Michael E. Wieczorek Andrew E. LaMotte 2010 tabular digital data Digital Data Series DS-490-04 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nhd_bfi This tabular data set represents the mean base-flow index expressed as a percent, compiled for every catchment in NHDPlus for the conterminous United States. Base flow is the component of streamflow that can be attributed to ground-water discharge into streams. The source data set is Base-Flow Index for the Conterminous United States (Wolock, 2003). The NHDPlus Version 1.1 is an integrated suite of application-ready geospatial datasets that incorporates many of the best features of the National Hydrography Dataset (NHD) and the National Elevation Dataset (NED). The NHDPlus includes a stream network (based on the 1:100,00-scale NHD), improved networking, naming, and value-added attributes (VAAs). NHDPlus also includes elevation-derived catchments (drainage areas) produced using a drainage enforcement technique first widely used in New England, and thus referred to as "the New England Method." This technique involves "burning in" the 1:100,000-scale NHD and when available building "walls" using the National Watershed Boundary Dataset (WBD). The resulting modified digital elevation model (HydroDEM) is used to produce hydrologic derivatives that agree with the NHD and WBD. Over the past two years, an interdisciplinary team from the U.S. Geological Survey (USGS), and the U.S. Environmental Protection Agency (USEPA), and contractors, found that this method produces the best quality NHD catchments using an automated process (USEPA, 2007). The NHDPlus dataset is organized by 18 Production Units that cover the conterminous United States. The NHDPlus version 1.1 data are grouped by the U.S. Geologic Survey's Major River Basins (MRBs, Crawford and others, 2006). MRB1, covering the New England and Mid-Atlantic River basins, contains NHDPlus Production Units 1 and 2. MRB2, covering the South Atlantic-Gulf and Tennessee River basins, contains NHDPlus Production Units 3 and 6. MRB3, covering the Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy River basins, contains NHDPlus Production Units 4, 5, 7 and 9. MRB4, covering the Missouri River basins, contains NHDPlus Production Units 10-lower and 10-upper. MRB5, covering the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf River basins, contains NHDPlus Production Units 8, 11 and 12. MRB6, covering the Rio Grande, Colorado and Great Basin River basins, contains NHDPlus Production Units 13, 14, 15 and 16. MRB7, covering the Pacific Northwest River basins, contains NHDPlus Production Unit 17. MRB8, covering California River basins, contains NHDPlus Production Unit 18. This spatial data set was created and used by the U.S. Geological Survey (USGS) specifically to estimate the base-flow index per watershed segment in the application of the national SPAtially Referenced Regression On Watershed attributes (SPARROW) model. The SPARROW model relates in-stream water-quality measurements to spatially referenced characteristics of watersheds, including contaminant sources and factors influencing terrestrial and stream transport. The model empirically estimates the origin and fate of contaminants in streams, and quantifies uncertainties in these estimates based on model coefficient error and unexplained variability in the observed data. For more information on the USGS SPARROW model please refer to: http://water.usgs.gov/nawqa/sparrow/intro/intro.html. 2002 publication date Complete None planned -127.910792 -65.327751 51.657387 23.243486 None Base-flow index Inlandwaters NHDPlus Catchment NAWQA SPARROW None Conterminous United States MRB Major River Basin MRB1 NEMA New England and Mid-Atlantic MRB2 SAGT South Atlantic-Gulf and Tennessee MRB3 GLMR Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy MRB4 MORI Missouri MRB5 LMTG Lower Mississippi, Arkansas-White-Red, and Texas-Gulf MRB6 COGB Rio Grande, Colorado, and Great Basin MRB7 PANW Pacific Northwest MRB8 CALI California None None U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html http://water.usgs.gov/GIS/browse/nhd_bfi.jpg Illustration of the dataset jpg Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 Charles G. Crawford Pixie A. Hamilton Anne B. Hoos October 5, 2006 Reston, Virginia U.S. Geological Survey Prepared by Charlie Crawford, Pixie Hamilton, and Anne Hoos for a NAWQA National Liaison Meeting, Washington D.C., October 5, 2006 http://water.usgs.gov/nawqa/studies/mrb/mrb_factsheet.pdf None None U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/NewEngland/NHDPlus01V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 1. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/MidAtlantic/NHDPlus02V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 1. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/SouthAtlanticGulf/NHDPlus03V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 2. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/GreatLakes/NHDPlus04V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus05V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus06V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 2. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus07V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus08V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/SourisRedRainy/NHDPlus09V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus10LV01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 4. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus10UV01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 4. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus11V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/TexasGulf/NHDPlus12V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/RioGrande/NHDPlus13V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Colorado/NHDPlus14V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Colorado/NHDPlus15V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/GreatBasin/NHDPlus16V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/PacificNorthwest/NHDPlus17V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 7. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/California/NHDPlus18V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 8. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. Wolock, David M. 2003 raster digital data Open-File Report 03-263 Reston, VA U.S. Geological Survey http://water.usgs.gov/GIS/metadata/usgswrd/XML/bfi48grd.xml online 2003 publication date bfi The source data provided information on base flow index. 1) Downloaded the base-flow index GRID from http://water.usgs.gov/GIS/metadata/usgswrd/XML/bfi48grd.xml. 2) Resampled the base-flow index GRID from 1-kilometer to 30-meter to match the resolution of the NHDPlus catchment GRIDs downloaded from http://www.horizon-systems.com/nhdplus. 3) Summarized base-flow index by catchment using the ZONALMEAN command in GRID. 4) Exported results into a dbf file format. 2008 COMID code bfi dbf tabular data ESRI OID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. COMID Unique ID to relate to the NHDPlus catchments NHDPlus Sequential unique whole numbers that are automatically generated. BFI_MEAN Average base-flow index for each catchment U.S. Geological Survey 0 90 Percentage BFI_AREA Area of catchment that source GRID covers U.S. Geological Survey 900 6265806000.0 Square meters BASIN_AREA Area of catchment U.S. Geological Survey 900.0 67849006000.0 Square meters NODATA_ARE Area of catchment that source GRID does not cover U.S. Geological Survey 0.0 67844760000.0 Square meters COV_PERC Percent of catchment that source GRID covers U.S. Geological Survey 0 100 Percentage U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

455 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although this dataset 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 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. dbf Full coverage zipped 1769 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb1.zip dbf Full coverage zipped 4437 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb2.zip dbf Full coverage zipped 5544 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb3.zip dbf Full coverage zipped 5051 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb4.zip dbf Full coverage zipped 4517 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb5.zip dbf Full coverage zipped 3778 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb6.zip dbf Full coverage zipped 2689 KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb7.zip dbf Full coverage zipped 1628KB http://water.usgs.gov/GIS/dsdl/nhd_bfi_mrb8.zip None. This dataset is provided by the USGS as a public service. 20100817 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

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