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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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Presentation on theme: "The Effect of Urbanization to the surface-water runoff The comparison between the urbanized and undeveloped zones."— Presentation transcript:

1 The Effect of Urbanization to the surface-water runoff The comparison between the urbanized and undeveloped zones

2 Outline Objective/Study area Data Sources Backgrounds Map Creation Analysis Question

3 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

4 Study Areas The Shoal Creek The Barton Creek

5 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

6 Background The sources of flooding in Austin area 1.Unique geographic and atmospheric condition 2.Creeks 3.Urban flooding 4.Hurricane and tropical storms

7 The Land Cover of Austin, Texas

8 Building a Basemap Watershed of both creeks

9 The completed Basemap

10 Gathering discharge and precipitation data USGS Streamgage data Precipitation data

11 Analysis Sep. 7, 2002 Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 60.005.402.445.600.00 70.016.702.497.6081.00

12 Analysis Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 70.016.702.497.6081.00 80.0020.002.5214.00212.00 Sep. 8, 2002

13 Analysis Sep. 2002Loop 360SH71Barton SpringBarton LostShoal DayDischarge (cfs) 80.0020.002.5214.00212.00 90.0032.002.5333.009.10 Sep. 9, 2002

14 Analysis

15 Conclusion The land cover largely influences the discharge rate and time to reach the peak point. Soil layer runoff impermeable layer

16 Question ?

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