Millions of gallons of Colorado River water hurtle through the Hoover Dam every day, generating electricity for hundreds of thousands of homes.

But the mega drought affecting the western United States is sending reservoir levels plummeting towards deadpool -- the point at which the dam can no longer produce power.

"We are 23rd year of drought here in the Colorado River Basin and Lake Mead has dropped down to 28 percent," explains Patti Aaron of the US Bureau of Reclamation, which operates the dam. She was referring to the vast lake created by the building of the dam.

"There isn't as much head so there isn't as much pressure pushing the water into the turbines, so there's less efficiency and we aren't able to produce as much power."

Hoover Dam was a feat of American hope and engineering.

Construction began in 1931 as the country was withering under the Great Depression.

Thousands of workers toiled 24 hours a day to build what was then the largest hydroelectricity facility in the world.

The dam stopped up the Colorado River, creating Lake Mead, the biggest reservoir in the United States.

At its height, the lake surface sits over 1,200 feet (365 meters) above sea level. But after more than two decades of drought it is now less than 1,050 feet -- the lowest since the lake was filled, and falling about a foot a week.

If it drops to 950 feet, the intakes for the dam will no longer be under water and the turbines will stop.

"We're working very hard for that not to happen," said Aaron. "It's just not an option to not produce power or not deliver water."

- Melting snowpack -

The Colorado River rises in the Rocky Mountains and snakes its way through Colorado, Utah, Arizona, Nevada, California and northern Mexico, where it empties into the Gulf of California.

It is fed chiefly by the huge snowpack that gets dumped at high altitudes, melting slowly throughout the warmer months.

But reduced precipitation and the higher temperatures caused by humanity's unchecked burning of fossil fuels means less snow is falling, and what snow there is, is melting faster.

As a consequence, there is not as much in a river that supplies water to tens of millions of people and countless acres of farmland.

Boaters on Lake Mead, many of whom come from Las Vegas and its surrounding towns, say they are doing their part to protect supplies.

They point to the drought-tolerant landscapes they have installed instead of lawns, and the high percentage of indoor water that is recycled in desert towns.

"But you've got farmers in California growing almonds for export," said Kameron Wells, who lives in nearby Henderson, Nevada.

Householders in southern California have grumbled about the fate of their luscious lawns since being ordered to limit their outdoor watering to one or two days a week at the start of the summer.

But there, like in the desert periphery of Las Vegas, there is plenty of new construction, with huge houses being put up in the resort settlement of Lake Las Vegas.

And from the air, the vibrant green of dozens of golf courses mark an otherwise dust bowl landscape.

- 'Out of sight, out of mind' -

Climatologist Steph McAfee of the University of Nevada, Reno, says the US west has always been something of an improbability.

"The average precipitation in Las Vegas is something like four inches (10 centimeters) a year," she told AFP.

"And to make it possible to have cities like Las Vegas and Phoenix and Los Angeles we rely on water that falls in the mountains as snow in parts of the West that are obviously much, much wetter."

The last two decades of drought are not, McAfee says, actually that unusual in climatic terms, according to tree ring reconstructions.

But "what's going on now is that we're having a drought, and temperatures are much warmer and when temperatures are high, things dry out faster.

"That is a consequence of climate change... driven by human greenhouse gas emissions."

On Lake Mead, boat seller Jason Davis manoeuvers his craft towards Hoover Dam, where thousands of tonnes of concrete loom over the water in graceful modernist lines, and a ring of mineral deposits shows where the water level used to be.

For him, the lake is not just a battery for the huge generators in the dam, but a waterscape whose beauty and peacefulness are worth protecting.

"You know, people who haven't been here don't appreciate it," he says as a sunset rages in the desert sky above.

"It's like, out of sight, out of mind. Hey, we're using too much water.

"Well, if you if you haven't seen these rings, you don't quite comprehend.

"Hopefully it's not too late."

Italy declares drought emergency in 5 northern regions
Rome (AFP) July 4, 2022 - Italy declared a state of emergency in five northern regions and announced emergency funds on Monday over a worsening drought that has plagued the Po Valley in recent weeks.

The cabinet approved a state of emergency in five regions -- Friuli-Romagna, Friuli-Venezia Giulia, Lombardy, Piedmont and Veneto -- until December 31, the government said in a statement that also announced a 36.5 million-euro ($39.5 million) fund to help those affected.

Italy is facing an unusually early heatwave and a lack of rainfall, particularly in the northern agricultural Po Valley, which has been hit by its worst drought in 70 years.

The state of emergency provides "extraordinary means and powers" to help guarantee public safety, compensation for losses while seeking to guarantee normal living conditions for those in the area.

According to the country's largest agricultural union, Coldiretti, the drought threatens more than 30 percent of national agricultural production, and half of the farms in the Po Valley, where Parma ham is produced.

Lakes Maggiore and Garda were also hit by lower than normal water levels for this time of year, while further south the Tiber River, which runs through Rome, also dropped.

The Po represents the peninsula's largest water reservoir, much of which is used by farmers.

In recent days, several municipalities have announced restrictions.

Verona, a city of a quarter of a million people, has rationed the use of drinking water, while Milan has announced the closure of its decorative fountains.

Another consequence of the drought is that hydroelectric power production has fallen sharply.

Hydroelectric plants, mostly in the mountainous north of the country, account for nearly 20 percent of national energy production.

The announcement comes a day after at least seven people died after a glacier collapsed in the Italian Alps which Prime Minister Mario Draghi said was "without doubt" linked to global warming.

Related Links
Water News - Science, Technology and Politics

Tweet

Thanks for being here; We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor $5 Billed Once credit card or paypal		SpaceDaily Monthly Supporter $5 Billed Monthly paypal only

Drought hits Italy's hydroelectric plants
Rome (AFP) June 24, 2022
Hydroelectric power in Italy has plunged this year thanks to a drought that has also sparked water restrictions and fears for agriculture, industry sources said Friday. Hydropower facilities, mostly located in the mountains in the country's north, provide almost one fifth of Italy's energy demands. But the lack of rain is causing problems, at a time when Rome is desperately trying to wean itself off its dependence on Russian gas due to the war in Ukraine. "From January to May 2022, hydro pro ... read more