Introduction

A decision support system (DSS), named AGRIRISK, is proposed as an add-on application integrated to the GIS version of the SWAT model (AVSWAT2000). AGRIRISK computes groundwater table depth and some risk indicators of interest in agriculture using SWAT inputs and outputs. The system has been conceived to compare soil units and management scenarios based on groundwater table depth and hydrologic indicators along with cumulative frequency curves, which are the tools to quantify and communicate the risk during the decision-making process. At watershed level, AGRIRISK performs NPS pollution risk analysis computing the exceedence probability plots for nitrogen, phosphorus and pesticides load in streams. In addition, AGRIRISK includes a module to compute statistical validation of SWAT output variables at subbasin level and groundwater table depth in order to save time and effort during the model calibration process. An Alpha version is recently available to be tested and a Beta-Version will include cumulative frequency curves and NPS Pollution Risk analysis.

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