[American Society of Agricultural and Biological Engineers 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica - ()] 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica - Develop of the conceptual modeling of the environmental management of a complex swine farm in the Central Valley of Chile