Identification_Information: Citation: Citation_Information: Originator: United States Geological Survey Publication_Date: 2008 Publication_Time: Unknown Title: The 8, 10, and 12 hydrologic unit boundaries for Nevada Edition: 1 Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Fort Worth, Texas Publisher: U.S. Department of Agriculture, Natural Resources Conservation Service Online_Linkage: http://datagateway.nrcs.usda.gov/ Description: Abstract: This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Nevada. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 2.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 10/01/04" (http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/). Polygons are attributed with hydrologic unit codes for 4th level subbasins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, and flow modification. Polylines are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference code. Purpose: The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. The smaller sized 6th level subwatersheds are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This data set is intended to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The dataset will be appended to a larger seamless nationally consistant geospatial database as other states complete their portion of the watershed boundary dataset. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Currentness_Reference: Publication date of sources Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -121.425770 East_Bounding_Coordinate: -112.096241 North_Bounding_Coordinate: 43.129794 South_Bounding_Coordinate: 34.226563 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: HUC Theme_Keyword: Hydrologic Units Theme_Keyword: Hydrologic Unit Code Theme_Keyword: Region Theme_Keyword: Sub-region Theme_Keyword: Basin Theme_Keyword: Sub-basin Theme_Keyword: Watershed Theme_Keyword: Watershed Boundaries Theme_Keyword: boundaries Theme_Keyword: Subwatershed Theme_Keyword: WBD Theme_Keyword: Watershed Boundary Dataset Place: Place_Keyword_Thesaurus: None Place_Keyword: Nevada Place_Keyword: USA Access_Constraints: None Use_Constraints: The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Nevada. The U.S. Geological Survey, the U.S. Bureau of Land Management, the U.S. Forest Service, the U.S. Environmental Protection Agency, and the U.S. Natural Resources Conservation Service should be acknowledged as the data sources in products derived from these data. The Nevada Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. 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 or 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 result in 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 for obtaining the latest version of the data from the source distributor. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Karen Hanson Contact_Address: Address_Type: mailing address Address: 2329 Orton Circle City: West Valley City State_or_Province: UT Postal_Code: 84119 Country: USA Contact_Voice_Telephone: 801-908-5038 Contact_Electronic_Mail_Address: khanson@usgs.gov Contact_Instructions: Please email questions and requests. Data_Set_Credit: Funding and support for the Nevada Watershed Boundary Dataset (WBD) was provided by the Bureau of Land Management, the U.S. Forest Service, the U.S. Environmental Protection Agency, the Natural Resouces Conservation Service, and the U.S. Geological Survey. Representatives from the U.S. Geological Survey Utah Water Science Center and the Nevada Bureau of Land Management contributed a substantial amount of time and salary towards quality review of the dataset. Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.4.1420 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 100% of the attributes were visually verfied using ArcGIS routines and on-screen review. The attribute accuracy is dependent on the level of detail of the source material and the interpretation procedures used for capturing that source. Logical_Consistency_Report: The logical consistency topologically is clean. Polygon and chain-node topology is present. Using ArcGIS tools and routines, all polygons were checked for closure, sliver polygons, and duplicate features; all polylines were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Completeness_Report: Complete at 1:24,000-scale for Nevada. Polygon attribute fields are complete with the exception of Hu_10_GNIS and Hu_12_GNIS. Some polygons in the Ncontrb_a field might have a 0 value. Polyline attribute fields are complete. The lines adjacent to the universal polygon are temporarily attributed with a 0 for the hu_level. These lines cannot be attributed until the dataset is merged with adjacent states at which point the highest level of hydrologic unit can be determined. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The Nevada WBD was produced using Digital Raster Graphics (DRG's) as the primary source map. Data completeness for DRG files reflects content of the source graphic and may therefore be reflected in the completeness and accuracy of the WBD. It is estimated that any errors detected were less than 10%. It should also be noted that while general rules of hydrology were used (i.e. natural water flow is downhill), the locations of boundaries is still somewhat subjective as the 1:24,000-scale DRG's do not always provide enough information for identifying the location of the boundaries. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 40 feet Horizontal_Positional_Accuracy_Explanation: These data were produced using USGS 1:24,000-scale digital raster graphics as the primary base map. Maps at this scale are assumed to have an inherent error of +/- 40 feet according to the USGS National Map Accuracy Standards. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: N/A Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unknown Title: Digital Raster Graphic Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: http://datagateway.nrcs.usda.gov Larger_Work_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unknown Title: U.S. Geological Survey 7.5 Minute Topographic Quadrangle Sheets Geospatial_Data_Presentation_Form: map Online_Linkage: http://www.usgs.gov Source_Scale_Denominator: 24000 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: DRG24 Source_Contribution: Base map information for watershed delineation Source_Information: Source_Citation: Citation_Information: Originator: U.S. Department of Agriculture Publication_Date: 2006 Title: National Agricultural Imagery Program Geospatial_Data_Presentation_Form: remote-sensing image Online_Linkage: http://165.221.201.14/NAIP.html Source_Scale_Denominator: 24000 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: NAIP06 Source_Contribution: Reference map for hydrologic boundary delineation Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unknown Title: 10-meter National Elevation Dataset Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: http://ned.usgs.gov/ Source_Scale_Denominator: 12000 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: DEM10 Source_Contribution: Elevation data used to guide hydrologic unit delineation Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1994 Title: 1:250,000-scale Hydrologic Units of the United States Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 94-0236 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://water.usgs.gov/GIS/metadata/usgswrd/XML/huc250k.xml Source_Scale_Denominator: 250000 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: HUC250 Source_Contribution: Basis for 8-digit Hydrologic Unit Code (HUC) boundaries Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unknown Title: 1:24,000-scale National Hydrography Dataset Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: http://nhd.usgs.gov/ Source_Scale_Denominator: 24000 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NHD24 Source_Contribution: Surface water location and flow information Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unknown Title: Geographic Names Information System Geospatial_Data_Presentation_Form: tabular digital data Online_Linkage: http://geonames.usgs.gov/ Source_Scale_Denominator: 24000 Type_of_Source_Media: online Source_Citation_Abbreviation: GNIS Source_Contribution: Geographic names Process_Step: Process_Description: 8-dgit subbasin boundary polylines were manually delineated using 1:250,000-scale Hydrologic Unit Code (HUC) boundaries, 1:24,000-scale National Hydrography Dataset (NHD) stream lines, and 1:24,000-scale Digital Raster Graphics (DRG) for guidance. Source_Used_Citation_Abbreviation: HUC250 Source_Used_Citation_Abbreviation: NHD24 Source_Used_Citation_Abbreviation: DRG24 Process_Date: 2006-2008 Source_Produced_Citation_Abbreviation: NV WBD HUC 8 Process_Step: Process_Description: 5th and 6th level watershed and subwatershed boundaries were delineated inside NV WBD HUC 8 using either visual interpretation of DRG maps with the aid of NHD stream lines or using aggregated catchments generated using 10-meter digital elevation models (DEM) and ArcGIS watershed processing techniques followed by manual adjustment using DRG maps with the aid of NHD stream lines. National Agricultural Imagery Program imagery was used in select areas to aid delineation. Source_Used_Citation_Abbreviation: NV WBD HUC 8 Source_Used_Citation_Abbreviation: DEM10 Source_Used_Citation_Abbreviation: DRG24 Source_Used_Citation_Abbreviation: NHD24 Process_Date: 2006-2008 Source_Produced_Citation_Abbreviation: NV WBD LINES Process_Step: Process_Description: Hydrologic Unit 4, 5, and 6 lines were used to create polygons. Polygon attributes were populated as outlined in Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 using information from DRG, NHD, and GNIS. Source_Used_Citation_Abbreviation: NV WBD LINES Source_Used_Citation_Abbreviation: DRG24 Source_Used_Citation_Abbreviation: NHD24 Source_Used_Citation_Abbreviation: GNIS Source_Used_Citation_Abbreviation: NAIP06 Process_Date: 2006-2008 Source_Produced_Citation_Abbreviation: NV WBD POLYGONS Process_Step: META_ID: NV02 Process_Description: edits to attributes by USGS, Water Science Center, Salt Lake City, UT. Source_Used_Citation_Abbreviation: Process_Date: 201006 Process_Step: META_ID: NV03 Process_Description: Edits by USGS Water Science Center in Salt Lake City, Utah: Source_Used_Citation_Abbreviation: Process_Date: 2010 Process_Step: META_ID: NV04 Process_Description: Edits by USGS Water Science Center in Salt Lake City, Utah: Source_Used_Citation_Abbreviation: Process_Date: 2010 Process_Step: META_ID: NV05 Process_Description: Edits by USGS Water Science Center in Salt Lake City, Utah: The Line Mods, HU_Level, Linesource, DS codes and states were checked. Source_Used_Citation_Abbreviation: Process_Date: 20110322 Process_Step: META_ID: NV06 Process_Description: Edits by USGS Water Science Center in Salt Lake City, Utah: The Line Mods, HU_Level, Linesource, DS codes and states were checked. Source_Used_Citation_Abbreviation: Process_Date: 20110511 Process_Step: META_ID: NV07 Process_Description: Edits by USGS Water Science Center in Salt Lake City, Utah: The Line Mods, HU_Level, Linesource, DS codes and states were checked. Source_Used_Citation_Abbreviation: Process_Date: 20110519 Process_Step: META_ID: NV08 Process_Description: USGS Water Science Center in Salt Lake City, Utah: Changes to the linework and the polys; updated the linework and the corresponding polygons, as well as the linesource codes, and downstream codes where applicable. Source_Used_Citation_Abbreviation: Process_Date: 201201 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 11437 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 3707 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 16 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 3712 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000000 Longitude_Resolution: 0.000000 Geographic_Coordinate_Units: Decimal degrees 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 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Resolution: 0.000100 Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: NV_WBD_l Entity_Type_Definition: Polylines defining watershed boundaries Entity_Type_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: OBJECTID 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: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: Hu_Level Attribute_Definition: The highest hydrologic unit level (smallest number) for the polyline represented by the record Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 Enumerated_Domain_Value_Definition: Undefined. Temporary designation used for polylines on the outer boundary of the dataset where the boundary designation is unknown Enumerated_Domain_Value_Definition_Source: User defined. Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Region Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: Subregion Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: Basin Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: Subbasin Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: 5 Enumerated_Domain_Value_Definition: Watershed Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: 6 Enumerated_Domain_Value_Definition: Subwatershed Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: Linesource Attribute_Definition: The base map source(s) used to delineate at 1:24,000 scale Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: DEM10 Enumerated_Domain_Value_Definition: Derived from 10 meter Digital Elevation Model Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: DRG24 Enumerated_Domain_Value_Definition: Delineaton from 1:24,000-scale Digital Raster Graphics Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: EDNA30 Enumerated_Domain_Value_Definition: Derived from 30-meter Elevation Derivatives for National Applications Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: OTH Enumerated_Domain_Value_Definition: Other Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: ORTHO12 Enumerated_Domain_Value_Definition: Interpreted from 1:12,000-scale Ortho-imagery Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: ORTHO24 Enumerated_Domain_Value_Definition: Interpreted from 1:24,000-scale Ortho-imagery Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: Meta_id Attribute_Definition: Identifies the metadata file that applies to the polyline Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Shape_Length Attribute_Definition: Length of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Detailed_Description: Entity_Type: Entity_Type_Label: NV_WBD_p Entity_Type_Definition: Polygons defining watershed boundaries, names, and surface flow information Entity_Type_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: OBJECTID 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: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: Huc_8 Attribute_Definition: A unique 8-digit code from the U.S. Geological Survey map series "Hydrologic Unit Maps". Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Hydrologic Unit Maps Codeset_Source: U.S. Geological Survey Attribute: Attribute_Label: Huc_10 Attribute_Definition: Unique 10-digit code for each watershed. The first 8 digits of the code are derived from the Huc_8 code. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Huc_12 Attribute_Definition: Unique 12-digit code for each subwatershed. The first 10 digits of the code are derived from the Huc_10 code. Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Acres Attribute_Definition: Area of the subwatershed including non-contributing areas. Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Unrepresentable_Domain: Area in acres calculated as a whole number. Attribute: Attribute_Label: States Attribute_Definition: Two digit FIPS codes for all state(s) that the subwatershed falls within. Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Information Processing Standard Publication 5-2 Codeset_Source: U.S. National Institute of Standards and Technology Attribute: Attribute_Label: Ncontrb_a Attribute_Definition: Noncontributing area. Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Unrepresentable_Domain: Noncontributing area in acres calculated as a whole number. Attribute: Attribute_Label: Hu_10_ds Attribute_Definition: Unique 10-digit code identifing the 5th level hydrologic unit that is receiving the majority of the flow from the watershed. Outlets created by ditching or other artificial drainage were not considered for this field. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Hu_10_name Attribute_Definition: A unique name for each 5th level hydrologic unit that relates to the major water feature or significant geographic feature within the watershed. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Hu_10_Mod Attribute_Definition: Identifies modifications to natural overland flow on the watershed boundary. Modifications are identified from most significant to least significant. Attribute_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: AD Enumerated_Domain_Value_Definition: Aqueduct Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: CD Enumerated_Domain_Value_Definition: Channel Diversion Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: DD Enumerated_Domain_Value_Definition: Drainage Ditch Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: DM Enumerated_Domain_Value_Definition: Dam Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: GC Enumerated_Domain_Value_Definition: General Canal Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: ID Enumerated_Domain_Value_Definition: Irrigation Ditch Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: IT Enumerated_Domain_Value_Definition: Interbasin Transfer Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: KA Enumerated_Domain_Value_Definition: Karst Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: LE Enumerated_Domain_Value_Definition: Levee Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: MA Enumerated_Domain_Value_Definition: Mining Activity Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: NC Enumerated_Domain_Value_Definition: Non-contributing area Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: NM Enumerated_Domain_Value_Definition: No Modifications Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: OC Enumerated_Domain_Value_Definition: Overflow Channel Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: OT Enumerated_Domain_Value_Definition: Other Modification Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: PD Enumerated_Domain_Value_Definition: Pipe Diversion Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: PS Enumerated_Domain_Value_Definition: Pumping Station Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: RS Enumerated_Domain_Value_Definition: Reservoir Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: SI Enumerated_Domain_Value_Definition: Siphon Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: TF Enumerated_Domain_Value_Definition: Transportation Feature Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: UA Enumerated_Domain_Value_Definition: Urban Area Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: Hu_10_Type Attribute_Definition: This field identifies the type of watershed. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: S Enumerated_Domain_Value_Definition: Standard Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: C Enumerated_Domain_Value_Definition: Closed Basin Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: F Enumerated_Domain_Value_Definition: Frontal Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: M Enumerated_Domain_Value_Definition: Multiple Outlet Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: W Enumerated_Domain_Value_Definition: Water Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: Hu_12_ds Attribute_Definition: Unique 12-digit code identifing the 6th level hydrologic unit that is receiving the majority of the flow from the watershed. Outlets created by ditching or other artificial drainage were not considered for this field. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Hu_12_Name Attribute_Definition: A unique name for each 6th level hydrologic unit that relates to the major water feature or significant geographic feature within the subwatershed. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Hu_12_Mod Attribute_Definition: Identifies modifications to natural overland flow on the watershed boundary. Modifications are identified from most significant to least significant. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: AD Enumerated_Domain_Value_Definition: Aqueduct Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: CD Enumerated_Domain_Value_Definition: Channel Diversion Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: DD Enumerated_Domain_Value_Definition: Drainage Ditch Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: DM Enumerated_Domain_Value_Definition: Dam Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: GC Enumerated_Domain_Value_Definition: General Canal Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: ID Enumerated_Domain_Value_Definition: Irrigation Ditch Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: IT Enumerated_Domain_Value_Definition: Interbasin Transfer Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: KA Enumerated_Domain_Value_Definition: Karst Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: LE Enumerated_Domain_Value_Definition: Levee Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: MA Enumerated_Domain_Value_Definition: Mining Activity Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: NC Enumerated_Domain_Value_Definition: Non-contributing area Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: NM Enumerated_Domain_Value_Definition: No Modifications Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: OC Enumerated_Domain_Value_Definition: Overflow Channel Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: OT Enumerated_Domain_Value_Definition: Other Modification Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: PD Enumerated_Domain_Value_Definition: Pipe Diversion Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: PS Enumerated_Domain_Value_Definition: Pumping Station Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: RS Enumerated_Domain_Value_Definition: Reservoir Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: SI Enumerated_Domain_Value_Definition: Siphon Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: TF Enumerated_Domain_Value_Definition: Transportation Feature Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: UA Enumerated_Domain_Value_Definition: Urban Area Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Domain: Codeset_Name: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Codeset_Source: Natural Resources Conservation Service Attribute: Attribute_Label: Hu_12_Type Attribute_Definition: Identifies the type of subwatershed. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: S Enumerated_Domain_Value_Definition: Standard Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: C Enumerated_Domain_Value_Definition: Closed Basin Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: F Enumerated_Domain_Value_Definition: Frontal Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: M Enumerated_Domain_Value_Definition: Multiple Outlet Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Enumerated_Domain: Enumerated_Domain_Value: W Enumerated_Domain_Value_Definition: Water Enumerated_Domain_Value_Definition_Source: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Attribute: Attribute_Label: Hu_10_GNIS Attribute_Definition: Watershed Feature identification number from Geographic Names Information system. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: U.S. Geographic Names Information System Codeset_Source: U.S. Geological Survey Attribute: Attribute_Label: Hu_12_GNIS Attribute_Definition: Subwatershed Feature identification number from Geographic Names Information system. Attribute_Definition_Source: Federal Standards for Delineation of Hydrologic Unit Boundaries Attribute_Domain_Values: Codeset_Domain: Codeset_Name: U.S. Geographic Names Information System Codeset_Source: U.S. Geological Survey Attribute: Attribute_Label: Shape_Length Attribute_Definition: Perimeter of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: Shape_Area Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Overview_Description: Entity_and_Attribute_Overview: 1) Polygon attributes Huc_8 : Eight Digit Hydrologic Unit Code - (REQUIRED) A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number was used in every record that pertains to a subwatershed that resides within the same 8-digit sub-basin. Huc_10: Ten Digit Hydrologic Unit Code - (REQUIRED) Provides a unique 10-digit code for each watershed. This same number was used in every record that pertains to a subwatershed that resides within the same 10-digit watershed. Numbers were assigned in an upstream to downstream fashion where possible. Huc_12: Twelve Digit Hydrologic Unit Code - (REQUIRED) Provides a unique 12-digit code for each subwatershed. Numbers were assigned in an upstream to downstream fashion where possible. Acres: Acres - (REQUIRED) Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals. States: States - (REQUIRED) Includes the names of all state(s) that the subwatershed falls within. The 2-digit postal abbreviation in upper case and in alphabetical order was used, separated with a comma. Ncontrb_a: Non-Contributing Area - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. If a non-contributing area is on the boundary between two or more hydrologic units, the non-contributing area is associated with the hydrologic unit adjacent to the low point on the boundary. This attribute should be the total of the non-contributing areas within a hydrologic unit calculated in acres. Hu_10_ds: Fifth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Populated with the 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage were not considered for this field. If an HU flows into an ocean or the Gulf of Mexico, this field was populated with "OCEAN" and if a HU flows into one of the Great Lakes the term "LAKE" was used. If a HU flows across international borders, "CANADA" or "MEXICO" was used depending on which country the HU drains into. If an HU is a closed basin, then the term "CLOSED BASIN"was used. Hu_10_name: Fifth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Officially recognized names were used in this field. This field was populated by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". The name used to attribute the watershed was used only once within a 4th level unit. Hu_10_mod: Fifth Level Hydrologic Unit Modifications - (REQUIRED) This field identifies any type of modifications to natural overland flow that alters the location of the hydrologic unit boundary for a 10-digit watershed. This field shows the most significant to least significant modification(s) to the watershed boundary. One or more of the following abbreviations was used. SC - Stormwater Canal or Drainage Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal or Navigation Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Noncontributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel or Flume DM - Dam at outlet or HU boundary GC - General Canal/Ditch PS - Pumping Station DD - Drainage Ditch SI - Siphon AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground-Water Flow MA - Mining Activity UA - Urban Area GL - Glacier IF - Ice Field OF - Overbank Flow OT - Other Hu_10_type: Fifth Level Hydrologic Unit Type - (REQUIRED) This field was populated with the hydrologic unit type from the list provided that most closely identifies the watershed. S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing areas. This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic units are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units. C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is internal, no overland flow leaves the hydrologic unit through the outlet point. F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet. These HU's are predominantly land with some water areas at or near the outlet(s). M - “Multiple Outlet” hydrologic unit An area that has more than one natural outlet; for example, an outlet located on a stream with multiple channels. This does not include frontal or water hydrologic units, hydrologic units with artificial interbasin transfers, drainage outlets through karst or ground-water flow, or outlets that cross a stream with an island. This code should be used only in rare instances. W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, easturies, harbors. I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the shore face. U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that have been listed. Hu_12_ds: Sixth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) This field was populated with the 12-digit code of the 6th level hydrologic unit that is receiving the majority of the flow from the subwatershed. Outlets created by ditching or other artificial drainage were not considered for this field. If a HU flows into an ocean or the Gulf of Mexico it was populate with "OCEAN" and if a HU flows into one of the Great Lakes the term "LAKE" was used. If a HU flows across international borders, "CANADA" or "MEXICO" was used depending on which country the HU drains into. If an HU is a closed basin, this field was populated with the term "CLOSED BASIN". Hu_12_name: Sixth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Officially recognized names were used in this field. This field was populated by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". The name used to attribute the subwatershed was used only once within a 4th level unit. Hu_12_mod: Sixth Level Hydrologic Unit Modifications - (REQUIRED) This field identifies any type of man-made modification(s) to natural overland flow that alters the location of the hydrologic unit boundary for a 12-digit subwatershed. One or more of the following abbreviations was chosen for this field. SC - Stormwater Canal or Drainage Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal or Navigation Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Noncontributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel or Flume DM - Dam at outlet or HU boundary GC - General Canal/Ditch PS - Pumping Station DD - Drainage Ditch SI - Siphon AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground-Water Flow MA - Mining Activity UA - Urban Area GL - Glacier IF - Ice Field OF - Overbank Flow OT - Other Hu_12_type: Sixth Level Hydrologic Unit Type - (REQUIRED) This field was populated with the hydrologic unit type from the list provided that most closely identifies the subwatershed. S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing areas. This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic units are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units. C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is internal, no overland flow leaves the hydrologic unit through the outlet point. F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet. These HU's are predominantly land with some water at or near the outlet(s). M - “Multiple Outlet” hydrologic unit An area that has more than one natural outlet; for example, an outlet located on a stream with multiple channels. This does not include frontal or water hydrologic units, hydrologic units with artificial interbasin transfers, drainage outlets through karst or ground-water flow, or outlets that cross a stream with an island. This code should be used only in rare instances. W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, easturies. I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the shore face. U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that have been listed. 2) Line attributes Hu_level: Hydrologic Unit Level - (REQUIRED) This field provides the means to create cartographically pleasing maps. This field is populated with the highest hydrologic unit level (smallest number) for the line (arc) represented by the record. The attribute was recorded using numbers 1 through 6 representing each level with 1 being the highest and 6 the lowest level. An example would be if a line represents a region, subregion, basin, subbasin, watershed, and subwatershed boundary, then this cell was populated with a 1 (Region). Below is a list of numbers used for each level. Level Digit# Name 1 2 Region 2 4 Subregion 3 6 Basin 4 8 Subbasin 5 10 Watershed 6 12 Subwatershed Linesource: Line Spatial Data Source - (REQUIRED) The Linesource indicates the base map source(s) used to delineate at 1:24,000 scale. The field was populated using one of the standardized code(s) listed below. If more than one code was used, then a comma was used to separate the codes. TOPO24 - Delineation from hardcopy 1:24,000 scale topographic maps TOPO25 - Delineation from hardcopy 1:25,000 topgraphic maps, only Alaska and Caribbean TOPO63 - Delineation from hardcopy 1:63,360 topographic maps, only Alaska and Caribbean DRG24 - Delineation from 1:24,000 scale Digital Raster Graphics DRG25 - Delineation from 1:25,000 Digital Raster Graphics, only Alaska and Caribbean DRG63 - Delineation from 1:63,360 Digital Raster Graphics, only Alaska and Caribbean DEM10 - Derived from 10 meter Digital Elevation Model DEM30 - Derived from 30 meter Digital Elevation Model NED30 - Derived from 30 meter National Elevation Dateset Model EDNA30 - (formally NED-H), derived from 30 meter Elevation Derivatives for National Applications BATH"scale" (ex. BATH24) - Interpreted from NOAA 1:24,000 scale bathymetric data HYPSO"scale" (ex. HYPSO24)- Delineated from 1:24,000 scale contour data ORTHO"scale" (ex. ORTHO12) - Interpreted from 1:12,000 scale Ortho-imagery DEDEM10 - Drainage enforced 10 meter Digital Elevation Model DEDEM30 - Drainage enforced 30 meter Digital Elevation Model GPS - Derived from Global Positioning System LIDAR - Derived from LIDAR IFSAR - Derived from IFSAR data OTH - Other UNK - Unknown All other reference and source maps not listed should be noted in the metadata. Meta_id: Metadata ID Number - NV01 The Metadata ID is a code that identifies which metadata file applies to the arc. In most cases there is only one metadata file. However, in some cases more than one metadata file was used to identify different groups and/or procedures used to produce the lines. The metadata ID is a 4-character code starting with the 2-letter state FIPS code, followed by a 2-digit sequence number. For example "UT01", "ID02", etc Entity_and_Attribute_Detail_Citation: Federal Standards For Delineation of Hydrologic Unit Boundaries Version 2.0 - 10/01/04 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Natural Resources Conservation Service Contact_Address: Resource_Description: Downloadable Data Distribution_Liability: The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Nevada . The distributing agency makes no claims for the data's suitability for other purposes. The U.S. Geological Survey, the U.S. Bureau of Land Management, the U.S. Forest Service, the U.S. Environmental Protection Agency, and the U.S. Natural Resources Conservation Service should be acknowledged as the data source in products derived from these data. The Nevada Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the source agencies or 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 or 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 result in 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 for obtaining the latest version of the data from the source distributor. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://datagateway.nrcs.usda.gov/ Fees: none Metadata_Reference_Information: Metadata_Date: 20080926 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan G. Buto Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 2329 Orton Circle City: West Valley City State_or_Province: UT Postal_Code: 84119 Country: USA Contact_Voice_Telephone: 801-908-5044 Contact_Electronic_Mail_Address: sbuto@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_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