Changes in the base elevation in the jetty planning conditions decreased by 0.47% from the existing conditions, so there was a change in evelation for 1 year amounting to 0.06% - 29.73%. In the groundsill planning conditions an increase of 0.35%, resulting in a decrease in elevation of 11.56% - 30.55%. From the results of the SED2D modeling there was a change in the base elevation in the mouth of the river mouth with the existing conditions of 11.79% - 30.20%. The mouth of the Serayu river estuary has undergone a morphological change due to the presence of a sand spit that covers the mouth of the river estuary so that it experiences a diversion to the area. Slowing water flow causes sedimentation in the river mouth so that sedimentation occurs at the mouth of the river mouth. When the flow of water enters the estuary there will be a change or transition in the speed of the water flow. Muara Sungai Serayu is located in the Cilacap district, precisely in the Adipala and Kesugihan districts.
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