A cargo ship finishes its transit through the Panama Canal on the Pacific side, seen from A Panama City, Monday, Jan. 13, 2020. The Panama Canal Authority announced it will start charging customers for their use of fresh water during their transit thought the canal.

PANAMA CITY (AP) — The Panama Canal will begin collecting a freshwater surcharge from ships transiting the interoceanic waterway, authorities announced Monday, as part of actions to address a scarcity of rainfall after the surrounding watershed recorded its fifth driest year of the last seven decades in 2019.

Canal administrator Ricaurte Vásquez said the new measure aims to protect the supply of freshwater for shipping activity and human consumption.

“It is not an easy decision,” Vásquez said. He added that it will “guarantee the availability of water and the reliability of the (canal) route.”

The new fee will take effect Feb. 15 and has no expiration date. It applies to all vessels over 125 feet in length and consists of a fixed charge of $10,000 per passage plus another variable charge that will depend on water levels at Lake Gatun at the time of the crossing.

“The level of the surcharge drops when the level of the lake is at full capacity,” Vásquez said.

The Canal Authority presented its annual report last week highlighting that 2019 was one of the watershed’s lowest rain years in many decades, about 20% below the historic average.

The watershed, a system of rivers and brooks that feed lakes, is key to canal operations and also supplies freshwater to Panama City, home to about half the country’s population of 4 million.

Vásquez has warned that climate change is a threat to the canal’s operations.

Authorities have not yet determined whether drafting restrictions on vessels, which were implemented in 2019 due to low levels at Lake Gatun, will be necessary this year.

The surcharge could lead to a reduction in traffic through the 105-year-old waterway.

Each passage entails the usage of millions of gallons of freshwater, much of which is released into the ocean.

Clients pay an average of $188,000 per transit, though some crossing fees rise as high as $1 million, according to authorities.

Vásquez said there will also be changes to the system of client reservations to expedite crossings during dry periods.

“Panama needs greater certainty about the quantity and type of ships that are going to cross,” the Canal Authority said in a statement.