SWASH (te Roller et al, 2015) is a management and communication tool for the 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). 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.


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