Landslide Hazards along River Corridors - Shallow Debris Slides Severe Hazard Potential

Metadata also available as - [Questions & Answers]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: King County
Publication_Date: 20160816
Title:
Landslide Hazards along River Corridors - Shallow Debris Slides Severe Hazard Potential
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:
Shallow debris slides are a common style of slope movement both in the Puget Lowland and Cascade Mountains. Shallow debris slides are characterized by failure of a relatively shallow layer of soil typically sliding on a surface of more competent material, either bedrock or dense glacial sediments. Shallow debris slides are typically 3 to 6 feet (1 to 2 meters) and translational. Shallow colluvial soils on slopes are formed through a variety of processes, including breaking up of the underlying in-place substrate (either bedrock or Quaternary sediments) by freeze/thaw, wetting/drying, bioturbation, and chemical weathering. Soils on steep slopes in King County vary significantly with respect to soil thickness, soil strength, and hydraulic properties; this variability presents the central challenge in assessing their stability across a landscape. Shallow debris slides are widespread across the landscape and are common occurrences during periods of high rainfall in both mountain and lowland settings. Shallow debris slides are often triggered by intense rainfall or, in developed areas, discharge of stormwater onto a steep slope. The potential for shallow debris slides is often increased by other human activities including vegetation removal (including logging) and inappropriate fill placement. Although comparatively small in scale, shallow debris slides can occur on almost any steep slopes anywhere on the landscape. Because this type of landslide is shallow in depth and small in lateral extent, the debris often does not travel a long distance — unless it transitions into a debris flow. But the debris is typically saturated, can move quickly, and often carrying logs or entire trees. Impact and inundation by such debris can be highly destructive in the area of deposition.
Purpose:
Suitable for general reference and analyses. Identifies only areas of potential shallow debris landsliding along the river corridor within the study limits in King County.
Supplemental_Information:
The stability of slopes with respect to shallow debris failures is often evaluated using a simple limit equilibrium analysis known as the infinite slope model. The infinite slope model is the only commonly used quantitative slope stability model applicable across an entire landscape. For this DNRP mapping project, an infinite slope analysis was used to generally identify slopes potentially subject to shallow debris slides. Soil strength parameters were estimated by measuring the inclination of 45 valley-wall slopes in the study limits that were relatively straight in profile. Following the DOGAMI protocol (Burns et al. 2012), slopes of 24 degrees to 28 degrees (44 to 54 percent) were identified as having a FOS between 1.25 and 1.5 and having a moderate hazard of being subject to shallow debris slides. Slopes steeper than 28 degrees (54 percent) were identified as having a FOS of less than 1.25 and having a severe hazard of being subject to shallow debris slides.
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: -122.304239
East_Bounding_Coordinate: -121.131347
North_Bounding_Coordinate: 47.781334
South_Bounding_Coordinate: 47.426542
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: 206-477-4413
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)477-4646
Contact_Electronic_Mail_Address: sevin.bilir@kingcounty.gov
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: john.bethel@kingcounty.gov
Contact_Electronic_Mail_Address: john.bethel@kingcounty.gov
Browse_Graphic:
Browse_Graphic_File_Name: <http://www5.kingcounty.gov/sdc/DataImages/lsr_sds_sevhazpot.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: Version 6.2 (Build 9200) ; Esri ArcGIS 10.3.1.5004

Data_Quality_Information:
Lineage:
Process_Step:
Process_Description: generated from a raster data
Process_Date: 20160915

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: 0

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: 0.000000026366619998441372
Ordinate_Resolution: 0.000000026366619998441372
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: Shallow Debris Slides Severe Hazard Potential
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: gridcode
Attribute_Definition_Source: King County
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: MapMethod
Attribute_Definition:
Method used to identify moderate and severe potential for shallow debris slides
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Infinite Slope and OR DOGAMI Spec. Paper 45
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: LiDARSrc
Attribute_Definition: Source LiDAR imagery and date
Attribute_Definition_Source: King County
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: KC GIS 07/2016
Enumerated_Domain_Value_Definition_Source: King County
Attribute:
Attribute_Label: TypeHaz
Attribute_Definition: Identifies severe potential for shallow debris slides
Attribute_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_Overview: Shallow Debris Slides Severe Hazard Potential
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: /plibray2/enviro/shapes/polygon/lsr_sds_sevhazpot.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: 20161104
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

Generated by mp version 2.9.12 on Sat Apr 06 04:38:01 2019