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Abstract. In South Korea, irrigation systems including approximately 70,000 irrigation facilities such as reservoirs, pumping and draining stations, weirs, and tube wells, have been built and maintained to enable the efficient management of agricultural water since 1960s. In the case of irrigation infrastructure, however, approximately 56%, are over 40 years old and have deteriorated considerably. Irrigation facilities and canal networks face problems during operation such as collapses and leaks, and lack of facilities managers. Therefore, there is essential to reassess the water supply capacity of canal networks and to accurately identify irrigation water shortage areas and dynamic water distributions in irrigated areas. The South Korean government (Ministry of Agriculture, Food and Rural Affairs (MAFRA) and Korea Rural Community Corporation (KRC)) developed the real-time water level observation system (interval 10 minute) of agricultural reservoirs and irrigation canals to efficiently operate water networks since 1991. Moreover, it is desirable that scientific and data-driven approach using these data of irrigation water management for optimally allocate irrigation water should be made to enhance agricultural water use efficiency and reduce water resources waste. This study presents a hydraulic-hydrological modeling for reservoir-to-irrigated areas developed for steady and unsteady flow simulation in irrigation canal networks based on the EPA-SWMM (Storm Water Management Model) with modulated control method. The coupled hydraulic-hydrological performance analysis in water distribution networks offer opportunities for optimization of irrigation system, such as irrigation efficiency and allocation, by applying flow conditions in complex irrigation canal networks under a variety of management scenarios.