ABSTRACT
Land and water are two most vital natural resources of the world and these resources must be conserved and maintained carefully for environmental protection and ecological balance. Prime soil resources of the world are finite, non-renewable over the human time frame, and prone to degradation through misuse and mismanagement. Use of mathematical models for hydrologic evaluation of watersheds and extraction of watershed parameters using remote sensing and geographical information system (GIS) with high-speed computers are the aiding tools and techniques for it. Agricultural Nonpoint Source Pollution (AGNPS) model is one such mathematical, hydrologic, distributed, event based model that is used as a watershed analysis tool for evaluating non-point source pollution from agricultural watersheds. AGNPS is an event based distributed model, which simulates runoff, sediment, and nutrient transport from agricultural watersheds. AGNPS model is proved to be a successful model for hydrologic evaluation of agricultural watersheds using remote sensing and GIS techniques in the sub-humid sub-tropical region.
