The River Ganga and its tributaries are important water resources for North India. It has its own ecosystem and also creates a unique biodiversity around its vicinity. In the past few decades, it has been found that the huge sediment deposits in the River Ganga basin and its tributaries. The flow area of these rivers is reduced and during the flooding, it inundates the large agriculture and urban areas. It caused a huge economic loss along with human death & displacement. A study was conducted to estimate the sedimentation rate in the flow areas of these river systems. Various scientific methods such as surface water modelling, and satellite imagery interpretation techniques have been used. The result obtained by the study indicates the continuous rise in sediment deposition occurring after the year ninety seventy-five and more than thirty percent of natural channels are under threat. The flow of the rivers is highly affected due to human intervention, especially in the downstream part of the river Ganga basin. Ignoring these activities may create a huge environmental, and socio-economical tragedy for those living in these areas. The method developed and the findings, of the study, are highly useful for estimating long-term river sediment assessment and policy development studies.