Bathymetric data of floodplains is essential to establish river discharge from either in-situ or satellite remote sensing. TEMBO Africa Floodplain Mapping & Bathymetry service produces seamless bathymetry/topography maps of floodplains, converting existing remote sensing data on surface area and river width into wetted profiles and reservoir volumes. This is done on a regular basis to keep the bathymetry for discharge estimates and hydraulic simulations up-to-date. The service is based on the use of UAVs and fish-finders, while the depth range is up to 100 meters.