Version 1.1, May 1996
This CD-ROM contains a number of Arc/Info coverages and grids prepared as part of the PhD dissertation research of Francisco Olivera. Some of the data presented are copies of coverages supplied by the City of Austin, but most of the data are from public domain sources which have been processed into a consistent format so as to support analysis of water quantity and quality questions using GIS based hydrologic methods.
All coverages and grids are in State Plane coordinates unless otherwise specifed. Coverages and grids are the result of importing interchange-files with the workstation version of Arc/Info. If, when working with a PC, you experience problems (e.g. losing some numbers of the tables), import the corresponding interchange-files (.e00 files) with the PC ArcView-Import utility. Interchange-files are also included in the CD-ROM. [Gr] = Grid, [AC] = Arc Coverage, [PC]= Polygon Coverage, [pC] = point coverage.
Copies of the CD-ROM can be obtained from the Center for Research in Water Resources, University of Texas at Austin, tel: (512) 471-3131. For information about the data, contact Francisco Olivera at paco@crwr.utexas.edu.
The following listing describes the contents of each section of the CD-ROM and provides some sample graphics.
Data in this directory were supplied by the City of Austin. Coverages include:
This directory contains grids that were created by applying the Arc/Info Grid tools to the 3 arc-second digital elevation model (DEM) of the land surface terrain in the Austin area. The original DEM data are contained in directory DEMS. The cell size in these grids is 308 ft x 308 ft.
This directory contains grids and coverages similar to those of the DEMS and DELN directories, but based on a 30m DEM developed by Analytical Surveys, Inc.. At present, digital data is available only for the Pflugerville West, Austin East, Montopolis and Creedmoor 7.5' quadrants.
This directory contains the basic Digital Elevation Models (DEM) that were used for the watershed delineation. This directory contains two subdirectories:
SubDirectory AUSLLA This subdirectory contains DEM's of the Austin West and Llano East map sheets.
FEWS stands for Flood Early Warning System, which is a set of stream gages with telemetering devices on them so that rainfall and stream flow can be monitored continuously during floods.
Land use data obtained from different sources.
Precipitation grids obtained by C. Daly et. al. of Oregon State University
Runoff coefficient based on land use, terrain slope type and hydrologic soil type.
Soil coverages according to the State Soil Geographic (STATSGO) database of the Soil Conservation Service - U.S. Department of Agriculture.
U.S. Geological Survey stations in the Austin Area