Asian Journal of Scientific Research1992-14542077-2076Asian Network for Scientific Information10.3923/ajsr.2019.431.439KangrangAnongritSrikamolNutthapongHormwichianRattanaPrasanchumHarisSriwanphengOunla32019123Background and Objective: Rule curves of reservoirs are necessary guides to operate reservoir system in the long run for both flood and draught control. The main objective of each rule curve depended on the characteristics of each reservoir. This paper proposed an alternative approach of a Firefly Algorithm (FA) to connect with the simulation model for searching optimal reservoir rule curves as the flood control area. Materials and Methods: Minimum average excess water and minimum frequency excess water were used as the objective functions for the searching procedure. The historic inflow, synthetic inflow data of 1,000 events and future inflow were used to evaluate efficiency of the flood control rule curves in showing situations of water shortage and excess water in term of frequency, magnitude and duration. The proposed model was applied to determine the optimal flood rule curves of the Nam Oon reservoir in the northeast region of Thailand. Results: The results showed that the patterns of the obtained rule curves were similar to the current rule curves. The optimal flood control rule curves were used to simulate the Nam Oon reservoir system for evaluating the situation of flood in long term operation. The results indicated that situations of water shortage and of excess water using optimal flood control rule curves from the proposed model were smaller than with current rule curves both for the present and future situations. Conclusion: The new obtained rule curves from the proposed FA model are better than the existing rule curves in decreasing flood situation.]]>Chen, Y., N.D.J. Gupta and J. Zhang,2013Huong, T.T.L., N.T. Le, D.A. Duc and N.X. Long,2017Hashemi, M.S., G.A. Barani and H. Ebrahimi,2008Adeyemo, J.A. and F.A.O. Otieno,2009Adeyemo, J.A.,2011Jain, S.K., M.K. Goel and P.K. Agarwal,1998Chaleeraktrakoon, C. and A. Kangrang,2007Ji, C., Z. Jiang, P. Sun, Y. Zhang and L. Wang,2014Chang, J.F., L. Chen and C.L. Chang,2005Hormwichian, R., A. Kangrang and A. Lamom,2009Suribabu, C.R.,2006Afshar, M.H.,2013Kangrang, A., W. Pakoktom, W. Nuannukul and C. Chaleeraktrakoon,2016Kangrang, A. and C. Lokham,2013Afshar, A., F. Massoumi, A. Afshar and M.A. Marino,2015Ming, B., J.X. Chang, Q. Huang, Y.M. Wang and S.Z. Huang,2015Yang, X.S.,2009Yang, X.S.,2010Raja, S.B., N.S. Narayanan, C.V.S. Pramod, A. Ragunathan, S.R. Vinesh and K.V. Krishna,2012Udaiyakumar, K.C. and M. Chandrasekaran,2014Yu, J., S. Yin and H. Li,2017Qin, Z., Z. Li, X. Zhou, B. Wen and C. Zhang,2017Yelghi, A. and C. Kose,2018IPCC.,2013Supakosol, J. and A. Kangrang,2017