Evaluasi Rancangan Elevasi Tinggi Muka Air pada Jembatan Tol Sei Wampu di Kawasan Sungai Sei Wampu

Abstract

One of the problems that often occurs at the project location is the problem of overflowing river water which causes flooding, including around the construction of the Sei Wampu TOL bridge where the biggest problem is floods that overflow when it rains, so that the construction of the TOL bridge on the Sei Wampu River requires calculations. The planned flood discharge and water level will influence the planning of the bridge structure. The data is then processed using hydrological analysis and hydraulic analysis. Hydrological analysis includes calculating regional rainfall using the Polygon Thiessen method, analyzing rain distribution using Log Pearson Type III, calculating rain intensity and flood discharge using the HSS Nakayasu method. Meanwhile, hydraulic analysis uses HEC-RAS (Hydrology Engineering Center-River Analysis System) 5.0 supporting software to calculate the water level elevation value on the Sei Batang Panggang Toll Bridge in the Sei Batang Panggang River Area. From the results of the analysis, rainfall and flood discharge values were obtained at return periods of 2, 5, 10, 25 and 50 years and it was found that the existing water level elevation value did not exceed the flood water level value (TMA<MAB)