View In:   ArcGIS Online Map Viewer

Name: Debris Flow Probability per 100 Years

Display Field: Tributary_Name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This dataset represents 740 tributary watersheds to the Colorado River in Grand Canyon with associated debris flow probabilities from 2004. It also includes tributary watersheds to Glen Canyon and several smaller watersheds in Grand Canyon where debris flow data is currently unavailable. Historic probabilities of debris flow occurrence were estimated by modeling the known frequency distribution with drainage basin parameters observed to control the process by which debris flows initiate and travel to the river. Observations from 1984 through 2003 provide a 20 year record of all debris flows that reached the Colorado River in Grand Canyon, and repeat photography provides a 100 year record of debris flows from 147 tributaries. Owing to the limitations of the initial datasets and the focus on geomorphic change in the river corridor, debris flow probabilities pertain only to debris flows that reach the Colorado River.

Copyright Text: Byerley, E.B and Gushue, T.M., We revived this 20 year old dataset by joining Griffiths and others (2004) debris flow probability table with a feature class representing watershed boundaries of ungaged tributaries to the Colorado River in Grand Canyon.

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YMin: 502860.2993000001
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YMax: 665287.1538999993
Spatial Reference: 102988  (6404)  LatestVCSWkid(0)

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Supported Operations:   Query   Query Attachments   Query Analytic   Calculate   Validate SQL   Generate Renderer   Return Updates   Iteminfo   Thumbnail   Metadata