The Hazone coverage is a compilation of all known landslide hazard zones (also known as mass wasting map units) in the state of Washington. These have been compiled from previously existing watershed analyses, public, tribal, and private assessments, as well as incorporating data from the landslide hazard zonation project (LHZ), as these LHZ assessments become available. It has one related table Haz_Src_dat, related by the item Haz_src_id.
To provide a screening tool that identifies the known landslide hazards for the state of Washington, to eliminate the error of omission in the identification of unstable slopes. To support the needs of the Landslide Hazard Zonation project, as well as to provide and ongoing, supported platform to place landslide hazard area information that is regularly collected by a variety of agencies, both public and private.
This dataset is intended for us in land management, planning, regulation, research, and monitoring. For a complete picture of landslide hazard, this dataset (areas that produce landslide hazard) should be used in conjunction with the statewide landslide inventory (LSI) of known landslide locations.
publication date
A product license agreement must be agreed to before the data is made available for free download from www.dnr.wa.gov/forestpractices/data in the row marked 'landslide hazard zones'. Individual watershed analysis assessments are available in .pdf format at www.dnr.wa.gov/forestpractices/watershedanalysis. Individual landslide hazard zonation assessments are available in .pdf format at www.dnr.wa.gov/forestpractices/lhzproject/completed. Use constraints are outlined in the product license agreement.
1111 Washington St SE
PO Box 47012
Technical Data Steward: Tom Boyd Geolgist (In Training)/GIS Specialist (360) 902-1403
This data is the product of compilation of many authors work (see related table haz_src_dat for details) as well as the work of the landslide hazard zonation team. Due diligence was performed in compiling other authors work.
This is a data set in compilation. At present, no information exists to the attribute accuracy of this data.
This is a data set in compilation. At present, no information exists to the logical consistency of this data.
This is a data set in the process of compilation. At present, no information exists to the completeness of this data.
This is a data set that is in compilation. At present, no information exists to the spatial accuracy of this data. It is planned to be mapped at 1:12,000 and 1:24,000, giving rise to stated accuracies of +/- 20 and 40 feet, respectively
numerous sources have contributed data to be compiled into this data layer. There is a related file (haz_src_dat) that lists each of the source documents. Most of the sources of information are from watershed analyses, regional landform identification projects, and the landslide hazard zonation project itself.
in the process of compiling this information.
1111 Washington St SE
PO BOX 47012
Call or email. Typically, during the summer I am fighting forest fires and may not be able to respond immediately, but will respond as soon as I return.
Dataset copied.
Metadata imported.
Feature geometry.
ESRI
unique numeric identifier for each contributed dataset in entire coverage. Used to relate to table haz_src_dat that contains the source information for the contributed dataset
Landslide Hazard Zonation Project
each source identifier is related to the source table (haz_src_dat)
Landslide Hazard Zonation project
non-unique number given by the analyst for the mass wasting map unit number
landslide hazard zonation project
mass wasting map unit number-assigned by geologist analysing the watershed
landslide hazard zonation project
Mass Wasting Map Unit Name: in some instances of the collected and compiled data from outside sources, the analyst used numbers and characters (e.g. 3a, 3b) to name units. In order to compile these data, we gave the units the original name the analyst had given it, then calculated that number into to mwmu_no
analyst derived
analyst interpreted primary landform-to be used with named landforms when the landforms are complex (that is, landforms within landforms)
landslide hazard zonation protocol
Inner Gorge
Washington Administrative Code (WAC) 222-16 (definitions)
Bedrock Hollow
Washington Administrative Code (WAC) 222-16 (definitions)
Convergent Headwall
Washington Administrative Code (WAC) 222-16 (definitions)
Toe of a Deep-seated landslide
Washington Administrative Code (WAC) 222-16 (definitions)
avalanche chute
Washington Administrative Code (WAC) 222-16 (definitions)
Terrace Face
landslide hazard zonation project
Deep-seated landslide
landslide hazard zonation project
Flat (e.g. prairies, floodplains)-areas of slope less than 10%
landslide hazard zonation project
Ridgetop (to be used for stable, rounded ridgetops only)
landslide hazard zonation project
Meander Bend
analyst interpreted secondary landform-to be used with named landforms when the landforms are complex (that is, landforms within landforms)
landslide hazard zonation project protocol
Inner Gorge
Washington Administrative Code (WAC) 222-16 (definitions)
Bedrock Hollow
WAC 222-16-050
Convergent Headwall
WAC 222-16-050
meander bend
WAC 222-16-050
Toe of a Deep-seated landslide with slopes greater than 65%
WAC 222-16-050
avalanche chute
WAC 222-16-050
Terrace Face
High Terrace Faces are currently under review to be a new statewide landform.
Deep seated landslide
LHZ project Protocol
areas of slope less than 10% (e.g., floodplains, prairie flats)
LHZ project protocol
Ridgetops that do not pose a landslide hazard
LHZ protocol document
Maximum slope percent for the landform
landslide hazard zonation project analyst interpreted
Minimum slope percent for the landform
landslide hazard zonation project analyst interpreted
Interpreted shape of the slope in plan view (AKA: curvature)
landslide hazard zonation project protocol
planar
criteria set forth in the landslide hazard zonation protocol
convergent
criteria set forth in the landslide hazard zonation protocol
DIVERGENT
criteria set forth in the landslide hazard zonation protocol
HUMMOCKY
criteria set forth in the landslide hazard zonation protocol
IRREGULAR
criteria set forth in the landslide hazard zonation protocol
Analyst observed/interpreted instability, either calculated or by guidance.
landslide hazard zonation mapping protocol document
low likelihood of instability
landslide hazard zonation project mapping protocol
moderate instability potential
landslide hazard zonation project mapping protocol
high delivery potential
landslide hazard zonation project mapping protocol
very high instability potential
landslide hazard zonation project mapping protocol
indeterminant instability potential (should be rarely used)
LHZ mapping protocol
Variable (landforms of concern)
No information was provided on the stability of this polygon
During the compilation of other people's work (i.e. non-LHZ), not all analysts provided digital information on the stability of individual mass wastin map units. As time permits, these null values will be populated, based on information from the watershed analysis.
Analyst observed/interpreted ability to deliver debris to a resource or threaten public safety
landslide hazard zonation mapping protocol
This unit has a high likelihood of delivery of debris to resource or public safety
landslide hazard zonation project mapping protocol
This unit has a moderate ability to deliver sediment
LHZ protocol document
This unit has a low ability to deliver
LHZ project protocol
Unknown: analyst cannot determine FP sensitivity (should be rarely used)
LHZ project protocol
indirect
LHZ mapping protocol
no information was provided on the delivery ability of this polygon. (note: delivery is considered to be sediment and debris from landslides to any public resource [water, capital improvements of the state] or the ability to threaten public safety)
During the compilation of other people's work (i.e. non-LHZ), not all analysts provided digital information on the delivery ability of individual mass wasting map units. As time permits, these null values will be populated, based on information from the watershed analysis.
Analyst observed/interpreted sensitivity to forest practices (as defined in WAC 222-16 definitions for forest practices)
landslide hazard zonation mapping protocol
this unit is sensitive to Road building effects
analyst derived, based on the LHZ mapping protocol
this unit is sensitive to harvest effects
LHZ protocol.
this unit is sensitive to both road and harvest effects
LHZ mapping protocol. Many of the watershed analyses identified the forest practice sensitivity as high or moderate. both of these values are not valid for this database. as such, values of high or moderate were recalculated to B-sensitive to both roads and harvest.
This unit has a low sensitivity to forest practices
Previously, in watershed analysis, some areas were assigned a no or low sensitivity. All values of no sensitivity were calculated to low and the value of no sensitivity was eliminated.
Uncertain
In many watershed analyses, the analyst did not identify what the forest practice sensitivity was. In those instances, the null value was assigned to an unknown.
A flag to indicate whether the GIS lithology (at the best scale available) should be used or is it inaccurate? If not, then the correct lithology should be placed in the comments column (using statemap naming conventions).
Landslide Hazard Zonation mapping protocol
the 1:100,000 geology data accurately reflects the geology onsite
LHZ protocol
the 1:100000 geology data does not accurately reflect the geology onsite
LHZ mapping protocol and the experience of the author
it is not known if the analyst compared the field data with the Geologic data
During the compilation of other people's work (i.e. non-LHZ), not all analysts provided digital information on the lithology of individual mass wastin map units. As time permits, these null values will be populated, based on information from the watershed analysis.
comments that apply to either the polygon or to the landform in general
protocol
Landslide Area Rating (Landslide Area Rate for Delivery): a measure of the area of landslides per unit area of landform. One value is assigned to all polygons of a unique landform.
Landslide Hazard Zonation Mapping Protocol
Name of the document author
Landslide Hazard Zonation Project
Date that the document was completed
Landslide Hazard Zonation Project
Bibliographic citation (exclusive of name and date) of the source document
Landslide Hazard Zonation Project-author supplied
Internal feature number.
ESRI
Landslide Density Rating (AKA Frequency): a measure of the density of landslides per unit area of landform. One value is assigned to all polygons of a unique landform.
Landslide Hazard Zonation Mapping Protocol
describes the type of document the hazard zonation information came from
landslide hazard zonation project
Feature geometry.
ESRI
Feature geometry.
ESRI
The Hazone dataset is a polygon coverage with one related data table.
1111 Washington St SE
PO Box 47012
Distributor makes no statement about the quality of the compiled data, other than that due diligence was performed in compiling the information that was provided. Other liability statements are found in the product license agreement.
arc/info export files of the polygon attribute table, the related data table and the metadata
It is available for free download from www.dnr.wa.gov/forestpractices/data. Scroll down to the row marked 'landslide hazard areas'. click on the link marked "E00". A pop-up window witht he product license agreement will appear. If you click on 'agree' the pop-up disappears and the data begins downloading to your computer.
Due to staffing and budgetary cutbacks, there is not availability for custom orders to be filled. Information is provided in a downloadable format only.
Washington State Department of Natural Resources
Forest Practices Division
1111 Washington St. S.E.