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The aim of this study was to investigate the effect of downstream transition slopes of a flow measurement flume on the submergence ratio corresponding to the modular limit of the structure, for two groups of model type. The modular limit has been related to Froude number, and approach head to throat length ratio, for practical purposes. Modular limit values as high as 95% were obtained. It was found that in both groups of model type, for a given value of Froude number, the modular limit increases and attains its maximum value as the downstream transition slope of the model decreases. It was also found that as the downstream transition slope increases for a given value of, the values of decrease for both groups of models. General equations relating the modular limit with and have been derived and can be used to find the modular limit of different structures with the same geometry and downstream transition slopes.