Kajian Sistim Pengendalian Banjir Wilayah Tengah DKI-Jakarta Terhadap Beban Hidrograf Banjir Akibat Hujan Merata

. The flood control system of middle Jakarta consists of open channels system, gates, pumping station and small reservoir. This paper presents mathematical model study on the hydraulic behavior of the above flood control system due to the design flood of Q100 and to the highest expected flood discharges (Q1000) as it was recorded in 2002. The hydraulic behavior is defined as a combination of control structure operation for maximizing the system capacity in responding the flood. The flood discharge is defined as a flood hydrograph generated in each inlet sub-system by a well distributed (homogeneous) rain fall. Lay out and canal dimension of the existing flood control was determined by field investigation and available secondary data. Based on this study, it is found that the flood control capacity is smaller than Q100 and capable only for the flood discharge of the local drainage system. The inundation has already started when the flood discharge due the Q25 is achieved and significantly increased when the upstream flood discharge is entered to the channel system