PMEP Home Page --> Pesticide Fact Sheets and Tutorials --> Protecting Groundwater: A Guide for the Pesticide User --> Geological Conditions

Geological Conditions

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Permeability of the geologic layers between the soil and groundwater is also important. Highly permeable materials, such as gravel deposits, depicted on the left, and highly fractured rocks, depicted on the right, allow water and dissolved pesticides to move freely downward to groundwater. Layers of clay, on the other hand, are much less permeable and thus inhibit water movement.

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