Shallow water along the Danube’s entire 2,412-kilometer navigable stretch is forcing larger vessels to maintain at least 10 centimeters of clearance between their hulls and the riverbed.
Authorities are regularly surveying the river and issuing notices about shallow sections where the depth falls below the usual 270 centimeters. Captains must decide whether to proceed based on their vessels’ draft.
With no significant rainfall forecast in the Danube or Tisza river basins, a new heat wave is worsening conditions, leaving water levels stagnant or gradually declining.
The Danube in Budapest reached a record low of 31 centimeters Tuesday morning, breaking the previous record of 33 centimeters set in 2018. The level fell further to 28 centimeters by 5 p.m.
Some cargo vessels can continue operating only with sharply reduced loads, carrying 10%-20% of their normal capacity, while others remain docked.



