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SWASH is an acronym for Surface WAter Scenarios Help and is an overall user-friendly shell,
managing the communication and data transfer between three models involved in Step 3 calculations
for the FOCUS Surface Water Scenarios. These scenarios have been developed as part of the EU
evaluation process under 91/414/EEC (See
FOCUS Website: FOCUS, 2001).
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Spray drift, drainage and run-off are the routes of pesticide entry into surface waters.
Using spray-drift deposition tables and the MACRO, PRZM and TOXSWA models the exposure concentrations
in surface waters can be assessed. To carry out the FOCUS Surface Water Scenarios, a drift assessment tool
and two pesticide fate models have to be run in the correct sequence see figure
below.
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