#TITLE_ALTERNATIVE#

• Main Author: SETYA PUTRA (NIM : 95015307), INDRA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28047
• Institution: Institut Teknologi Bandung

Wonogiri dams which is built in 1980 has been shrinked due to sedimentation. Between 6 catchment areas in the upstream of reservoir, Keduang catchment area is the biggest sediment contributor to reservoir. Therefore Balai Besar Wilayah Sungai Bengawan Solo contructs closure dike to intercept and flow sediment form Keduang river in order that it will not enter the main reservoir. With closure dike construction, reservoir will be separated into 2 which consists of sediment storage reservoir and main reservoir. This research aim to examine the impacts of closure dike, overflow dike and new spillway to operation pattern to fulfill raw water demand and energy optimally. Methods for dam’s operation optimation in wet, normal and dry year contain of 4 which are maximize annual firm yield, maximize annual firm energy, minimize total square water shortage, minimize total square energy shortage. Optimation dan simulation did with and without new spillway operation which then the result compared to no new spillway condition. The result is that reservoir can fulfill water demand in wet and normal year unless in dry year. The most suitable upper normal limit curve is by maximize annual firm energy, meanwhile in normal year is by minimize total square energy shortage and in the dry year is by maximize annual firm yield. The duration of deficit of water increases in the dry year from 3 months to 4 months if spillway is being operated. Simulation and optimation yield after closure dike contruction is better in fulfilling water demand than before closure dike contruction. The production of electricity in without new spillway operation condition is bigger than with new spillway operation.