Tidal Analysis for Planning the Tidal Flood Management and the Moveable Weir, Case Study in Parit River, Kawunganten Cilacap

The seawater level always rises globally. Sea level rise has an impact on human life. One of the effects of rising sea levels is the tidal flood which is one of the adverse natural phenomena. Kawunganten District, Cilacap Regency is one of the areas affected by the tidal flood. The construction of the moveable dam is a solution to prevent damage to the region due to tidal flooding. In carrying out dam design planning required accurate tidal data. This study aims to obtain data and analysis of tides along the river to the river mouth. In determining tidal data, observations are made using an automatic survey tool called DIVER. The tidal analysis is done by applying the least square method to obtain the tidal harmonic constant at the study site. Base on observation data for 75 days, the results of tidal data analysis as a reference for planning flood management and moveable. The analysis gives the value of MSL (Mean Sea Level) of 0,996 m, MHWS (Mean High Water Spring) of 1,7 m, MLWS (Mean Low Water Spring) of 0,292 m, HHWS (Highest High Water Spring) of 1,992 m and LLWS (Lowest Low Water Spring) of 0,00 m as elevation reference for the infrastructure