a case study of Telia watershed, Orissa, India Giri, Mahitosh creator Saeed, Khalid Chairperson Sheng, Liang Co-Chairperson Murty, V.V.N. Examination Committee Government of Sweden Scholarship donor text Bangkok Asian Institute of Technology 1994 monographic

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123 leaves In ancient time agriculture was thought of as protector of nature, that is to say Green, but now a days excessive agriculture, with the use of fatal pesticides and fertilizer to meet the huge demand of food supply, it pollute t he nature instead of protecting it . Nonpoint agricultural pollution are t he diffuse type of pollutant that follows a tortious path from t he soil to water . During the course of movement partial deposition takes place, so its concentration in contributing pollution to the waterbody is not constant. The nonpoint sources pollution generated due to the agricultural activities, are sedimentation, nutrient losses due to excessive fertilizer application, and from feed lot operation etc. Water pollution caused by nonpoint sources are very difficult to assess and control. The study is an attempt to identify the area contributing nonpoint source agricultural pollution and to zone the watershed according to their severity. Zoning critical area contributing nonpoint source pollution is the primary tool for planning and controlling pollution. Zoning is assessed by integrating AGNPS Model (Agricultural Nonpoint Source Pollution Model ) with GIS technology. The whole watershed is divided into the grid cells and the Agnps model is used to determine the approximate sediment, nitrogen and phosphorus input from the various cells of the watershed to the Telia river and to identify t he critical area. An approach is made to compare the cost effectiveness of the two alternatives with the existing one . The study shows t hat the conservation tillage practice is efficient in reducing soil loss but it increase the nutrient yield . It also required high investment and gives less return . The conventional tillage practice with strip cropping reduce the nutrient loss by incorporating the nutrient into the deep soil but results high soil loss. The study also demonstrate that the steep sloped and loamy soil are major source of sediment yield. The present landuse pattern has to be changed in order to control further degradation of soil as well as water quality. The study also exhibit potential use of hydrological NPS modeling and GIS technology for creating a data base that is useful for nonpoint sources pollution control planning and determining the strength of BMP to control NPS pollution . A thesis submitted in partial fulfillment of the requirements for the degree of Mast e r of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1994 Nonpoint source pollution India Orissa Geographic information systems Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16995 http://203.159.5.9/ait-thesis/detail.php?q=B16995 20260818132152.0