Authorities say the intervention on the Casais dyke on the Mondego River has provisionally restored watertightness, stopping water passing from the riverbed to adjacent fields and allowing drainage of flooded land, Público and RTP report. The repair is described as temporary and aimed at stabilising the area near Coimbra and the A1 motorway while longer repairs are planned. Residents and drivers near Coimbra should note reduced immediate flood risk but follow municipal updates on road access and land clearance.
Temporary repair completed on Mondego dyke
Sunday, 22 February 2026AI summary
Context & Explainers
The Mondego (Rio Mondego) is the longest river flowing entirely within Portugal, stretching approximately 258 km from the Serra da Estrela mountains to its mouth at Figueira da Foz on the Atlantic coast. It passes through Coimbra, one of Portugal's most important historical cities.
The Mondego basin is significant for agriculture, hydroelectric power, and water supply. However, the lower Mondego floodplain is highly vulnerable to flooding, and major flood events have caused extensive damage to Coimbra and surrounding communities. Flood management along the Mondego — including dam operations, levee maintenance, and urban planning — is a recurring policy issue.
The river's management involves coordination between APA (the Portuguese Environment Agency), local municipalities, and the national government, particularly during heavy rainfall events when dam discharge decisions become critical.
A dyke is a built embankment or wall that holds back water from a river, sea or lake to protect land and property. In flood or irrigation operations, fixing a dyke's watertightness stops water passing into adjacent fields and lets crews pump or drain still-flooded areas to return land to use.