Morphometric Analysis Using SRTM-DEM and GIS of Nagar River Basin, Indo-Bangladesh Barind Tract

Conceptualisation of geo-hydrological characteristic of a drainage basin quantitative measurement of morphometric parameters has been required. Assessment and understanding the hydrological characteristics of Nagar River Basin morphometric analysis has been carried out. Remote sensing and ArcGIS techniques have been used for measuring and calculating the morphometric characteristics of the Nagar River Basin. Total area of Nagar River Basin is 2381.69 sq.km with dendritic drainage pattern. This stream frequency of the Nagar River Basin is 0.09 km/sq.km. Probability of flooding is quite high with intense rainfall in dendritic type of drainage system. Monsoonal rainfall is the main cause for the formation of stream segment. Very coarse drainage texture has been found in this Nagar River Basin with T value 0.04. This river basin is highly elongated in nature. The presence of a large number of stream segments exhibits the soil erosion in this study area by surface runoff, and the eroded materials deposited into the river bed aggregated channel depth causing flooding in rainy season. Flood is one of the major natural hazards having massive damage every year all over the world. For constructing flood vulnerability mapping of Nagar River Basin, AHP method has been used by compiling some morphometric parameters with other flood-influencing factors of Nagar River Basin. It can be concluded that the lower portion of the Nagar River Basin is highly vulnerable to flooding.