Urbanization and the Effect on Watershed Hydrology

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Presentation transcript:

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 Compare stream flow to storm events Calculate results I wanted to locate watersheds that had a certain dominance of land use change over time (nearly all residential or commercial, etc) Review available data to find watershed with historical stream flow data and near the suburban edges of the city Download data and delineate watershed from the USGS gage Intersect land use layers with new watershed and calculate change in LU areas Compare storm events to stream gage response Calculate results

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

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

GIS layer from COA doesn’t match delineation

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

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

Consolidation of Land uses We have all of this wonderful LU data, but I had to dumb down the land uses to the 1980’s level.

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

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

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

USGS Stream Flow Data

Precipitation Record for Bull Creek

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

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

Extreme Storm Events

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 Intensity of rainfall does have a tremendous effect. Isolate single day storms rather than multiple day rainfall events.

Questions? Preguntas?