The Effect of The Effect of Urbanization Urbanization toto the the surface-water runoffsurface-water runoff

The comparison between the urbanized and undeveloped zones

OutlineOutline

Objective/Study area Data Sources Backgrounds Map Creation Analysis Question

1. Build a Basemap of the City of Austin

2. Apply the precipitation data (time-series) on the study areas

3. Compare the flow pattern in regards to the land cover

ObjectiveObjective

Study AreasStudy Areas

The Shoal Creek The Barton

Creek

1.1. Aerial Photo: Texas Natural Resources Information http://www.tnris.state.tx.us/update3.cfm?Tx_County_Name=Travis

2. 2. Land Cover: National Land Cover Institute http://landcover.usgs.gov

3.3. Digital Elevation Model: USGS Dataset

http://seamless.usgs.gov

4.4. Gage station data: USGS Dataset http://water.usgs.gov/GIS/metadata/usgswrd/XML/streamgages.xml

5.5. Stream Network data: City of Austin GIS Data Sets ftp://coageoid01.ci.austin.tx.us/GIS-Data/Regional/coa_gis.html

6.6. Precipitation Data: Hourly/Daily Rain Data from NOAA’s Forecast Systems

http://precip.fsl.noaa.gov/hourly_precip.html

Data SourcesData Sources

BackgroundBackgroundThe sources of flooding in Austin area1. Unique geographic and atmospheric condition2. Creeks3. Urban flooding4. Hurricane and tropical storms

The Land Cover of Austin, TexasThe Land Cover of Austin, Texas

Building a BasemapBuilding a Basemap

Watershed of both creeks

The completed BasemapThe completed Basemap

Gathering discharge and precipitation dataGathering discharge and precipitation dataUSGS Streamgage data Precipitation

data

AnalysisAnalysisSep. 7, 2002

Sep. 2002 Loop 360 SH71 Barton Spring Barton Lost Shoal

Day Discharge (cfs)

6 0.00 5.40 2.44 5.60 0.00 7 0.01 6.70 2.49 7.60 81.00

AnalysisAnalysis

Sep. 2002 Loop 360 SH71 Barton Spring Barton Lost Shoal

Day Discharge (cfs)

7 0.01 6.70 2.49 7.60 81.00 8 0.00 20.00 2.52 14.00 212.00

Sep. 8, 2002

AnalysisAnalysis

Sep. 2002 Loop 360 SH71 Barton Spring Barton Lost Shoal

Day Discharge (cfs)

8 0.00 20.00 2.52 14.00 212.00 9 0.00 32.00 2.53 33.00 9.10

Sep. 9, 2002

AnalysisAnalysis

ConclusionConclusion

The land cover largely influences the discharge rate and time to reach the peak point.

Soil layer

runoffrunoff

impermeable layer

QuestionQuestion

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