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Precipitation-Runoff and Streamflow-Routing Models for the ...

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APPENDIX 11. DIRECTORY TREES AND DESCRIPTION OF DIRECTORY CONTENTS FOR DIRECTORIES USEDIN GEOGRAPHIC INFORMATION SYSTEM WORK—CONTINUEDbasin_lat - an arc lattice coverage of <strong>the</strong> entire basin with elevationdata. (note: basin_grid is a backup coverage with grids <strong>and</strong>lattices being identical)network-basin_lat - a lattice coverage <strong>for</strong> a specific subbasin when <strong>the</strong>entire area was not contained in one basin. (Whichjust occurs in <strong>the</strong> porsalem <strong>and</strong> aleugene basins)The individual subbasin <strong>and</strong> calbasin coverages were created by combining <strong>the</strong>basin_hru coverages <strong>and</strong> one of <strong>the</strong> basin_sub, _cal, or _net coverages in <strong>the</strong>gis_work directory. This was accomplished by using <strong>the</strong> basic steps whichfollow, <strong>and</strong> steps 2-5 can be used in <strong>the</strong> future if more changes are required.1. The GIS Unit’s coverage basins.utm was CLIPPED by each basin outlineto take advantage of any subbasins that may have already been digitized.2. New arcs were delineated on 15 or 7 1/2 minute Drainage Area Maps <strong>and</strong> <strong>the</strong>n<strong>the</strong> new arcs were digitized into <strong>the</strong> coverages. Each basin_sub was <strong>the</strong>nCLEANED <strong>and</strong> BUILT to eliminate any small sliver polygons.3. ADDITEM was used to give all subbasin polygons an attribute called“sub-id” which uniquely identifies each subbasin.4. The SPLIT comm<strong>and</strong> was <strong>the</strong>n used to “cookie-cut” <strong>the</strong> basin_hru coverageinto <strong>the</strong> separate smaller subbasins. It was used with <strong>the</strong> followinggeneral <strong>for</strong>mat:SPLIT basin_hru basin_sub(or _cal, or _net) sub-id poly 105. The small (less than 5% usually) sliver polygons were <strong>the</strong>n edited outof <strong>the</strong> new subbasin coverages, <strong>and</strong> <strong>the</strong>se final subbasins were <strong>the</strong>n CLEANED,BUILT <strong>and</strong> saved in <strong>the</strong> /deqbasin/final directory.173

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