Abstract
ABSTRACT This study developed an operating rule curve (ORC) for multipurpose water supply (irrigation and environmental water) in height ened agricultural reservoir. Among the 20 reservoirs in improvement pr oject of agricultural reservoir dam heightening, the 4 represe ntative reservoirs (Ungyang, Gungchon, Yongam and Unam) were selected for the study according to the analysis of statistical characteri stics. Available environmental water supply amounts during irrigation and non-irrigation periods, which is the range from release rest ricted water level to high water level were estimated by water balance analysis using reservoir operation model. Reliability, resiliency and vulnerability criteria for water system performance were used to assess the multiple water supply capacity. The ORC was present ed as the percentile rank for the daily reservoir water level from the results of reservoir operation using the past couple of decade s weather data. The water levels for each percentile were divi ded into 3 buffer sections representing drought (5 ～25%), normal (25 ～75%), and flood (75～95%) year to operate the heightened agricultural reservoir with ORC.
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