SEA_WAT_CHAMP

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:

Nicholas T Legg, Shorelands and Environmental Assistance Program, Washington State Department of Ecology, Project Hydrogeologist

Publication_Date: 20150227

Title: SEA_WAT_CHAMP

Edition: 1st

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Ecology Publication

Issue_Identification: 15-06-003

Other_Citation_Details:

The background, use, and development of the CHAMP layer are fully described in Ecology Publication 15-06-003 (full report citation and URL below). That report also describes visual assessment techniques that should be used along with the CHAMP layer to assess channel migration potential. Legg, N.T. and Olson, P.L., 2015, Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Layers and Visual Assessments: Washington State Department of Ecology Publication 15-06-003, 40 p. https://fortress.wa.gov/ecy/publications/SummaryPages/1506003.html

Description:

Abstract:

The Channel Migration Potential (CHAMP) layer contains stream networks of Western Washington (and much of Western Oregon) with associated data and information important for assessing channel migration activity. It also features information on channel characteristics such as stream flow and physical dimensions. This data layer’s main feature is a classification of channel migration potential based on channel confinement and erosion potential. The layer was derived from existing statewide geospatial datasets and classified according to channel migration measurements by the High Resolution Change Detection (HRCD) project for the Puget Sound Region (Washington Department of Fish and Wildlife, 2014). While the layer identifies the potential for channel migration, it does not predictchannel migration rates. Thus, this data layer should be used to screen and prioritize stream reaches for further channel migration evaluation. The tool helps plan and prioritize floodplain management actions such as Channel Migration Zone mapping, erosion risk reduction, and floodplain restoration.The background, use, and development of the CHAMP layer are fully described in Ecology Publication 15-06-003 (full report citation and URL below). That report also describes visual assessment techniques that should be used along with the CHAMP layer to assess channel migration potential. Legg, N.T. and Olson, P.L., 2015, Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Layers and Visual Assessments: Washington State Department of Ecology Publication 15-06-003, 40 p. https://fortress.wa.gov/ecy/publications/SummaryPages/1506003.html

Purpose:

Lateral movement, or migration, of stream channels can threaten infrastructure and communities, while at the same time sustain floodplain health. Both the costs to human communities and the ecological benefits of migrating streams call for the identification and incorporation of migrating streams into resource management decisions. The Washington State Department of Ecology (Ecology) has developed the The Channel Migration Potential (CHAMP) GIS layer to assess channel migration potential.

Supplemental_Information:

The background, use, and development of the CHAMP layer are fully described in Ecology Publication 15-06-003 (full report citation and URL below). That report also describes visual assessment techniques that should be used along with the CHAMP layer to assess channel migration potential. Legg, N.T. and Olson, P.L., 2015, Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Layers and Visual Assessments: Washington State Department of Ecology Publication 15-06-003, 40 p. https://fortress.wa.gov/ecy/publications/SummaryPages/1506003.html

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20150301

Currentness_Reference:

The CHAMP layer covers Hydrologic Unit "Sub-regions" (identified by 4-digit codes):1708, 1709, 1710, and 1711. These watershed areas extend across all of Western Washingtion and most of Western Oregon as defined by the crest of the Cascade Range. The CHAMP data layer extends upstream to points in the drainage network with predicted mean annual flows of 10 cubic feet per second (cfs). The CHAMP layer was developed in the Shorelands and Environmental Assistance Program of the Washington Department of Ecology. The program’s jurisdiction in fluvial systems extends to points in the drainage network with mean annual flows of 20 cfs. Mean annual flow was therefore a logical basis for and useful attribute within the CHAMP layer. Mean annual flow is reported in the field [maf_cfs_v].

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -125.016459

East_Bounding_Coordinate: -120.671803

North_Bounding_Coordinate: 49.019146

South_Bounding_Coordinate: 42.517446

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: inlandWaters

Theme_Keyword: geoscientificInformation

Theme_Keyword: environment

Theme_Keyword: society

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Western Washington

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Western Oregon

Access_Constraints: None

Use_Constraints:

Generally, this data layer should be used to screen and prioritize stream reaches for further channel migration evaluation. The data resolution does not allow one to predict channel migration. The classification identifies stream segments for further examination, and those that likely require limited attention or analysis. The potential uncertainty involved in the classification approach is a reason for the visual assessment techniques (described below in Ecology Publication 15-06-003) being described along with the CHAMP data layer.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Patricia L. Olson

Contact_Position: Senior Hydrogeologist

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-7540

Contact_Electronic_Mail_Address: pols461@ecy.wa.gov

Hours_of_Service: 8:00-17:00, Monday-Friday

Contact_Instructions: Technical point of contact through late spring 2015

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Shorelands and Environmental Assistance Program, Washington State Department of Ecology

Contact_Person: Patricia L. Olson

Contact_Position: Senior Hydrogeologist

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-7540

Contact_Electronic_Mail_Address: patricia.olson@ecy.wa.gov

Hours_of_Service: 8:00-17:00, Monday-Friday

Contact_Instructions: Technical point of contact through late spring 2015

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Program Hydrogeologist

Contact_Position:

Program Hydrogeologist, Shorelands and Environmental Assistance Program

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-6966

Contact_TDD/TTY_Telephone: (877) 833-6341

Hours_of_Service: 8:00-17:00, Monday-Friday

Contact_Instructions:

Technical point of contact from Summer 2015 forward To request ADA accommodation or materials in a format for the visually impaired, call Ecology at, 360-407-6000. Persons with impaired hearing may call Washington Relay Service at 711. Persons with speech disability may call TTY at 877-833-6341.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Program Hydrogeologist

Contact_Position:

Program Hydrogeologist, Shorelands and Environmental Assistance Program

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-6966

Contact_TDD/TTY_Telephone: (877) 833-6341

Hours_of_Service: 8:00-17:00, Monday-Friday

Contact_Instructions:

Technical point of contact from Summer 2015 forward To request ADA accommodation or materials in a format for the visually impaired, call Ecology at, 360-407-6000. Persons with impaired hearing may call Washington Relay Service at 711. Persons with speech disability may call TTY at 877-833-6341.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Rich Kim

Contact_Position: Spatial Database Administrator

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-6121

Contact_Electronic_Mail_Address: rich.kim@ecy.wa.gov

Hours_of_Service: 8:00-17:00, Monday-Friday

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Shorelands and Environmental Assistance Program, Washington State Department of Ecology

Contact_Person: Nicholas T Legg

Contact_Position: Project Hydrogeologist

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-7296

Contact_Electronic_Mail_Address: nicholas.legg@ecy.wa.gov

Contact_Instructions: Unavailable for contact after 2/20/2015

Browse_Graphic:

Browse_Graphic_File_Name:

https://fortress.wa.gov/ecy/gispublic/DataDownload/SEA_WAT_CHAMP.jpg

Browse_Graphic_File_Description: Simple image

Browse_Graphic_File_Type: JPG

Data_Set_Credit:

The tool developers would like to thank the following people for their contribution to this work: • Brian D. Collins (University of Washington) • Jerry Franklin (Washington Department of Ecology) • Christina Kellum (Washington Department of Ecology) • Matt Muller (Washington Department of Fish and Wildlife) • Hugh Shipman (Washington Department of Ecology) • Terry Swanson (Washington Department of Ecology) This project has been funded wholly or in part by the United States Environmental Protection Agency under Puget Sound Ecosystem Restoration and Protection Cooperative Agreement Grant PC-00J27601 with Washington Department of Ecology. The contents of this document do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.

Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270

Data_Quality_Information:

Logical_Consistency_Report:

Data was generated using the same approach for the entire layer.

Completeness_Report:

The dataset is complete. However, stream segments with watersheds extending north of the US-Canadian border will underestimate precipitation, discharge, and channel dimension attributes because Canadian precipitation data were not available for this project. This limitation affects a relatively small proportion of the data layer, but is nonetheless an important consideration near the northern data boundary. Error magnitude will increase with the proportion of a watershed within Canada.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 84657

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Washington South FIPS 4602 Feet

Lambert_Conformal_Conic:

Standard_Parallel: 45.83333333333334

Standard_Parallel: 47.33333333333334

Longitude_of_Central_Meridian: -120.5

Latitude_of_Projection_Origin: 45.33333333333334

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.0006510416666666666

Ordinate_Resolution: 0.0006510416666666666

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: SEA_WAT_CHAMP

Entity_Type_Definition:

Line features representing stream networks generated from 30-m Digital Elevation Models (DEMs) using ESRI's Hydrology tools.

Entity_Type_Definition_Source: Ecology

Attribute:

Attribute_Label: slope_tan

Attribute_Definition:

The channel slope in terms of the ratio of channel vertical elevation loss to horizontal length (i.e. the tangent of the channel slope angle).

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Channel slope was calculated as the difference between the endpoint elevations ([elev_up_ft] - [elev_dn_ft]) divided by the channel segment length [seg_lth_ft].

Attribute:

Attribute_Label: elev_dn_ft

Attribute_Definition: Elevation in feet above sea level of the downstream segment end

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Elevation extracted from USGS 30-meter DEMs. Reported in feet above sea level.

Attribute:

Attribute_Label: bavg_slp

Attribute_Definition:

Basin-average slope: the average land surface slope (in degrees) in the CHAMP segment's watershed. Measurements of basin-average slope were made using ESRI's Flow Accumulation tool weighted by a slope raster generated from USGS 30-m DEMs.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 90

Attribute_Domain_Values:

Unrepresentable_Domain: Values of slope in degrees.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: cwid_ftmaf

Attribute_Definition:

Channel width (width of flow in feet) predicted for mean annual flow conditions

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

The Magirl and Olson (2009) dataset used to validate the Vogel et al. (1999) regression equations also had measurements of channel width that allowed Ecology to develop a regression equation to predict channel width. The regression equation relating predicted mean annual flow (MAFP, cfs, [maf_cfs_v]) to channel width (WMAF, ft, [cwid_ftmaf]) is: WMAF=4.09*MAF_P^0.478 (R^2=0.87,p=3.5*10^-114) According to Newman’s (1993) methods for correcting regression bias in log-transformed data, a bias correction factor of 1.04 was applied to the above equation (resulting in a coefficient of 4.25).

Attribute:

Attribute_Label: b_hrcd_res

Attribute_Definition:

Below the resolution of High Resolution Change Detection (HRCD) mapping in the Puget Sound region (Washington Department of Fish and Wildlife, 2014). Streams below predicted bankfull widths of 21 feet had no measured stream erosion, and therefore were identified as being too narrow for the HRCD process to detect land cover change.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Null

Enumerated_Domain_Value_Definition:

The CHAMP segment falls outside of the area mapped by the HRCD project (which occurred only within the Puget Sound region.

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: 0

Enumerated_Domain_Value_Definition:

The CHAMP segment has a predicted bankfull channel width [cwid_ft_bf] of more than 21 feet, and is therefore considered within the resolution of HRCD mapping.

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition:

The CHAMP segment has a predicted bankfull channel width [cwid_ft_bf] of less than 21 feet, and is therefore considered below the resolution of HRCD mapping.

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Indicates whether a stream segment is within resolution of the High Resolution Change Detection mapping (WDFW, 2014)

Attribute:

Attribute_Label: eros_class

Attribute_Definition:

The erosion potential classification for a CHAMP segment. Ecology classified segments according to stream power index [s_x_dis].

Attribute_Definition_Source: Ecology.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Unknown Erosion Potential

Enumerated_Domain_Value_Definition:

The segment's stream power is Null due to the channel slope being measured as zero. These segments will commonly fall on flat waterbodies such as lakes and reservoirs where the DEM is flat.

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Low Erosion Potential

Enumerated_Domain_Value_Definition:

The segment’s stream power falls in the low range where less than 5 percent of the HRCD measured eroded area occurred from 2006-2009.

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Moderate Erosion Potential

Enumerated_Domain_Value_Definition:

The segment’s stream power falls outside of the high erosion potential class, but is above the stream power where >95% of HRCD-measured erosion occurred in 2006-2009.

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: High Erosion Potential

Enumerated_Domain_Value_Definition:

The segment’s stream power index falls in the high range where approximately 80% of the HRCD-measured erosion occurred from 2006-2009 in the Puget Sound region

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

The full classification process and logic is contained in Ecology publication 15-06-003.

Attribute:

Attribute_Label: sl_x_dis

Attribute_Definition:

Stream power index or the product of channel slope [slope_tan] times discharge [maf_cfs_v]. Stream power index relates to the erosive power of a stream, and is used for the erosion potential classification [eros_class].

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain: Values of stream power index in units of cfs.

Attribute:

Attribute_Label: conf_class

Attribute_Definition: Classification of the CHAMP segment's confinement [vwidth_bfw].

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Unconfined

Enumerated_Domain_Value_Definition: Valley width exceeds 4x channel width

Enumerated_Domain_Value_Definition_Source: Montgomery and Buffington (1998)

Enumerated_Domain:

Enumerated_Domain_Value: Confined

Enumerated_Domain_Value_Definition: Valley width is less than 2x channel width

Enumerated_Domain_Value_Definition_Source: Montgomery and Buffington (1998)

Enumerated_Domain:

Enumerated_Domain_Value: Moderately Confined

Enumerated_Domain_Value_Definition: Valley width is between 2x and 4x channel width

Enumerated_Domain_Value_Definition_Source: Montgomery and Buffington (1998)

Attribute_Domain_Values:

Unrepresentable_Domain:

See the description of attribute [vwidth_bfw] for an explanation of confinement calculations.

Attribute:

Attribute_Label: WShedArea

Attribute_Definition: Watershed area of a given segement in square miles

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Watershed area was calculated in raster form using ESRI's Flow Accumulation Tool (Spatial Analyst) and converted to square miles. Watershed area was extracted for each segment at the segment's midpoint.

Attribute:

Attribute_Label: up_node

Attribute_Definition: Identification number of the node at upstream segment end

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers identifying the node located at the upstream end of the segment. This value is the same as the [down_node] for the segment directly upstream.

Attribute:

Attribute_Label: er_pl_0609

Attribute_Definition:

Erosed area per unit length (square feet per foot) of stream measured from 2006-2009 by the High Resolution Change Deteciton Project (WDFW, 2014). Eroded area mapped by the HRCD project identified within the vicinity of each CHAMP segment was then divided by segment length [seg_lth_ft]. This is the metric of erosion intensity used to develop the "Erosion Potential" classification [eros_class]. WDFW mapped 2006-2009 land cover change for the entire Puget Sound region.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Null

Enumerated_Domain_Value_Definition:

Stream segment is outside of the Puget Sound, where WDFW measured land cover change from 2006-2009.

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Values of eroded area per unit stream length (square feet per foot). Values can be greater than or equal to 0.

Attribute:

Attribute_Label: pct_alp

Attribute_Definition:

The percentage of the CHAMP segment's watershed within alpine areas. Alpine area was classified according to the US National Land Cover Dataset (2006) according to methods of Beechie and Imaki (2014). Alpine areas are those identified as barren, ice, and unvegetated above elevations of 2000 meters above sea level. Measurements of alpine area in watersheds were made using ESRI's Flow Accumulation tool weighted by an alpine area raster.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 100

Attribute_Units_of_Measure: Percent

Attribute:

Attribute_Label: mig_class

Attribute_Definition:

The full channel migration classification scheme which combines the Confinement classification [conf_class] and the Erosion Potential classification [eros_class]. Nine combinations are possible. See the respective fields for full descriptions of each sub-classification.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Confined with Low Erosion Potential

Enumerated_Domain_Value_Definition: Confined with Low Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Confined with High Erosion Potential

Enumerated_Domain_Value_Definition: Confined with High Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Confined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition: Confined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Moderately Confined with High Erosion Potential

Enumerated_Domain_Value_Definition: Moderately Confined with High Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Confined with Unknown Erosion Potential (Null [s_x_dis])

Enumerated_Domain_Value_Definition: Confined with Unknown Erosion Potential (Null [s_x_dis])

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Unconfined with Unknown Erosion Potential (Null [s_x_dis])

Enumerated_Domain_Value_Definition: Unconfined with Unknown Erosion Potential (Null [s_x_dis])

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Moderately Confined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition: Moderately Confined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Unconfined with Low Erosion Potential

Enumerated_Domain_Value_Definition: Unconfined with Low Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Moderately Confined with Low Erosion Potential

Enumerated_Domain_Value_Definition: Moderately Confined with Low Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Unconfined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition: Unconfined with Moderate Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Enumerated_Domain:

Enumerated_Domain_Value: Unconfined with High Erosion Potential

Enumerated_Domain_Value_Definition: Unconfined with High Erosion Potential

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

See the respective fields for full descriptions of each sub-classification.

Attribute:

Attribute_Label: dn_hydroid

Attribute_Definition: Identification number of the segment directly downstream

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers identifying the segment directly downstream. These numbers correspond the the [hydroid] of the segment directly downsream.

Attribute:

Attribute_Label: maf_cfs_v

Attribute_Definition:

Predicited mean annual flow in cubic feet per second (cfs) using regression equations of Vogel et al. (1999).

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Regression equations developed by Vogel et al. (1999) provided a simple means to predict mean annual flow, with one equation applying to the entire Pacific Northwest. Their equation predicts mean annual flow based on watershed area, mean annual precipitation, and mean annual temperature. Precipitation and temperature values are averaged across watersheds. These climatological watershed-averages were determined by generating flow accumulation rasters weighted by climatological rasters (using ESRIs Flow Accumulation tool under Spatial Analyst). According to the methods of Vogel et al. (1999), Ecology used rasters of mean annual precipitation and temperature from 1961-1990 available from the PRISM climate group (Daly et al., 2000). Ecology first tested the regression equation predictions with a set of mean annual flow measurements compiled by Magirl and Olsen (2009). Regressing measured (MAFM) to predicted mean annual flow (MAFP) revealed a strong correlation with little bias (MAFM = 0.99* MAFP; R2= 0.97). Values of mean annual flow were generated in raster form, and then extracted to CHAMP segments at segment midpoints.

Attribute:

Attribute_Label: Shape_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: HUC12

Attribute_Definition:

The 12-digit Hydrologic Unit Code identifying the Hydrologic Unit containing the CHAMP segment. HUC codes are adapted from Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987, Hydrologic Unit Maps: U.S. Geological Survey Water-Supply Paper 2294, 63 p.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain:

A CHAMP segment was considerid within a Hydrologic Unit if the segment's midpoint fell within the boundary of the unit polygon.

Attribute:

Attribute_Label: vwidth_bfw

Attribute_Definition:

Confinement, or valley width in the number of channel widths fitting within the valley.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Valley width [vwidth_ft] divided by predicted bankfull channel width [cwid_ft_bf].

Attribute:

Attribute_Label: trib_da_rat

Attribute_Definition:

Tributary drainage area ratio: the ratio between a tributary's drainage area and a trunk stream's drainage area. This ratio is a useful metric for assessing habitat potential (Benda et al., 2004). Higher ratios indicate the tributary is more likely to influence the form and physical complexity at tributary junctions. Non-null values only fall at CHAMP segments directly downstream of stream confluences.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Null

Enumerated_Domain_Value_Definition:

The stream segment is not directly below a stream confluence, therefore drainage area ratio cannot be calculated.

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 1

Attribute_Units_of_Measure: Unitless

Attribute:

Attribute_Label: er_pl_0911

Attribute_Definition:

Eroded area per unit length (square feet per foot) of stream measured from 2009-2011 by the High Resolution Change Deteciton Project (WDFW, 2014). Eroded area mapped by the HRCD project identified within the vicinity of each CHAMP segment was then divided by segment length [seg_lth_ft]. This is the metric of erosion intensity used to test the "Erosion Potential" classification [eros_class]. At the time of this layer's development, WDFW had mapped 2009-2011 for a subset of the Puget Sound Region (including Water Resource Inventory Areas (WRIAs) 1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 15, and 16.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Null

Enumerated_Domain_Value_Definition:

Stream segment is outside of the WRIAs 1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 15, and 16, where WDFW measured land cover change from 2009-2011.

Enumerated_Domain_Value_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Values of eroded area per unit stream length (square feet per foot). Values can be greater than or equal to 0.

Attribute:

Attribute_Label: HYDROID

Attribute_Definition: Segment Identification Number

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers automatically generated during processing

Attribute:

Attribute_Label: down_node

Attribute_Definition: Identification number of the node at downstream segment end

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole number identifying the node located at the downstream end of the segment. This value is the same as the [up_node] for the segment directly downstream.

Attribute:

Attribute_Label: cwid_ft_bf

Attribute_Definition: Predicted bankfull channel width in feet

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Bankfull channel width is the most commonly used dimension of channel size. The bankfull channel is that which commonly carries an approximate 1.5- to 2-year recurrence interval flood in the Pacific Northwest, or more generally the most geomorphically effective flow (Castro & Jackson, 2001). Prior to this study, only regression equations developed using small datasets were available to predict bankfull width in Western Washington. Ecology developed a regression equation using 179 channel measurements distributed across Western Washington available through Ecology’s Environmental Information Management System (measurements made by Ecology’s Biological Monitoring and Status and Trends Monitoring Programs). The regression equation relates watershed area (A, mi2, [wshedarea]) and mean annual precipitation (watershed average, P, inches per year, [baprec7100]) to bankfull channel width (WBF,ft): WBF = 0.91*A^0.381*P^0.634 (R^2=0.83; p=2.66*10^-68) A bias correction factor of 1.16 (as calculated using Newman’s (1993) procedure) is applied to the above equation. The above equation appears to have the greatest relevance at bankfull widths below about 250 feet. At widths greater than 250 feet, the equation consistently over-predicted the few measurements available. It's also unclear how well the equation above predicts bankfull channel width in Oregon, because only measurements from Washington were used in the equation's development.

Attribute:

Attribute_Label: baprec7100

Attribute_Definition:

Basin-average precipitiation: the average annual precipitation (in inches) for a watershed from 1971-2000 according to PRISM precipitation grids. Measurements of basin-average precipitation were made using ESRI's Flow Accumulation tool weighted by the PRISM precipitation raster (Daly et al., 2000).

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain: Precipitation in inches per year.

Attribute:

Attribute_Label: HUC12Name

Attribute_Definition:

The name of the Hydrologic Unit (which is also identified by 12-digit code) containing the CHAMP segment. Hydrologic Unit Names are adapted from Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987, Hydrologic Unit Maps: U.S. Geological Survey Water-Supply Paper 2294, 63 p.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain:

Unique geographic names. A CHAMP segment was considered within a Hydrologic Unit if the segment's midpoint fell within the boundary of the unit's polygon.

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: elev_up_ft

Attribute_Definition: Elevation in feet above sea level of the upstream segment end

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Elevation extracted from US Geological Survey (USGS) 30-meter DEMs. Reported in feet above sea level.

Attribute:

Attribute_Label: up_hydroid

Attribute_Definition: Identification number of the segment directly upstream

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers identifying the segment directly upstream. These numbers correspond the the [hydroid] of the segment directly upstream. At segments directly downstream of tributary junctions, the field identifies the hydroid of the upstream segment with the greatest drainage area.

Attribute:

Attribute_Label: vwidth_ft

Attribute_Definition: Measured valley width in feet.

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

For each CHAMP stream segment, valley width was measured using the following procedure in ArcGIS: 1. Using the Transect Generation Tool (part of the Channel Migration Toolbox developed at Ecology; see Ecology publication 14-06-032 (2014)), transects were drawn perpendicular to the stream network at a spacing of 0.5 times channel width at mean annual flow (typically 10 transects per stream segment). 2. A point was created at the intersection of each transect with the stream network. 3. The ground elevation was extracted at each point from the 30-meter DEM. 4. A vertical height, h, of 8.5 (see discussion below and Figure A 1) times channel depth at mean annual flow was added to the elevation (extracted in previous step) of each point. 5. An elevation raster was interpolated according to the elevated values calculated in the previous step (see Figure A 1 in Ecology publication 14-06-003). This step essentially created a smooth surface that intersected the actual valley wall at some distance from either side of the stream line. These two intersection points are referred to as VWa and VWb in Figure A 1 in Ecology publication 14-06-003. 6. At each transect generated (see Step 1 above), the distance between intersection points VWa and VWb was measured as valley width (Figure A 1 in Ecology publication 14-06-003). 7. Transect valley width measurements (usually 10) were averaged for each stream segment. Ecology arrived at the height value (h) of 8.5 multiples of channel depth (see step 4 above and Figure A 1 in Ecology publication 14-06-003) through a trial and error calibration process. We first manually measured valley width at 50 randomly selected points in ArcGIS. At multiple values of h (in multiples of channel depth), Ecology compared manually measured valley widths to those measured using the above automated routine. The height value of 8.5 times channel depth compared well with manual measurements. At this value, linear regression produced a regression line with a slope of 1.00 (R2= 0.95) between manual and automated measurements, suggesting a good agreement between the two.

Attribute:

Attribute_Label: seg_lth_ft

Attribute_Definition: Segment length in feet

Attribute_Definition_Source: Ecology

Attribute_Domain_Values:

Unrepresentable_Domain:

Line segment length was scaled according to predicted channel width [cwid_ftmaf] at mean annual flow [maf_cfs_v]. According to regression equations discussed below, Segment lengths are defined as 60.5 times predicted channel width (predicted at the midpoint of each stream network link). This length was defined with the goal of including multiple meander wavelengths in each segment. According to Leopold and Wolman (1960), meander wavelength is approximately 11 times channel width. Thus, segments of the defined length should include approximately 5.5 meander wavelengths. This approach of defining segment length by multiples of channel width is similar to methods by Clarke et al. (2008).

Attribute:

Attribute_Label: str_ord

Attribute_Definition: Stream order using the Strahler (1957) method

Attribute_Definition_Source:

ESRI, automatically generated using Spatial Analyst --> Hydrology tools

Attribute_Domain_Values:

Unrepresentable_Domain:

Integer values defining the stream order using Strahler's (1957) methods

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Rich Kim

Contact_Position: Spatial Database Administrator

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-6121

Contact_Electronic_Mail_Address: rich.kim@ecy.wa.gov

Hours_of_Service: 8:00-17:00, Monday-Friday

Distribution_Liability:

https://ecology.wa.gov/About-us/Accountability-transparency/Our-website/Copyright-information

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://fortress.wa.gov/ecy/gispublic/DataDownload/SEA_WAT_CHAMP.zip

Metadata_Reference_Information:

Metadata_Date: 20190611

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Washington State Department of Ecology

Contact_Person: Rich Kim

Contact_Position: Spatial Database Administrator

Contact_Address:

Address_Type: mailing

Address: PO Box 47600

City: Olympia

State_or_Province: WA

Postal_Code: 98504-7600

Country: US

Contact_Voice_Telephone: (360) 407-6121

Contact_Electronic_Mail_Address: rich.kim@ecy.wa.gov

Hours_of_Service: 8:00-17:00, Monday-Friday

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Use_Constraints:

Generally, this data layer should be used to screen and prioritize stream reaches for further channel migration evaluation. The data resolution does not allow one to predict channel migration. The classification identifies stream segments for further examination, and those that likely require limited attention or analysis. The potential uncertainty involved in the classification approach is a reason for the visual assessment techniques (described below in Ecology Publication 15-06-003) being described along with the CHAMP data layer. The Washington State Department of Ecology provides these geographic data "AS IS" WITHOUT A WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR USE, AND/OR NON-INFRINGEMENT.