Catchment Information System

Welcome to CatchIS

Virtual Session

Ground water pesticides

Protecting the ground water abstraction sources

The pesticide groundwater model, GWAT, predicts concentrations of pesticides impacting on abstraction boreholes following use of a specific compound on a specific crop. Results are presented as a 'risk assessment' based on the likelihood of concentrations being above 0.1 µg l-1, taking into account variability in pesticide characteristics and the spatial distribution of soils and crops across the source protection zone.

To run GWAT, first the crop/compound combination is selected, here Mecoprop on Grass.
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GWAT reveals the borehole result predictions for the Mecoprop on grass combination.
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The Gwat model legend.
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Ground water hotspots

Identification of spatial risk

The ground water hotspots model allows you to identify hotspots within any Area Of Interest (AOI), which are particularly vulnerable to use of a particular compound on a specific crop. The model integrates predicted volumes of recharge and masses of compound leached (based on the targetcrop cover data from EDL) within a 2 km x 2 km grid and presents the results across the AOI.

Similarly, the groundwater hostspots model can be run for one or more areas of interest (AOI) (three adjacent sub-catchments as shown here)
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