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the Lamong River flood occurs every year due to the flow rate that enters the river is larger than its capacity. The storage capacity is reduced due to the sedimentation on the riverbed which results in a small storage capacity. Therefore, water overflows through the channel but is still held by the embankments on either side of the river. The embankment restraints flood so that the water level rises, inundates, and submerges the embankment from the bottom to the top of the embankment. The Lamong River with a trapezium-shaped channel has a bottom width of about 30 m, an upper width of 40 m and a depth of 3.5 m. In one of the river segments, the riverbed is in the form of a fixed bed and it is assumed that there is no sediment transport in this section. On the downstream side after the fixed bed section, the river segment is a mobile bed with riverbed material which has an average grain diameter of 1.5 mm, relative mass density of 2.6, and porosity of 0.3. The method of analyzing riverbed degradation was parabolic. In addition, the method of analyzing flood discharge was designed using HEC-RAS version 5.0 software. The analysis starts from normal water discharge to critical flood water discharge at the top of the embankment. The results showed that the flow rate with Q50 is 1000.00 m3/s with a maximum flow rate of 8,0 m/s and the degradation of the river bed occurred at the beginning at the upstream point in the fixed and mobile bed. The depth of riverbed degradation is 0.8 m/yr.

The Effect Of Lamong River Flow Diversion To Bed Surface Degradation