Erosion Patterns in Austin Streams

GIS Term Project Fall 2002

Background Phase 1 Watersheds Study Area Map

 City of Austin study  Previous Research  Flooding vs. Erosion City of Austin, 1997

Erosion Endangers Property

Past Channel Expansion in Little Walnut Creek Source: Raymond Chan & Associates, October 1997

Erosion Affects Water Quality

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

Erosion Processes

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

Erosion Processes

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

Austin Erosion Assessment

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

GIS Data Input