Page - 471 - in Book of Full Papers - Symposium Hydro Engineering

4. ADAPTATION OF OPERATION PATTERN OF CITARUM CASCADE RESERVOIR 4.1 Operation of Citarum Cascade Reservoir. The Citarum cascade reservoir has a net capacity of 2.0 x 109 m3, where the net catch is determined from the elevation of the spillway and the minimum elevation of the reservoir (at the Jatiluhur reservoir minimum hydro operation). With annual flow of Citarum in Jatiluhur at ± 5.75 x 109 m3 equivalent to 49% of net capacity, it indicates that this Citarum cascade reservoir is not designed to provide reserve reserves under long drought conditions. The technical data on the Citarum cascade reservoir is presented in as “Table 1”. Table. 1 Technical Data of Citarum Cascade Reservoir Name of Dam Saguling Cirata Ir. H. Djuanda Operational 1985 1988 1967 Specific Reservoirs Data Full supply level 643 m 220 m 107 m Dead storage level 623 m 205 m 56 m*) Minimum power level - - 75 m Maximum storage 880 x 106 m3 1,973 x 106 m3 2,970 x 106 m3 Minimum storage 271 x 106 m3 1,177 x 106 m3 599 x 106 m3 **) Surface area at max operating level 49 km2 62 km2 83 km2***) Hydropower Plant Data Tail level (m) 252 103 27.0 Head loss (m) 28.4 4.0 1.0 Spillway characteristics Gated spillway Gated spillway Ungated (ogee) spillway Installed capacity (max. power, MW) 750 1008 187.5 Number of turbines 4 units 8 units 6 units Type of turbines Francis Francis Francis Dam Data Type Rockfill dam with clay core Rockfill dam with concrete face Rockfill dam with inclined clay core Height 99 m 125 m 105 Crest length 301 m 453.5 m 1220 m Crest elevation 650.20 m 225.0 m 114.5 m Note: *) Based on the existing layout of guiding canal in front of hollow jet gates. **) at El. 49 msl **) at El. 107 msl. The annual operation of this Citarum cascade is made by estimating the water requirement, the statistical data of inflows to the three reservoirs with the total energy generated by the system optimized with priority based on the fulfillment of water requirements downstream of the Ir. H. Djuanda Dam. Water needs downstream of the Ir. H. Djuanda reservoir is 471