Supplementary Material

Table S1. Migratory fish species included in the passability assessment of the LTD shore channels inflows.Table S2. Final swimming velocity threshold test for different significance levels done for all of the yearly datasets for Anguilla anguilla.Figure S1. The 3D lattices of the gridded flow velocities (m/s; 2 significant figures) for the Dreumel shore channel inflow from ADCP data collected in (a) December 2017, (b) February 2018, and (c) March 2019. The gridded flow velocities for the Ophemert shore channel inflow from ADCP data collected in (d) December 2017, (e) February 2018, and (f) March 2019. The x, y and z orientations are indicated by the arrows on the bottom-left corners. Figure S2. Hydrograph for the river Rhine at the Lobith RWS monitoring station from 2015-2021 (www.waterinfo.rws.nl). Superimposed are the migration periods for the five fish species with migrations outside of the ADCP data collection dates. The dashed grey lines denote the minimum and maximum river discharges during which ADCP data was collected. The graph shows that high river discharges (= 3489 m3 /s) have also occurred during those periods since the construction of the LTDs.

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© N.Y. Flores et al., Published by EDP Sciences 2022