Decision support system for reservoir operation considering rotational supply over irrigation blocks

This study aims not only to evaluate agricultural drought in paddy using the storage ratio of the corresponding reservoir, but also to develop a rotational irrigation scheduling system (RISS) for supporting both water supply scheduling and on–off control works for automated irrigation. From the present storage ratio of reservoir and an operation rule curve (ORC) as a guideline for releasing irrigation water, reservoir operators could determine the appropriate time to restrict the irrigation water supply, and calculate the deficient amount of irrigation water. The RISS based on the ORC and weekly rainfall forecasting information has been developed for decision support to minimize drought damage in irrigation districts during the irrigation period. The system was also applied to a test irrigation district with the Yedang irrigation reservoir, which is located in the mid-west of Korea. The RISS could be utilized as a water management program for irrigation reservoirs by interfacing with telemetering and telecontrol (TM/TC) technology.