USGS Home
USGS Home USGS Home
Contact USGS
Search USGS
 Alaska Geospatial Data Committee
spacer
spacer

Coverage AK_FF_PL. Streamflow analysis regions for which peak- high- and low-flow statistics were computed, Alaska and conterminous basins in Canada.

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Janet Curran, Dan Long
Publication_Date: 20031202
Title:
Coverage AK_FF_PL Streamflow analysis regions for which peak- high- and low-flow statistics were computed, Alaska and conterminous basins in Canada
Edition: (Version 1.0, December 2, 2003)
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: None
Issue_Identification: None
Publication_Information:
Publication_Place: Anchorage, AK
Publisher:
U.S. Geological Survey Scale_Denominator: 2,000,000
Online_Linkage:
<URL:https://agdc.usgs.gov/data/usgs/water/metadata/ak_ff_pl.html>

Description:
Abstract:

Ak_ff_pl is a polygon coverage showing streamflow analysis regions in Alaska and conterminous basins in Canada. These streamflow analysis regions were developed as part of a flow-duration and flood frequency study completed in 2003 (Wiley and Curran, 2003; Curran and others, 2003) that updates and supplements a flood frequency study by Jones and Fahl (1994). The state and conterminous basins in Canada were divided into seven streamflow analysis regions having similar hydrologic characteristics for the purpose of developing regional equations for estimating selected streamflow statistics, including high-duration flow, low-duration flow, low-flow frequency, and peak-flow frequency.

Purpose:

Streamflow analysis region boundaries may be used to determine the region or regions containing a gaged or ungaged site’s drainage area in order to selected the appropriate regional equations from Wiley and Curran (2003) and Curran and others (2003). Procedures are provided in each report for estimating selected streamflow statistics for sites with drainage areas in one or more regions. Computations for sites with watersheds in more than one region are based on the drainage area, in square miles, of the watershed within each region. Areas outside the polygons are not included in the study area (primarily the western Aleutian islands and selected offshore islands for which no data exist).

Supplemental_Information:

Procedures_Used These streamflow analysis regions for Alaska and conterminous basins in Canada were created from existing hydrologic region coverages by scanning a a paper map showing previously developed flood frequency regions (Jones and Fahl, 1994) as a high quality tiff, georeferencing it to the Albers projection, and overlaying it with published digital hydrologic unit maps of Alaska (Lamke and others, 1995) and Canada (Canada Watershed Maps,1972). Hydrologic unit boundaries most closely approximating the 1994 Jones and Fahl region boundaries (and/or edits made to those boundaries by the present authors) were selected and merged to create the present region boundaries. Canadian hydrologic boundaries were adjusted slightly when needed to match Alaska boundaries. In general, the polygon boundaries follow the coastline, except along the southern portion of Alaska where on-screen digitizing was used to encompass offshore islands. The Hydrologic unit codes for the State of Alaska coverage is published at a 1:250,000 scale. The Watersheds of Canada coverages are published at a 1:2,000,000 scale.

Other_References_Cited: Wiley, Jeffrey B., and Curran, Janet H., 2003, Estimating annual high-flow statistics and monthly and seasonal low-flow statistics for ungaged streams in Alaska and conterminous basins in Canada: U.S. Geological Survey Water-Resources Investigations Report 03-4114. Lamke, Robert D., Brabets, Timothy P., and McIntire, Jacqueline A., 1995, Hydrologic unit codes for the State of Alaska: U.S. Geological Survey digital coverage, <https://agdc.usgs.gov/data/usgs/water> Jones, Stanley H., and Fahl, Charles B., 1994, Magnitude and frequency of floods in Alaska and conterminous basins of Canada: U.S. Geological Survey Water-Resources Investigations Report 93-4179, 122 p., 2 plates. Government of Canada, 1972, Canada Watersheds Maps: Government of Canada digital coverage, <http://geogratis.cgdi.gc.ca/download/watrshed>

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20031202
Currentness_Reference: N/A
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -172.94624525
East_Bounding_Coordinate: -115.61783521
North_Bounding_Coordinate: 70.47104801
South_Bounding_Coordinate: 52.0911708

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Streamflow analysis region
Theme_Keyword: watershed
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Place_Keyword: Canada
Place_Keyword: Yukon Territories
Place_Keyword: British Columbia

Access_Constraints: None

Use_Constraints: For use at scales of 1:2,000,000 or smaller.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Janet Curran
Contact_Organization: U.S. Geological Survey
Contact_Position: Hydrologist
Contact_Address:
Address_Type: Mailing address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7128
Contact_Facsimile_Telephone: 907-786-7150
Contact_Electronic_Mail_Address: (jcurran@usgs.gov)

Data_Set_Credit: N/A

Native_Data_Set_Environment:
Windows_NT, 5.0, Intel ArcInfo version 8.2

Cross_Reference:
Citation_Information:
Originator: Dan Long
Publication_Date: 20031202
Title:
Streamflow analysis regions of Alaska and conterminous basins in Canada
Geospatial_Data_Presentation_Form: (map)
Series_Information:
Series_Name: N/A
Issue_Identification: N/A
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: USGS
Online_Linkage: <URL:https://agdc.usgs.gov/>


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: N/A

Logical_Consistency_Report: Polygon topology present.

Completeness_Report: N/A

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The Hydrologic unit codes for the State of Alaska coverage is published at a 1:250,000 scale. The Watersheds of Canada coverages are published at a 1:2,000,000 scale.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS
Publication_Date: 20031202
Title:
Streamflow analysis regions of Alaska and conterminous basins in Canada
Geospatial_Data_Presentation_Form: (map)
Series_Information:
Series_Name: None
Issue_Identification: None
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: USGS
Source_Scale_Denominator: 2,000,000
Type_of_Source_Media: Paper Maps
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20031202
Source_Currentness_Reference: None
Source_Citation_Abbreviation: None
Source_Contribution: None

Process_Step:
Process_Description:
First draft of metadata created by D.A. Long using FGDCMETA.AML ver. 1.36 01/16/01 on ArcInfo data set

Process_Date: 20031202


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 226
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 1386
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 420


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55
Standard_Parallel: 65
Longitude_of_Central_Meridian: -154
Latitude_of_Projection_Origin: 50
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 50.0
Ordinate_Resolution: 50.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98


Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:


AK_FF_PL.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   4    12     F      3
    5  PERIMETER              4    12     F      3
    9  AK_FF_PL#              4     5     B      -
   13  AK_FF_PL-ID            4     5     B      -
   17  ID                     8    16     F      3


Entity_and_Attribute_Detail_Citation:
The ID field represents the region number as assigned by the authors.


Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Alaska Science Center
Contact_Address:
Address_Type: Mailing and physical address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7100
Contact_Instructions: Contact via email
Contact_Electronic_Mail_Address: jcurran@usgs.gov

Distribution_Liability:

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.


Metadata_Reference_Information:
Metadata_Date: 20031202
Metadata_Review_Date: 20031202
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Janet Curran
Contact_Position: Hydrologist
Contact_Address:
Address_Type: Mailing address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7128
Contact_Facsimile_Telephone: 907-786-7150
Contact_Electronic_Mail_Address: (jcurran@usgs.gov)
Metadata_Standard_Name:
FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2")
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none


AGDC Home | Information | Datasets | Tools | Links | Contacts

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://agdc.usgs.gov/data/usgs/water/metadata/ak_ff_pl.html
Page Contact Information: agdcweb@usgs.gov
Page Last Modified: Wednesday, 07-Dec-2016 11:58:57 AKST