Bed elevation and bed surface grain size field campaigns for the Bovenrijn and Waal rivers are carried out by Rijkswaterstaat. 

The Excel file BedElevation-D50-data-BovenrijnWaal contains 3 tabs:

1. Bed elevation 1926-1999 (m+NAP): single-beam data, covering river km 858-952 (main channel only), with data points every 1 km. Data are cross-section averaged.
2. Bed elevation 1999-2018 (m+NAP): multibeam data, covering river km 857.5-953.9 (main channel only), with data points every 100 m. Data are cross-section averaged.
3. D50 1966-2020 (mm): bed surface grain size (characteristic diameter D50), covering river km 849-952, with data points every 500 m.