MANAGEMENT AND DEVELOPMENT OF CASCADE RESERVOIR IN THE UPSTREAM OF KOMERING WATERSHED IN ORDER TO RESTRAIN ITS DESTRUCTIVE FORCE AND TO MEET RAW WATER DEMAND IN THE DOWNSTREAM AREA - EQUATORIAL RAINFALL ZONE

• Main Author: Permatasari, Rosmalinda
• Format: Dissertations
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/44446
• Institution: Institut Teknologi Bandung

Climate and land cover change lead to hydrological regime alteration, threatening the water resources sustainability, therefore the water supply infrastructure adaptation or adjustment efforts and mitigation were performed. The effort to meet the growing water demand from limited water resources availability required an integrated planning of river area in order to determine the appropriate step and action to optimize the potential natural resources (water resources) and to protect / conserve and also to improve natural resources. Research was conducted in the Upper Komering watershed region particularly Ranau Lake - Perjaya Headwork in the equatorial rainfall area. Carrying capacity of unmanaged water resources led to water damage (drought and flood). Water damage had occurred in the Komering watershed, where the extremities in the upper watersheds discharge resulted in the damage of river walls (river runoff diversion). This dissertation aims to develop a conceptual model of management optimization of upstream of Komering watershed reservoir cascade in the equatorial rainfall area in order to restrain the Komering watershed destructive force and to ensure the water resources sustainability. The data used in the study were mostly secondary obtained from River Project Department VIII, Meteorology Climatology and Geophysics Department, The Musi River Bureau and other data to support the data processing particularly the main component of hydrological rainfall and discharge. The study was conducted in four stages. The first stage was collecting data in the studies of hydrological regime characterization in the upstream of Komering watershed. The second stage was analyzing the existence of reservoir development in the upstream of Komering watershed to control its destructive power and to increase the water resources availability. The analysis of reservoir operational pattern was carried out by using deterministic to determine the reservoir trajectory guidance and optimization by using The Discrete Markov model of discharge forecast. The third stage was the reservoir optimization by applying the continuous models of discharge forecast. The fourth stage was to analyze the flood, before and after the development of the reservoir. The results showed that an optimization model was achieved if the actual trajectory guideline of the reservoir (dry, normal and wet) was approaching the built track guidelines (PP 37 in 2010). The optimization from continuous models was better than discrete stochastic models. Calibration results of historical discharge and Markov prediction model for Ranau Lake and Tiga Dihaji reservoir were 0.7019 and 0.6470, respectively while the correlation values between their reservoir trajectory guidelines and their actual ones were 0.8743 and 0.8352, respectively. The continuous model gave correlation values between trajectory guidelines and their actual ones for Ranau Lake and Tiga Dihaji reservoir of 0.9110 and 0.8987, respectively. Flood historical tracking in the upstream of Komering watershed based on the peak runoff analysis occurring in the Perjaya Headwork before the reservoir development was 4,500 m3/sec and after was 3,500 m3/sec.