Performance evaluation of hydro power reservoir

The rule curves developed for a specific reservoir are used to evaluate the performance of the reservoir within a year and compare to the forecast performance by using inflow and benefit summation curves. The range of annual benefit from lower values in dry years and higher values in wet years is obtained under certain risk conditions. The 32-year period of reservoir routing indicates that the boundaries of annual benefit may be higher or lower expressed as positive or negative quantities added to the annual benefit. It is proven that the realised reservoir level variation followed the forecast one from August to November, and from April to July. Due to several reasons the reservoir was lowered from December to March, indicating an extremely intense lowering. Higher rates of power production are also present at the end of September - beginning of October, the first fortnight: of December and in middle Match. In the months of middle October to end of November due to testing of the turbines and in April due to the plant maintenance no power was produced. Although the variation of the power factor is not considerably great, it is easily understood that operation of the reservoir at lower levels than those suggested by the lower boundary of the rule curves, results in energy loss which may be in considerable amounts.