Controlled Ebro River Flood Moves Up to 15,000 Tons of Sediment

Authorities analyze a 24-hour water release from Riba-roja dam to support the Ebro Delta's ecosystem.

Generic image of water being released from a dam for sediment management.
IA

Generic image of water being released from a dam for sediment management.

The Ebro Hydrographic Confederation (CHE) estimates that a 24-hour controlled flood from the Riba-roja d'Ebre reservoir moved between 10,000 and 15,000 tons of sediment downstream this March.

For the first time, the operation lasted a full day, maintaining high turbidity levels throughout. Miguel Ángel García Vera, head of hydrological planning, noted that the results are promising for the Ebro Delta, despite previous natural floods in February having already cleared part of the riverbed.

"The lowering of the level may have conditioned a greater mobility of sediments than on previous occasions."

Miguel Ángel García Vera · Head of Hydrological Planning at CHE
Researchers from several universities, including Lleida and UPC, used specialized equipment to sample coarse sediments like gravel and sand. These materials are essential for preventing the Delta's disappearance, as finer sediments are often washed away by the sea.
This initiative is part of the GISDE Strategy for sediment management. The data collected will help shape the 2027 Ebro Hydrological Plan, which aims to restore the river's natural dynamics through larger, more frequent controlled floods.