The North Carolina Department of Environment and Natural Resources, Division of Water Quality, in cooperation with the NC Center for Geographic Information and Analysis, developed the digital Water Supply Watersheds data to enhance planning, siting and impact analysis in areas directly affecting water supply intakes. This file outlines the extent of protected and critical areas and stream classifications for areas around water supply watersheds in which development directly affects a water supply intake. This file enables users to identify the areas which have special restrictions for building and development based on water supply intakes. This file is updated as changes occur.
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
>system filename : wsw file size = 5.07 mb > >Revisions and updates to this layer include: >36.) filename: water_supply_watersheds20061012 The October 12, 2006 update: >A) Critical Area Boundary added for Town of Elkin water intake >B) Watersupply Watershed Boundary removed for He Creek, Jerry Branch, and Henry Fork areas >due to reclassification to WS-V >35.) filename: wsw105 The January 31, 2005 update: >A) Critical Area Boundary corrected for the Rocky River watershed. >This affects the Crutchfield Crossroads 24k quad. >34.) filename: wsw804 The August 6, 2004 update: >A) Addition of Neuse River (Wake Forest) watershed. This affects the >Franklinton, Grissom, Rolesville, and Wake Forest 24k quads. >B) Addition of Fantasy Lake (Rolesville) watershed. This affects the >Rolesville 24k quad. >33.) filename: wsw103 The January 31, 2003 update: >A) Addition of Killets Creek watershed. This affects the Carthage >24k quad. >32.) filename: wsw802 The August 2, 2002 update: >A) Critical Area Boundary extended for the Hiwassee River (Murphy) >watershed. This affects the Peachtree 24k quad. >B) Addition of Neuse River (Lenoir County) watershed. This affects the >Deep Run, La Grange, and Seven Springs 24k quads. >31.) filename: wsw601 The June 27, 2001 update: >A) Critical Area Boundary corrected for the Hiwassee River (Murphy) >watershed. This affects the Peachtree 24k quad. >30.) filename: wsw401 The April 11, 2001 update: >A) The class for the Fuller Creek watershed changed from WS-II to WS-III. >This affects the Yanceyville 24k quad. >B) Boundary corrected between the Nicks Creek watershed and the Little >River (Intake #2) watershed. This affects the Southern Pines 24k quad. >29.) filename: wsw1000 The October 24, 2000 update: >A) Correction made to the critical area for the Country Line Creek watershed. >This affects the Anderson, Cherry Grove, Park Spring, and Yanceyville >24k quads. >28.) filename: wsw800 The August 7, 2000 update: >A) Correction made to the critical area for the Mayo River watershed. This >update affects the Mayodan 24k quad. >27.) filename: wsw600 The June 14, 2000 update: >A) Correction made to the critical area for the Lake Norman watershed. This >update affects the Lake Norman North 24k quad. >B) 'Donut hole' polygon removed that should have been deleted when >the protected area boundary for Catawba River (Morganton) watershed >was modified. This update affects the Oak Hill 24k quad. > >NOTE: FOR DETAILS ON THE FOLLOWING PRIOR UPDATES, >REFER TO THE METADATA WITH THE 3/26/99 FILE. >26.) filename: wsw399 The March 26, 1999 update >25.) filename: wsw898 The August 20, 1998 update was the first >83, state plane, meters version >24.) filename: wsw697 The June 19, 1997 update >23.) filename: wsw597 The May 5, 1997 update >22.) filename: wsw297 The February 18, 1997 update > >NOTE: FOR DETAILS ON THE FOLLOWING PRIOR UPDATES, >REFER TO THE METADATA WITH THE 10/28/96 FILE. >21.) filename: wsw1096 The October 28, 1996 update >20.) filename: wsw61396 The June 13, 1996 update >19.) filename: wsw41296 The April 12, 1996 update >18.) filename: wsw496 The April 1, 1996 update >17.) filename: wsw396 The March 6, 1996 update >16.) filename: wsw196 The January 25, 1996 update >15.) filename: wsw695 (previously called nc.wsw695) >The June 30, 1995 update >14.) filename: wsw595 (previously called nc.wsw595) >The May 4, 1995 update >13.) filename: wsw195 (previously called nc.wsw195) >The January 13, 1995 update >12.) filename: wsw1194 (previously called nc.wsw1194) >The November 4, 1994 update >11.) filename: wsw994 (previously called nc.wsw994) >The September 13, 1994 update >10.) filename: wsw894 (previously called nc.wsw894) >The August 26, 1994 update >9.) filename: wsw594 (previously called nc.wsw594) >The May 18, 1994 update >8.) filename: wsw494 (previously called nc.wsw494) >The April 28, 1994 update >7.) filename: wsw194 (previously called nc.wsw194) >The January 12, 1994 update >6.) filename: wsw102893 (previously called nc.wsw102893) >The October 28, 1993 update >5.) filename: wsw101593 (previously called nc.wsw101593) >The October 15, 1993 update >4.) filename: NOT ARCHIVED The September 8, 1993 update >3.) filename: wsw193 The January 22, 1993 update >2.) filename: NOT ARCHIVED The November 17, 1992 update >1.) filename: ncpcarvold (previously called nc.pcarv.old) >(protected/critical area with the same state lake as the .coe >coverage, but this version was interpreted from USGS maps) >filename: ncpcarvcoe (previously called nc.pcarv.coe) >(protected/critical area with the Army Corp of Engineers >version of a state lake) >filename: ncpcarv (previously called nc.pcarv) >Previous to August 1992, this file >was called Public Water Supply watersheds and only >included WS-I, WS-II, WS-III classifications. >filename: ncpca (previously called nc.pca) >filename: ncpca2 (previously called nc.pca2)
Data creation and revision dates
Acknowledgement of products derived from this data set should cite the following: The source of the Water Supply Watersheds data is the North Carolina Corporate Geographic Database. Earlier versions of this dataset may exist. The user must be sure to use the appropriate data set for the time period of interest. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CGIA cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.
512 N. Salisbury Street
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>Div. of Water Quality Director, Alan Klimek >Planning Section, Alan Clark >Classifications and Standards Unit Supervisor, Jeff Manning >NC Dept. of Environment and Natural Resources >512 N. Salisbury Street >Raleigh, NC 27604-1148
The NC DENR-Division of Water Quality delineated the boundaries on 24k USGS paper topographic maps. NCCGIA digitized these boundaries and attributed them with DWQ classification information, river basin and stream names, and acres per polygon. The digital files were plotted and overlayed to the originals and linework and label corrections were made. This digital file is updated as changes occur.
Using ESRI's ARC/INFO GIS software, the dataset was built for arc and polygon topology using the "build" command. The data set was then cleaned with a fuzzy tolerance of 1 foot. Topology has not been edited since the last build or clean.
These data represent the locations and identities of Water Supply Watersheds in North Carolina as mapped by the NCDWQ. Each watershed is labeled with either a protected or critical area classification. All boundaries are approved by DWQ whether they are the original DWQ boundaries or changes to original boundaries submitted for revision by local or county governments.
Water supply watershed boundaries were marked on 7.5 Minute USGS paper topographic maps which meet National Map Accuracy Standards, using a best estimate with reference to surrounding features. Ridge lines were interpolated from contours by cartographers and reviewed by DWQ staff. Counties and municipalities have restudied certain boundaries in detail for adjustment by DWQ. Boundaries drawn were digitized and check plots used to ensure correct boundary location, within a line width. map units: meters, precision: single, fuzzy: 1.0, dangle: 0.2
Water supply watershed boundaries and stream classification schedules
Paper maps used to delineate the watersheds
Digitization of the boundaries, and file updates.
Water supply watershed boundaries were delineated by cartographers interpolating ridgelines on paper USGS 7.5 minute topographic maps. Boundaries were delineated around known water supply intakes. Intakes on streams or rivers had critical areas delineated as ridgelines or half mile buffers, whichever was closest, upstream of the intake location. Protected areas were delineated with ridgelines or ten mile buffers, which ever was closer. For intakes on lakes and reservoirs, buffers were delineated from the apparent pool elevation of the water body as shown on the USGS quadrangle using the same limits as above. Boundaries were reviewed by DWQ staff. After the linework was digitized by NCCGIA (see below), DWQ staff reviewed the linework and attributes for accuracy. DWQ supplies CGIA with updates as they occur.
512 N. Salisbury Street
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Water supply watersheds were digitized from hand delineated water supply watershed boundaries on USGS 7.5 Minute series paper basemaps. The digital files were attributed and checkplots were created for review by the Water Quality Section. Necessary corrections were made and new plots were run. Post processing involved edgematching and mapjoining of USGS 7.5 Minute series maps used to create the digitized data. This process generated one statewide polygon coverage. Boundaries of the watersheds throughout the state, in an effort to have them coincident with the Hydrologic Units adopted earlier by ENR-DWQ and USDA-NRCS, were replaced with the hydrologic units Boundaries for the watersheds. Boundaries coincident in both coverages were deleted from the watershed file and copied back from the hydrologic units file. CGIA updates the digital file as needed.
301 North Wilmington Street, Suite 700
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Dataset copied.
Total perimeter in coverage units
Software computed
DWQ stream classification for watershed
NC DENR-Div of Water Quality, (Water Quality Planning Section)
Waters protected as water supplies which are in natural and undeveloped watersheds
NC DENR-Div of Water Quality (Water Quality Planning Section)
Waters protected as water supplies which are generally in predominantly undeveloped watersheds
NC DENR-Div of Water Quality (Water Quality Planning Section)
Waters protected as water supplies which are generally in low to moderately developed watersheds
NC DENR-Div of Water Quality (Water Quality Planning Section)
Waters protected as water supplies which are generally in moderately to highly developed watersheds
NC DENR-Div of Water Quality (Water Quality Planning Section)
Suitable for natural trout propagation and maintenance of stocked trout
NC DENR-Div of Water Quality (Water Quality Planning Section)
High Quality Waters which are waters that are rated as excellent based on biological and physical/chemical characteristics through division monitoring or special studies; native and special native trout waters (and their tributaries) designated by the Wildlife Resources Commission; primary nursery areas (PNA) designated by the Marine Fisheries Commission and other functional nursery areas designated by the Wildlife Resources Commission; critical habitat areas designated by the Wildlife Resources Commission or the Department of Agriculture; all water supply watersheds which are either classified as WS-I or WS-II or those for which a formal petition for reclassification as WS-I or WS-II has been received from the appropriate local government and accepted by the Division of Environmental Management; and all Class SA waters.
NC DENR-Div of Water Quality (Water Quality Planning Section)
Nutrient Sensitive Waters which require limitations on nutrient inputs
NC DENR-Div of Water Quality (Water Quality Planning Section)
Outstanding Resource Waters which are unique and special waters of exceptional state or national recreational or ecological significance which require special protection to maintain existing uses.
NC DENR-Div of Water Quality (Water Quality Planning Section)
Waters which have low velocities and other natural characteristics which are different from adjacent streams.
NC DENR-Div of Water Quality (Water Quality Planning Section)
Acres per polygon (this is recalculated after the file is changed)
Software computed
Feature geometry.
ESRI
Feature geometry.
ESRI
Internal feature number.
ESRI
Area of feature in internal units squared.
ESRI
A polygon coverage depicting areas classified by the Division of Environmental Management as having either protected or critical water supply watershed areas. The polygon attribute table (PAT) has attribute data including total area in coverage units (square meters), total perimeter (linear meters), polygon internal identification number, polygon user identification number, a DWQ internal index number that relates to the identification of the stream which runs through the watershed, the classification of the watershed, the river basin the watershed is contained in, the name of the stream which runs through the watershed, the classification date of the watershed, the DWQ internal grid number that relates to the 7.5 minute USGS topographic map, the type of watershed -whether (P)roposed or (C)ritical, and the number of acres per polygon. There are no look up tables, annotation or cartosets for this data. >WSW.PAT Polygon Attribute Table >COLUMN ITEM NAME WIDTH OUTPUT TYPE DEC DESCRIPTION >1 AREA 4 12 F 3 Total area in meters >5 PERIMETER 4 12 F 3 Total perimeter in meters >9 WSW# 4 5 B - Poly internal id number >13 WSW-ID 4 5 B - Poly user id number >17 CLASS 15 15 C - DWQ stream classification > for watershed >32 RIVER-BASIN 20 20 C - Name of river basin >52 STREAM-NAME 45 45 C - Name of primary stream >97 CL-DATE 10 10 C - DWQ classification date >107 PCA-TYPE 2 2 C - Protected or critical > area classification >109 ACRES 4 12 F 3 Acres per polygon* >*(this item is recalculated after the file is altered.) >
Refer to source agency for published stream classification documents.
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NCCGIA is charged with the development and maintenance of the State's corporate geographic database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. 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. NCCGIA does not support secondary distribution of this data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data is available through standard ordering procedures on a cost recovery basis.
301 North Wilmington Street, Suite 700
Phone and electronic mail preferred