April 20, 2025 | 20:28 GMT +7

  • Click to copy
Saturday- 11:19, 17/06/2023

Global water reservoir volumes decline despite construction boom

(VAN) Global reservoir volumes fell during the last 20 years despite a construction boom that drove up storage capacity, a new study showed...,

Global reservoir volumes fell during the last 20 years despite a construction boom that drove up storage capacity, a new study showed on Tuesday (Jun 13), suggesting that new dams will not be enough to solve growing strain on the world's water supplies.

Satellite data showed that water sequestered in 7,245 reservoirs across the world fell from 1999 to 2018, despite a 28 cubic kilometre annual increase in capacity, a study published by Nature Communications said.

Climate change was a "critical factor" in reducing reservoir efficiency, said lead author Huilin Gao of Texas A&M University, but rising water demand also played a role.

"Even if temperatures stop rising, increasing demand and new construction are likely to continue," he added.

The decline in storage volumes was concentrated in the south, especially Africa and South America, where water demand increased rapidly and new reservoirs didn't fill up as quickly as expected.

The study did not account for the impact of sedimentation, a persistent problem that is predicted to cut storage capacity by a quarter by 2050, according to a January paper by the United Nations University.

Lengthy droughts have raised questions about the feasibility of large reservoirs. China saw hydropower output plummet last summer as a result of record-high temperatures across the Yangtze basin.

The International Hydropower Association said last week that new dams and reservoirs played a "crucial mitigating role in an era of increasing climate extremes", making it easier to regulate water flows.

"As the climate gets more volatile, we will need more, not less, water infrastructure, with the bonus of much-needed low-carbon electricity," it said.

China has also repeatedly said its enhanced ability to store and release water on the upper reaches of the Yangtze has alleviated downstream floods and droughts.

Unlike many regions, China's storage levels increased slightly over 1999-2018 as a result of higher run-off in major river basins, suggesting it will benefit from new reservoirs, Gao said.

"But this highly depends on future climate, especially since most regions have experienced decreasing run-off," he said.

HD

(Reuters)

California agriculture reels from Trump's new tariff policy

California agriculture reels from Trump's new tariff policy

(VAN) California's $59 billion agriculture industry faces serious disruption as the U.S. clashes with China - one of the state's major export markets.

Two years since the start of the conflict, Sudan is facing a severe food security catastrophe

Two years since the start of the conflict, Sudan is facing a severe food security catastrophe

(VAN) Five things you should know about Sudan's food security crisis.

U.S. spacecraft brings Vietnamese lotus seeds into space

U.S. spacecraft brings Vietnamese lotus seeds into space

(VAN) 169 lotus seeds selected by the Vietnam Academy of Agricultural Sciences were carried into space by Vietnamese-American astronaut Amanda Nguyen.

China put steep tariffs on U.S. exports. Farmers are worried

China put steep tariffs on U.S. exports. Farmers are worried

(VAN) Tariffs are making life more expensive for John Pihl. He's been farming in Northern Illinois for more than 50 years.

New US tariffs spark alarm among EU and US farming groups

New US tariffs spark alarm among EU and US farming groups

(VAN) European and American farmer organisations are concerned about the import tariffs that the United States introduced on 9 April for products from the European Union. This makes them 20% more expensive.

Strong poultry markets with geopolitical risks

Strong poultry markets with geopolitical risks

(VAN) Global poultry trade is expected to remain strong amid relatively tight global protein supply and growing consumption, RaboResearch concludes in its latest animal protein report.

Big, biodiverse and beautiful: can Romania’s centuries-old giant haystacks survive modern farming?

Big, biodiverse and beautiful: can Romania’s centuries-old giant haystacks survive modern farming?

(VAN) Traditional methods benefit hundreds of species but as new agricultural techniques take over, the distinctive haystacks mark a vanishing way of life.

Read more