Nancy T. Baker 2011 1.0 vector digital data Reston, Viriginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds641_nasqan_wbd12 Nancy T. Baker 2011 1 U.S. Geological Survey Data Series Report Data Series Data Series 641 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/641 This dataset and the accompanying Data Series report was created to assist in analysis and interpretation of water-quality data provided by the U.S. Geological Survey, National Stream Quality Accounting Network (NASQAN) and the National Monitoring Network (NMN). The report describes the methods used to develop the geospatial data which was primarily derived from the National Watershed Boundary Dataset (WBD12). The geospatial data contains polygon shapefiles of basin boundaries for 33 NASQAN and 5 NMN stations. In addition, 30 polygon shapefiles of the closed and noncontributing basins contained within the NASQAN or NMN boundaries where applicable are included. Also included is a point shapefile of the NASQAN and NMN gaging stations and associated basin and station attributes. The basin boundaries included in this dataset are for those sites implemented under the October 2007 design for the 5-years from 2008-2013 (http://water.usgs.gov/nasqan/). This dataset was created to assist in analysis and interpretation of the U.S. Geological Survey NASQAN water-quality data. Geospatial watershed data are often used in conjunction with water-quality data for modeling, calculation of loads, and calculation of selected basin characteristics. Basin boundaries were obtained from 4 sources: 1) The majority of the basin boundaries were derived from the WBDHU12_03Feb2011_ArcGIS9.2_File.gdb 12-digit Hydrologic Unit National Watershed Boundary Dataset (WBD12) (U.S. Department of Agriculture, 2009); 2) The basin boundary from the NASQAN station location to the nearest WBD12 Subwatershed boundary was generated by interpretation of topographic information from digitizing the ArcGIS Online 1:24:000 scale USA topographic maps (National Geographic Society, 2011); 3) Basins extending into Canada farther than the WBD12 were derived from 1:1,000,000 "canadwshed_1m_v6-0_shp" data (Canadian Geospatial Data Infrastructure, 2009);and 4) The portion of the Rio Grande near Brownsville, TX (08475000) that extends into Mexico was obtained from Patino and others (2004). Additional information about closed and noncontributing basins were obtained from Seaber and others (1987) for the Arkansas River, and Lurry and others (1998) for the Rio Grande River. *************Special Note for Lower Mississippi River and Atchafalaya River***************** Basins stations 07381590 Wax Lake Outlet at Calumet, LA and 07381600 Atchafalaya River at Morgan City, LA should be considered together. The Atchafalaya River bifurcates below Melville, LA with a portion of the flow draining through the main channel to Morgan City and a portion draining into Wax Lake Outlet into the Gulf of Mexico. The basin boundary for 07381590 Wax Lake Outlet includes the only the area draining Bayou Teche and a small part of the Atchafalaya main stem near the Wax Lake Outlet. There is no reliable way to determine the areal portion of the Atchafalaya River Basin that drains through the Wax Lake Outlet and the portion that drains through the main stem. Users of the NASQAN water-quality data for either Wax Lake Outlet and/or the Atchafalaya River at Morgan City should consider both basin boundaries and combined water-quality data for both stations. In addition, a portion of flow on the lower Mississippi River is diverted through the Old River Outflow Channelto the Atchafalaya River. Affected stations on the Mississippi River side include 07373420 near St. Francisville, LA,07374000 at Baton Rouge, LA and 07374525 at Belle Chasse, LA. Affected stations on the Atchafalaya River side of the diversion include 07381495 at Melville, LA, 07381590 Wax Lake at Calumet, LA, and 07381600 at Morgan City, LA. All of these stations should be considered together when assessing water quality and flow data. Users of water-quality data for these stations should also consider flow records for U.S. Geological Survey station Old River Outflow Channel near Knox Landing, LA (07294800), Mississippi River at Tarbert Landing, MS (07295100), and Atchafalaya River at Simmesport, LA (07381490). **********************************Special Note for the Rio Grande River*************************** Much of the flow in the Rio Grande upstream from the Brownsville, TX station (08475000) is diveted into the Anzalduas Canal which flows through the Anzaldual Dam near Mission, TX and then into Arroyo Colorado. Almost all the water withdrawn from the Arroyo Colorado or the Rio Grande for irrigation and municipal purposes is returned to the Arroyo Colorado. The Arroyo Colorado drains into the Laguna Madre (WBD12 HUCs 1211020801--1211020809), which effectively becomes an estuary for the Rio Grande during spring and summer irrigation seasons. Users of the NASQAN water-quality data for the Rio Grande near Brownsville, TX should consider flow and water-quality data for U.S. Geological Survey station Arroyo Colorado at Harlingen, TX (08470400). The Laguna Madreis included in the basin delineation for station 08475000. 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. **********************************Special Note for the Colorado River****************************** Much of the flow upstream of the U.S. Geological Survey station Colorado River at the Northern International Boundary (NIB), AZ (09522000) is diverted into the All-American Canal. The All-American Canal diversion is downstream of station Colorado River above Imperial Dam, Arizona-California (09429490). Flow data from this station should be considered when assessing water-quality records for the NIB station. 2007 2011 This dataset is for NASQAN and NMN stations in the network as of October 2007: http://water.usgs.gov/nasqan/ Complete As needed -76.172623 -72.577338 44.387666 40.806177 none inland waters hydrologic units watershed basin boundary drainage area WBD none United States None None--subject to revision Nancy T. Baker U.S. Geological Survey, Indiana Water Science Center GIS Specialist mailing and physical address

5957 Lakeside Blvd

Indianapolis Indiana 46278 United States 317-290-3333 x185 317-290-3313 ntbaker@usgs.gov 7:00 am to 3:30 pm M-F http://water.usgs.gov/GIS/browse/ds641_browse_graphic.png Illlustration of data set png Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3000 None None U.S. Department of Agriculture 2009 03Feb2011_ArcGIS9.2 vector digital data Fort Worth, TX U.S. Department of Agriculture Accessed March 2011 http://datagateway.nrcs.usda.gov online 2009 publication date WBD12 Spatial and attribute information--primary source for basin boundary linework National Geographic Society 2009 Not specified image files served interactively ArcGIS website served by National Geographic Society U.S. Geological Survey original publisher of topographic maps Accessed May 2011 http://server.arcgisonline.com/ArcGIS/rest/services/USA_Topo_Maps/MapServer online 2009 publication date TOPO Spatial information--provided underlay of 1:24,000 topographic maps so that the drainage divide could be digitized from the WBD12 line to the basin mouth (U.S. Geological Survey gaging station) Patino, C., McKinney, D.C., Maidment, D.R. 2004 1.0 vector digital data Austin, TX University of Texas, Center for Research in Water Resources Accessed August, 2011 http://www.crwr.utexas.edu/riogrande.shtml online 2004 publication date RG Spatial information for station b08475000 (basin boundary south of US/Mexican border) Lurry, D.L., Reutter, D.C., and Wells, F.C. 1998 None fact sheet Reston, VA U.S. Geological Survey Accessed August, 2011 http://water.usgs.gov/nasqan/docs/riogrndfact/riogrndfactsheet.html online 1998 publication date RGFS Supplemental information for station b08475000 (basin boundary south of US/Mexican border) Canadian Geospatial Data Infrastructure 2009 v6 vector digital data Canada Canada Land Inventory Level-I Digital Data. Accessed December, 2010 http://geogratis.cgdi.gc.ca online 2009 publication date CAWBD Spatial information for stations extending north of the Canadian border and north of the WBD12 boundaries in Canada--b04267331, b14246900, and b15565447. Seaber, P.R., Kapinos, F.P., and Knapp, G.L. 1987 None paper maps and text Denver, CO U.S. Geological Survey Water Supply Paper 2294 http://pubs.usgs.gov/wsp/wsp2294/ paper maps 1987 publication date WSP2294 Spatial information for stations extending north of the Canadian border and north of the WBD12 boundaries in Canada--b04267331, b14246900, and b15565447. Step 1: Use the Selection by attributes tool in ArcMap to select all 12-digit hydrologic unit (HU) watersheds upstream of the NASQAN gaging station from the WBD12 dataset. The selected HUs were exported to .shp files. WBD12 20110515 Step 2: For watersheds in which the mouth (gaging station) did not fall on a 12-digit HU line, the mouth of the watershed was digitized to the nearest HU line. 1:24,000 scale USA Topographic online maps were used to determine the basin divide from the nearest HU to the mouth of the basin. TOPO 20110515 Step 3: Dissolved all internal HU lines so that only the basin boundary polygon remained. 20110615 Step 4: Projected all shapefiles into Albers Equal Area projection and converted into ArcInfo coverages and edited as needed 20110615 Step 5: For basins that extended into Canada farther than the WBD12, basin boundaries were delineated in the same manner desribed above using the 1:1,000,000 scale canadwshed_1m_v6-0_shp data (Canadian Geospatial Data Infrastructure, 2009). The Canadian portion of watersheds extending into Canada were then appended to the WBD12 derived polygons for the U.S. side of the basins using the ArcInfo Append command. CAWBD 20110615 Step 6: The portion of the Rio Grande near Brownsville, TX (08475000) that extends into Mexico was obtained from the Rio Grande basin boundary generated by Patino and others, 2004. The Mexican portion of watershed was then appended to the WBD12 derived polygon for the U.S. side of the basin using the ArcInfo Append command. RG1 20110715 Step 7: Converted all ArcInfo coverages into shapefiles for publication. 20110701 Step 8: Closed and noncontributing sub-basins were extracted from the WBD12 data.All sub-basins labeled "closed" in the WBD12 HUC_10_DS or HUC_12_DS attribute were selected. All sub-basins with NCONTRB_A greater than 0 and not labeled "closed" in the WBD12 HUC_10_DS or HUC_12_DS attribute were selected. The Intersect command in ArcGIS was then used to assign the closed or noncontributing sub-basins contained within each NASQAN or NMN basin. A separate shapefile containing all the closed and noncontributing sub-basins was generated for each NASQAN or NMN basin when those basins existed. The shapefile naming convention for these basins is the STAID preceeded by the letter "n"). 20110701 Step 9: Additional closed sub-basins were added to the shapefiles generated in Step 8 where the WBD12 information is incomplete. Often sub-basins upstream of a closed system are not labeled as closed. These basins were determined by visual inspection and added to the appropriate basin file. Seaber and others (1987) was also used to identify Subwatersehds that should be included in the closed category. 201107801 Metadata imported. H:\Temp\xml6C.tmp 20111021 13192300 Vector G-polygon 1 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 coordinate pair 1.000000 1.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 NASQAN/NMN Basin Boundaries Basin boundary polygons Generated from WBD12 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of polygon in square coverage units (meters) calculated Positive real numbers PERIMETER Perimeter of polygon in coverage units (meters) calculated Positive real numbers B01372058_ Coverage name ("b" and station id) # id from coverage version Unique identifier based on filename generated by ArcInfo coverage conversion B013720581 Coverage name ("b" and station id) -id from coverage version (artifact from ArcInfo) Unique identifier based on filename generated by ArcInfo coverage conversion STAID Station Identifier U.S. Geological Survey National Water Inventory System Character string STANAME Station name U.S. Geological Survey National Water Inventory System Character string SUBNETWORK National Stream Quality Accounting Network subnetwork name U.S. Geological Survey NASQAN MARB ; Basins that drain to the Mississippi or Atchafalaya River NASQAN program Coastal; Basins that drain to coastal waters NASQAN program NMN ; National Monitoring Network National Monitoring Network Program DAMI2 Drainage area of the basin in square miles Calculated from AREA: DAMI2 = AREA/2589988.11) 0 1,200,000 Square miles NASQAN/NMN Noncontributing and Closed Basins Polygons labeled as 'Closed' or 'Noncontributing' WBD12 and Seaber and others (1987) FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of polygon in square coverage units (meters) calculated Positive real numbers PERIMETER Perimeter of polygon in coverage units (meters) calculated Positive real numbers STAID Station identifier U.S. Geological Survey National Water Inventory System Character string HUC_12 Twelve Digit Hydrologic Unit Code: This field provides a unique 12-digit code for each subwatershed. Numbers were assigned in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion. U.S. Geological Survey and U.S. Department of Agriculture, Natural Resources Conservation Service, 2011, Federal Standards and Proceedures for the National Watershed Boundary Dataset (WBD) (2nd ed.) U.S Geological Survey Techniques and Methods 11-A3. 010000000000 999999999999 ACRES Area of subwatershed including non-contributing areas calculated to acres. The "Acres" field was calculated from the "AREA" field. U.S. Geological Survey and U.S. Department of Agriculture, Natural Resources Conservation Service, 2011, Federal Standards and Proceedures for the National Watershed Boundary Dataset (WBD) (2nd ed.) U.S Geological Survey Techniques and Methods 11-A3. 0 2500000 Acres -9999 Area of subwatershed including non-contributing areas calculated to acres . The "Acres" field was calculated from the "AREA" field. As needed NCONTRB_A Non-Contributing Area: Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. If a non-contributing area is on the boundary between two or more hydrologic units, the non-contributing area is associated with the hydrologic unit adjacent to the low point on the boundary. This attribute should be the total of the non-contributing areas within a hydrologic unit calculated in acres. U.S. Geological Survey and U.S. Department of Agriculture, Natural Resources Conservation Service, 2011, Federal Standards and Proceedures for the National Watershed Boundary Dataset (WBD) (2nd ed.) U.S Geological Survey Techniques and Methods 11-A3. 0 2500000 Acres As needed NCONTRBMI2 Noncontributing area of the HUC_12 Subwatershed polygon converted square miles Calculated NCONTRB_A/640 0 3906 Square miles HUC12MI2 Area of the 12-digit HUC in square miles Calculated from AREA geometry (AREA/2589988.11) 0 13000000 Square miles NCONPCT Percentage of the Subwatershed that is noncontributing Calculated from NCONTRBMI2 and HUC12MI2 Calculated Area (NCONTRBMI2/HUC12MI2)*100 Calculated from NCONTRBMI2 and HUC12MI2 attributes TYPE Type of Subwatershed (closed or noncontributing) Nancy Baker (assigned based on NCONPCT value) NONCONTRIBUTING If NCONPCT < 98 CLOSED If NCONPCT >= 98 nasqan_stations Basin boundary polygons Generated from WBD12 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. STAID Station identifier U.S. Geological Survey National Water Inventory System (NWIS) Character string NWIS_STAID U.S. Geological Survey Station NWIS Identification U.S. Geological Survey National Water Information System (NWIS) Character string BASFILENAM NASQAN or NMN basin shapefile name Assigned by Nancy Baker (B plus station identifier) Character string NCFILENAM NASQAN or NMN noncontributing basin shapefile name Assigned by Nancy Baker (N plus station identifier) Character string NWIS_NAME U.S. Geological Survey Station Name U.S. Geological Survey National Water Inventory System Character string SUBNETWORK National Stream Quality Accounting Network subnetwork code U.S. Geological Survey NASQAN MARB ; Basins that drain to the Mississippi or Atchafalaya River NASQAN program Coastal; Basins that drain to coastal waters NASQAN program NMN ; National Monitoring Network National Monitoring Network Program LONGITUDE Station longitude U.S. Geological Survey, NWIS -164.00 -70.00 LATITUDE Station latitude U.S. Geological Survey, NWIS 25.00 68.00 DAMI2 Drainage area of the basin in square miles Calculated from AREA geometry (AREA/258988.11) 0 13000000 Square miles TOTNCON Sum of closed and noncontributing areas for the basin in square miles Calculated by Nancy Baker Calculated number Sum of all noncontributing and closed Subwatershed contained within each NASQAN and NMN basin in square miles. Calculated in a separate spreadsheet by Nancy Baker by Merging all nXXXXXXX basins and summing the NCONTRBMI2 value. NWISDAMI2 Published U.S. Geological Survey, published NWIS drainage area in square miles NWIS 0 13000000 Square miles NWISCONMI2 Published U.S. Geological Survey, published NWIS contributing drainage area in square miles NWIS 0 13000000 Square miles NWISNCON NWIS Noncontributing drainage area in square miles Calculated area Noncontributing drainage area in square miles calculated by subtracting NWISDAMI2 - NWISNCON. Calculated from published values NWISDAMI2 - NWISNCON. NWISNASDIF Percent difference between U.S. Geological Survey, NWIS drainage area and calculated drainage area of the delineated basin boundary. Calculated by Nancy Baker Calculated percent difference ((DAMI2-NWISDAMI2)/NWISDAMI2)*100 Calculated by Nancy Baker U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

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. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. Description of format (e.g. ESRI Shapefile, TIFF raster file) PKZIP, WINZIP, WINRAR, TGZ, Tar, etc., compression Winzip 1000 http://water.usgs.gov/GIS/dsdl/ds641_nasqan_wbd12.zip None. This dataset is provided by USGS as a public service. 20110714 U.S. Geological Survey REQUIRED: Nancy T. Baker, U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds641_nasqan_wbd12 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time