Faizal Immaddudin Wira Rohmat
Many rivers have been damaged by the speed of the river flow. Rivers are often used as a water source for agriculture, transportation, electricity, and many more. One of the causes of riverbanks' damage is scouring the cliff's foot, which cannot withstand scouring currents. If not addressed immediately, it will cause more severe damage. Citarum River is one of the rivers that pass through Atirompe Village, Majalaya District. The riverbanks in the area has a risk of cliff failure. The study objective was to analyze the problem, to design the protection, and to calculate the budget. The hydrology and riverbank analysis of the Majalaya River have been carried out. The steps are important to analyze the depth and width of the scour caused by the flow of the Citarum river water. Sediment data collection was taken at three locations, namely the upstream, middle, and downstream of the river segment that will be reviewed. In data processing, to obtain a sediment rating curve, it is necessary to measure the flow velocity, which will later be calculated and used as the flow rate that flows during TSS data collection. Using the HEC – RAS 6.2 software, a comparison of the calculations with the Ripley Equation was carried out to obtain the scour depth. For the design alternative, the construction of a steel sheet pile-type cliff protection structure is one form of planning to protect riverbanks. Using standardized unit price, the total price for the protection is 1,8 billion rupiah.