Quantitative Hydrological Analysis Of West Banas River Basin, India

Abstract

Detailed hydrological analysis is carried out for the estimation of peak discharges at various locations of the basin and to assess the impact of factors that are driving the temporal change.West Banas basin has experienced frequent flooding with increased magnitude in last two decades.The goal of study is to accurately assess the response of catchment to the extent possible by developing different SWAT models specifically for monsoon months and the flooding years.Extraction of the basin and sub-basins, stream network is carried out on GIS platform.The entire West Banas River basin has been subdivided into 23 sub-basins.SWAT model is developed using rainfall and discharge data of 32 years The calibration results reveal a good performance of the model in streamflow simulation as indicated by the values of performance evaluation indices-R 2 , NSE and PBIAS.Different hydrological models are developed based on calibration of model using seasonal data such as monsoon and non-monsoon months as well as considering only flood, moderate or drought years.The model performance for each type of calibration scheme is analyzed and compared to determine optimum approach of seasonal calibration.The model developed for monsoon months produced better output in comparison to the models developed for all season months and non-monsoon months.Similarly, the model developed for flood years months gave better results in comparison to the models developed for moderate flood years and drought years.It is concluded that better flood analysis calibration must be carried out only using monsoon data.