20240627
13144700
1.0
FALSE
002
GroundwaterFeaturesChatham_Lines
558219.573700
620924.807400
194132.149200
235764.750100
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_StatePlane_North_Carolina_FIPS_3200
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ItemDescription
dataset
Michael Medina
North Carolina Geological Survey
Environmental Specialist I
Raleigh
NC
27604-1148
919.707.9203
20240625
File Geodatabase Feature Class
This feature class contains line that depict the distribution of Groundwater Features Groundwater on the Features Map of Chatham County.
Inferred diabase dike – A line representing the interpreted location of a diabase dike is provided when the distribution of diabase points and/or topography implies the presence of a mappable dike. The location of the line is an approximation and should be confirmed by a site-specific field investigation. The orientation of diabase dikes can vary. Most are near-vertical, but some have dips as low as 45 degrees have been observed. As such, the surface trace does not necessarily match the subsurface location. When attempting to intersect a diabase dike to improve potential well yield, knowledge of the subsurface orientation of the diabase dike is needed. Diabase dikes can dip in any direction. Inferred brittle fault - A line representing the interpreted location of a brittle fault is provided when geologic units abruptly end (truncated) and/or topography implies the presence of a mappable fault. The location of the line is an approximation and should be confirmed by a site-specific field investigation. On the map, a fault is designated as a line; however, a fault will have a zone of fractured rock on either side of the fault line – called a fault zone or damage zone. Faults can vary widely in length and width. Major brittle faults can extend for miles and have fault zones that are 100’s to 1000’s of feet wide. Smaller faults can extend for inches to 100’s of feet. The general rule-of-thumb is an area that has a brittle fault is likely to have more fractures in the bedrock than a location away from the fault. Also, there is typically a decrease in the intensity of bedrock fractures as one moves farther away from the fault.
Linear geomorphic feature interpreted from hillshade LiDAR - A lineament is a linear (relatively straight) topographic feature. A naturally occurring lineament usually reflects characteristics of the underlying rocks. LiDAR elevation data for Chatham County became available in ca. 2007. LiDAR (Light Detection And Ranging) elevation data is acquired using an airplane-mounted laser transmitter that measures very accurate elevation data. This data set has revealed an extraordinary network of lineaments that are parallel to diabase dikes and known orientations of brittle faults. Some of these lineaments can be traced for multiple miles across Chatham County. The lineaments are interpreted to be likely fracture zones; however, field observations could not confirm the presence of each potential brittle fault.
The map area has hundreds of lineaments when viewed at varying scales. Only the major lineaments that are easily visible at 50,000- to 100,000-scale are identified on the Groundwater Features Map. Like brittle faults, lineaments can widely vary in length and width. Major lineaments extend for miles and have linear topographic expressions that are 100’s to greater than 500 feet wide in some locations.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This feature class contains lines that depict the distribution of Groundwater Features Groundwater Features on the Groundwater Features Map of Chatham County.</SPAN></P></DIV></DIV></DIV>
This digital database was prepared by the North Carolina Geological Survey. Bradley, P.J. and Bolich, R.E., 2022, Groundwater features map of Chatham County and surrounding areas, North Carolina: North Carolina Geological Survey Open-file Report 2022-04, scale 1:50,000, in color.
Groundwater Features Map of Chatham County - Lines
2021-06-30T00:00:00
Phil Bradley
North Carolina Geological Survey
Senior Piedmont Geologist
pbradley@ncdenr.gov
919.707.9241
Michael Medina
North Carolina Geological Survey
Environmental Specialist I
512 N. Salisbury St., Rm. 527
Raleigh
NC
27602-1148
Michael.Medina@ncdenr.gov
919.707.9203
Groundwater Features
digital compilation
North Carolina
Chatham County
NC DEQ
DEMLR
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Not for use at scales larger than 1:24,000 or at scales larger than the LocationConfidenceMeters field. Refer to field name: LocationConfidenceMeters in each featureclass for numerical value of approximate location confidence. </SPAN></SPAN><SPAN><SPAN>The North Carolina Geological Survey (NCGS) is committed to offering its users accurate, useful, and current information. Although every effort has been made to ensure the accuracy of information it provides, the NCGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. The information contained in these data is dynamic and may change over time. Earlier versions of this data set may exist. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. </SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The NCGS gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are acquired directly from an NCGS source and not indirectly through other sources which may have modified the data in some way. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>Although these data have been processed successfully on computer systems at the NCGS, no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. The use of trade names or commercial products does not constitute their endorsement by the NCGS.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
-84.3200
-75.4600
36.5700
33.8400
1
Unknown
2021-03-05T00:00:00
2021-06-30T00:00:00
Esri ArcGIS 13.1.3.41833
This is a creation of Chatham County geology metadata.
2284
EPSG
4.2(3.0.1)
GroundwaterFeaturesChatham_Lines
Feature Class
2284
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
Type
Type
String
254
0
0
IsConcealed
IsConcealed
String
1
0
0
LocationConfidenceMeters
LocationConfidenceMeters
Single
4
0
0
ExistenceConfidence
ExistenceConfidence
String
50
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
IdentityConfidence
IdentityConfidence
String
50
0
0
Label
Label
String
50
0
0
Symbol
Symbol
String
254
0
0
DataSourceID
DataSourceID
String
50
0
0
ContactsAndFaults_ID
ContactsAndFaults_ID
String
50
0
0
Notes
Notes
String
254
0
0
created_user
created_user
String
255
0
0
created_date
created_date
Date
8
0
0
last_edited_user
last_edited_user
String
255
0
0
last_edited_date
last_edited_date
Date
8
0
0
Simple
FALSE
2284
TRUE
FALSE