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)

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Metadata:

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: <URL:http://water.usgs.gov/nawqa-only/gw.html>

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: <URL:http://water.usgs.gov/lookup/getspatial?rech48grd>
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

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