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Metadata for 14-Digit Hydrologic Unit Areas for Ohio

14-Digit Hydrologic Unit Areas for Ohio

 

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Stafford, Jim N.
Publication_Date: 19991124
Title:14-Digit Hydrologic Unit Areas for Ohio
Edition: Version 1.02
Publication_Information:
Publication_Place: Columbus, Ohio, USA
Publisher: Natural Resources Conservation Service (NRCS)
Online_Linkage: <http://www.oh.nrcs.usda.gov> Available in DLG3 optional format or Arcview shapefile format.
Retrieval script.:To Be Determined
Description:
Abstract:
This coverage contains 14 Digit Hydrologic Unit Boundaries and Codes for the State of Ohio.
Purpose:
This data set will be used by various agencies concerned with water and other natural resource conservation in Ohio to locate data by watershed. It is subject to use by others to locate other data by watershed.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19991124
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency:As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-85.2177718219
East_Bounding_Coordinate: -80.2831896811
North_Bounding_Coordinate: 42.1547317283
South_Bounding_Coordinate:38.1673739308
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Hydrologic
Theme_Keyword: Watershed
Theme_Keyword: Subwatershed
Place:
Place_keyword_Thesaurus: None
Place_keyword: Ohio
Access_Constraints:
None
Use_Constraints:
The U.S. Department of Agriculture, Natural Resources Conservation Service, should be acknowledged as the data source in products derived from these data. These data should not be used at scales greater than 1:24,000. This data set is to be used as a primary reference source. This is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps for purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can cause misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible of obtaining the latest version of the data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Natural Resources Conservation Service
Contact_Person: Jim N.Stafford
Contact_Address:
Address_Type: mailing address
Address: 200 N. High Street, Rm. 522
City: Columbus
State_or_Province: OH
Postal_Code: 43215
Country: USA
Contact_Voice_Telephone: (614) 255-2466
Contact_Facsimile_Telephone: (614) 255-2548
Contact_Electronic_Mail_Address: jim.stafford@oh.nrcs.usda.gov
Contact_Instructions: Please use email.
Native_Data_Set_Environment:
Sun Sparc2, Sun OS 4.1.3, GRASS 4.13
Cross_Reference:
Citation_Information:
Originator: U. S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 19991124
Title:
Geospatial_Data_Presentation_Form: Map, Table, Text


Data_Quality_Information:
Attribute_Accuracy:
Attribute_ Accuracy_Report:
Polygon identifiers were manually checked with the original base map using the attribute file. Verification on polygon identification continuity on each side of a neatline is done visually on the screen as adjacent quandrangles representations are assembled into larger area data layers.
Logical_Consistency_Report:
Certain node/geometry and topology (GT) polygon/chain relationships are collected or generated to satisfy topological requirements. (The GT-polygon corresponds to a hydrologic unit or a portion of a hydrologic unit.) Some of these requirements include: chains must begin and end at nodes, left and right GT-polygons are defined for each chain element and are consistent throughout, and the chains representing the limits of the file (neatlines) are free of gaps. The tests of logical consistency are performed using vendor software. The neatline is generated by connecting the explicitly entered four corners of the digital file. All data outside the enclosed region are ignored and data crossing geographically straight lines are clipped at the neatline. Neatline straightening aligns the digitized edges of the digital data with the generated neatline (i.e., with the longitude/latitude lines in geographic coordinates). All internal polygons are tested for closure with vendor software and are checked on hard copy plots. All data are checked for common boundary lines (i.e., adjacent polygons with the same label). Quadrangles are edge matched within the Subbasin area and edge locations generally do not deviate from centerline more than 0.01 inches.
Completeness_Report:
Having been reviewed various times and by various interested parties, most omissions and errors have hopefully been removed. Selection of boundary locations were largely dependent on the original digitization where watershed boundaries were indiscriminately digitized from all divides contained on the USGS base maps. By aggregation of original polygons, appropriate watershed and subwatersheds boundaries were obtained in almost all cases. As enumerated below, additional lines were digitized in a few instances to allow for coordination across state lines, to subdivide large polygons to more closely follow acreage guidelines for 14-digit subwatersheds, and to fix errors.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
A Hydrologic unit is an area that has a common surface water drainage outlet. For the purposes of this effort, areas (not pure hydrologic units) are often grouped together depending upon their size, to form the desired size of hydrologic unit. Areas grouped at or below the 250,000 acre size, are referred to as watersheds with an eleven character code. The watersheds are then hydrologically and hydraulically divided into subareas called subwatersheds that are assigned a fourteen character code. The accuracy of these maps is generally based on the contour information or DEM data available for the base maps. Such data may be supplemented with site visits to locate ridge lines for hydrologic unit boundaries in flat terrain areas or changes in drainage patterns due to man's activities. The differences in positional accuracy between the hydrologic unit boundaries and their digitized map locations is unknown.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey in cooperation with Ohio DNR
Publication_Date: 1967
Title: Drainage Areas of Ohio Streams (Supplement to Gazetteer of Ohio Streams)
Source_Scale_Denominator: 24000
Type_of_Source_Media: USGS 7 1/2 minute quadrangles (paper)
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1967
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Gazetteer
Source_Contribution: Simple check of location and areas of Hydrologic Units.
Process_Step:
Process_Description:
Visual check of delineations
Process_Date: 1997
Source_Used_Citation_Abbreviation: USGS-ODNR
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 19600101
Title: USGS 7 1/2 minute quads
Source_Scale_Denominator: 24000
Type_of_Source_Media: USGS 7 1/2 minute quadrangles (paper)
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19600101
Ending_Date: 1996
Source_Currentness_Reference: 1996
Source_Citation_Abbreviation: Base maps
Source_Contribution: Base maps containing watershed boundaries. Copied to mylar for digitization.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NRCS
Publication_Date: 19950601
Title: Watershed and Subwatershed Mapping and Digitizing
Publication_Information:
Publication_Place: Washington, D. C.
Publisher: Natural Resources Conservation Service
Source_Scale_Denominator: 24000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NRCS National Instruction 170-304
Source_Contribution: Guidelines for digitizing and mapping watersheds and subwatersheds
Source_Information:
Source_Citation:
Citation_Information:
Originator: NRCS Ohio
Publication_Date: 1999
Title: 14-digit Hydrologic Units for Ohio
Publication_Information:
Publication_Place: Columbus, Ohio
Publisher: NRCS Ohio
Source_Scale_Denominator: 24000
Type_of_Source_Media: digital file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: HUC_14
Source_Contribution: 14-digit subwatershed boundary delineation
Process_Step:
Process_Description:
The following steps were done to develop the 14-digit subwatershed hydrologic units:

a) 1 to 24,000 scale (7 1/2 minute topographic quadrangles) maps were obtained from Ohio USGS District office. These contained drainage boundary delineations done by their office over many years for all Ohio quadrangles (about 800 quadrangles).

b) Using funds from Ohio DNR and Ohio EPA, the Ohio DNR, Real Estate and Land Management Section (REALM) carried out the digitization of the drainage boundaries. The ODNR funded the Lake Erie portion of the digitizing which was done first. The Ohio EPA funded the Ohio River drainage portion to complete the state coverage. The process of translating the boundaries from hard copy maps to digital files included copying the USGS quads onto stable mylar copies, digitizing all boundaries on quads regardless of the polygon size, and edge-matching the quads. Also, during this process, ODNR assigned a 4-digit code to each polygon along with a short narrative description of the area enclosed.

c) Through coordination of the various agencies (Ohio EPA, ODNR, NRCS and USGS) a common hydrologic boundary layer was agreed upon. This layer was the watersheds that Ohio EPA was using for their Clean Water Act, Section 319 program. These watersheds were of the appropriate size for NRCS's 11-digit watersheds (i.e. typically from 40,000 to 250,000 acres.) Therefore, the original digitized drainage boundaries were aggregated to develop the common 11-digit watershed layer. The NRCS coordinated assignment of the 3-digit extension of the USGS existing 8-digit codes to arrive at the 11-digit code. Coordination included working with the surrounding states of West Virginia, Kentucky, Indiana, Michigan and Pennsylvania, especially with the latter 3 states which further along in following the new guidelines. Short narrative descriptions were developed for each 11-digit watershed (331 watersheds.)

d) For the 14-digit subwatersheds, the NRCS guidelines called for areas typically between 10,000 and 40,000 acres, with nothing mapped smaller than 3,000 acres. The boundaries digitized off the USGS quads were again aggregated within the previously developed 11-digit layer to give consistency to area size of the 14-digit subwatersheds. Again, coordination was done across state lines to arrive at drainage boundaries that ignored state boundaries and that had a common 14-digit code. Original narrative descriptions were modified to arrive at a narrative description for the aggregated 14-digit subwatersheds (1756 subwatersheds in, or partially in, Ohio.)

e) Subwatershed delination and the coding for watersheds and subwatersheds were revisited for the 8-digit basins that straddled the Ohio River. Previous coordination with West Virginia and Kentucky had used the Ohio River as a boundary for 11 and 14-digit areas. This situation was corrected through coordination with West Virginia and allowance was made for Kentucky drainage patterns. At this time, Kentucky has decided not to develop a layer that fits in with the national guidelines but is sticking with its own 14-digit delineation.

Reviews Applied to Data. The ODNR REALM Division, which did the digitizing, checked the digital files against the source compilation of the boundaries. After aggregration of digitized polygons as described above, checking of the 11 and 14-digit watersheds occurred in the following ways:

1. Since the 11 and 14-digit watersheds were aggregated in two different procedures, they were used to check each other. That is, several errors were found when a 11-digit boundary did not coincide with a 14-digit boundary.

2. Ohio EPA's Reach File 3 stream network was used as an auxcillary layer against which to check the watershed boundaries. The stream network was not perfect but discrepancies were a flag to make further checks. Some errors were found and corrected.

3. 11 and 14-digit maps and digital files were exchanged with Indiana, Michigan and Pennsylvania to develop and check consistency of boundaries and codes across state lines.

4. Draft 14-digit maps were made for each Ohio county and sent to the NRCS field offices for review. Corrections were made from errors found by the field review.

5. Images of the county maps were placed on the Ohio NRCS web site for others use and inspection.

6. The digital layer was sent to the Ohio District USGS office and the Ohio EPA office for review.

Additions were made to the original digitization in order to coordinate across state boundaries, fix errors, and meet acreage guidelines of NRCS National Instruction 170-304. Additions made are enumerated below:

1. Slab Lousy Run (on the Frendship and West Portsmouth quadrangles in Scioto County) was corrected to show its whole drainage area draining to the Ohio River rather than divided between the Ohio and the Scioto River. It is wholly part of the 8-digit basin of 05090103 and no part of 05060002. Its 14-digit code is 05090103040070.

2. In order to match 14-digit areas of Indiana, lines were added to define boundaries for Howard Cr. and Sours Run (tribs. to Dry Fork.) Areas are in Hamilton and Butler counties on the Harrison and Shandon Quads. Digitized lines were added, partly from Indiana District of USGS and partly from Ohio NRCS. Lines form part of boundaries for subwatersheds -130, -140, -150 and -160 of the 11-digit watershed 05080003-080.

3. In order to match 14-digit areas of Indiana, a line was added to separate headwater portions of Indian Creek (tributary to Great Miami River) in Butler County. This line is on the College Corner quadrangle and forms part of the boundary between 05080002-080-020 and 05080002-080-030.

4. In order to match 14-digit areas of Indiana, a line was added to separate headwater portions of Middle Fork of East Fork Whitewater River in Darke County. This line is on the Whitewater quadrangle and forms part of the boundary between 05080003070030 and 05080003070040.

5. In order to match 14-digit areas of Indiana, lines were added to define boundaries for Big Run and Buck Run. These creeks are tributary to St. Joseph River near the northwest corner of Defiance County, on the Butler East and Edgerton quadrangles. Digitized lines were added, partly from Indiana District of USGS and partly from Ohio NRCS. Lines form part of boundaries for subwatersheds 020, 040, 050 and 070 of the 11-digit watershed 04100003060.

6. A line was added to separate Bear Creek headwaters from Little Bear Creek to match subwatersheds with Michigan. (On Assumption and Lyons quads in Fulton County.) Bear Creek headwaters is coded 04100002030050.

7. A line was added to show new boundary of Shantee Creek that has been diverted upstream of its original outlet into Halfway Creek. This area is in Lucas County and on the Toledo quadrangle. This line forms part of the boundary between the 14-digit subwatersheds of 04100001020110 and 0410001020120.

8. Drainage to Swan Creek (namely, 04100009080030) included land crossing the Maumee River at Missionary Island (Lucas County, Grand Rapids Quad.) A line was added to transfer this land to a Maumee subwatershed, namely, 04100009060030.

9. Cedar Creek of Lucas County (Reno Beach quadrangle) outlets to Lake Erie by way of Wards Canal and the Reno Side Cut. A new line was digitized to include both outlet paths in the same 14-digit area (i.e. 04100010010040).

10. Lacarpe Creek in Ottawa County has been diverted to the Portage River per field review. A line was added on the Lindsey, Elmore and Genoa quadrangles to subdivide the Lacarpe watershed. This line forms part of the boundary to subwatershed 04100010-060-010.

11. In oder to match 14-digit areas of Pennsylvania, Pennsylvania's digitizing of the boundary of Pymatuning Reservoir (in Ashtabula County, on the Andover and Leon quadrangles) was incorporated into the Ohio portion of the lake boundary. This line forms part of the boundary between 05030102010280 and 05030102010300.

12. The original polygon digitization left a few very large areas that were subdivided to obtain a more typical size for the 14-digit subwatersheds. These areas are described as follows:

12a. In the headwaters of the Mahoning River in Columbiana County a line was added to subdivide the large area. This line is on the Alliance, Damascus and Homeworth quadrangles and separates the subwatersheds 05030103010010 and 05030103010020.

12b. Leatherwood Creek, tributary of Wills Creek in Guernsey County, was subdivided by an added line on the Quaker City and Antrim quadrangles. This line separates 05040005030010 and 05040005030020.

12c. The "boot" area of Meigs County was subdivided into 4 subwatersheds. The lines added are on the New Haven, Portland and Ravenswood quadrangles and form part of the boundaries for subwatersheds 010, 030, 040, and 050 of the 11-digit watershed 05030202050. 12d. The Wabash River watershed above Beaver Creek in Darke and Mercer Counties was subdivided into 3 subwatersheds. The lines added are on the Coldwater, Cosmos, Fort Recovery, Montezuma, North Star and Rossburg quadrangles and form part of the boundaries for subwatersheds 010, 020, 030 of the 11-digit watershed 05120101010.

13. In order to match West Virginia across the Ohio River, a line was added across from Graves Cr.(West Virginia.) This line is on the Businessburg quad and separates 05030106110010 and 05030106110040.

14. In order to match West Virginia across the Ohio River, a line was added across from Fishing Cr.(West Virginia.) This line is on the Round Bottom and New Martinsville quads and separates 05030201020010 and 05030201020040.

15. In order to match West Virginia across the Ohio River, a line was added across from Middle Island Cr.(West Virginia.) This line is on the Raven Rock quad and separates 05030201020050 and 05030201020060.

16. In order to match West Virginia across the Ohio River, a line was added across from Bull Creek (West Virginia.) This line is on the Willow Island quad and separates 05030201020060 and 05030201020090.

17. In order to match West Virginia across the Ohio River, a line was added across from Little Kanawha R. (West Virginia.) This line is on the Parkersburg quad and separates 05030202010010 and 05030202010030.

18. In order to make a common boundary with Kentucky across the Ohio River, a line was added across from the Little Sandy River (Kentucky.) This line is on the Greenup quad and separates 05090103010060 and 05090103010100.

19. In order to tie in the 8-digit boundary between 05090103 and 05090201 at the Ohio/Kentucky border, a line was added to the Friendship quad.

20. In order to make a common boundary with Kentucky across the Ohio River, a line was added across from the Kinniconick Creek (Kentucky.) This line is on the Garrison and Pond Run quads and separates 05090201010010 and 05090201010070.

21. In order to make a common boundary with Kentucky across the Ohio River, a line was added across from Salt Lick Creek (Kentucky.) This line is on the Buena Vista and Vanceburg quads and separates 05090201010070 and 05090201010150.

22. In order to make a common boundary with Kentucky across the Ohio River, a line was added across from Cabin Creek (Kentucky.) This line is on the Maysville East quad and separates 05090201060010 and 05090201060110.

Process_Date: 1997-1999
Source_Used_Citation_Abbreviation: HUC11 and HUC_14


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 17
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -81.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.61
Ordinate_Resolution: 0.61
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:
Hydrologic Unit delineations are closed polygons that encompass all area draining toward the lowest point (called the outlet) in the polygon. Because of nominal sizes for the different hydrologic unit levels, Watershed (40,000 to 250,000 acres) and Subwatershed (generally 10,000 to 40,000 acres with nothing smaller that 3,000 acres), some polygons do not include all areas up to the drainage divide but all areas to one or more other upstream hydrologic units. A unique hydrologic unit code is used to identify each hydrologic unit. The watershed hydrologic unit codes start with the 8-digit subbasin (Cataloging Unit) number that contains the watershed. Likewise the subwatershed hydrologic unit codes start with the 11-digit watershed number that contains the subwatershed. Attributes associated with a hydrologic unit code may include, in the future, where appropriate: non-contributing area (acres); type of non-contributing area (number of areas, scatter throughout); trans-basin areas inflowing to hydrologic unit; trans basin area (acres); trans basin area originating hydrologic unit code; and notes concerning delineation of hydrologic unit boundary.

The following attributes are attached to the 14-digit subwatershed areas:

 
ATTRIBUTE
NAME
  DATA TYPE   DESCRIPTION
  HUC_14   Text   14 digit hydrologic unit code
  Countpolyg   Integer   Number of polygons needed to describe 14-digit area
  HUC_8   Text   8 digit hydrologic unit code
  HUC_11   Text   11 digit hydrologic unit code
  Acres   Floating point number   Number of acres in the 14-digit area in Ohio
  States   Text   Postal abbreviations for states in the 14-digit areas, listed
  alphabetically, and separated by an hyphen
  Narrative   Text   Narrative description of the 14-digit areas

Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.D.A. Natural Resources Conservation Service
Contact_Address:
Address_Type:mailing address
Mailing Address: 200 N. High Street, Room 522
City: Columbus
State_or_Province: OH
Postal_Code: 43215
Country: USA
Contact_Voice_Telephone: (614) 255-2466
Contact_Electronic_Mail_Address: jim.stafford@oh.nrcs.usda.gov
Contact_Instructions: Please use email.
Resource_Description: Identifier by which the Distributor knows the dataset: oh14dig
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Department of Agriculture, no warranty expressed or implied is made by the agency regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: DLG3 optional or Arcview shape files.
Digital_Transfer_Option:
Online_Option:
Computer_contact_information:
Network_Address:
Network_Resource_Name: http://www.ftw.nrcs.usda.gov/nsdi_node.html
Digital_Transfer_Option:
Online_Option:
Computer_contact_information:
Network_Address:
Network_Resource_Name: http://www.oh.nrcs.usda.gov
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660 Level 1
Fees:
There is an administrative charge of $50 for a CD-ROM that contains a state data set.
Ordering_Instructions: Call or write to organizations listed under "Distributor."

Metadata_Reference_Information:
Metadata_Date: 19991124
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.D.A. Natural Resources Conservation Service
Contact_Position: State Hydraulic Engineer, State GIS Specalist
Contact_Address:
Address_Type: mailing address
Address: 200 N. High Street, Room 522
City: Columbus
State_or_Province: OHIO
Country: USA
Postal_Code: 43215
Contact_Voice_Telephone: (614) 255-2466
Contact_Facsimile_Telephone: (614) 255-2548
Contact_Instructions: Please use email jim.stafford@oh.nrcs.usda.gov
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none