Landslide Hazards along River Corridors - Lowland fans

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: King County
Publication_Date: 20160816
Title: Landslide Hazards along River Corridors - Lowland fans
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:
Depositional fans are formed when sediment moving down a steep channel is deposited where the channel gradient abruptly decreases, for example where a steep valley-wall tributary reaches the valley floor. Sediment can be carried down such a steep channel in flow-type landslides (debris flows, debris floods) or as sediment can be carried by streamflow. Fans are subject to a range of hazards depending which of the preceding processes are active.
Purpose:
Suitable for general reference and analyses. Identifies only depositional fans in Puget Lowland areas along the river corridor within the study limits in King County.
Supplemental_Information:
No simple metric was identified in the literature that could be used to screen lowland basins and identify those most likely to be inundated by such debris flows. A review of sites with known recent debris flows or debris floods in the Puget Lowland areas of King County suggests that they share some characteristics in common: (1) all of the recent incidents reviewed entailed discharge from ravines with steep side slopes, typically > 60 percent slopes; (2) all discharged onto well-defined, preexisting fans, and these flows were often initiated by a sudden release of water, and in a number of recent cases this has been the result of failure of an upstream beaver dam; (3) where the channel gradient above the fan was steep, in excess of a 15 percent slope, the discharge was in the form of a debris flow; and (4) where the channel gradient was less than a 15 percent slope, the discharge took the form of a debris flood. These observations are based on a small number of recent incidents, which is not enough to develop robust screening criteria. Based on the characteristics above, DNRP geologists used LiDAR imagery and closely spaced contour lines to map depositional fans in the Puget Lowland areas.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20160620
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.232072
East_Bounding_Coordinate: -121.654819
North_Bounding_Coordinate: 47.778487
South_Bounding_Coordinate: 47.143908
Keywords:
Theme:
Theme_Keyword_Thesaurus: Not applicable
Theme_Keyword: enviro
Theme_Keyword: Pacific NW
Theme_Keyword: King County WA
Theme_Keyword: Washington state
Theme_Keyword: landslide
Theme_Keyword: slide
Theme_Keyword: mass movement
Theme_Keyword: landslide hazard mapping
Theme_Keyword: debris slides
Theme_Keyword: shallow landslides
Theme_Keyword: shallow landsliding
Theme_Keyword: debris sliding
Place:
Place_Keyword_Thesaurus: Not applicable
Place_Keyword: Pacific NW
Place_Keyword: King County
Place_Keyword: WA
Place_Keyword: Washington state
Access_Constraints:
Access Constraint: Data is not available on GIS Data Portal, it may be available via a custom data request
Use_Constraints:
Use Constraint: 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 King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Contact_Person: Ken Rauscher
Contact_Position: GIS Analyst
Contact_Address:
Address_Type: mailing and physical
Address: 201 S Jackson St, Suite 706
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: US
Contact_Voice_Telephone: 206-477-4414
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Contact_Person: Sevin Bilir
Contact_Position: Environmental Scientist III
Contact_Address:
Address_Type: mailing and physical
Address: 201 S Jackson St Suite 600
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Contact_Voice_Telephone: +1(206)477-4645
Contact_Electronic_Mail_Address: sevin.bilir@kingcounty.go
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Contact_Person: John Bethel
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 201 S Jackson St Suite 600
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Contact_Voice_Telephone: +1(206)477-4645
Contact_Electronic_Mail_Address: john.bethel@kingcounty.gov
Browse_Graphic:
Browse_Graphic_File_Name: <http://www5.kingcounty.gov/sdc/DataImages/lsr_f_lowlandfans.jpg>
Browse_Graphic_File_Description:
JPG File of layer overlain on base of WA counties or local cities
Browse_Graphic_File_Type: JPG
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552

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: 372

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: 0.00032808333333333333
Ordinate_Resolution: 0.00032808333333333333
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: Lowland fans
Entity_Type_Definition: area data table
Entity_Type_Definition_Source: King County
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: Mapby
Attribute_Definition: Author of mapped shapes
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: KC_DNRP
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: MapDate
Attribute_Definition: Date Author completed mapping
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2016-06
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: TypeofFan
Attribute_Definition: Description of fan
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Puget Lowland fan
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: MapMethod
Attribute_Definition: Method to map depositional fans
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Topography
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: LiDARSourc
Attribute_Definition: Source LiDAR imagery and date imagery data sent to Author
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: KC GIS 2016-06
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.area
Attribute:
Attribute_Label: Shape.len
Overview_Description:
Entity_and_Attribute_Detail_Citation: King County

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 706
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: US
Contact_Voice_Telephone: 206-477-4421
Resource_Description: /plibrary2/enviro/shapes/polygon/lsr_f_lowlandfans.shp
Distribution_Liability:
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: featureclass and shapefile
Fees:
Contact KCGIS Client Services for the cost of reproduction - <http://www.kingcounty.gov/operations/GIS/GISData/GISDataDistribution.aspx>

Metadata_Reference_Information:
Metadata_Date: 20161013
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Contact_Person: Ken Rauscher
Contact_Position: GIS Analyst
Contact_Address:
Address_Type: mailing and physical
Address: 201 S Jackson St, Suite 706
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: US
Contact_Voice_Telephone: 206-477-4414
Contact_Electronic_Mail_Address: firstname.lastname@kingcounty.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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