I am carrying out a research on flood hazard, vulnerability and risk assessment for a rural community in Nigeria using Remote sensing and GIS techniques. I'm looking specifically at 2 extreme flood scenarios in 1995 and 2000 respectively. interaction with the villagers prove that serious sedimentation has taken place in the major river there. This reduction in the channel volume puts them at risk of flooding anytime they experience a particular rainfall intensity. How can I estimate the degree of sedimentation in this river using GIS. More so, any other counsel that will help in this study is welcome. Thank you.