Ground Water Quality Assessment Using Unsaturated and Saturated Zone Models

by Dorothy Fisher Atwood, EMCON Associates, San Jose, CA, USA,
J. David Dean, EMCON Associates, San Jose, CA, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


The modeling work described here provides an assessment of the migration and fate of the pesticide aldicarb in typical Florida citrus applications with emphasis on the potential for leaching and ground-water contamination. The fundamental approach to this problem is to collect and analyze information on site-specific factors and chemical properties which affect the supply and transport of aldicarb through the soil to the ground water in the unsaturated zone and then to drinking water wells through the saturated zone. The site-specific information is used to delineate a number of scenarios in the unsaturated and saturated zone which represent the likely conditions for use of the chemical and where the fate and transport behavior of the chemical can vary significantly. Two models, PRZM (Pesticide Root Zone Model) and CFEST (Combined Fluid-Energy-Solute Transport), were chosen to represent the unsaturated and saturated zones respectively. After modeling was complete, the results were combined to predict the actual well-water concentrations.

Subject Headings: Groundwater pollution | Groundwater quality | Water supply systems | Water pollution | Water quality | Pesticides | Water supply | Florida | United States

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