Abstract:
In this study, the main objective is to develop an advanced reservoir operation system for
Geba reservoirs with specific objectives of extended flow, developing water balance and
preparing a rule curve for Geba reservoirs. The models and the technique which applied for
obtaining those objectives was First order Auto-Regressive (AR, 1), Dynamic programming
and HEC-ResSim.3 for simulation and optimization of Geba I and II reservoir operation. In
order to get the initial guide curve the FORTRAN language of Dynamic Programming (DP)
was employed. This initial guide curve was used as starting guide curve during detail
reservoir simulation using monthly reservoir inflow data of 32 years.
The HEC-ResSim model uses the reservoir physical characteristics (Elevation- Capacity-Area
curve), net monthly evaporation from the reservoirs (mm), daily inflow (rrr' /s) operation rule
adjusted i.e. tandem operation for Geba I reservoir finally released operation rule for Geba II
reservoir, the alternative released guide curve of elevation maximum capacity operation level
and maximum elevation relation of dam appurtenant structures such as spillway, penstocks
and tail water elevation. The out put of the AR (1) was indicted that the flow which was extended has similar flow
pattern with that of the historical recorded flow data. At the same time the DP of FORTRAN
language result was represent maximum energy of 135.51GWh during the month July to
December and minimum of 4.06GWh during the month of February to April for Geba I
reservoir, for Geba II reservoir maximum of 97.99GWh during the month of July to
November and minimum of 2.26GWh during the month of February to April. The out put of
Tandem operation rule of HEC- ResSim was based on the reservoir water level and the
released pattern alternatives; the simulation operation was suggested considering relatively
the system minimum losses and maximum power generation of214.5 MW and 157.0MW in
