Model Development

Waterborne has extensive experience with environmental fate models used by regulatory agencies in the US, Europe, Latin America, and Asia. We understand the underlying governing equations behind the models, and this informs our knowledge of model limitations, parameter sensitivity, and uncertainty. Therefore, we can not only recommend appropriate models, but we can also advance model technology to more accurately represent physicochemical processes.

Waterborne staff have contributed to the development of numerous hydrologic and water quality models, platforms, and tools. Some of these are listed below, including four models that can be downloaded from our website.

Global Use

Rice sprouts photo (c) Miya RICEWQ An agrochemical fate model for rice crops. Download the model.

RIVWQ An aquatic fate and transport model for evaluating flowing water scenarios. Download the model.

RADAR Statistical analysis of time history concentrations to characterize exposure concentration magnitude, duration, and inter-event recovery intervals. Download the model.

Although some of the models described below were developed for use in a particular area, they can also be used in other geographic areas. If you are interested in having Waterborne develop new scenarios for a model, please contact us.

United States

PRZM-3 US Environmental Protection Agency's Pesticide Root Zone Model, designed to evaluate nutrient and agrochemical leaching and runoff.

PLUS (PRZM-3 Leaching US) A national leaching assessment tool that evaluates chemical and water runoff and soil erosion regionally and across the US.

EXPRESS (Exams PRZM Exposure Scenario Software) A Tier 2 runoff assessment tool.

NPAT, National Pesticide Risk Assessment Tool is a Tier 2 runoff assessment tool for the US.

PIC3 A Windows-based platform that links a number of crop, soil, and climate databases to automate the creation of PRZM-3 input files.

VFDM (Vegetated Filter Ditch Model). Simulates water, sediment, and chemical mass balance, including chemical partitioning to plants and sediment, in vegetated drainage ditches. Download the model.

PIRANHA US Environmental Protection Agency's Pesticide and Industrial Chemical Risk Analysis and Hazard Assessment program, designed to evaluate runoff buffers and holding ponds for aquatic exposure assessments.

Europe

FGRAT (FOCUS Groundwater Risk Assessment Tool). A Windows-based platform to standardize and automate leaching assessments for EU Registration.

PRZM in FOCUS (FOCUS Surface Water Risk Assessment Tool) A Windows-based platform linking PRZM and TOXWA to standardize and automate aquatic exposure assessments for EU Registration.

The Drift Tool is a geospatial tool for use with modeling the spray drift of agrochemicals applied to crops.

Latin America

Colombian Exposure Model Calculator. A runoff assessment tool for Latin America (similar to EXPRESS). It is a modeling shell built around PRZM and EXAMS and includes several standard modeling exposure scenarios and datasets.

Asia

PRAESS (Pesticide Risk Assessment Exposure Simulation Shell). A modification of the EXPRESS modeling platform developed for the People’s Republic of China in conjunction with the Nanjing Institute of Environmental Sciences. Learn more about the PRAESS project.