Locations Subject to Naturally Occurring Debris Flows in the Sixes Watershed, ODF, 2000

Citation:

Citation Information:

Originator: Oregon Dept Forestry
Publication Date: 2000112
Title: Locations Subject to Naturally Occurring Debris Flows in the Sixes Watershed, ODF, 2000
Geospatial Data Presentation Form: vector digital data
Online Linkage: http://www.odf.state.or.us
Larger Work Citation:

Citation Information:

Originator: OR Dept Forestry
Publication Date: 2000112
Title: deb_flow
Online Linkage: http://www.odf.state.or.us/gis/debris.html

Description:

Abstract:
These data sets are geographically categorized by county and contain polygons designated as moderate, high, or extreme for debris flow hazard. The polygons were derived from USGS 1:24,000 Scale Digital Elevation Model (DEM) at 30 meter pixel
interval using ArcView Spatial Analyst. The process for deriving the polygons included evaluating slope steepness, geologic
units, stream channel confinement, fan shaped geomorphology, historical information on debris flow occurrence, and the ""ODF
Storm Impacts and Landslides of 1996"" study. Please refer to the ""Western Oregon Debris Flow Hazard Maps"" for methodology
and guidance in the use of this data.

Purpose:
This is coarse scale data intended to include locations subject to naturally occurring debris flows and include the initiation sites and locations along the paths of potential debris flows (confined stream channels and locations beneath steep slopes). This
data also includes those areas at risk for debris flow after landslide occurrence. This data classifies those areas where further
on-the-ground investigation is prudent prior to land management and development activities. Specific sites with a higher or
lower hazard exist in any of the hazard rating classifications. The data is intended as a screening tool and should not be used
to determine the actual hazard at any specific location.

Supplemental Information: Reprojected and clipped for use in the Oregon Coastal Atlas, 2004.

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1/12/1998
Beginning Time: Unknown
Ending Date: 12/1/1999
Ending Time: Unknown

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: Unknown

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -124.703537
East Bounding Coordinate: -124.134727
North Bounding Coordinate: 43.122093
South Bounding Coordinate: 42.415104

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: debris
Theme Keyword: flow
Theme Keyword: hazard

Place:

Place Keyword Thesaurus: None
Place Keyword: Oregon
Place Keyword: Sixes
Place Keyword: Western Oregon

Access Constraints: None
Use Constraints:
This data should not be used for insurance purposes or for final decisions on building locations without on-the-ground verification.

Data Set Credit: Oregon Department of Forestry
Native Data Set Environment: ESRI ArcCatalog 8.3.0.800

Attribute Accuracy:

Attribute Accuracy Report: N/A

Logical Consistency Report: NA
Completeness Report: Western Oregon
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report:
The horizontal positional accuracy for the baseline data (1:24,000 scale USGS DEM at 30 meter pixel interval) used to derive hazard values is plus or minus one-half of the pixel width (approx. 45 feet). Refer to
USGS 7.5 minute DEM (30x30 meter) metadata for more information.

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: USGS
Publication Date: 1999
Title: DE-DEM
Geospatial Data Presentation Form: grid
Publication Information:

Publication Place: Oregon
Publisher: Avastar

Source Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 1999
Time of Day: Unknown

Source Currentness Reference: publication date

Process Step:

Process Description:
The initial hazard attribute values were developed by deriving slope from 1:24,000 scale USGS DEM's at 30 meter pixel interval. Moderate values were assigned to those areas having a slope greater than 40 percent and a total area greater than 150,000 sq. feet (approx. 3.5 acres). Initial high values were established based on geologic formation. For the Tyee and similar geologic formations those areas in excess of 100,000 sq. feet (approx. 2 acres) having a slope greater than 65 percent were assigned a high value. For other geologic units those areas in excess of 150,000 sq. feet having a slope greater than 70 percent received a high value. High values were further delineated by watershed analysis. Within the Tyee formation those basins having slope greater than 60 percent for more than one-third of the total area received a high value for the complete basin. For other geologic formations a high value was assigned to an entire basin where slope exceeded 70% for more than one-fourth of the total area of that basin. After initial hazard attribute values were determined, each set of polygons (both moderate and high) were buffered 200 feet around their perimeters to account for the coarseness of derived slope from the 30 meter DEM and to capture confined channels with lesser slope. Confined stream channels that run off of long lengths of steep slopes (high bluffs or mountains) were assigned a hazard rating based on the dominant hazard in the upper watershed from where they originated. These streams were buffered 100 feet from their midline to create polygons 200 feet wide. The length of run-out was determined by assessing channel confinement on 1:24,000 scale USGS topographic maps. In addition, identified fan-shaped landforms were assigned the same hazard as that of the up-slope hazard from where it originated. Extreme hazard values were only assigned to watersheds and landforms next to those watersheds which were known to have experienced multiple, very rapid moving debris flows over the past 35 years. Field checks were completed at various locations to assess mapping accuracy. The coarseness of the mapping process generally allows for error in the conservative direction. However, specific on-the-ground sites with higher or lower hazard exist within any of the hazard classifications.
Process Date: 200005

Cloud Cover: 0

Direct Spatial Reference Method: Vector
Point and Vector Object Information:

SDTS Terms Description:

SDTS Point and Vector Object Type: Complete chain
Point and Vector Object Count: 56667

SDTS Terms Description:

SDTS Point and Vector Object Type: Label point
Point and Vector Object Count: 48625

SDTS Terms Description:

SDTS Point and Vector Object Type: GT-polygon composed of chains
Point and Vector Object Count: 49087

SDTS Terms Description:

SDTS Point and Vector Object Type: Point
Point and Vector Object Count: 36

Horizontal Coordinate System Definition:

Planar:

Map Projection:

Map Projection Name: Lambert Conformal Conic
Lambert Conformal Conic:

Standard Parallel: 43
Standard Parallel: 45.5
Longitude of Central Meridian: -120.5
Latitude of Projection Origin: 41.75
False Easting: 400000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 0.002179
Ordinate Resolution: 0.002179

Planar Distance Units: international feet

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257

Detailed Description:

Entity Type:

Entity Type Label: deb_flow.aat
Entity Type Definition: Arc Attribute Table
Entity Type Definition Source: software generated

Attribute:

Attribute Label: DEB_FLOW#
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: DEB_FLOW-ID
Attribute Definition: User-defined feature number.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: FID
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: FNODE#
Attribute Definition: Internal node number for the beginning of an arc (from-node).
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Whole numbers that are automatically generated.

Attribute:

Attribute Label: LENGTH
Attribute Definition: Length of feature in internal units.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute Label: LPOLY#
Attribute Definition: Internal node number for the left polygon.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Whole numbers that are automatically generated.

Attribute:

Attribute Label: RPOLY#
Attribute Definition: Internal node number for the right polygon.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Whole numbers that are automatically generated.

Attribute:

Attribute Label: Shape
Attribute Definition: Feature geometry.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Coordinates defining the features.

Attribute:

Attribute Label: TNODE#
Attribute Definition: Internal node number for the end of an arc (to-node).
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Whole numbers that are automatically generated.

Detailed Description:

Entity Type:

Entity Type Label: deb_flow.pat
Entity Type Definition: Polygon Attribute Table
Entity Type Definition Source: software generated

Attribute:

Attribute Label: ACRES
Attribute Definition: Area
Attribute Definition Source: automatically generated
Attribute Domain Values:

Unrepresentable Domain: values are in square feet

Attribute:

Attribute Label: AREA
Attribute Definition: Area of feature in internal units squared.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute Label: DEB_FLOW#
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: DEB_FLOW-ID
Attribute Definition: User-defined feature number.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: FID
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: Hazard
Attribute Definition Source: User
Attribute Domain Values:

Unrepresentable Domain: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: PERIMETER
Attribute Definition: Perimeter of feature in internal units.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute Label: POLY#
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: Shape
Attribute Definition: Feature geometry.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Coordinates defining the features.

Overview Description:

Entity and Attribute Overview:
The debris (debris flow hazard) data set consists of 22 Arcview polygon shapefiles. Each shapefile is named with a four letter abbreviation for the county in which the data resides with the exception of Lane and Douglas counties which are each divided into east and west by the I-5 corridor. Each shapefile is attributed for hazard, area, perimeter, and acres. The number of records is dependent on the range of hazard classification within the county. For most counties there will only be moderate and high classifications for the hazard attribute. For those counties having an extreme hazard the shapefile will consist of three records.
Entity and Attribute Detail Citation:
Arc attributes: None Polygon attributes: Hazard, Area, Acres, and Perimeter. The units for area are square feet and the units for perimeter are linear feet.

Distributor:

Contact Information:

Contact Person Primary:

Contact Person: Emmor Nile
Contact Organization: OR Dept Forestry

Contact Address:

Address Type: mailing address
Address: 2600 State St.
City: Salem
State or Province: OR
Postal Code: 97310
Country: USA

Contact Voice Telephone: (503) 945-7418
Contact Facsimile Telephone: (503) 945-7212
Contact Electronic Mail Address: emmor.nile@state.or.us
Hours of Service: 8 am - 5 pm

Resource Description: Downloadable Data
Distribution Liability:
Ecotrust makes no express or implied warrantees with respect to the character, fitness, or accuracy of the information presented,
or their appropriateness for any users purposes. See ODF for additional information.

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ESRI
Format Version Number: N/A
File Decompression Technique: WinZip

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: deb_flow

Access Instructions: simple download

Fees: None
Ordering Instructions: contact ODF

Available Time Period:

Time Period Information:

Single Date/Time:

Calendar Date: Unknown
Time of Day: Unknown

Metadata Date: 2/27/2004
Metadata Review Date:
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Ecotrust

Contact Address:

Address Type: mailing address
Address: 721 NW 9th Suite 200
City: Portland
State or Province: Oregon
Postal Code: 97209
Country: USA

Contact Voice Telephone: 503-227-6225
Contact Instructions: Ecotrust created FGDC metadata from the originator's metadata so we can serve the GIS information. Please refer back to the originator for updates and additional information or clarification.

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time
Metadata Access Constraints: none
Metadata Use Constraints: none
Metadata Extensions:

Online Linkage: http://www.esri.com/metadata/esriprof80.html
Profile Name: ESRI Metadata Profile