South Atlantic Water Science Center - North Carolina Office

Rating Unsaturated Zone and Watershed Characteristics of Public Water Supplies - Updates

Metadata - Characterizing the Watershed Characteristics of North Carolina
Land-surface Percent Slope Category Ratings

• Identification Information
• Data Quality Information
• Spatial Data Organization Information
• Spatial Reference Information
• Entity and Attribute Information
• Distribution Information
• Metadata Reference Information

Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.

Identification Information:

Citation:

Citation information:

Originators: Silvia Terziotti

*Title:

condgw

*File or table name: condgw

Publication date: 2009

Edition: Version 1.0, June 30, 2009

*Geospatial data presentation form: raster digital data

Publication information:

Publication place: Raleigh, NC

Publisher: U.S. Geological Survey

*Online linkage: \\Igsavbewfs001\Work\SWAP_updates\FinalLayers\GW\condgw

Description:

Abstract:

Vertical series hydraulic conductance classes is one of 6 data
sets updated for the North Carolina Public Water Supply, Source
Water Assessment Program. These data are used to rate the susceptibility of
public water supplies in North Carolina to contamination.

The original dataset was produced in 2000. This version is updated to reflect new data sources.

This data set represents the ratings applied to conductance classes
for use in the rating of the unsaturated zone for public ground-water
suppliers.

The harmonic mean hydraulic conductance of a series of layers of
unsaturated material provides a single value for the capacity of
the entire sequence of the unsaturated zone to transmit water (with
or without contaminants) from the land surface to the water table.
For ground-water systems, the higher the conductance of the
unsaturated zone, the higher the rating applied on a scale of
1 to 10.

Purpose:

This data set is to be used in a hydrologic analysis with other
data sets to rate the unsaturated zone for public ground-water
supplies and watershed characteristics for public surface-water
supplies in North Carolina.

For ground-water supplies, the factors used to rate susceptibility to
contamination include vertical hydraulic conductance, land-surface slope,
land cover, and land use.  The selected factors used to devise ratings for
surface-water supplies' susceptibility to contamination are average annual
precipitation, land-surface slope, land cover, land use, and ground-water
contribution.

Supplemental information:

The 1996 Amendments to the Safe Drinking Water Act require that each state prepare a source-water assessment for all public water supplies. States are required to (1) delineate source areas supplying wells and surface-water intakes, (2) inventory potential contaminant sources within the delineated source areas, and (3) determine the susceptibility of wells or intakes to the inventoried potential contaminant sources.

In North Carolina, the lead agency charged with this task is the Public Water Supply Section (PWSS) of the Division of Environmental Health, Department of Environment and Natural Resources (DENR). North Carolina's Source Water Assessment Program (SWAP) provides assessments of each public drinking water intake in North Carolina. These assessments provide a relative susceptibility rating calculated using state-wide data.

The U.S. Geological Survey (USGS) cooperated with the PWSS to provide components of the inherent vulnerability rating that was used with the contaminant rating to determine the overall susceptibility rating of source water supplies. To assist the PWSS with rating ground water inherent vulnerability, the USGS compiled the unsaturated zone rating based on the following characteristics: vertical hydraulic conductance, depth to water, land surface slope, land use and land cover. The watershed characteristic rating includes average annual precipitation, land surface slope, land use, land cover and groundwater contribution.

The SWAP program has planned for updates to the initial ratings as conditions change and new data sources become available. The initial data used to calculate the unsaturated zone ratings and watershed characteristics ratings were compiled from sources from the late 1990's. Critical data layers have been updated since the ratings were calculated. These improved data layers need to be used in the ongoing update of the susceptibility ratings.

Overlay and index methods for rating susceptibility to contamination
of the unsaturated zone for ground-water suppplies, and watershed
characteristics for surface-water supplies were derived for use
by the State of North Carolina in assessing more than 11,000 public
water-supply wells and approximately 245 public surface-water intakes.
Factors that influence the inherent vulnerability of ground water and
surface water were selected and assigned ratings on a scale of 1 to 10.
These factors were then assigned weight to reflect their relative influence
on inherent vulnerability and the reliability of the data.  The
values for each factor were obtained from geographic information
system (GIS) data layers that were transformed into ARC/INFO
raster data sets known as grids. These raster data sets have
30-meter by 30-meter cells, and each cell is assigned a weighted-
factor value.

Limitations --

The overlay and index methods of unsaturated zone and watershed
characteristics ratings are broad-stroke methods that assess
vulnerability on the basis of expert opinion. The methods aslo have
limitations in the age and scale of the hydrologic and geographic
data. But the most significant limitation of the methods used
is that no statistical confirmation of the results have been
performed.

VERTICAL SERIES HYDRAULIC CONDUCTANCE:

The vertical series hydraulic conductance (also referred to as conductance) layer is calculated for the entire thickness of the unsaturated zone. The entire thickness of the unsaturated zone includes a soil layer, and may include a saprolite and crystalline bedrock layer depending on the depth to water at any point. To calculate the conductance value, thickness of soils, depth to bedrock and soil conductance are necessary. The conductance of the saprolite and bedrock layers are also needed.

County-level soil information from the Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database (SSURGO) database for North Carolina was used where available. The SSURGO data provides an estimate for conductance of the soil layer, thickness of the soil layer, and depth to the bedrock of a soil layer. This was combined with the depth to water layer, and the conductance values for saprolite and bedrock that were created for the 2000 compilation of conductance. Detailed soils were available for 73 counties in the 2000 release of the data. For the update of the conductance layer, twenty additional detailed soil surveys were available to refine the conductance of the soil layer statewide.

SSURGO data for Anson, Avery, Buncombe, Burke, Catawba, Chatham, Clay, Cleveland, Graham, Henderson, Lee, Lincoln, Madison, Montgomery, Stokes, Surry, Transylvania, Vance, Watauga, Yadkin and part of Haywood County were included in this update. The counties of Caswell, Cherokee, Iredell, Rowan, Rutherford, Swain, and Warren were not available at the time of processing.  The less detailed State Soil Geographic (STATSGO) database was used in these counties.

In 2004, NRCS implemented a  new database and access system to the SSURGO spatial and tabular data. Because of this, methods developed in 2000 for the original compilation of unsaturated zone data were modified. The fields from the SSURGO soils database used in 2000 were no longer available. Permeability of soil fields, PERML and PERMH, have been replaced by Ksat in the SSURGO database. The SSURGO Metadata table column descriptions define Ksat as ?the amount of water that would move vertically through a unit area of saturated soil in unit time under unit hydraulic gradient.? (http://soils.usda.gov/survey/geography/ssurgo/). Verbal communication with Soil Scientists at NRCS confirmed that the Ksat variable should be used as a substitute for perml and permh (cite, date). The NRCS also distributes software to calculate one Ksat value per soil type, as a weighted average over the soil layers. This value for each soil is multiplied by .1417 to convert it to an inch per hour ratio, comparable to the values used in 2000.

Soil thickness and depth to bedrock were also updated from the SSURGO data for the 21 counties that were updated. New conductance values were calculated separately for the new county data, and merged with the 2000 layer.
One additional change was made from the 2000 compilation. The categories were rescaled to better represent the conductance through a smaller area represented by a 30 by 30 foot cell size. The new categories and ratings for Vertical series hydraulic conductance are:

>Table 1 -- Vertical series hydraulic conductance categories and rating values for unsaturated zone rating

> Vertical series hydraulic             Percent of area                Rating
> conductance categories                in North Carolina
> (feet-squared per day)
>  <= 50                                    33                         1
>  > 50 to <=  100                          14                         2
>  >100 to <= 200                            9                         3
>  >200 to <= 400                           11                         4
>  >400 to <=800                             8                         5
>  >800 to <= 1,600                          3                         6
>  >1,600 to <= 3,200                        3                         7
>  >3,200 to <= 6,400                        5                         8
>  >6,400 to <= 12,800                       2                         9
>  >12,800                                  12                        10

SELECTED REFERENCES:

Eimers, J. L., Weaver, J. C., Terziotti, S., and Midgette, R. W.,
2000, Methods of rating unsaturated zone and watershed
characteristics of public water supplies in North Carolina: U. S.
Geological Survey Water-Resources Investigations Report 99-4283,
31 p.

North Carolina Department of Environment and Natural Resources,
1999, North Carolina source water assessment program plan: Raleigh,
North Carolina Department of Environment and Natural Resources,
Division of Environmental Health, Public Water Supply Section,
[variously paged].

O'Hara, C. G., 1994, Permeability of soils in Mississippi:
U.S. Geological Survey Water-Resources Investigations Report
94-4088, 1 sheet.

O'Hara, C.G., 1996, Susceptibility of ground water to surface
and shallow sources of contamination in Mississippi: U.S.
Geological Survey Hydrologic Investigations Atlas HA-739, 4 sheets.

More information on STATSGO, SSURGO, and the MUIR database can be
found at the USDA-NRCS, National Soils Survey Center, National Soil
Data Access Facility website,
http://soils.usda.gov/

STATSGO data can be accessed from:
http://soils.usda.gov/survey/geography/statsgo/

Information on the SSURGO data available through NC Center
for Geographic Information and Analysis can be viewed
at: http://cgia.cgia.state.nc.us/corpmeta.dir/corplayer.html

NRCS has all certified SSURGO data online at:
http://soildatamart.nrcs.usda.gov/Default.aspx

NRCS distributes a Soil Data Viewer for ArcGIS applications, used to display and aggregate soil properties by soil unit.
http://soildataviewer.nrcs.usda.gov/download50.aspx

Any use of trade, product, or firm names is for descriptive purposes
only and does not imply endorsement by the
U.S. Government.

Although this Federal Geographic Data Committee-compliant metadata
file is intended to document the data set in nonproprietary form,
as well as in ARC/INFO format, this metadata file may include some
ARC/INFO-specific terminology.

*Language of dataset: en

Time period of content:

Time period information:

Single date/time:

Calendar date: 1990

Currentness reference:

ground condition

Status:

Progress: In work

Maintenance and update frequency: As needed

Spatial domain:

Bounding coordinates:

*West bounding coordinate: -84.901283

*East bounding coordinate: -74.884006

*North bounding coordinate: 36.982818

*South bounding coordinate: 33.256483

Local bounding coordinates:

*Left bounding coordinate: 83406.419070

*Right bounding coordinate: 976386.419070

*Top bounding coordinate: 358675.256043

*Bottom bounding coordinate: -39784.743957

Keywords:

Theme:

Theme keywords: Vertical Series Hydraulic Conductance, Soils, Permeability, Vulnerability

Theme keyword thesaurus: none

Place:

Place keywords: North Carolina

Place keyword thesaurus: none

Access constraints: none

Use constraints:

Not to be used for site-specific analysis

Point of contact:

Contact information:

Contact person primary:

Contact person: Silvia Terziotti

Contact organization: U.S. Geological Survey

Contact position: Computer Specialist

Contact address:

Address type: mailing address

Address:

3916 Sunset Ridge Road

City: Raleigh

State or province: NC

Postal code: 27607

Country: USA

Contact voice telephone: (919) 571-4000

Contact facsimile telephone: (919) 571-4041

Contact electronic mail address: (seterzio@usgs.gov)

Data set credit:

The authors are grateful to colleagues in the Public Water Supply
Section of the Division of Environmental Health, North Carolina
Department of Environment and Natural Resources (DENR) for their
assistance in this collaborative project: thanks to Robert Midgette,
Protection and Enforcement Branch Head; Amy Axon,hydrogeologist - Source Water Protection; and David Hammermann, Geographic Information Systems Specialist.

The authors also thank the USGS report review team for their review of
the update procedures: Jeanne Robbins, Surface-water Specialist; Melinda Chapman, Ground-water Specialist; Mary Giorgino, Water-quality Specialist; and Douglas Harned, ALBE-National Water Quality Assessment Project Chief

*Native dataset format: Raster Dataset

*Native data set environment:

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.6.1500

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Watershed Characteristics Rating for North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-490

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01490/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Unsaturated Zone Characteristics Rating for North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-489

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01489/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Land-Use Classes to Characterize Watersheds and the Unsaturated Zone in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-493

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01493/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Land-Cover Classes to Characterize the Unsaturated Zone in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-491

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01491/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Percent-Slope Classes to Characterize the Unsaturated Zone in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-495

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01495/index.html

Cross reference:

Citation information:

Originators: Jo Leslie Eimers, Silvia Terziotti and Gloria Ferrell

Title:

Vertical Series Hydraulic Conductance Classes to Characterize the Unsaturated Zone in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-486

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01486/index.html

Cross reference:

Citation information:

Originators: Jo Leslie Eimers, Silvia Terziotti and Mary Giorgino

Title:

Estimated Depth to Water, North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-487

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01487/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Land-Cover Classes to Characterize Watersheds in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-492

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01492/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Average Annual Precipitation Classes to Characterize Watersheds in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-494

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01494/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Percent-Slope Classes to Characterize Watersheds in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-496

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01496/index.html

Cross reference:

Citation information:

Originators: Silvia Terziotti and Jo Leslie Eimers

Title:

Ground-Water Contribution Classes to Characterize Watersheds in North Carolina

Publication date: 2001

Geospatial data presentation form: map

Series information:

Series name: USGS Open-File Report

Issue identification: USGS OFR 01-488

Publication information:

Publication place: Raleigh, NC

Publisher: USGS

Online linkage: http://nc.water.usgs.gov/reports/ofr01488/index.html

Data Quality Information:

Attribute accuracy:

Attribute accuracy report:

Visually verified against original source

Logical consistency report:

Not applicable for raster data.

Completeness report:

Best scale available was used. 1:24,000 was used, and
filled in with 1:250,000 scale soils.

Positional accuracy:

Horizontal positional accuracy:

Horizontal positional accuracy report:

Based on source data, 1:24,000 or 1:250,000 scale

Lineage:

Source information:

Source citation:

Citation information:

Originators: NRCS

Title:

State Soil Geographic (STATSGO) data base for North Carolina

Publication date: 1994

Geospatial data presentation form: map

Publication information:

Publication place: Fort Worth, TX

Publisher: U.S. Department of Agriculture, NRCS

Source scale denominator: 250,000

Type of source media: stable-base material

Source citation abbreviation:

None

Source contribution:

permeability and soil thickness

Source time period of content:

Time period information:

Single date/time:

Calendar date: unknown

Source currentness reference:

Photography date

Source information:

Source citation:

Citation information:

Originators: NCCGIA

Title:

Detailed County Soils- various counties, North Carolina

Publication date: 1998

Geospatial data presentation form: map

Publication information:

Publication place: Raleigh, NC

Publisher: NCCGIA

Source scale denominator: 24,000

Type of source media: stable-base material

Source citation abbreviation:

None

Source contribution:

permeability and soil thickness

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1950's to present

Source currentness reference:

Photography date

Source information:

Source citation:

Citation information:

Originators: NRCS

Title:

Detailed County Soils- various counties, North Carolina

Publication date: 2009

Geospatial data presentation form: map

Publication information:

Publication place: Raleigh, NC

Publisher: NRCS

Source scale denominator: 24,000

Type of source media: stable-base material

Source citation abbreviation:

None

Source contribution:

Ksat, soil thickness and depth to bedrock

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1950's to present

Source currentness reference:

Photography date

Source information:

Source citation:

Citation information:

Originators: Amoozegar, A., Hoover, M. T., Kleiss, H. J., Guertal, W. R., Surbrugg, J. E.

Title:

Evaluation of saprolite for on-site wastewater disposal

Publication date: 1993

Series information:

Series name: Water Resources Research Institute Report

Issue identification: No. 279

Type of source media: paper

Source citation abbreviation:

Amoozegar and others (1993)

Source contribution:

saprolite characteristics

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1993

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Amoozegar, A., Schoeneberger, P. J., Vepraskas, M. J.

Title:

Characterization of soils and saprolites from the Piedmont region for waste disposal purposes

Publication date: 1991

Series information:

Series name: Water Resources Research Institute Report

Issue identification: No. 255

Type of source media: paper

Source citation abbreviation:

Amoozegar and others (1991)

Source contribution:

saprolite characteristics

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1991

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Ator, S.W., Denver, J.M., Hancock, T.C.

Title:

Relating shallow Ground-water quality to surficial hydrogeology in the mid-Atlantic coastal plain

Publication date: 2000

Series information:

Series name: National Water Quality Monitoring Conference, Monitoring for the Millennium Proceedings

Issue identification: Proceedings, 2000

Type of source media: paper

Source citation abbreviation:

Ator and others (2000)

Source contribution:

p. 409-423

Source time period of content:

Time period information:

Single date/time:

Calendar date: 2000

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Hazen, Allen

Title:

Discussion

Publication date: 1911

Series information:

Series name: Dams on sand foundations. Transactions, American Society of Civil Engineers

Issue identification: vol. 73

Type of source media: paper

Source citation abbreviation:

Hazen (1911)

Source contribution:

p. 199

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1911

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Moench, A.F.

Title:

Computation of type curves for flow to partially penetrating wells in water-table aquifers.

Publication date: 1993

Series information:

Series name: Ground Water

Issue identification: 34(4)

Type of source media: paper

Source citation abbreviation:

Moench (1993)

Source contribution:

p. 593-96.

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1993

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Neuman, S.P.

Title:

Flow to a well of finite diameter in a homogeneous, anisotropic water table aquifer.

Publication date: 1997

Series information:

Series name: Water Resources Research

Issue identification: 33(6)

Type of source media: paper

Source citation abbreviation:

Neuman (1997)

Source contribution:

p. 1397-1407

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1997

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: O'Hara, C. G.

Title:

Permeability of soils in Mississippi

Publication date: 1994

Series information:

Series name: U.S. Geological Survey Water-Resources Investigations

Issue identification: WRIR 94-4088

Type of source media: paper

Source citation abbreviation:

O'Hara (1994)

Source contribution:

methods

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1994

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: O'Hara, C.G.

Title:

Susceptibility of ground water to surface and shallow sources of contamination in Mississippi

Publication date: 1996

Series information:

Series name: U.S. Geological Survey Hydrologic Investigations Atlas

Issue identification: HA-739

Type of source media: paper

Source citation abbreviation:

O'Hara (1996)

Source contribution:

methods

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1996

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Trapp, H., Jr., Horn, M. A.

Title:

Ground water atlas of the United States, Segment 11, Delaware, Maryland, New Jersey, North Carolina, Pennsylvania, Virginia, West Virginia

Publication date: 1997

Series information:

Series name: Hydrologic Investigations Atlas

Issue identification: 730-L

Type of source media: paper

Source citation abbreviation:

Trapp and Horn (1997)

Source contribution:

generalized geology

Source time period of content:

Time period information:

Single date/time:

Calendar date: 1997

Source currentness reference:

publication date

Source information:

Source citation:

Citation information:

Originators: Eimers, J. L., Weaver, J. C., Terziotti, S., Midgette, R. W.

Title:

Methods of rating unsaturated zone and watershed characteristics of public water supplies in North Carolina

Publication date: 2000

Series information:

Series name: U. S. Geological Survey Water-Resources Investigations

Issue identification: WRIR 99-4283

Type of source media: paper

Source citation abbreviation:

Eimers and others (2000)

Source contribution:

methods for applying ratings

Source time period of content:

Time period information:

Single date/time:

Calendar date: 2000

Source currentness reference:

publication date

Process step:

Process description:

Several new counties were added to the dataset; Anson, Avery, Buncombe, Burke, Catawba, Chatham, Clay, Cleveland, Graham, Henderson, Lee, Lincoln, Madison, Montgomery, Stokes, Surry, Transylvania, Vance, Watauga, Yadkin and part of Haywood County were included in this update

Process date: 200905

Process step:

Process description:

Using the NRCS Soil Data Viewer 5.0, Load each county soil shapefile and database into the viewer.

Process date: 200905

Process step:

Process description:

For each new county, open the Soil Physical Properties Attribute Folder, and choose saturated Hydraulic Conductivity (Ksat) for analysis

Process date: 200905

Process step:

Process description:

As the Rating Option, Choose Weiighted Average aggregation method, and use the Dept Range of 0 to 100 inches. Choose MAP to display within ArcMap session.

Process date: 200905

Process step:

Process description:

Open the table and export it as a dbf table that contains the Musym and Ksat values for each county

Process date: 200905

Process step:

Process description:

Add a new field to the Ksat table, Ksat_inhr, and calculate it equal to Ksat * .1417 to convert it from um/s to in/hr

Process date: 200905

Process step:

Process description:

Join the tables to the shapefiles, and convert each county to a grid with Ksat_inhr as the value for the grid. Merge all new counties.

Process date: 200905

Process step:

Process description:

Do similar processes for soil thickness and depth to bedrock for the new counties.

Process date: 200905

Process step:

Process description:

Calculate the new conductivity values for the new counties, substituting in Ksat for HMP.

Process date: 200905

Process step:

Process description:

merge the new conductance grid with the old grid conductance grid so that the new values replace the old one. The areas outside of the new counties will retain the original values of the old conductance grid.

Process date: 200905

Process step:

Process description:

Remap the conductance grid into categories using the following
remap table (Using the ARC/INFO command, SLICE, with the TABLE
option):
>50 :  1
>100 : 2
>200 : 3
>400 : 4
>800 : 5
>1600 : 6
>3200 : 7
>6400 : 8
>12800 : 9
>100000 : 10
>

Process date: 200905

Process step:

Process description:

First draft of metadata created by seterzio using
FGDCMETA.AML ver. 1.33 07/15/99 on ARC/INFO data set
h:\conductance\condgw

Process date: 200905

Process step:

Process description:

Metadata imported.

Process date: 200905

Source used citation abbreviation:

W:\SWAP_updates\FinalLayers\condgw

Process step:

Process description:

Metadata imported.

Source used citation abbreviation:

W:\SWAP_updates\Documents\Metadata\condgw.xml

Spatial Data Organization Information:

*Direct spatial reference method: Raster

Raster object information:

*Image format:

*Number of bands: 1

*Row count: 13282

*Column count: 29766

*Vertical count: 1

*Cell size X direction: 30.000000

*Cell size Y direction: 30.000000

*Bits per pixel: 8

*Pyramid layers: FALSE

*Image colormap: FALSE

*Compression type: Default

*Raster object type: Grid Cell

*Raster display type: matrix values

*Raster origin: Upper Left

Spatial Reference Information:

Horizontal coordinate system definition:

Coordinate system name:

*Projected coordinate system name: NAD_1983_StatePlane_North_Carolina_FIPS_3200

*Geographic coordinate system name: GCS_North_American_1983

Planar:

Grid coordinate system:

*Grid coordinate system name: State Plane Coordinate System 1983

State Plane Coordinate System:

*SPCS zone identifier: 3200

Lambert conformal conic:

*Standard parallel: 34.333333

*Standard parallel: 36.166667

*Longitude of central meridian: -79.000000

*Latitude of projection origin: 33.750000

*False easting: 609601.220000

*False northing: 0.000000

Planar coordinate information:

*Planar coordinate encoding method: row and column

Coordinate representation:

*Abscissa resolution: 30.000000

*Ordinate resolution: 30.000000

*Planar distance units: meters

Geodetic model:

*Horizontal datum name: North American Datum of 1983

*Ellipsoid name: Geodetic Reference System 80

*Semi-major axis: 6378137.000000

*Denominator of flattening ratio: 298.257222

Entity and Attribute Information:

Detailed description:

*Name: condgw.vat

Entity type:

*Entity type label: condgw.vat

*Entity type type: Table

*Entity type count: 10

Attribute:

Attribute label: Rowid

Attribute definition:

Internal feature number.

Attribute definition source:

ESRI

Attribute domain values:

Unrepresentable domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute label: VALUE

Attribute:

Attribute label: COUNT

Overview description:

Entity and attribute overview:

>
>Value Attribute Table, SOILSGW.VAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  VALUE                  4    10     B      -
>    5  COUNT                  4    10     B      -
>    9  PCT_TOT                4     8     F      2
>   13  SQMI                   4     8     F      2
>
VALUE is the rating: valid values are integers 1 to 10, inclusive
COUNT is the number of 30-meter by 30-meter cells in the entire data
set that have the value.
PCT_TOT is the percent of the total area JUST FOR the North Carolina portion of the study area
SQMI area in square miles for that category WITHIN NORTH CAROLINA
>
>list condgw.vat
>VALUE      COUNT  PCT_TOT     SQMI
>1       51100160    33.00 17756.81
>2       21891965    14.14  7607.24
>3       13801470     8.91  4795.88
>4       16552914    10.69  5751.98
>5       12036342     7.77  4182.51
>6        4644788     3.00  1614.02
>7        4811959     3.11  1672.11
>8        7653977     4.94  2659.68
>9        3498085     2.26  1215.55
>10      18850175    12.17  6550.25
>
MIN is the minimum value (1 at the least)
MAX is the maximum value (10 at the most)
MEAN is the average value
STDV is the standard deviation
>
>Statistics Summary Table, SOILSGW.STA:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  MIN                    8    15     F      3
>    9  MAX                    8    15     F      3
>   17  MEAN                   8    15     F      3
>   25  STDV                   8    15     F      3
>
>list condgw.sta
>Record            MIN             MAX            MEAN            STDV
>     1           1.000          10.000           3.910           3.136
>

Entity and attribute detail citation:

none

Distribution Information:

Distributor:

Contact information:

Contact organization primary:

Contact organization: U.S. Geological Survey

Contact position: Information Officer

Contact address:

Address type: mailing and physical address

Address:

3916 Sunset Ridge Rd.

City: Raleigh

State or province: NC

Postal code: 27607

Country: USA

Contact voice telephone: (919) 571-4000

Contact electronic mail address: gs-w-ncrlg_www@usgs.gov

Contact instructions:

Contact via email

Resource description: Downloadable Data

Distribution liability:

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 this data, software, or related materials.

Standard order process:

Digital form:

Digital transfer information:

*Transfer size: 31.200

*Dataset size: 31.200

Metadata Reference Information:

*Metadata date: 20090702

Metadata review date: 2001

*Language of metadata: en

Metadata contact:

Contact information:

Contact organization primary:

Contact person: North Carolina Water Science Center Director

Contact organization: U.S. Geological Survey

Contact position: Director

Contact address:

Address type: mailing and physical address

Address:

3916 Sunset Ridge Road

City: Raleigh

State or province: NC

Postal code: 27607

Country: USA

Contact voice telephone: (919) 571-4000

Contact facsimile telephone: (919) 571-4041

Contact electronic mail address: dc_nc@usgs.gov

*Metadata standard name: FGDC Content Standards for Digital Geospatial Metadata

*Metadata standard version: FGDC-STD-001-1998

*Metadata time convention: local time

Metadata access constraints: none

Metadata use constraints:

none

Metadata extensions:

Online linkage: http://www.esri.com/metadata/esriprof80.html

Profile name: ESRI Metadata Profile

Metadata extensions:

*Online linkage: http://www.esri.com/metadata/esriprof80.html

*Profile name: ESRI Metadata Profile

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