Tanjung Emas harbour is one of strategic harbours in Indonesia, which is located in Semarang City. Several problems arise nowadays; the drainage channel capacity decreases due to lack of treatment, rainwater storage reduced, land subsidence and the rise of tide sea level. The flood control used is polder system that classified into several clusters. The research location is focused on the Cluster IV, which the right side of harbour area. According to the data, catchment area is 29.3 hectares, the lowest elevation area is in +0,5 m, the dike elevation is +2 m LWS. Then retention pond area prepared is 900 m² (0.3% of CA), retention pond depth - 2m LWS. Based on simulation using 20.3 m³/sec pump and rainfall intensity return period of 25 years 303 mm, fluctuation in water retention pond can be maintained in +0,5 m water level. It is recommended to add 0.3 m³/sec alternative pump. A pump of 30.3 m³/sec needs to be prepared. Based on the simulation, by Polder system, the flood problem in harbour area can be solved.

Tanjung Emas港口是印度尼西亚的战略港口之一，位于三宝垄市。现在出现了几个问题；由于缺乏治理，雨水储存量减少，地面沉降和潮汐海平面上升，排水渠道能力下降。所使用的防洪是划分为几个集群的圩田系统。研究地点集中在港区右侧的Cluster IV。据资料显示，集水区面积为29.3公顷，最低海拔面积为+0.5 m，堤坝海拔为+2 m LWS。然后准备的蓄水池面积为 900 m ² (CA 的 0.3%)，蓄水池深度 - 2m LWS。基于使用 20.3 m ^3的模拟/sec泵和25年303毫米的降雨强度重现期，蓄水池的波动可以保持在+0.5米的水位。建议添加 0.3 m ³ /sec 替代泵。需要准备30.3 m ^{3 /sec 的泵。}在仿真的基础上，通过Polder系统，可以解决港区的洪水问题。