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Track: Environmental Management
Ann Rodman
Spatial Analysis Center
P.O. Box 182
Yellowstone National Park, WY 82190
Telephone: 307-344-2216
Fax: 307-344-2211
E-mail: ann_rodman@nps.gov
Eric Compas, Skip Repetto
Using GIS To Predict Pesticide Leaching and Runoff for Different Soil Types within Yellowstone National Park
Defining Issue: In order to prevent surface and groundwater contamination, it is necessary to know the leaching and runoff potentials of a pesticide for all the different soil types where it might be applied. Unfortunately, soils vary across the landscape and determining leaching and runoff potentials is complicated. GIS Solution: Layers of different soil properties (clay content, organic matter, etc.) are created in ArcInfo from a digital soil survey. These layers are combined based on pesticide/soil property relationships developed by the National Resource Conservation Service. Two new layers are created for each different pesticide type, "leaching potential" and "runoff potential." A custom application is created in ArcView that combines these layers with a map of exotic plant infestations. This allows users to identify problem areas where special application techniques should be used to reduce the risk of contamination. The chance of a disaster is much less and budgets and schedules are more
accurate. Software: The database, Paradox, is used to extract the soil property information from the soil database. ArcInfo is used to create digital layers of different soil properties. A set of rules written in AML combines the layers according to relationships between soil properties and pesticide behavior. Avenue is used to create the final, customized ArcView application for the end user.
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