981204 Version 5.4 - Changes to boundaries of YELL (Ron Zelt), NROK (Deann Dutton), UIRB (Terri Arnold), DELR (Paul Dunne), 19990406 Version 5.5 - Changes to boundaries of SANA (Katherine Paybins). 19990623 Version 6.0 - CHANGED HORIZONTAL DATUM FROM NAD27 TO NAD83. 19990623 Version 6.1 - Changed back to 4 main NAWQA groups: group 1 (studied 1991-95), group 2 (studied 1994-98), group 3 (studied 1997-2001), and group 4 (not scheduled for study during cycle 1 of NAWQA). We no longer need to distinguish which Study Units overlap the High Plains. Removed items G5BND, G6BND, G7BND from arc attribute table. Added item ACTUALLY_STUDIED to polygon attribute table. Coded annotation $level to match Study Unit group. 20020510 Changed name of coverage from NAWQA to NAWQACYC1 to distinguish it from the coverage containing the NAWQA cycle 2 boundaries (NAWQACYC2). 20021121 Revised names to match those in USGS Fact Sheet 071-01. 20021122 Calculated cover-id equal to cover# - 1. Changed name of ACTUALLY_STUDIED to STUDIED. 20021206 Updated study unit names to match those published in USGS Circular 1265. (http://pubs.usgs.gov/circ/2004/1265/) Changed NAME field to be 62 characters. 20060127 Vector Complete chain 3421 Label point 1455 GT-polygon composed of chains 1455 Point 60 Label point 58 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 0.002334 0.002334 METERS North American Datum of 1983 GRS1980 6378137.000 298.257222 NAWQACYC1.AAT Arc Attribute Table NAWQA FNODE# Internal number of from-node Computed Positive real numbers that are automatically generated. TNODE# Internal number of to-node Computed Positive real numbers that are automatically generated. LPOLY# Internal number of polygon to left of arc Computed Positive real numbers that are automatically generated. RPOLY# Internal number of polygon to right of arc Computed Positive real numbers that are automatically generated. LENGTH Length of arc in coverage units Computed Positive real numbers that are automatically generated. NAWQACYC1# Internal feature number Computed Positive real numbers that are automatically generated. NAWQACYC1-ID User-assigned feature number User-defined Positive real numbers that are automatically generated. USBND Flag for US boundary NAWQA 1,0 1=US boundary; 0=not US boundary User assigned INTL Flag for arcs in Canada or Mexico NAWQA 1,0 1=Canada or Mexico arc; 0=U.S. arc User assigned G1BND Flag for group 1 boundaries NAWQA 1,0 1=group 1 boundary; 0=not group 1 boundary User assigned G2BND Flag for group 2 boundaries NAWQA 1,0 1=group 2 boundary; 0=not group 2 boundary User assigned G3BND Flag for group 3 boundaries NAWQA 1,0 1=group 3 boundary; 0=not group 3 boundary User assigned G4BND Flag for group 4 boundaries NAWQA 1,0 1=group 4 boundary; 0=not group 4 boundary User assigned SUBND Flag for Study-Unit boundaries NAWQA 1,0 1=Study-Unit boundary; 0=not Study-Unit boundary User assigned NAWQACYC1.PAT Polygon Attribute Table GIS software AREA Area of polygon in square coverage units (square meters) Computed Positive real numbers that are automatically generated. PERIMETER Perimeter of polygon in coverage units (meters) Computed Positive real numbers that are automatically generated. NAWQACYC1# Internal feature number Computed Positive real numbers that are automatically generated. NAWQACYC1-ID User-assigned feature number User-defined Integer n/a GIS software NAWQA Assigned NAWQA Study-Unit number NAWQA program 1-57, 0 Loosely based on WRD region. Values 1-57 are NAWQA Study Units. 0 is not a NAWQA Study Unit. User assigned NAME Name of Study-Unit NAWQA program NAWQA Study-Unit names See table 1. User assigned GROUP Code for starting date of Study Unit NAWQA program 1,2,3,4,0 1= studied 1991-95; 2= studied 1994-98; 3= studied 1997-2001; 4= Not scheduled; 0= Not a NAWQA Study Unit. User assigned PILOT Flag for Pilot study NAWQA program 1,0 1=pilot study; 0=not pilot study User assigned SUID 4-letter abbreviation for Study Unit NAWQA program See table 1. See Entity_and_Attribute_Overview User assigned INTL Flags polygons in Canada (REDN,PUGT,CONN) or Mexico (CAZB) NAWQA 1,0 1=in Canada or Mexico; 0=not in Canada or Mexico User assigned MI2 Area of polygon in square miles NAWQA Real numbers AREA * .0000003861 User assigned REGION USGS water-resources administrative region USGS N, S, C, W USGS Water Resources Division administrative region: N=northeastern; S=southeastern; C=central; W=western User assigned STUDIED Flag for whether NAWQA Study Unit was actually studied during Cycle 1 of NAWQA (1991-2001). USGS Y,N Flag for whether the Study Unit was actually studied or not during Cycle 1 of NAWQA. Y = was studied during Cycle 1 (that is, group = 1,2,3). N = was not studied during Cycle 1 (group = 4). Blank = was not a designated Study Unit (group = 0). User assigned There are two attribute files associated with this coverage. An arc attribute table (.AAT): >DATAFILE NAME: NAWQACYC1.AAT > 9 ITEMS: STARTING IN POSITION 1 > COL ITEM NAME WDTH OPUT TYP N.DEC > 01 FNODE# 4 5 B - > 05 TNODE# 4 5 B - > 09 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 4 12 F 3 > 21 NAWQACYC1# 4 5 B - > 25 NAWQACYC1-ID 4 5 B - > 29 USBND 1 1 I - > 30 INTL 1 1 I - > 31 SUBND 1 1 I - > 32 G1BND 1 1 I - > 33 G2BND 1 1 I - > 34 G3BND 1 1 I - > 35 G4BND 1 1 I - where: >arcs representing the boundary of the United States are flagged USBND = 1 >arcs representing Study-Unit boundaries in Canada or Mexico > are flagged INTL = 1 >arcs representing Study-Unit boundaries are flagged SUBND = 1 >arcs representing group 1 Study-Unit boundaries are flagged G1BND = 1 >arcs representing group 2 Study-Unit boundaries are flagged G2BND = 1 >arcs representing group 3 Study-Unit boundaries are flagged G3BND = 1 >arcs representing group 4 Study-Unit boundaries are flagged G4BND = 1 AND a polygon attribute table (.PAT): >DATAFILE NAME: NAWQACYC1.PAT >11 ITEMS: STARTING IN POSITION 1 >COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME > 01 AREA 4 12 F 3 > 05 PERIMETER 4 12 F 3 > 09 NAWQACYC1# 4 5 B - > 13 NAWQACYC1-ID 4 5 B - > 17 NAWQA 4 4 I - > 21 NAME 62 62 C - > 83 GROUP 2 2 I - > 85 PILOT 1 1 I - > 86 SUID 4 4 C - ABBV > 90 INTL 1 1 I - CANADA > 91 MI2 4 10 F 0 > 95 REGION 1 1 C - > 96 STUDIED 1 1 C - NAWQA is the Study-Unit number, which is a sequential number from 1-57. The numbers originally were based on administrative regions, but are not anymore. See table 1. NAME contains the full name of the Study Unit. See table 1. GROUP represents the assessment schedule of Study-Unit investigations: >Group 1 = Assessed during 1991-1995 >Group 2 = Assessed during 1994-1998. >Group 3 = Assessed during 1997-2001. (Includes DLMV and YAKI, > which started in 1999.) >Group 4 = Not scheduled for study during cycle 1. (KNTY, UARK, CHEY, CACI, NPLT, MARK, SHPL, KANS). PILOT flags those polygons that were pilot projects, although the boundaries of the pilot projects were not maintained in this coverage. (For example, COKL boundaries were replaced when CACI was delineated.) SUID contains the 4-letter abbreviation for the Study Unit. The alternate name is ABBV. See table 1. INTL flags those polygons located in Canada or Mexico. Usually polygons outside of the United States are NOT plotted on national displays of the boundaries. INTL is in both the .AAT and the .PAT and is used primarily for plotting purposes. (USBND, SUBND, G1BND, G2BND, G3BND, and G4BND are in the .AAT and are also used for plotting.) MI2 is the area of an individual polygon in square miles, calculated as MI2 = AREA * .0000003861. To find the area of an entire Study Unit, sum the areas of the individual polygons comprising the Study Unit. REGION is the USGS water resources administrative region: >N = Northeast >S = Southeast >C = Central >W = Western STUDIED is a flag for whether the Study Unit was actually studied during cycle 1 of NAWQA (1991-2001). >Y = actually studied during cycle 1 >N = not studied during cycle 1 >Blank = was not designated as a Study Unit during cycle 1 Table 1.--NAWQA 4-letter abbreviations (SUID), names (NAME), and numbers (NAWQA). > SUID NAME (NAWQA NUMBER) >ACAD Acadian-Pontchartrain Drainages (28) >ACFB Apalachicola-Chattahoochee-Flint River Basin (22) >ALBE Albemarle-Pamlico Drainage Basin (19) >ALMN Allegheny and Monongahela River Basins ( 9) >CACI Canadian-Cimarron River Basins (32) >CAZB Central Arizona Basins (49) >CCPT Central Columbia Plateau (50) >CHEY Cheyenne-Belle Fourche River Basins (42) >CNBR Central Nebraska Basins (35) >CONN Connecticut, Housatonic and Thames River Basins ( 2) >DELR Delaware River Basin ( 5) >DLMV Delmarva Peninsula ( 7) >EIWA Eastern Iowa Basins (30) >GAFL Georgia-Florida Coastal Plain (23) >GRSL Great Salt Lake Basins (47) >HDSN Hudson River Basin ( 3) >KANA Kanawha - New River Basins (10) >KANS Kansas River Basin (36) >KNTY Kentucky River Basin (25) >LERI Lake Erie - Lake Saint Clair Drainages (11) >LINJ Long Island - New Jersey Coastal Drainages ( 4) >LIRB Lower Illinois River Basin (15) >LSUS Lower Susquehanna River Basin ( 6) >LTEN Lower Tennessee River Basin (29) >MARK Middle Arkansas River Basin (38) >MIAM Great and Little Miami River Basins (12) >MISE Mississippi Embayment (27) >MOBL Mobile River Basin (26) >NECB New England Coastal Basins ( 1) >NPLT North Platte River Basin (41) >NROK Northern Rockies Intermontane Basins (46) >NVBR Las Vegas Valley Area and the Carson and Truckee River Basins (55) >OZRK Ozark Plateaus (31) >POTO Potomac River Basin ( 8) >PUGT Puget Sound Basin (52) >REDN Red River of the North Basin (18) >RIOG Rio Grande Valley (45) >SACR Sacramento River Basin (54) >SANA Santa Ana Basin (57) >SANJ San Joaquin-Tulare Basins (56) >SANT Santee River Basin and Coastal Drainages (21) >SCTX South-Central Texas (34) >SHPL Southern High Plains (39) >SOFL Southern Florida (24) >SPLT South Platte River Basin (40) >TRIN Trinity River Basin (33) >UARK Upper Arkansas River Basin (37) >UCOL Upper Colorado River Basin (44) >UIRB Upper Illinois River Basin (14) >UMIS Upper Mississippi River Basin (17) >USNK Upper Snake River Basin (48) >UTEN Upper Tennessee River Basin (20) >WHIT White River Basin (13) >WILL Willamette Basin (53) >WMIC Western Lake Michigan Drainages (16) >YAKI Yakima River Basin (51) >YELL Yellowstone River Basin (43) >----------------------------------------------------------------------- > Hawaii and Alaska (not included in this data set) >----------------------------------------------------------------------- > OAHU Island of Oahu (58) > COOK Cook Inlet Basin (59) >----------------------------------------------------------------------- > High Plains (not included in this data set) >----------------------------------------------------------------------- > HPGW High Plains Regional Ground Water Study -- The coverage also contains annotation showing the 4-letter Study-Unit abbreviations. Annotation codes: >$level = 1 (group 1 abbreviations) >$level = 2 (group 2 abbreviations) >$level = 3 (group 3 abbreviations) >$level = 4 (group 4 abbreviations) Not Available U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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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 Arc/INFO Export file zipped 1 http://water.usgs.gov/GIS/dsdl/nawqacyc1.e00.gz Shape Shape file zipped 1 http://water.usgs.gov/GIS/dsdl/nawqacyc1.tar.gz None. This dataset is provided by USGS as a public service. 20060130 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+nawqacyc1 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998