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Impact of Urbanization

Impact of Urbanization. In the City of Austin. Bryan Barnett. Overview. Atrophic Effects on the Hydrologic Cycle Potential Effects on the Surface Excessive Run-off High transport of pollutants Potential Effects Underground Leaks allow infiltration

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Impact of Urbanization

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  1. Impact of Urbanization In the City of Austin Bryan Barnett

  2. Overview • Atrophic Effects on the Hydrologic Cycle • Potential Effects on the Surface • Excessive Run-off • High transport of pollutants • Potential Effects Underground • Leaks allow infiltration • Storm water can penetrate the earth much more quickly

  3. Goals of My Project • Utilize Available Land Use Datasets, USGS Data • Use a variety of catchment processes to identify correlations between rate of catchment urbanization, surface discharge and well level • Identifying trends will fortify the theory of Antropic recharge enhancement Based on Thesis “Urban effects on groundwater recharge in Austin, Texas,” by Beatriz Garcia-FrescaGrocin, 2004

  4. Methodology • Utilized USGS Station Data, Land Use Comparisons, NOAA Precipitation Records and NHDPlus Catchment and Stream Datasets http://www.mrlc.gov/faq.php#changeproduct NHDPlus Products From http://www.horizon-systems.com/nhdplus

  5. Methodology Continued… • Used Stream Networking to Delineate Surface Flow Catchment Areas of USGS Stream Gauges • Well Data was compared to three different catchment regimes: Local, Extended Local and Losing Stream Local: Surrounding Catchment Extended: .03 Degrees Away Losing Stream: Typical Watershed

  6. Results- Annual and Multi Year Averaging • Surface Data- Surface Percent Seemed to Trend to Precipitation % • Well Data- Strongest Correlation Found in Local Catchment Regime

  7. Challenges… • Scarcity of Data- Never enough gages! • Ignorance of Powerful Statistical Tools • Understanding the complexities of Dataset Manipulation and Representation

  8. Conclusion • ArcGIS combined with USGS Data is a powerful toolset for investigating local hydrogeology • With even better data, this research could have significant implications for city planning or environmental regulation • Land Use is just one component of anthropogenic effects on the hydrologic cycle. • Keeping your personal geodatabase organized and clean is difficult but IMPORTANT!

  9. Questions

  10. Appendix- How to get % Urban • Create Stream Networks, Other Catchment Polygons • Create Catchment Rasters (Value = 1), parse out data • Convert Parsed Land Use Rasters to Polygons • Use Spatial Analyst Tools/Zonal/Tabulate Area • Requires Text String Identifiers • Append resultant table to Catchment Polygons • Relate USGS Datasets to Catchments, with Land Use Areas appended • Export to Excel for graphing and analysis

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