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The DIROM (Daily Irrigation Reservoir Operation Model) was modified to estimate amounts of water release from reservoirs, considering customary irrigation water management practices, such as water supply fo r puddling and transplanting paddy rice from seeding beds and mid -season drainage. The applicability of the modified model was investigated by simulating amounts of water release from three study reservoirs: Hwamae, Ogi, and Doya Reservoirs. In terms of annual amounts of water release, the relative errors between the observed and simulated values in 2012 and 2013 ranged -26.20 %to 10.28 % and 4.90 % to 30.06 %, respectively; in case of reservoir water levels, the RMSE values ranged 0.45 m to 1.34 m and 0.40 m to 1.27 m, respectively. Also, it was revealed that the model provided better simulation results for monthly water releases than the original model. In addition, the model presented better performance in simulating 10-day amounts of water release from April to June. However, the model had sti ll significant errors i nthe simulation results from July to Septembe r because the reservoirs were practically op erated to adapt to water management cir cumstances. Finally, it isconcluded that the modified DIROM can estimate the amounts of water release from reservoirs, reflecting irrigation water management customs in paddy-field districts. To achieve higher pr ediction accuracy of the model, it is neces sary to incorporate practical reservoir op eration rules into the model.Keywords: modified DIROM; irrigation water management customs; water release; irrigation reservoir; water demand*

Estimation of Amounts of Water Release from Reservoirs Considering Customary Irrigation Water Management Practices in Paddy-Field Districts