A previous study (Ireland and Jameson, J. Colloid Interface Sci. 1 314, 207-213 (2007)) demonstrated that a "drift-flux" model could describe liquid transport in a stable rising froth with added "wash water." In the present study, a drift-flux model was used to describe a rising coalescing froth. This model incorporated the effect of liquid released into the froth by coalescence. Vertical profiles of liquid fraction and bubble size were obtained in a laboratory cell; a novel technique was used for measuring bubbles deep within the cell. These data were consistent with the predictions of the drift-flux model.