Channel Migration Areas in King County

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: King County

Publication_Date: 20050309

Title: Channel Migration Areas in King County

Edition: One

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: King County, WA

Publisher: King County

Other_Citation_Details: None

Online_Linkage: <http://www5.kingcounty.gov/gisdataportal/Default.aspx>

Description:

Abstract:

Channel migration hazards for seven King County rivers: Middle White River, Raging River, Tolt River, Three Forks area of Snoqualmie River, Cedar River, Green River, and the South Fork of the Skykomish River. The Cedar River was updated April 2015, the SF Skykomish June 2017, and the Tolt July 2018. In December 2019, the Middle White River was added, the Raging River was updated, and a revision was made to the updated Cedar CMZ.

Purpose:

This dataset can be use to estimate the channel migration for seven rivers: White River, Raging River, Tolt River, Three Forks area of Snoqualmie River, Cedar River, Green River, and the South Fork of the Skykomish River.

Supplemental_Information:

There are several rapidly migrating river systems in King County. Studies (cited below) have been prepared by or for the King County Department of Natural Resources to map and describe areas of channel migration hazard on sections of seven King County rivers: middle White River, Raging River, Tolt River, Three Forks area of Snoqualmie River, Cedar River, Green River, and the South Fork of the Skykomish River. In each study, the maximum probable future limits of channel migration were defined using historic meander belt widths and other geomorphic features. Land within these limits is classified according to the relative degree of hazard from channel migration, based upon historic rates of channel migration and the presence of major bank protection structures that protect arterial roads and subdivisions.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 20200107

Single_Date/Time:

Calendar_Date: 20060414

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.240850

East_Bounding_Coordinate: -121.301206

North_Bounding_Coordinate: 47.778799

South_Bounding_Coordinate: 47.146674

Keywords:

Theme:

Theme_Keyword_Thesaurus: Not applicable

Theme_Keyword: rivers

Theme_Keyword: hydro

Theme_Keyword: channel

Theme_Keyword: migration

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: inlandWaters

Place:

Place_Keyword_Thesaurus: Not applicable

Place_Keyword: King County

Place_Keyword: WA

Place_Keyword: Pacific NW

Place_Keyword: Washington state

Access_Constraints: None

Use_Constraints:

King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County IT, GIS Center

Contact_Person: Todd Klinka

Contact_Position: GIS Analyst

Contact_Address:

Address_Type: mailing and physical

Address: 201 S. Jackson St. Mailstop LSC-IT-225

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-477-4412

Contact_Electronic_Mail_Address: Todd.Klinka@kingcounty.gov

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS Center

Contact_Person: Fred Lott

Contact_Position: Senior GIS Specialist

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Contact_Voice_Telephone: 206-477-4758

Browse_Graphic:

Browse_Graphic_File_Name: <http://www5.kingcounty.gov/sdc/DataImages/chnlmigr.jpg>

Browse_Graphic_File_Description:

JPG File of layer overlain on base of WA counties or local cities

Browse_Graphic_File_Type: JPG

Data_Set_Credit:

See also Ken Zweig, DNRP/WLRD - Floodplain and River Management Program, 206-477-4732 for more details.

Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Unknown.

Logical_Consistency_Report:

This dataset meets standard coverage QA/QC checks such as labelerrors, nodeerrors.

Completeness_Report:

This dataset covers only the following areas of King County: middle White River, Raging River, Tolt River, South Fork Skykomish River, Three Forks area of Snoqualmie River, Cedar River, and Green River.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

CMZ boundaries typically have positional accuracy of 0-30 feet, in some areas with few control points such as eastern King County the positional accuracy could be as much as 50-100 feet. The data should not be reproduced or used at a scale larger than 1:2400.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Perkins, S.J

Publication_Date: 19930101

Title: Green River Channel Migration Study

Other_Citation_Details:

King County Department of Public Works, Surface Water Management Division, Seattle WA

Type_of_Source_Media: hardcopyPaper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 19930101

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: P1993

Source_Contribution: Used to create data.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Perkins, S.J

Publication_Date: 19960101

Title:

Channel Migration in the Three Forks Area of the Snoqualmie River

Other_Citation_Details:

King County Department of Natural Resources, Surface Water Management Division, Seattle WA

Type_of_Source_Media: hardcopyPaper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 19960101

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: P1996

Source_Contribution: Used to create data.

Process_Step:

Process_Description:

Added Cedar River CMZ data 06/15/2015 Source data 04/15/2015

Process_Date: 20150615

Process_Step:

Process_Description:

The South Fork Skykomish Channel Migration Zone (CMZ) study and map were completed in 2017. The amended channel migration public rule adopting the South Fork Skykomish CMZ became effective in September 2017.

Process_Date: 20170901

Process_Step:

Process_Description:

The Tolt River CMZ study and map, completed in June 2017, and the January 16, 2018 Reassessment of the King County Channel Migration Zone Mapping near the Holberg Levee, Tolt River (Tolt River CMZ Reassessment Technical Memo) were incorporated into the final July 2018 Tolt River Channel Migration Zone (CMZ) map per 21A-24-279A(B)(3).

The amended channel migration public rule became effective July 13, 2018

Process_Date: 20180713

Process_Step:

Process_Description:

The Raging River Channel Migration Zone (CMZ) study and map and Middle White River CMZ were completed in 2019. A smaller portion of the effective Cedar CMZ mapping was reassessed in 2019, resulting in an adjustment to the mapped hazard areas.

The amended channel migration public rule became effective December 25, 2019.

Process_Date: 20191225

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 236

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet

Lambert_Conformal_Conic:

Standard_Parallel: 47.5

Standard_Parallel: 48.73333333333333

Longitude_of_Central_Meridian: -120.8333333333333

Latitude_of_Projection_Origin: 47.0

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.00025

Ordinate_Resolution: 0.00025

Planar_Distance_Units: foot_us

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: maint.WLR.chnlmigr_area

Entity_Type_Definition: Feature attribute table.

Entity_Type_Definition_Source: ESRI

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: HAZARD

Attribute_Definition: Level of channel migration hazard.

Attribute_Definition_Source: King County

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: MODERATE

Enumerated_Domain_Value_Definition:

The moderate hazard area is located between the outer boundary of severe hazard and the maximum probable limits of future migration.

Enumerated_Domain_Value_Definition_Source: King County

Enumerated_Domain:

Enumerated_Domain_Value: POTENTIAL

Enumerated_Domain_Value_Definition:

The area is not yet a channel migration zone, but could become one.

Enumerated_Domain_Value_Definition_Source: King County

Enumerated_Domain:

Enumerated_Domain_Value: SEVERE

Enumerated_Domain_Value_Definition:

The severe hazard area includes the width of the river channel itself plus a width equal to one hundred (100) years times the average annual channel migration rate. It is assumed that channel will migrate for fifty (50) years on both sides of the present channel location during this hundred year period.

Enumerated_Domain_Value_Definition_Source: King County

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: Shape.STArea()

Attribute:

Attribute_Label: Shape.STLength()

Overview_Description:

Entity_and_Attribute_Overview:

This dataset is polygons depticting the severity of the Channel Migration hazard for the Raging River, Tolt River, Three Forks area of Snoqualmie River, Cedar River, and Green River.

Entity_and_Attribute_Detail_Citation: See Detailed Description section of Entity Attribute section.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: KCGIS Center

Contact_Person: Cheryl Wilder

Contact_Position: Data Sales Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Suite 700

City: Seattle

State_or_Province: WA

Postal_Code: 980914

Country: US

Contact_Voice_Telephone: 206-263-5220

Resource_Description: /plibrary2/hydro/shapes/polygon/chnlmigr.shp

Distribution_Liability:

King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI Shapefile

Digital_Transfer_Option:

Fees:

Contact KCGIS Client Services for the cost of reproduction - <http://www.kingcounty.gov/operations/GIS/ClientServices.aspx>

Metadata_Reference_Information:

Metadata_Date: 20210514

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS Center

Contact_Person: Fred Lott

Contact_Position: Senior GIS Specialist

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Contact_Voice_Telephone: 206-477-4758

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time