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Several hydrologic models have been used in South Florida,USA over the last decades.These models differ in complexity,application scale and their objectives..The USDA-Everglades Agro-Hydrology (USDA-EAHM) model is a field-scale model that can be used in conjunction with a regional-scale model and GIS databases to simulate agr-hydrologic conditions in the agricultural area in a large basin such as south Florida.The USDA-EAHM is an event-based,deterministic,physically-based,farm-scale model.The model simulate the following processes: soil water balance (infiltration,plant transpiration,soil evaporation,soil water redistribution,and seepage below root zone),plant growth (row-crop and fruit trees),Irrigation practices,soil erosion,farming practices (tillage,planting and harvesting),upward flux from shallow ground water table,subsurface water flow from the drainage canals,fate and transport of the agro-chemicals (nutrients and pesticides),dissipation/degradation of pesticide residues and their subsequent fate in aquatic ecosystems,and mitigation actions which might be taken to reduce exposure to pesticides.