Naomi Nakagaki and Alice L. Zhou 201210 Version 2.0, October 2012 vector digital data Sacramento, CA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?warpbas2012 This data set contains 204 drainage basin boundaries for U.S. Geological Survey (USGS) stream sites analyzed in the Watershed Regressions for Pesticides (WARP) model. This dataset supercedes version 1.0 released in April 2010, and consists of revisions to 26 basin boundaries. These basin boundaries are used to characterize surface-water sampling sites in the current and future development of Watershed Regressions for Pesticides (WARP) models (Stone and Gilliom, 2009; Stone and others, 2008). PURPOSE REFERENCES: Stone, W.W. and Gilliom, R.J., 2009, Update of Watershed regressions for pesticides (WARP) for predicting atrazine concentration in streams: U.S. Geological Survey Open-File Report 2009-1122, 22 p., accessed March 9, 2010, at http://pubs.usgs.gov/of/2009/1122/ Stone, W.W., Gilliom, R.J., and Crawford, C.G., 2008, Watershed regressions for pesticides (WARP) for predicting annual maximum and maximum moving-average concentrations of atrazine in streams: U.S. Geological Survey Open-File Report 08-1186, 19 p., accessed March 9, 2010, at http://pubs.usgs.gov/of/2008/1186/ CONTENTS: The compressed file, warpbas2012.zip contains a folder named "shpf", which consists of 204 basin boundaries in shapefile format, and a comma-delimited tabular file, "warpbas2012_attributes.txt", which stores the name of the 204 shapefiles and attributes associated with the basins. BACKGROUND INFORMATION: This dataset is a collection of basin boundaries from USGS hydrologists and geographers from over 50 NAWQA study units from the mid 1990s through 2011. The scale or resolution of the delineations varies, and common boundaries shared by adjacent and nested basins are not entirely coincident. About two-thirds of the boundaries were developed from data sources at a scale of 1:24,000 or resolution of 30 meters. Generally, the larger basins were delineated at lower resolutions. The 204 basins range in size from 13 square kilometers to nearly 3,000,000 square kilometers. Collectively, the basins cover approximately 60 percent of the conterminous United States. A number of basins were extracted from existing USGS publications but are included in this data release to facilitate the acquisition of basin boundaries used for the WARP model. One-hundred-forty-three basins were published recently by Nakagaki and others (2012), which includes 20 basins from the National Stream Quality Accounting Network and National Monitoring Network Basin Boundary Geospatial Dataset, 2008-13 (Baker, 2011); two additional basins are from Baker (2011); two basins are part of U.S. Geological Survey National Stream Quality Accounting Network (NASQAN) sampling sites 1996-2000 (U.S Geological Survey, 2004); and one basin is from the Drainage Areas for Selected Stream-sampling Stations, Missouri River Basin (Godberson and others, 2006). BACKGROUND INFORMATION REFERENCES: Baker, N.T., 2011, National Stream Quality Accounting Network and National Monitoring Network Basin Boundary Geospatial Dataset, 2008-13: U.S. Geological Survey Data Series 641, 16 p., accessed December 7, 2011, at http://pubs.usgs.gov/ds/641/ Godberson, J.A., Zelt, R.B., and Zoller A.L., 2006, Drainage areas for selected stream-sampling stations, Missouri River Basin (ver. 1.2.1): U.S. Geological Survey digital vector data, accessed February 4, 2009 at http://water.usgs.gov/lookup/getspatial?ne-3071 Nakagaki, N., Baker, N.T., and Zhou, A.L., 2012, Drainage basins used for assessing trends in concentration of pesticides in streams of the United States, 1992-2010: U.S. Geological Survey digital vector data, accessed July 23, 2012, at http://water.usgs.gov/lookup/getspatial?ds655_basins U.S. Geological Survey, 2004, Watersheds for U.S. Geological Survey National Stream Quality Accounting Network (NASQAN) sampling sites 1996-2000 (ed. 1.0): U.S. Geological Survey digital vector data, accessed December 7, 2011, at http://water.usgs.gov/lookup/getspatial?nasqan2k REVISIONS TO VERSION 1 OF THE WARP BASIN BOUNDARIES, WARP2010: The basin boundaries used for the WARP model were initially released in 2010. Since this release, 26 boundaries have been enhanced. The differences in area range from less than a square kilometer to over 33,700 square kilometers, but with percent differences that are less than three for 24 of the 26 basins. The remaining two basins, 08475000, Rio Grande near Brownsville, TX and 09153290, Reed Wash near Mack, CO, have percent differences of approximately 6 and 13, respectively. NAMING CONVENTIONS OF BASIN DATA: Each basin is stored as a separate shapefile, and is identified by "b" concatenated with the USGS site-identification number (STAID), followed by .shp. DOCUMENTATION There is a metadata file with each basin shapefile in xml and text format. The documentation indicates the source and methods used to delineate the basins. TYPE OF DRAINAGE AREAS: A contributing drainage area can be defined as the area from which water drains to a single point along a stream. For a majority of the WARP basins, the basin delineation represents the contributing drainage area. A total drainage area which includes noncontributing drainage areas, such as sinks, potholes, or areas that only drain into the stream network during winter storms, was inferred to be represented in 18 of the 204 sites. This inference was based on comparing the basin area computed from the geospatial boundary to the contributing and total drainage areas in the USGS NWIS database. The percentage of the total drainage area that was inferred to consist of noncontributing drainage areas for these 18 sites ranged from from 1 to 70 percent. The percentage of the basin that is considered a noncontributing drainage area is stored in the field PCTNONC in the basin's attribute table. BASINS EXTENDING BEYOND THE U.S. BORDER: Eleven of the 204 basins extend beyond the U.S. border. The USGS site-identification number (STAID), the percentage of the basin within the U.S.(% IN US), the total drainage area in square kilometers (BAS_SQKM), and site name (SIT_NAME) for these basins are listed below: STAID % IN US BAS_SQKM SIT_NAME 08475000 60 557,549 Rio Grande near Brownsville, TX 14246900 85 670,022 Columbia River at Beaver Army Terminal, OR 06185500 89 239,753 Missouri River near Culbertson, MT 12213140 94 2,024 Nooksack River at Brennan, WA 05102490 95 92,086 Red River of the North at Pembina, ND 06610000 97 831,582 Missouri River at Omaha, NE 09514000 98 116,964 Buckeye Canal near Avondale, AZ 06934500 98 1,345,262 Missouri River at Hermann, MO 07022000 99 1,840,033 Mississippi River at Thebes, IL 01184000 99 25,049 Connecticut River at Thompsonville, CT 07373420 99 2,965,244 Mississippi River at St. Francisville, LA CHANGES TO USGS SITE-IDENTIFICATION (STAID) NUMBERS: The STAIDs for 3 stations, originally a 15-digit number was changed to a 8-digit number by the USGS NWIS administrators in the Texas Water Science Center. The 3 sites/basins are listed below. The current STAID is what is used in this dataset but the 15-digit STAID was used in the 2010 release of the WARP basins. PREVIOUS STAID CURRENT STAID SIT_NAME 295001094384699 08042575 Whites Bayou at Hwy 61, Anahuac, TX 295740094542399 08067190 W Prong Old Rv at SH 146 nr Dayton, TX 294349094345999 08042547 E Fk Double Bayou at Sykes Rd nr Anahuac, TX SPECIAL-CASE BASINS: There are several basins that have unique conditions that users should make note of prior to their use. They are listed below, and also included in the COMMENT field in the basin's attribute table: --For two sites, the water-quality sampling took place downstream from the USGS gaging site. Consequently, basins for these two sites are delineated from the actual sampling location rather than the USGS gaging site. Specifically, a) the basin boundary b02175000.shp corresponds to 11 km south of the USGS gaging site 02175000 (Edisto River near Givhans, SC), and b) the basin boundary b02469762.shp corresponds to 2 km south of the USGS gaging site 02469762 (Tombigbee River below Coffeeville Lock & Dam near Coffeeville, AL). --The basin boundary for site 11273500 (Merced River at River Road Bridge near Newman, CA), consists of two isolated polygons because water feeds into the basin by way of artificial canals. The areas of each polygon were summed to determine the area of this basin. Please note that the output of GIS functions may produce multiple records for this basin and require additional calculations to obtain the desired outcome. -- Water-quality and streamflow at some sites are highly influenced by the diversion of water into or out of the basin. Three sites in this dataset are known to be highly influenced by diversions: STAID SIT_NAME 07373420 Mississippi River near St. Francisville, LA 07381495 Atchafalaya River at Melville, LA 08475000 Rio Grande near Brownsville, TX For the basins listed above, users are strongly encouraged to review figures 2-4 and read the section "Consideration of Flow Routing for Selected Basins in the Data Set" in Baker (2011). -- The drainage areas for two basins differ significantly from the drainage area published in USGS NWIS database (as of 9/27/12). The GIS and NWIS drainage areas for these sites are listed below. *-999 denotes the NWIS field is not populated GIS = basin area based on the basin boundary, in square kilometers NWIS-con = contributing drainage area from NWIS, in square kilometers NWIS-tot = total drainage area from NWIS, in square kilometers Pct_diff = percent difference of GIS to NWIS-con, if populated; otherwise compared to NWIS-tot. Calculated by taking the difference in area of the GIS basin with the value reported in NWIS, divided by the value reported in NWIS, multiplied by 100 STAID GIS, NWIS-con, NWIS-tot, Pct_diff 08475000, 557549, 456700, 456700, 22.1 11303500, 19030, -999, 13536, 45.7 08475000 (Rio Grande near Brownsville, TX): The basin boundary for this site was extracted from Baker (2011), and the difference in area compared to NWIS is described in her documentation as follows: "The drainage area for this delineation of the Rio Grande River near Brownsville is 215,270 square miles with 177,415 square miles contributing area, 35,291 square miles noncontributing area, and 2,564 square miles for the Laguna Madre diversion basin. The drainage area published in U.S. Geological Survey NWIS records is 176,333 square miles. The value published in NWIS does not include the noncontributing area or the 2,564 square miles for the Laguna Madre basin. When these two factors are taken into account, the resulting comparable drainage area is 177,415 for this delineation or a 0.61 percent difference between the NWIS published area and the comparable drainage area for this version." 11303500 (San Joaquin R nr Vernalis, CA): - The basin boundary represents the perennial drainage area and reflects the artificial controls by canals. The basin area stored in NWIS does not consider artificial controls within the basin and thus is much smaller (Jo Ann M. Gronberg, U.S. Geological Survey, written communication, December 2004). -SPECIAL-CASE BASINS REFERENCES: Baker, N.T., 2011, National Stream Quality Accounting Network and National Monitoring Network Basin Boundary Geospatial Dataset, 200813: U.S. Geological Survey Data Series 641, 16 p., accessed December 7, 2011, at http://pubs.usgs.gov/ds/641/ U.S. Geological Survey, 2004, Watersheds for U.S. Geological Survey National Stream Quality Accounting Network (NASQAN) sampling sites 1996-2000 (ed. 1.0): U.S. Geological Survey digital vector data, accessed December 7, 2011, at http://water.usgs.gov/lookup/getspatial?nasqan2k 1995 2011 The time period during which the basin boundaries were delineated. Complete Although this data set is considered complete at this time, there may be future releases of basin boundaries due to added sites or enhanced basin boundaries. -127.87 -65.35 48.24 22.87 none NAWQA National Water Quality Assessment WARP Watershed Regressions for Pesticides model basin regression model drainage basin river basin catchment basin boundary drainage area ISO 19115 Topic Category inlandWaters none conterminous United States None Because these basin delineations were created by a number of people over a time period using different data sources and methods, boundaries of nested and adjacent basins are not entirely coincident. Naomi Nakagaki U.S. Geological Survey Geographer mailing address

USGS, CSUS Placer Hall, 6000 J Street

Sacramento California 95819 USA 1-916-278-3092 nakagaki@usgs.gov http://water.usgs.gov/GIS/browse/warpbas2012.png Illustration of dataset PNG Reviews of the metadata and data set were provided by Chris Sanocki, Katherine Paybins and Thomas Trombley, all of the U.S. Geological Survey. Much appreciation goes to the many USGS hydrologists and geographers who spent countless hours delineating the basin boundaries that comprise this data set. The majority of the basins were developed prior to the availability of automated basin delineation tools. The names of these USGS hydrologists and geographers are listed below, in alphabetical order: Terri L. Arnold, Nancy T. Baker, Kymm K. Barnes, Robert L. Baskin, William B. Blanks, Richard W. Bell, Steven Bolssen, John W. Brakebill, Gary R. Buell, Daniel T. Button, Jimmy M. Clark, Joseph F. Connell, Lance M. Cooper, Patricia D'Arconte, A.L. Derosier, Janet M. Denis, Ross G. Dickinson, Paul C. Dunne, Jean A. Dupree, Sarah M. Flanagan, Douglas A. Freehafer, JoAnn M. Gronberg, Alan L. Haggland, Paul E. Hanson, Laura L. Hallberg, John S. Harvill, Craig A. Harvey, Julian A. Heilman, Scott A. Hoffman, Evelyn H. Hopkins, Hank Johnson, Michaela R. Johnson, Tyler Y. Johnson, S.K. Kelley, Janet Kelley, Moon H. Kim, Donna L. Knifong, David L. Lorenz, Lori Mattern, Molly A. Maupin, David S. McCulloch, Gerard McMahon, Rose L. Medina, Reavis L. Mitchell III, Matthew W. Moix, Daniel K. Pearson, Jack Pflaumer, David T. Poynter, Julie A.H. Rees, Jennifer Lanning-Rush, James I. Sams III, Chris A. Sanocki, A. Alejandro Sepulveda, Steven Sobieszczyk, Peter A. Steeves, Verlin C. Stephens, Jana S. Stewart, Silvia E. Terziotti, Frank D. Voss, Michael E. Wieczorek, Daniel S. Yeatts, and Ronald B. Zelt Stone, W.W. and Gilliom, R.J. 2009 U.S. Geological Survey Open-File Report 2009-1122 http://pubs.usgs.gov/of/2009/1122/ Stone, W.W., Gilliom, R.J., and Crawford, C.G. 2008 U.S. Geological Survey Open-File Report 2008-1186 http://pubs.usgs.gov/of/2008/1186/ The attribute values were inspected and found to be consistently coded as described in the Entity_and_Attribute_Information section. Shared boundaries of adjacent or nested basins may not be entirely consistent. The drainage area for the USGS site, 04193490 (Maumee River near Waterville, OH) is excluded from this dataset because the boundary for 04193500 (Maumee River at Waterville, OH) was used to represent the drainage for 04193490. To avoid confusion, the basin boundary for 04193490 is not part of this dataset. In addition, basin boundaries for all non-USGS WARP sites are excluded from this dataset. These sites represent drinking-water intakes and their basin delineations are considered proprietary. Visual checks with background maps of hydrography, shaded relief, and U.S. Geological Survey sampling sites were conducted to ensure basin delineations are adequate for computing parameters used in the WARP model. The accuracy for a basin boundary is variable as they were derived from many different sources with varying scales or resolutions. Refer to the individual basin metadata files for information on how basin delineations were generated. Basin boundaries were collected from many USGS GIS specialists and hydrologists. 1995 - 2011 The attributes listed below were added to the basin attribute tables. For the full description of these attributes, please refer to the section, Entity_and_Attribute_Information -> Detailed_Description. BAS_SQMI: basin area, in square miles BAS_SQKM: basin area, in square kilometers PCTINUS: percentage of basin within the U.S. BAS_TYPE: type of basin BAS_SRC: scale or resolution of the source data PCTNCON: percentage of basin that is considered to be a noncontributing drainage area SIT_LAT83: latitude coordinate of site, in decimal degrees, NAD83 SIT_LON83: longitude coordinate of site, in decimal degrees, NAD83 SIT_NAME: name of corresponding sampling station COMMENT: comment on any special characteristic of the basin delineation 2012 To ensure consistency among the data structure of the 204 basin boundaries, minor edits have been made to the original geospatial data. These edits included the elimination of extra pseudo nodes and polygons or slivers contained within the outer boundary, and the horizontal datum transformation from NAD27 to NAD83 where necessary. 2012 Vector G-polygon 1 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 10.00004482269 10.00004482269 Meters North American Datum of 1983 GRS1980 6378206.4 294.98 Bxxxxxxxx.DBF where xxxxxxxx represents the USGS site-identification number Vector attribute table ArcInfo GIS software STAID Numeric identifier for the site corresponding to the basin USGS National Water Information System (NWIS) database, as of December 2011 USGS site-identification number C1 (site_no) from USGS NWIS database BAS_SQMI Basin area, in square miles, determined by multiplying 0.0000003861 with the area of basin polygon (expressed in square meters) as calculated by the GIS software. Area is calculated with the basin boundary in the National Albers Projection (projection parameters are listed under Spatial_Reference_Information). USGS 0.01 99,999,999 BAS_SQKM Basin area, in square kilometers, determined by dividing 1,000,000 from the area of the basin polygon (expressed in square meters) as calculated by the GIS software. Area is calculated with the basin boundary in the National Albers Projection (projection parameters are listed under Spatial_Reference_Information). USGS 0.01 99,999,999 PCTINUS Percentage of basin within the conterminous United States. Some basins extend into Canada or Mexico; these basins have a value less than 100. This number was determined by overlaying the basin boundary with a 1:2,000,000-scale digital map of U.S. boundaries and dividing the area of their intersection by the total basin area, then multiplying by 100. USGS 1 100.00 BAS_TYPE Type of basin represented by the boundary. The type of basin was inferred by comparing the drainage area computed from the boundary in this dataset (BAS_SQMI) to the values of total drainage area and contributing drainage stored in the USGS NWIS database, as of December 2011 USGS tot boundary represents total drainage area C808 (drain_area_va) from USGS National Water Information System (NWIS) database, as of December 2011 con boundary represents contributing drainage area C809 (contrib_drain_area_va) from USGS National Water Information System (NWIS) database, as of December 2011 unk unknown; the type of basin could not be inferred because NWIS contributing and/or total drainage areas were not populated USGS PCTNONC Percentage of basin that is considered to be a non- contributing drainage area. Determined by dividing the contributing drainage area in NWIS (C809 contrib_drain_area_va) by the total drainage area in NWIS (C808 drain_area_va), multiplied by 100 USGS 1 100.00 BAS_SRC Scale or resolution of the source(s) used to delineate the boundary The metadata files from USGS authors of basin boundary. If the scale was not specified in the metadata, the scale was estimated by comparison to existing nationwide basin boundaries. Compared to National Watershed Boundary Dataset (WBD), at the 1:24,000 scale and Hydrologic Unit Boundaries at the 1:250,000 scale. Sources used: Steeves, P.A. and Nebert, D.D., 1994, Hydrologic unit maps of the conterminous United States: U.S. Geological Survey digital vector data, accessed December 27, 2011, at http://water.usgs.gov/lookup/getspatial?huc250k U.S. Department of Agriculture, 2009, National Watershed Boundary Dataset: Fort Worth, Tex., Natural Resources Conservation Service, National Cartography and Geospatial Center, accessed December 27, 2011 at http://www.ncgc.nrcs.usda.gov/products/datasets/basin/ 24k,100k,250k,30m,60m,80m 24k = 1:24,000-scale USGS topographic maps 100k = 1:100,000-scale USGS topographic maps 250k = 1:250,000-scale USGS topographic maps 500k = 1:500,000-scale USGS topographic maps 30m = 30-meter resolution Digital Elevation Model data 60m = 60-meter resolution Digital Elevation Model data 80m = 80-meter resolution Digital Elevation Model data User assigned SIT_LAT83 Latitude (decimal degrees) of the USGS site corresponding to the basin, in horizontal datum NAD83 C909 (dec_lat_va) from USGS National Water Information System (NWIS) database, as of December 2011 25.40 48.98 SIT_LON83 Longitude (decimal degrees) of the USGS site corresponding to the basin, in horizontal datum NAD83, decimal degrees C910 (dec_long_va) from USGS National Water Information System (NWIS) database, as of December 2011 -123.18 -71.14 SIT_NAME Name of the USGS site corresponding to the basin, as of June 12, 2012 C900/C12 (station_nm) from USGS National Water Information System (NWIS) database, as of December 2011 Unique station names COMMENT Comment regarding unique issue(s) related to the basin or site USGS Unique issues regarding basin or site, or blank if there are none U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although these data have 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. 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 these 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. Esri Shapefiles Shapefiles and metadata for each basin winzip 11.4 MB http://water.usgs.gov/GIS/dsdl/warpbas2012.zip none 201210 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+warpbas2012 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998