Muddy floods often occur in Indonesia as a side effect of urban development. Flood and sediment control facilities have been so far developed separately. Flood is controlled by reservoirs, while sediment is trapped by checkdam. The objective of this paper is to develop an integrated system between flood control and sediment trap analytically. The system consists of detention pond equipped with perforated spillway tower. Optimization is carried out on the dimensions of spillway tower, the diameter, number and layout of perforation orifices to obtain the highest trapped sediment and flood peak reduction for a certain pond capacity. The research was conducted in the Meteseh sub-watershed, located in Semarang. The results indicated that the position and arrangement of the orifices in the spillway tower affect sediment trap, while their size and number affect the reduction in peak discharge. The proper size, number, posistion and arrangement of orifices on the spillway tower be able to trap sediment and reduce flood discharge as high as 80%, and 24% consecutively.

作为城市发展的副作用，泥泞的洪水在印度尼西亚经常发生。防汛防沙设施至今已分开开发。洪水由水库控制，而沉积物由检查坝截留。本文的目的是在分析上开发一个防洪和泥沙陷阱之间的集成系统。该系统由配备有孔溢洪道塔的滞留池组成。对溢洪道塔的尺寸、射孔孔的直径、数量和布局进行优化，以获得一定池容下的最高截沙量和降洪峰。该研究是在位于三宝垄的 Meteseh 子流域进行的。结果表明，溢洪塔孔口的位置和布置会影响沉淀池，而它们的大小和数量会影响峰值流量的减少。泄洪塔上孔口的大小、数量、位置和布置得当，能够截留泥沙，减少泄洪量高达80%，连续减少24%。