Abstract: Abstract: A method for the estimation of gas liquid velocities at the flood point in a packed column, based on the models of flooding investigations in a narrow channel, was introduced herein. Experiments were conducted by using two structured corrugated packings and a novel vertical sheet packing. Experimental results show that the Wallis type model can effectively describe the flooding characteristics of the two corrugated packings, and the average relative deviation between experimental results and the calculated data by the model is -10.06%, while the Drosos type model can accurately predict the gas liquid velocities at the flooding point in a packed column with an average relative deviation of -4.09%. In addition, in order to identify the onset of flooding as well as flooding spread process in a packed column, numerical experiments using volume of fluid method was employed. The results show that the onset of flooding is mainly triggered by the film wavy behavior.