Urbanization and the effect on watershed hydrology
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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

Chris Maxwell-Gaines

Community and Regional Planning


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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


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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


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Land use circa 1980

Legend:

Residential

Commercial / Industrial

Undeveloped / Open Space

Transportation

Mining

Water

Bull Creek

Source: EPA - LULC


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Land use circa 2003

Land use for 2003 had to be consolidated for comparison with 1980 data

Bull Creek

Source: City of Austin



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Intersection of 1980 Land Use and Bull Creek gage watershed

Bull Creek

USGS Stream Gage:

08154700 Bull Creek at Loop 360


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Intersection of 2003 Land Use and Bull Creek gage watershed

Bull Creek

USGS Stream Gage:

08154700 Bull Creek at Loop 360


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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




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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


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Representative Storm Events

  • Storm events isolated to one day events

  • Attempted to match precipitation level

  • Will examine more storms for final report



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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


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Questions?Preguntas?


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