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Urbanization and the Effect on Watershed Hydrology

Urbanization and the Effect on Watershed Hydrology. Chris Maxwell-Gaines Community and Regional Planning. Project Methodology. Locate appropriate watershed Download data Delineate watershed for stream gage Intersect land use layers Compare storm events to stream gage response

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Urbanization and the Effect on Watershed Hydrology

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  1. Urbanization and the Effect on Watershed Hydrology Chris Maxwell-Gaines Community and Regional Planning

  2. Project Methodology • Locate appropriate watershed • Download data • Delineate watershed for stream gage • Intersect land use layers • Compare storm events to stream gage response • Compare stream flow to storm events • Calculate results

  3. Description of Bull Creek • Creek length: 11 miles • Drainage area: 25 sq. miles (16,000 ac) • Drains to Colorado River at Lake Austin • Projected Population Growth: 2000: 43,709 2030: 69,716 Source: City of Austin

  4. Watershed delineation from DEM • Delineate watershed using USGS gage as an basin outlet • Delineation included West Bull Creek

  5. GIS layer from COA doesn’t match delineation

  6. Land use circa 1980 Legend: Residential Commercial / Industrial Undeveloped / Open Space Transportation Mining Water Bull Creek Source: EPA - LULC

  7. Land use circa 2003 Land use for 2003 had to be consolidated for comparison with 1980 data Bull Creek Source: City of Austin

  8. Consolidation of Land uses

  9. Intersection of 1980 Land Use and Bull Creek gage watershed Bull Creek USGS Stream Gage: 08154700 Bull Creek at Loop 360

  10. Intersection of 2003 Land Use and Bull Creek gage watershed Bull Creek USGS Stream Gage: 08154700 Bull Creek at Loop 360

  11. Change in Land Use • 1980 Land use was created from aerial photography – Not exact! • 2003 Land use data is more refined hence the inclusion of Transportation layer • Transportation was a land use in 1980 data but pertained to large highways and other facilities

  12. USGS Stream Flow Data

  13. Precipitation Record for Bull Creek

  14. Historical Precipitation for Bull Creek Identify storm events during these 3 years of similar precipitation Choose storm events that are large enough to cause noticeable rise in stream flow Storms larger than 1 inch

  15. Representative Storm Events • Storm events isolated to one day events • Attempted to match precipitation level • Will examine more storms for final report

  16. Extreme Storm Events

  17. Further Research for Project • Calculate storm run-off volume and normalize it to amount of precipitation • Perform statistical analysis • Review land use consolidations • Exam the precipitation and stream flow data closer

  18. Questions?Preguntas?

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