“…It is, therefore, uncertain whether it is the optimal rule curve if the reservoir system is more complex [26,27]. Later, optimization methods were applied and developed to find rule curves, e.g., using simulation, dynamic programming [28,29], genetic algorithms [30][31][32][33], genetic programming [34], Tabu search [35,36], Harris hawks optimization [37], wind driven optimization [38], firefly algorithm [39], flower pollination algorithm [40,41], grey wolf optimizer [42], and fast orthogonal search (FOS) [43]. Optimization techniques have been developed and applied in a wide variety of applications in solving numerical and engineering problems.…”