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LOCAL GEOSPATIAL TOOLS FOR WATERSHED ASSESSMENTS
Frank Perchalski

Rural counties can easily apply today's geospatial technologies for rather sophisticated planning activities. It can be done locally and at little expense. A key element is using "other peoples" data. One source of that other data is a very comprehensive collection of downloadable natural resource and environmental data at the USDA's Geospatial Data Gateway. At that site, a number of data sets are available; but for our purposes, we'll illustrate what can be done with the topographic and aerial photographic data downloads. The assessment methodology consists of the following steps:

  1. Defining drainage ways and watershed areas of interest using the downloaded topographic data
  2. Inventorying pertinent land uses and land covers within a watershed using the downloaded digital orthophotographic data
  3. Assessing the water quality impacts of the inventoried features
  4. Ranking subwatersheds based on the cumulative impacts in the subwatersheds
  5. Targeting those subwatersheds and individual land use activities where further actions would have the maximum positive results
  6. Approach land owners in the targeted subwatershed areas as potential cooperators in future remediation and preservation activities

This may sound daunting for a rural county or rural watershed study group; but, it can actually be easily done, except for the last step, from the convenience of your home PC. All that is needed is access to the Internet and some inexpensive GIS software.