The adversely changing climate, Land Use Land Cover (LULC) and its impact has become global issue in hydrology of mountainous region. A part of dun valley area of Dehradun, i.e., Asan river watershed has seen significant changes in urban landscape in last 15 years. To assess the effect of these changes on hydrological components, an integrated hydrological modeling approach will be needed. Soil and Water Assessment Tool (SWAT) hydrological model has wide spectrum of capabilities to deal with various hydrological, water and land management scenarios. Until 2014, SWAT model required commercial software ArcGIS as GIS interface for running its hydro processing and core water balance modules, whereas, most of the organizations which are involved in hydrology based projects have limited budget. To encourage the expertise and capability of user, open source softwares and tools designed and have similar capability without expenditure. In the present study, QSWAT an open source tool plugin which work with QGIS software, has been used for the estimation of snow melt, surface runoff and sediment estimation in the Asan watershed, Dehradun District, Uttarakhand. QGIS-QSWAT has been used for creation of watershed parameters from ASTER GDEM (30m), and different Climatic layers, Soil and LULC are generated as the model input. Results shows, the magnitude of flood peaks will be visualized as a simulation and other parameters will be seen as thematic layers. Continuous daily simulations of hydrological components of Asan watershed was successfully done from 1999 to 2014 using NCEP and ground based climatic data. Calibration and validation was done for years 1999-2004 and 2005 to 2010 respectively. This preliminary analysis will be taken as a reference for the engineers and planners. Key Words: Hilly watershed, open source hydrological model, SWAT, FOSS, QSWAT
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