Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 200702 Title: NAWQA GIS ancillary data: Overland flow, mean annual recharge, mean annual runoff, slope, topographic wetness index, and subsurface flow contact time for ground water study areas (Land Use Studies and Subunit Surveys) Online_Linkage: Description: Abstract: This data set consists of percent Dunne overland flow from TOPMODEL, percent Horton overland flow from TOPMODEL, mean annual recharge, mean annual runoff (1951-80), slope from 1-km resolution DEMs, topographic wetness index, and subsurface flow contact time for NAWQA ground water study areas (Land Use Studies and Subunit Surveys). The input grids were prepared by David Wolock. Purpose: This is one of the ancillary GIS data layers developed to characterize NAWQA ground water studies for national synthesis of water-quality data. Supplemental_Information: The input data set did not include Alaska and Hawaii. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1991 Single_Date/Time: Calendar_Date: 2001 Currentness_Reference: The data set is intended to represent conditions for the early 1990's to late 1990's. Status: Progress: Complete Maintenance_and_Update_Frequency: NAWQA cycle 2 study areas will be added as their boundaries become available. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -125 East_Bounding_Coordinate: -66 North_Bounding_Coordinate: 50 South_Bounding_Coordinate: 24 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Ground water Theme_Keyword: Surface water Theme_Keyword: Water quality Theme_Keyword: Overland flow Theme_Keyword: Dunne overland flow Theme_Keyword: Horton overland flow Theme_Keyword: Mean annual recharge Theme_Keyword: Slope Theme_Keyword: Topographic wetness index Theme_Keyword: Subsurface flow contact time Theme_Keyword: Land use study Theme_Keyword: Subunit survey Theme_Keyword: Major aquifer Access_Constraints: The data set is for internal USGS access only. Use_Constraints: The data set is for internal USGS use only. Data_Quality_Information: Logical_Consistency_Report: none Completeness_Report: none Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Wolock, D.M. Publication_Date: 2002 Title: Overland flow, runoff, slope, topographic wetness index, and subsurface flow contact grids Type_of_Source_Media: On line Source_Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1951 Single_Date/Time: Calendar_Date: 1990 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: None Source_Contribution: 5K grids of percent Dunne overland flow from TOPMODEL and percent Horton overland flow from TOPMODEL. 1K grids of mean annual runoff (1951-80), slope from 1-km resolution DEMs, topographic wetness index, and subsurface flow contact time. Source_Information: Source_Citation: Citation_Information: Originator: Wolock, D.M. Publication_Date: 2003 Title: Estimated mean annual natural ground-water recharge in the conterminous United States Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 03-311 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: Type_of_Source_Media: On line Source_Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1951 Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: None Source_Contribution: 1K grid of mean annual recharge created by multiplying BFI by mean annual runoff. Source_Information: Source_Citation: Citation_Information: Originator: Hitt, K.J. Publication_Date: 200304 Title: Boundaries of the land use study (LUS) and subunit survey (SUS) ground-water studies conducted by the National Water-Quality Assessment (NAWQA) study units Edition: 3 Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1991 Ending_Date: 2004 Source_Currentness_Reference: current Source_Citation_Abbreviation: GWPOLYS Source_Contribution: The boundaries of the LUS and SUS ground water study areas, as submitted by the NAWQA study units. Process_Step: Process_Date: 20040331 Process_Description: Ground water study boundaries are gridded at 30 meters and snapped to the NLCDE. Data processing occurs at 30 meters resolution. The mean of each hydrologic variable was determined for the study area by running the GRID command, "zonalstats" with the mean option. Processing routines are from the NAWQA area characterization toolbox. Process_Step: Process_Date: 20040630 Process_Description: Ground water study boundaries were re-gridded to correct a problem. (Previous version did not account for interior areas that are excluded from the study area.) The procedure to calculate a mean for each hydrologic variable was repeated. Process_Step: Process_Date: 20040722 Process_Description: Received new boundary for cycle 1 SANJLUSOR1A_TRG, SANJLUSOR1B_TRG. Recalculated hydrologic variables for these areas. Process_Step: Process_Date: 20050412 Process_Description: Recalculated data for several cycle 2 areas. For the previous calculations, the doughnut holes in the some of the study areas had not been removed in the gridded versions of the study areas. This affects seven study areas: with doughnuts without doughnuts cut out (correct) not cut out (incorrect) AREAID GRID AREA (M2) GRID AREA (M2) cnbrluscr1_bnd 7,044,202,800.000 7,392,941,100.000 cnbrluscr1_trg 5,706,866,700.000 6,766,256,700.000 connlusrc1_bnd 1,756,677,600.000 2,064,634,200.000 connlusrc1_trg 587,594,700.000 610,191,000.000 connsus2_bnd 6,848,918,100.000 7,617,282,300.000 nvbrlusrc1_trg 155,431,800.000 155,443,500.000 spltluscr2_trg 207,267,300.000 228,433,500.000 Also added studies that are resampled studies, but do not have the same boundaries in cycle 2 as were used in cycle 1: albelusag1, nvbrsus2, trinsus3, sanjluscr1a, sanjlusor2a. Also added willlusag3, which has the same boundaries as cycle 1 willlusag2. Process_Step: Process_Date: 20050622 Process_Description: Replaced data for santlusrc1_bnd. The study area santlusrc1_bnd should be the same as santsus1_bnd, not the same as santsus2_bnd. Process_Step: Process_Date: 20061107 Process_Description: Reprocessed data using September 2005 version of NLCDE land use and counties and added new LUSs and MASs acadsus3, eiwasus3, linjlusrc1, lirblusrc1, pugtlusrs1, sacrlusrc1, trinsus4, usnkluscr2, usnkluscr3. Spatial_Data_Organization_Information: Indirect_Spatial_Reference: The data set is referenced by SUCODE (NAWQA study unit/network code) and AREAID (ground water study boundary coverage). Two kinds of ground water network polygon coverages exist: 1) BND coverages, which represent the entire areal extent of the hydrogeologic unit defined for study, and 2) TRG coverages, which delineate the targeted land use within the BND. Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The data set is organized by SUCODE and AREAID. The hydrologic variables data represent weighted averages for the study area. The fields are: !SUID NAWQA study unit !SUCODE NAWQA study unit/network code !AREAID Ground water boundary coverage !PERDUN Percent Dunne overland flow from TOPMODEL (%) !PERHOR Percent Horton overland flow from TOPMODEL (%) !RECHARGEBFI Mean annual recharge from base-flow analysis ! and Gebert runoff (inches) !RUNOFF Mean annual runoff (1951-80) from Gebert (inches) !SLOPE Slope from 1-km resolution DEMs (%) !TWI Topographic wetness index from 1-km resolution DEM (ln(m)) !CONTACT Subsurface flow contact time (days) Entity_and_Attribute_Detail_Citation: None Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Kerie Hitt Contact_Organization: USGS NAWQA Nutrients National Synthesis Contact_Address: Address_Type: Mailing address Address: 413 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Electronic_Mail_Address: kjhitt@usgs.gov Contact_Voice_Telephone: 703 648-6854 Contact_Instructions: Contact via email Distribution_Liability: USGS assumes no liability for the use of this data set. Metadata_Reference_Information: Metadata_Date: 200702 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Kerie Hitt Contact_Organization: USGS NAWQA Nutrients National Synthesis Contact_Address: Address_Type: Mailing address Address: 413 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Electronic_Mail_Address: kjhitt@usgs.gov Contact_Voice_Telephone: 703 648-6854 Contact_Instructions: Contact via email Metadata_Standard_Name: Content standards for digital geospatial metadata Metadata_Standard_Version: FGDC-STD-001-1998