This research intends to investigate the hydraulic and sedimentation behavior on the single meandering river by developing shortcut of 90o and to know the effect of each flow discharge parameter and sediment material in changing process of river bed. The methodology consists of physical model test in Hydraulic Laboratory and mathematical modelling with the condition as follow: the angle of corner is 90o, flow depth: h = 2, 2.5, 3, 3.5 cm, the flowing duration: t = 20 minutes, and the material is easily eroded. The result shows that the making of corner is very affecting the decreasing of water level.