Parbin Nahar Begum and Eahya Al Huda
Abstract
The topographical wetness index (TWI) is a critical measure for understanding and modelling hydrological phenomena, particularly in regions susceptible to inundation and soil saturation. This study assesses the spatial distribution and variability of TWI across the Manas River Basin in Assam, India, employing a combination of DEM and GIS techniques. The basin, characterized by its diverse terrain and substantial rainfall, poses significant challenges in water management and flood mitigation. By integrating TWI with land use and rainfall data, we delineate areas prone to high wetness, contributing to enhanced flood risk assessments and better watershed management practices. The findings reveal distinct patterns of wetness concentrated primarily in the lower basin areas, which correlate strongly with historical flood events. These insights are pivotal for implementing effective land use planning and flood management strategies within the basin.