The datasets contain maps of the total change in topography along the river Liang (Philippines) after the Typhoon Mangkhut event in September 2018. The maps have been generated using multi-phase mass model r.avaflow to simulate the change in channel and landscape. Full details about this dataset can be found at https://doi.org/10.5285/5d17ff4b-fc98-47e5-9d61-956b17254681