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The Effect of Urbanization to the surface-water runoff The comparison between the urbanized and undeveloped zones
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Outline Objective/Study area Data Sources Backgrounds Map Creation Analysis Question
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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 Objective
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Study Areas The Shoal Creek The Barton Creek
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1. 1. Aerial Photo: Texas Natural Resources Information http://www.tnris.state.tx.us/update3.cfm?Tx_County_Name=Travis http://www.tnris.state.tx.us/update3.cfm?Tx_County_Name=Travis 2. 2. Land Cover: National Land Cover Institute http://landcover.usgs.govhttp://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.xm l http://water.usgs.gov/GIS/metadata/usgswrd/XML/streamgages.xm l 5. 5. Stream Network data: City of Austin GIS Data Sets ftp://coageoid01.ci.austin.tx.us/GIS-Data/Regional/coa_gis.html 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 Sources
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Background The sources of flooding in Austin area 1.Unique geographic and atmospheric condition 2.Creeks 3.Urban flooding 4.Hurricane and tropical storms
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The Land Cover of Austin, Texas
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Building a Basemap Watershed of both creeks
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The completed Basemap
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Gathering discharge and precipitation data USGS Streamgage data Precipitation data
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Analysis Sep. 7, 2002 Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 60.005.402.445.600.00 70.016.702.497.6081.00
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Analysis Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 70.016.702.497.6081.00 80.0020.002.5214.00212.00 Sep. 8, 2002
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Analysis Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 80.0020.002.5214.00212.00 90.0032.002.5333.009.10 Sep. 9, 2002
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Analysis
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Conclusion The land cover largely influences the discharge rate and time to reach the peak point. Soil layer runoff impermeable layer
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Question ?
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