Seawater threatens farms relying on Italy's Po as flow falls in heatwave

The flow of Italy’s Po River has dropped dramatically in less than two weeks as a result of the heatwave ​gripping Europe, allowing salty seawater to advance as far ‌as 18 km (11 miles) inland and raising fears for the delta’s agriculture and protected wetlands.

At the last point before the Po river branches into several channels feeding ​into the Adriatic Sea, the flow has dropped from some ​1,000 cubic metres per second to below 300.

While engineers have ⁠been tackling the so-called salt wedge for years, barriers built ​in the 1980s to limit the intrusion of seawater are proving insufficient.

“We ​are seeing an increase in the frequency and intensity of extreme events, which we are also observing here,” said Rodolfo Laurenti, director of the Po river Delta ​Reclamation Consortium, which manages and safeguards water resources.

While the river appears ​to be normal, saltwater has been infiltrating it, drying out the environment and damaging ‌crops ⁠at a crucial juncture in their growing cycle.

“Without this primary resource, we don’t know whether these crops will complete their cycle and whether we’ll be able to harvest them,” said local farmer Federica Vidali, ​whose soybeans, alfalfa ​and sunflowers need ⁠large amounts of water.

Irrigation canals are being shut to prevent saltwater from burning crops, a measure also ​affecting maize and rice growers.

A similar crisis hit ​after a ⁠severe drought in 2022, but farmers say this year is more alarming because of how early the phenomenon has appeared.

“The minimum value below which ⁠it ​was thought the river’s flow could never ​fall has, in fact, more than halved at the moment,” Laurenti said.