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Water: BASINS

Metadata: U.S. EPA Reach File 1 (RF1) for the Conterminous United States in BASINS

  Text Version


Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Environmental Protection Agency, Office of Science and Technology
Publication_Date: 20070611
Title:
U.S. EPA Reach File 1 (RF1) for the Conterminous United States in BASINS
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: U.S. Environmental Protection Agency
Online_Linkage:
For BASINS model and data <http://www.epa.gov/waterscience/basins/>
For further documentation and reference to EPA's River Reach Files <http://www.epa.gov/owowwtr1/monitoring/>
Description:
Abstract:
Reach File Version 1.0 (RF1) is a vector database of approximately 700,000 miles of streams and open waters in the conterminous United States. It is used extensively by EPA and States, and has been used by the U.S. Fish and Wildlife Service and the National Weather Service for many years. This configuration of RF1 for the geographic information systems community, extends the use of RF1 to ARC/INFO users in the U.S.Geological Survey, the U.S. Environmental Protection Agency and others.

RF1 was prepared by the U.S. Environmental Protection Agency (EPA) in 1982 from stable base color separates of National Oceanographic and Aeronautical Administration (NOAA) aeronautical charts having a scale of 1:500,000. These charts provided the best nationwide hydrographic coverage available on a single scale at that time. They included all hydrography shown on USGS maps having a scale of 1:250,000 with extensive additions, corrections and improvements in detail made by NOAA from aerial photography and satellite imagery. All hydrographic features on those charts were optically scanned from the color separates using a scanner resolution finer than feature line width. The surface water features selected for inclusion in the RF1 database were converted from the scanned raster form to vector form with coordinates expressed as latitude and longitude. Surface water names in RF1 were derived from the source maps and supplemented by names from miscellaneous state maps and maps of the USGS. Many other RF1 attributes are described herein.

In the 1980's, RF1 was used by EPA for performing water quality modeling on whole river basins for all of the hydrologic regions in the conterminous United States. In this role, it was used to provide national assessments and overviews of water quality and to provide the foundation for a nationwide stratified sampling frame for performing statistical summaries of modeled and measured water quality on all the surface waters of the 48 States.

In the 1980's, environmental data integration was strengthened significantly by EPA using the Reach File. Whereas, STORET had, for many years, integrated the water quality monitoring data of EPA, States, the USGS, and other Federal agencies by agency codes, standard water quality parameter codes, date, time, depth, site coordinates, state, basin, and user-definable polygons, the Reach File provided STORET with the capability to search upstream and downstream to relate the environmental data of many agencies to each other along stream paths. This brought about the ability to integrate ambient water quality at sites sampled by the several hundred official monitoring agencies using STORET in a new and powerful manner. Thus, for example, any and all water quality measurements made by the USGS and stored in WATSTORE were easily accessed via STORET prior to the introduction of the Reach File, but with the Reach File, it became possible to integrate the data from USGS WATSTORE records with the much larger holdings of environmental data from EPA, States and other Federal agencies on a station-by-station basis along stream paths. Stream ordered data integration of this type was important in the development of effluent guidelines pursuant to the Clean Water Act during the 1980's, and is but one example of the new dimension in data integration made possible by the standard reach numbering scheme and the hydrologic networking provided in RF1.

Linking multiple databases to RF1 and hence to each other, was accomplished by a process called reach indexing. The process takes advantage of the facts that each reach has been assigned a unique identifier and the stream path for each reach is described in terms of latitude/longitude coordinates. Using simple algebraic processing, each lat/lon point for every point of interest in a database is indexed to the closest point in the nearest RF1 reach. The unique reach number for that reach and its relative position, prorated against the full computed reach length, is placed in the database being reach indexed. From then on, access to all points that have been reach indexed in that indexed database, may be achieved in hydrological order by navigating upstream or downstream through RF1, picking up reach numbers in hydrological order from RF1 and retrieving the points of interest, if present, from the indexed database by reach numbers as the reaches are encountered in the navigation of RF1. For distribution with BASINS v.2.0, the spatial attributes of the database were prepared in Arcview shape file format while selected relational attributes were prepared in Arcview DBF file format.



Purpose:

This data set was prepared to support the U.S. EPA BASINS (Better Assessment Science Integrating Point and Nonpoint Sources) System.

This ARC/INFO coverage is intended for general water resources applications within the GIS user community. It was created to replace two earlier USGS translations of RF1. This coverage supercedes all previous ARC/INFO coverages.

The Rf1 coverage provides Geographic Information System (GIS) applications with a valuable data layer for base mapping of reaches within the conterminous U.S. Reach files are used in numerous types of analysis, e.g., proximity to populations. Currently, EPA's Gateway/GIS subsystem, Ecological Sensitivity Targeting and Assessment Tool (ESTAT), and various EPA public-use web-based GIS applications utilize this data set.


Supplemental_Information:
Intended use of data This data set was prepared to support the BASINS (Better Assessment Science Integrating Point and Nonpoint Sources) System, Version 2.0.

References Cited: Reach File Manual, draft of June 30, 1986, EPA, C. Robert Horn.

Procedures: The BASINS RF1 Data for the conterminous U.S. was obtained from the U.S. EPA IBM Mainframe as a separate ARC/INFO Export coverage for each hydrologic region. The export coverages were then imported and merged into one U.S. EPA region/hydrologic region ARC/INFO coverage. Each coverage was then merged with flow data to create an enhanced RF1 coverage. (just changed 1-26-98)

Reviews Applied:

Quality Assurance Data Procedures: The RF1 data were visually checked to make sure that the appropriate hydrologic regional RF1 pieces had been appended together correctly. Also the RF1 coverages were checked to make sure the flow data had been added correctly.

ARC/INFO watch files are created during the extraction of data from the EF Oracle database, the processing of the EF data into ARC/INFO point coverages, and the insertion of the point coverages into ESDLS. These files are created to monitor and verify that the processing occurred without error.

Limitations of Data:

Not all RF1 reaches reported in the conterminous U.S. are included. For example, reaches with no assigned locational coordinates cannot be included. The coordinates and the attribute data of this coverage are machine conversions by EPA of the data in the EPA RF1 files exactly as it exists in the original RF1, archived in 1982. No coordinate data were altered beyond mere conversion to an Albers Equal Area projection. The RF1 streamflow data were obtained without alteration directly from EPA STORET files as data developed for RF1 in June, 1982.

The RF1 streamflow data consist of mean annual flow and 7Q10 low flow estimates made at the downstream ends of more than 60,000 transport reaches coupled to an estimate of the time-of- travel velocity for the full length of those same reaches under each of those two flow regimes. EPA needed to estimate flows for more than 60,000 reaches because it needed flow data on all RF1 reaches and the USGS had consistent streamflow data on fewer than 2000 of them. Even on these few reaches where consistent data were available, the data were needed at the downstream ends of the reaches rather than where the USGS gages were typically located. Thus, in fact, all of the RF1 flow data are estimates at locations other than USGS gage sites. An additional limitation in the gage network was that vast areas of the country were without USGS data for drainage areas under 500 square miles, except for gages with data gaps, data skew, and anomalous conditions. Approximately 2,000 gages in this category were included in the data set used, such that 4112 gages with flow data were actually used in producing the estimates for all RF1 reaches. Another group of gages was used in the flow estimation process. Drainage area, an attribute essential to the flow estimation process used, is usually available from all USGS flow gages. All of the 4112 gages that included useful flow records, and approximately 4000 additional gages that did not have useful flow data for the project, were used to assign drainage area to reaches in RF1. The drainage area attribute available for gages was thereby used on approximately 8000 gages. By snapping gages to reaches, the project was able to acquire drainage area for approximately one reach in every eight reaches in RF1. Thus some gages were used for streamflow data and their drainage area measurement, and the remaining were used for only their drainage area measurement.

Streamflow data from the USGS Daily Values File for the 4112 gages were used to develop estimates of mean annual flow and 7Q10 flow at the gage sites. Because of data skew and anomalous conditions at many of these gages, interactive graphics techniques were applied to the solution of the mean annual and 7Q10 flow estimates at the gage sites. The interactive graphics provided visual displays of all of the daily values at the 4112 gages to visually detect skew and data anomalies within an automated framework in which the team of hydrologists in the project were able to apply graphical procedures generally used manually by hydrologists all over the world to solve for the mean annual and 7Q10 flows. It was determined in 1982 that these estimates were essentially equal to those produced for the same gages by USGS fully automated methods, except where the data were skewed or anomalous. Hydrological procedures described in "ESTIMATION OF STREAMFLOWS FOR THE REACH FILE," June, 1982 were used in an EPA contract with W.E. Gates and Associates, Inc. to transfer the mean annual flows and 7Q10 low flows at gaged sites to the downstream ends of all reaches including ungaged reaches. The average velocities over the length of each transport reach in the Reach File were developed for those two flows using streamflow, measured time-of-travel data where available, and watershed characteristics under the same contract with W.E. Gates and Associates.

EPA has advised users (1983 EPA memo to Regions, States and other RF1 users), that the overall flow estimation methodology used in producing the RF1 flow estimates was not designed to produce accurate results on start reaches or small ungaged tributaries, nor in estuaries or ungaged coastal streams. Thus the accuracy of the flow estimates in these types of streams is not expected to be adequate for many applications. The principal use of these estimates, it pointed out, was intended to be on reaches where the estimates had been made between upstream and downstream gages. Reviewers commented at that time, that the flow estimates in this latter category were essentially the same as their own which had been made by methods of their choice. EPA added that use of these flow values may benefit from an initial evaluation on a basin-wide or watershed basis, distinguishing between accuracies of the flow estimates among the various reach types, such as start reaches, and reaches in which the flow is regulated by man's activity. Factors such as irregular density of reaches in a particular area of a state or data problems within the period of record for a particular gage, may introduce local variations in the accuracy of these flow estimates. The USGS Water Resources Division cautions users that since the RF1 flow estimates are provided at the downstream ends of gaged and ungaged reaches and not at the actual gage sites, these RF1 flow estimates may differ from USGS records at the gage sites. Furthermore, the USGS Water Resources Division cautions users that these 1982 RF1 flow data are from EPA files and may not accurately represents current records of the USGS.

Summary of Differences: Total vector-object count in the AAT file: 64,955 arc features, some reaches represented by 2 records due to the 500 point limit per record in ARC/INFO Reaches without attributes: 129 CUSEG's in the RF1.AAT file have no match in the RF1.STRUCTx files, i.e., topologic attributes are missing on 129 reaches in RF1 Structure File.

Attributes without traces:

3607 RF1.STRUCTx CUSEG's have no match in the RF1.AAT file. Since ARC/INFO builds its own topology from the RF1 trace file, it will produce topologic anomalies on 3607 reaches except where the missing trace records are isolated reaches. To be of further assistance in this matter, a file which details the presence and absence of Trace File data and Structure File data on a reach-by-reach basis has been incorporated in this coverage under the Entity_Type_Label RF1.CUSEGLIST.

Related Data Sets:

RF1 was built as a database consisting of two groups of record types. The first group contained three record types which provided reach-by-reach information related by Catalog unit and reach segment number (CUSEG); the second contained two record types which provided information on areal objects namely, open waters and watersheds, which were also related by CUSEG. This ARC/INFO coverage was assembled from the three record types of the first group through a reconfiguration process beginning with the use of the following three intermediate files retrieved from EPA STORET system:

RF1struct.all RF1flow.all RF1trace.all

The rf1trace file consists of all records of the RF1 Trace Record Type; the rf1struct consists of all records of the RF1 Hydrologic Structure Record Type; and the RF1flow file consists of a subset of the RF1 Reach Characteristics Record Type. The rf1trace was used to produce the necessary AAT file and the other two files were used as sources of attribute data.


Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As Needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -127.97564
East_Bounding_Coordinate: -65.25502
North_Bounding_Coordinate: 48.27508
South_Bounding_Coordinate: 22.86745
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Reach File
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Conterminous United States
Access_Constraints: None
Use_Constraints:
None. Acknowledgement of the U.S. Environmental Protection Agency would be appreciated.

Data_Quality_Information:
Logical_Consistency_Report:
Point features present.
Completeness_Report: See Supplemental_Information
Lineage:

Process_Step:
Process_Description:
The BASINS v.1.0 data in Arc/Info coverage format and Albers Conic Equal Area projection with datum NAD27 was converted to geographic decimal degrees projection with datum NAD83 using Arc/Info. The coverages were then converted to Arcview shape files using the Arc/Info ARCSHAPE command. Selected fields in the RCHPUB database which contain estimated characteristics of stream segments were joined with the RF1 original primary attribute table to produce the primary attribute table of the RF1 version in BASINS. For distribution with BASINS 2.0, the RF1 data layer were divided by EPA regions (i.e. distribution by CD). Other form of data distribution (e.g. by cataloging unit) is available through the web at <http://www.epa.gov/waterscience/basins/>
Process_Date: 19980218
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Tetra Tech, Inc.
Contact_Address:
Address_Type: Mailing Address
Address: 10306 Eaton Place, Suite 340
City: Fairfax
State_or_Province: Virginia
Postal_Code: 22030
Country: USA
Contact_Voice_Telephone: 703-385-6000
Contact_Instructions: See Distributor_Information

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: rf1.dbf
Entity_Type_Definition: Rf1 line attribute table.
Entity_Type_Definition_Source: -
Attribute:
Attribute_Label: Fnode_
Attribute_Definition: Internal number from-node (An Arc/Info artifact).
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Tnode_
Attribute_Definition: Internal number of to-node (An Arc/Info artifact).
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Lpoly_
Attribute_Definition: Internal number of poly to left of arc (An Arc/Info artifact).
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Rpoly_
Attribute_Definition:
Internal number of poly to right of arc (An Arc/Info artifact).
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Length
Attribute_Definition:
Length of arc in coverage units (An Arc/Info artifact).
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Rf1_
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Computed Arc/Info artifact
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Rf1_id
Attribute_Definition: Arc/Info cover ID (An Arc/Info Artifact).
Attribute_Definition_Source: Computed Arc/Info
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Huc
Attribute_Definition:
Hydrologic Unit Code. This code more precisely pinpoints the water drainage area.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Seg
Attribute_Definition:
Reach segment number within Cataloging Unit, i.e., within a Catunit(CU).
Attribute_Definition_Source: Subset of Cuseg coding.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Milept
Attribute_Definition: Indicates the beginning of the reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Segno
Attribute_Definition: Indicates the reach sequence number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Rflag
Attribute_Definition: Reach flag "1" is a stream reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Owflag
Attribute_Definition: Open water flag "1" is a open water reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Tflag
Attribute_Definition: Terminal reach flag "1" is a terminal reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Sflag
Attribute_Definition: Start reach flag "1" is a start reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Type
Attribute_Definition: Indicates reach segment type.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Segl
Attribute_Definition: Indicates the length of the reach.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Lev
Attribute_Definition: Indicates the reach level order.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: J
Attribute_Definition: Indicates the reach junction number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: K
Attribute_Definition: Indicates the reach divergence number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pmile
Attribute_Definition: Indicates path mile.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: Floating value.
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Arbsum
Attribute_Definition:
Indicates the mileage distance upstream from the stream discharge.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 13
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Usdir
Attribute_Definition: Indicates upstream reach direction.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Termid
Attribute_Definition: Indicates the terminal stream system ID.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Trmblv
Attribute_Definition: Indicates terminal base level.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pname
Attribute_Definition: Indicates the primary reach name.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: character ID value
Enumerated_Domain_Value_Definition: 40 (unsure of true length)
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pnmcd
Attribute_Definition: Indicates primary name code.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Owname
Attribute_Definition: Indicates the open water name.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 40
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Ownmcd
Attribute_Definition: Indicates open water name code.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Dshuc
Attribute_Definition: Indicates the downstream cataloging unit number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Dsseg
Attribute_Definition: Indicates the downstream reach segment number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Integer value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Dsmlpt
Attribute_Definition: Indicates downstream mile point.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Mnflow
Attribute_Definition: Indicates the mean flow in the reach in cfs.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 13
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Svtnflow
Attribute_Definition:
Indicates the stream velocity in the reach at seven/ten low flow.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 12
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Mnvelo
Attribute_Definition: Indicates the stream velocity in the reach at mean flow.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Svtnvelo
Attribute_Definition:
Indicates the stream velocity in the reach at seven/ten low flow.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Rivrch
Attribute_Definition: Indicates the reach number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Cu
Attribute_Definition: Indicates the cataloging unit.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Dsseq
Attribute_Definition: Indicates downstream segment number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Usseq
Attribute_Definition: Indicates the upstream segment number.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Udir
Attribute_Definition: Indicates the upstream reach direction (L or R).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Dscsm
Attribute_Definition: Indicates the downstream Cu, segment, mile point.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Ccsm
Attribute_Definition: Complement Cu, segment, milepoint.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Cdir
Attribute_Definition: Complement bank direction.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: character ID value.
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Ulcsm
Attribute_Definition: Upstream left Cu, segment, mile point.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Urcsm
Attribute_Definition: Upstream right Cu, segment, milepoint.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: character ID value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Mdlat
Attribute_Definition: Midpoint latitude.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Mdlong
Attribute_Definition: Midpoint longitude.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Psnpdat
Attribute_Definition: Date of snapshot (yymm); zero if current.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Plowfl
Attribute_Definition: Stream-only low flow.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pmeanfl
Attribute_Definition: Stream-only mean flow.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Ptopele
Attribute_Definition: Indicates the bottom of the reach elevation.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pbotele
Attribute_Definition: Indicates the bottom of the reach elevation.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pslope
Attribute_Definition: Slope: NOT DERIVED from elevations.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pdepth
Attribute_Definition: Indicates the mean depth (feet).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pwidth
Attribute_Definition: Indicates the mean width (feet).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Ptemp
Attribute_Definition: Indicates the mean temperature.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pph
Attribute_Definition: Indicates mean pH.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Plowvel
Attribute_Definition: Total low-flow velocity.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pk1
Attribute_Definition: CBOD decay rate constant (if known).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pk2
Attribute_Definition: Rearation rate constant (if known).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pk3
Attribute_Definition: NH3 decay rate constant (if known).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pmann
Attribute_Definition: "Roughness" coefficient (if known).
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Psod
Attribute_Definition: Sediment oxygen demand.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pbgdo
Attribute_Definition: Background DO.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pbgnh3
Attribute_Definition: Background NH3.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pbgbod5
Attribute_Definition: Background COBD.
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Floating value
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Attribute:
Attribute_Label: Pbgnbod
Attribute_Definition: Background NBOD
Attribute_Definition_Source: EPA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Floating value.
Enumerated_Domain_Value_Definition_Source: USEPA/OW
Overview_Description:
Entity_and_Attribute_Overview:
The RF1.DBF polygon attribute table contains all the attributes and values needed to display graphically the reach file data layer. The items in RF1.DBF are listed, defined, and described in the section above.
Entity_and_Attribute_Detail_Citation: See Entity_and_Attribute_Information

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USEPA/Office of Water/OST
Contact_Address:
Address_Type: Mailing Address
Address: 1200 Pennsylvania Ave., NW (4305T)
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20460
Country: USA
Contact_Voice_Telephone: 202-566-0400
Contact_Facsimile_Telephone: 202-566-0409
Contact_Electronic_Mail_Address: basins@epa.gov
Distribution_Liability:
Although these data have been processed successfully on a computer system at Tetra Tech, Inc., no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The U.S. Environmental Protection Agency nor Tetra Tech, Inc. shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:
Environmental Systems Research Institute (ESRI) ArcView Shapefile
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://www.epa.gov/waterscience/basins/>
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Fees: None
Ordering_Instructions:
When requesting data by phone or mail, please inquire about spatial data sets that work with Better Assessment Science Integrating Point and Nonpoint Sources (BASINS). The BASINS web page has instructions for downloading datasets. It also has a link to The National Center for Environmental Publications and Information (NCEPI), from which BASINS CD-ROMs may be ordered. Each CD-ROM contains the BASINS v2.0 Application and this data set along with others covering the spatial extent of an EPA Region.


Metadata_Reference_Information:
Metadata_Date: 20070611
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USEPA/OW/OST
Contact_Address:
Address_Type: Mailing Address
Address: 1200 Pennsylvania Ave., NW (4305T)
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20460
Country: USA
Contact_Voice_Telephone: 202-566-0400
Contact_Facsimile_Telephone: 202-566-0409
Contact_Electronic_Mail_Address: basins@epa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608


Generated by mp on Thu Sep 10 14:15:48 1998
Text Version

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