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Generating Model Input with GIS

Generating Model Input with GIS. The key elements for creating appropriate model inputs for rainfall-runoff models: Input parameter requirements Available data sources GIS tools & functions Data formatting for model entry. Input data requirements for TR-55. Watershed location

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Generating Model Input with GIS

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  1. Generating Model Input with GIS • The key elements for creating appropriate model inputs for rainfall-runoff models: • Input parameter requirements • Available data sources • GIS tools & functions • Data formatting for model entry

  2. Input data requirements for TR-55 • Watershed location • Land cover/land use • Soils – hydro group • Time of concentration • Watershed length • Watershed land slope • Flow type(s) (sheet flow, overland, channel) • Manning’s n • Channel info • Channel dimensions • Stream velocity • Stream reach data • Length • Manning’s n • Slope • Channel dimensions • Structure data • Stormwater pond dimensions • Outlet characteristics

  3. Default parameters for TR-55 • Precipitation data (set rainfall returns) • Set event duration (24 hrs) • Rainfall distribution • Unit hydrograph • Curve numbers by land use >>>Are these values or settings appropriate for my location???

  4. Available data sources • UVM GIS storage: \\zoofiles\gisdata • Vermont Center for Geographic Information http://www.vcgi.org/dataware/ • Vermont Mapping program (ortho and aerial photos) http://www.state.vt.us/tax/mappingcoverage.shtml • UVM Map library • Various national agencies/data sources: • USGS, NWI, Census/TIGER, etc • National Geospatial Data Clearinghouse • Resources constantly changing, improving, growing!

  5. GIS tools & functions • Geographic extent • Selecting data • Exporting new data sets • Clipping • Data projections • Joining/merging data • Conversion tools • Vector to raster, raster to shape files, etc. • Raster calculations • Reclassify • Simple math functions • Tabulate areas • Arc Hydro capabilities • Watershed delineation • Flow paths • Slopes

  6. Data formatting for model input • Specific file formats or structure • ASCII • .dbf • Grid layers • Manual entry (TR-55) • Proper units !

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