Extended Data Fig. 2: Cumulative height distribution of artificial barriers found in European rivers.
From: More than one million barriers fragment Europe’s rivers
The figure shows (log10 scale) that most barriers (68% of n = 117,371 built structures equal to or greater than 10 cm in height) are low-head structures (such as fords, culverts and sluice gates) smaller than 2 m in height; these are ubiquitous but typically unreported in existing barrier inventories.
