RAINFALL RUNOFF MODELLING OF UPPER TUNGA BASIN WITH THE INTEGRATION OF ARC-GIS AND SWAT

Abstract

Runoff is a very important component of hydrological cycle. An effective management of land and water can only be achieved through complete understanding of their characteristics. This study involves hydrological modelling of Tunga sub –watershed by using Soil and Water Assessment Tool (SWAT) model, which is integrated with Arc-GIS software. SWAT requires various input data such as land cover/land use data, weather data etc. the model authentication will be verified by calibrating and validating with the field-measured discharged data of watershed. The various parameters like Elevation Model (DEM), slope derived from DEM, Land use /land cover
(LU/LC) soil data and temporal data for temperature and precipitation was used as input for the model to predict runoff at the catchment. The output was used to estimate the flow and its variation over the basin. SWAT stimulation is done for daily, monthly, and yearly basis to find out runoff for corresponding runoff. The performance of the model will be checked by parameters like R2
and NSE coefficients for both calibration and validation. The outcome of this study will show the effectiveness of the model for simulating the flows in a particular watershed.