1. Generating Model Input with GIS zThe 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 zWatershed location zLand cover/land use zSoils – hydro group zTime of concentration  Watershed length  Watershed land slope  Flow type(s) (sheet flow, overland, channel)  Manning’s n  Channel info Channel dimensions Stream velocity zStream reach data  Length  Manning’s n  Slope  Channel dimensions zStructure data  Stormwater pond dimensions  Outlet characteristics

3. Default parameters for TR-55 zPrecipitation data (set rainfall returns) zSet event duration (24 hrs) zRainfall distribution zUnit hydrograph zCurve numbers by land use >>>Are these values or settings appropriate for my location???

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

5. GIS tools & functions zGeographic extent  Selecting data  Exporting new data sets  Clipping zData projections zJoining/merging data zConversion tools  Vector to raster, raster to shape files, etc. zRaster calculations  Reclassify  Simple math functions  Tabulate areas zArc Hydro capabilities  Watershed delineation  Flow paths  Slopes

6. Data formatting for model input zSpecific file formats or structure  ASCII .dbf  Grid layers zManual entry (TR-55) zProper units !