Figure 5 – Contemporary and Siwalik channel geometries (data) .xlsx (excel file) Figure 6 - Gravel transport travel times and river discharge calculations (data and calculations) .xlsx (excel file) Supplementary Figure 2 – Conglomerate C1 and C2 grain size distributions (data) .xlsx (excel file) Supplementary Figure 4 - Variation in depth-averaged concentration (c) with bulk flow velocity (u) (data) .xlsx (excel file)