Parent Layer: Debris Flow

Name: Countywide Debris Flow

Display Field: County

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: ABOUT THIS DATA:These polygons represent areas that may be susceptible to debris flows, especially during extreme precipitation events. New and existing structures, roadways, bridges, utilities, and other infrastructure located within these mapped debris-flow susceptible areas may be at risk of structural damage and/or sediment inundation. For new/proposed development within these areas, site-specific geologic hazard reports should be required prior to approval of land subdivision or the issuance of building permits. These reports should discuss the degree, limits, and potential impacts of the hazard to the proposed development or land use changes; proper debris-flow mitigation techniques; and feasibility of any recommended mitigation techniques.These polygons were compiled from various CGS Open-File Reports. Please refer to the original Open-File Report for additional information regarding mapping methodology and limitations of use.LIMITATIONS:These polygons depict generalized areas that may be susceptible to debris flows based on available GIS data and limited field observations in easily accessible areas. The polygons were generated at a scale of approximately 1:24,000 (1 inch = approx. 0.4 mi.) and are not valid if enlarged to scales greater than 1:24,000.The degree of susceptibility to a particular geologic hazard, in any given area, is related to ever-changing natural and human-induced conditions, and any alteration in the natural landscape may increase or decrease susceptibility to a particular hazard. The polygons are not intended to assign risk, or indicate the degree, severity, recurrence interval, or exact boundary of individual debris flows or debris-flow susceptible areas.Because of limitations associated with the mapping scale and the scope of this project, some areas that may be susceptible to potentially damaging but localized debris flows near the mouths of small gullies or at the base of steep slopes may not be included. Additionally, some higher-order streams in larger mountain valleys that have been mapped as debris flow susceptibility areas may be more likely to produce water floods than debris flows depending on local rainfall-runoff conditions and availability of erodible sediment and debris in the basin. Inclusion of existing structures and infrastructure within a mapped susceptibility area does not necessarily indicate that debris-flow impacts will occur, in only indicates that these features may be more exposed to debris-flow events than similar features located in other areas. This map should not be used in place of a detailed site-specific geologic hazard study.

Copyright Text: Polygons compiled by Kevin M. McCoy from various CGS Open-File Reports. Last updated December 14, 2018.

Default Visibility: true

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 24000

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: false

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 397188.63989688765
YMin: 4263284.53645925
XMax: 554759.8085505626
YMax: 4539331.992631943
Spatial Reference: 26913  (26913)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSFSSolid
Color: [255, 0, 0, 255]
Outline:
Style: esriSLSSolid
Color: [0, 0, 0, 0]
Width: 0
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• Shape_Area ( type: esriFieldTypeDouble, alias: Shape_Area )
• OBJECTID_1 ( type: esriFieldTypeOID, alias: OBJECTID_1 )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• County ( type: esriFieldTypeString, alias: County, length: 255 )
• Report_ID ( type: esriFieldTypeString, alias: Report_ID, length: 255 )
• Hyperlink ( type: esriFieldTypeString, alias: Hyperlink, length: 50 )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

  Iteminfo   Thumbnail   Metadata