Abstract
Purpose: This study intends to carry out the assessment of an earth fill dry dam safety for flood control from the perspective of hydraulic points of view. Theoretical reference: Ciawi dry dam is the first dry dam built in Indonesia and has been operated since end of year 2022. The dam intends to reduce Q50 flood in Ciliwung River, it is design to reduce the peak flood and extend the peak of flood in Jakarta. Method: The methodology consists of by carrying out the experiment in hydraulic laboratory test by 1:50 scale; then using the software of FLOW-3D for analyzing the numerical modeling. Some design discharge was evaluated and researched for the scenarios as follow: 2(two) gate openings, 1 gate opening and 1 gate close. Result and Conclusion: The result shows that there is a good method between theoretical formula, numerical simulation and physical modeling. Implication of research: The location of spillway is separated from bottom outlets, it is placed at left side of abutment, it is an ogee type side spillway while the bottom outlets located in the right side of abutment with two conduits which to allow the inspection or maintenance during the operation is mainly designed at original bed level and to be able to pass through the sediments inflow naturally during the flooding periods. Both structures are designed to meet the dam safety in the perspective of the hydraulic issue. Originality/ value: The comparison between laboratory test and the Flow-3D software is done by a scenario with one gate opening and one gated close by using the PMF discharge to confirm the satisfactory of dry dam outlet capacity.
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