Erosion Patterns in Austin Streams

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Erosion Patterns in Austin Streams

• GIS Term Project
• Fall 2002

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Background
Phase 1 Watersheds Study Area Map

• City of Austin study
• Previous Research
• Flooding vs. Erosion

City of Austin, 1997
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Erosion Endangers Property
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Past Channel Expansion in Little Walnut Creek
Source Raymond Chan Associates, October 1997
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Erosion Affects Water Quality
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Erosion Processes

• Fluvial Geomorphology
• The study of how the physical characteristics of
  a river or stream interact with the climate,
  geology, topography, vegetation and land use of
  the watershed

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Erosion Processes

• Dynamic Equilibrium
• Stable
• In Transition
• In Adjustment
• Regime Flows
• Land Use Changes
• Dams

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Erosion Processes

• Stream Classification
• Rosgen
• Channel Geometry vs. Basin Area
• City of Austin study
• Ratio of Expansion vs.
• Percent Impervious Cover

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Austin Erosion Assessment

• Stream Classification
• Stability Index
• Ratio of Enlargement
• Predicted Future Ratio
• Overall Problem Score

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GIS Data Input