Copyright © 2018 Airlangga Mardjono et. al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (3.29) (2018) 134-137 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Effectivity of kiwi and sukamahi dam on jakarta flood control Airlangga Mardjono 1 *, Pitojo Tri Juwono 1 , Lily Montarcih Limantara 1 , Ery Suhartanto 1 1 Water Resources Engineering, Faculty of Engineering, Brawijaya University, Malang, Indonesia commission on Large Dam (Inac- old), Jakarta, Indonesia *Corresponding author E-mail: ariemardjono234@yahoo.com Abstract Various infrastructures such as flood levees, dams and reservoirs of flood control began to be developed in the 19th century to the 20th century. These buildings are very effective in controlling the flow of rivers and preventing flood waters from entering residential areas located in flood-prone areas. Flooding in urban areas has a huge impact, covering all aspects of life as well as on the landscape. Ciliwung is one of the rivers that allegedly contributed to the problem of flood in Jakarta, various engineering done on Ciliwung to help control flooding in Jakarta. One of the engineering done is the construction plan of Ciawi Reservoir and Sukamahi Reservoir. In this research, the writer performed the flood calculation using Nakayasu while method of flooding is calculated using the pool routine level method. The effectiveness of these two reservoirs can be determined by simulating floods in the existing condition and comparing them with the flood simulation after the construction of the dam. The final test of this research is to determine the effectiveness level of Ciawi and Sukamahi dam infrastructure in reducing flood volume in Jakarta. Keywords: Effectivity; Flood Infrastructure; Flood Simulation; Pool Routing Level 1. Introduction Jakarta is the capital city of Indonesia, the city is located between 5 ° 19'12 '' - 6 ° 23'54 "LS and 106 ° 22'42" - 106 ° 58'18 "East lon- gitude with an average height of approximately 7 ASL (Above the sea level). Jakarta has an area of ± 664 km2 with a population of 9.6 million inhabitants who are in 2.2 million families in 2010[1]. As the administrative, governmental and economic center, Jakarta has developed very rapidly to the surrounding buffer zone. The Cili- wung River is one of 13 rivers that passes through Jakarta and emp- ties into the Java Sea. In addition, this river is a very influential river in Jakarta. Ciliwung has a river length of 120 km, with a watershed area of 400 km2. The Ciliwung watershed is one of the watersheds in Indonesia that falls into the watershed category with critical con- dition [2]. This is due to the transfer of land function in the upstream area from its initial function is as a catchment area into tourist areas and settlements. Of the 13 rivers flowing in DKI Jakarta, the Ciliwung River has the greatest impact during the rainy season as it flows across many vil- lages, densely populated housing, and slums. From population sta- tistics of DKI Jakarta, it is known that the people who live on the banks of the River Ciliwung for 350,000 people with the number of buildings as many as 70,000 units. The river is considered a river that suffered the worst damage compared to other rivers in Jakarta and has the potential to cause flooding in Jakarta. Flood is one of the disaster that almost every year hit Jakarta. The largest floods that occurred in the last decade occurred in 2007. This flood inundated more than 40% of Jakarta City, 80 people died and 340,000 were displaced [3]. Various efforts have been made by the government in flood prevention, both structurally and non-structur- ally. Structurally flood control systems in the Ciliwung River in- clude the creation of a number of flood wire or flood observation posts. In addition, prevention of flood flooding to certain heights with embankments, as well as lowering the flood water level with normalization, sludge, canal flood, and interconnection. The core concept of the canal flood is the control of water flow from up- stream and regulate the volume of water entering Jakarta. In addi- tion, the government is also working to minimize flood discharge with reservoirs, as well as to reduce puddles with polders, pumps and drainage systems. The main problem in controlling rainfall runoff in urban areas gen- erally consists of the need to control peak discharge and flow depth throughout the system, in order to avoid undesired puddles. Peak discharge is a commonly chosen alternative. These additives have the added benefit of allowing for infiltration and evaporation so that in addition to reducing peak discharge also minimizes runoff vol- ume. Temporary in-situ or pool-like containers as well as a sedi- ment container, can also serve as a means of controlling water qual- ity. Many studies and flood control efforts have been undertaken to re- duce the flood loss occurring in Jakarta. Ciawi and Sukamahi Dam is one of the infrastructure designed by the government to reduce the peak flood and increase the peak flood time in Jakarta. Dry Dam Ciawi and Sukamahi are the first dry dams built in Indonesia. Dry dams can be used to temporarily withstand excess water during floods and freely deliver during normal conditions [4]. The purpose of this study is to calculate the effectiveness of the construction of Ciawi and Sukamahi reservoirs as one of the infrastructures that will function as one of the means to reduce the flood peak in Jakarta. 2. Study area description Astronomically, the Ciliwung River is located at 6ᴼ05'-6ᴼ50 'LS and 106ᴼ40'-107ᴼ00' BT. The Ciliwung River Basin area is limited by