Abstract: A Lattice Boltzmann model for onedimensional unsteady open channel flows is established, by analyzing the multi-scale equations of theLB method and the one-dimensional shallow waterequations. One-dimensional dam break, a classical and practical problem, is simulated by the LBscheme. The good agreement of LB results withthe results of implicit Preissmann scheme and theanalytical solution shows that the LB method isa feasible and accurate approach to simulate onedimensional unsteady open channel flows in engi...