http://www.iaeme.com/IJCIET/index.asp 283 editor@iaeme.com International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 7, July 2017, pp. 283–294, Article ID: IJCIET_08_07_031 Available online at http:// http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=8&IType=7 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed STREAM FLOW NON-SOURCE POLLUTANT ANALYSIS USING SWAT MODELLING Abhinav Wadhwa Centre for Disaster Management and Mitigation VIT-University, Vellore - 632014, T.N., India. B. Srimuruganandam and K. Pavan Kumar School of Civil and Chemical Engineering, VIT-University, Vellore - 632014, T.N., India. ABSTRACT Understanding the source and type of pollutants during the flood events of a stream play a key role in decision making for estimating and controlling river pollution. During high floods, the non-source pollutants get washed through the drains and then enter the main stream. This brings a high anxiety over stream water quality improvement and regulatory decision. Soil and Water Assessment Tool (SWAT) is one among the techniques for deterministic, continuous, watershed-modelling to the pollutographs and load graphs, thereby, estimating the ecological changes in a water stream. SWAT modelling gives definitive idea about the pollutant and flow characteristics to optimally and effectively manage existing drains to bring the pollutants concentration to minimal amount during high flood conditions. A sub-basin of Thamirabarani region, with an area of about 10.18km 2 , is analyzed for pollutant concentration from 2016 to 2017, to identify and rectify the sub-basin with maximum pollutants and the reasons for the same. In this study it was found that, the amount of N and P pollutants depends on the vegetation cover, land parcel changes, areal extent of precipitation, built up area and semi-arid region corresponds to discharge of sediments to main stream. Key words: SWAT, NPS, Water Quality Monitoring, Statistical Tools, Types of Pollutants, NDVI, NDWI, NDBI, DEM Cite this Article: Abhinav Wadhwa, B. Srimuruganandam and K. Pavan Kumar, Stream Flow Non-Source Pollutant Analysis Using Swat Modelling, International Journal of Civil Engineering and Technology, 8(7), 2017, pp. 283–294. http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=8&IType=7