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There has been carried out a study of the throughput capacity of a triangular spillway for venting excess air in a sewerage system operating with an «air cushion». A laboratory experiment was performed to estimate the height of the air flow depending on the air flow rate and the angle of the triangular spillway. Patterns have been obtained reflecting an increase in the flow capacity of the spillway as the height of the air flow and the angle at the top of the spillway increase. The results correlated qualitatively with the previously obtained model calculations. Using the Bernoulli equation and experimental data, the value of the compression coefficient ε of the air flow penetrating into the aqueous medium was clarified. For flow rates from 0,01 to 1,4 l/s, the coefficient value varied in the range from 0,04 to 0,193.