Tag Archives: Dam

Midwest tornadoes and a dam fails after rain, wind raged through

Storm-Damage-Chicago

Important Takeaways:

  • Hundreds of people in a southern Illinois town were ordered to evacuate Tuesday as water rolled over the top of a dam, just one perilous result of severe weather that raged through Midwest overnight with relentless rain and tornadoes and hit the Chicago area especially hard.
  • Hundreds of thousands of people lost power, and even weather forecasters had to briefly scramble for safety.
  • A woman in Indiana died after a tree fell on a home Monday night.
  • Water overtopped a dam near Nashville, Illinois, sending first responders out to ensure everyone got out safely. There were no reports of injuries in the community of 3,000, southeast of St. Louis, but a woman reported water up to her waist in her home, said Alex Haglund, a spokesperson for the Washington County Emergency Management Agency.

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A breached dam outside Mankato Minnesota is in “imminent failure condition.”

Minnesota-Dam-total-failure

Important Takeaways:

  • Minnesota dam at risk of total failure amid “historic” flooding
  • Threat level: Recent heavy rain, including a foot-and-a-half in southern Minnesota, has already closed roads, caused serious damage, and left some communities under feet of water.
  • The latest: Blue Earth County officials warned Monday that a breached dam outside Mankato is in “imminent failure condition.”
  • Those alarms came as the state deployed 46 National Guard soldiers to Waterville in Le Sueur County in response to what local officials say is the worst flooding in its history.
  • By the numbers: The governor said while the $26.4 million currently in the account is “probably not” enough to cover the damages, the federal aid that would flow from a disaster declaration could help fill the gap.
  • Another $50 million is already set to be transferred to the account in August, per KARE 11.

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Major flooding in Ukraine after Dam destroyed; Some are comparing it to Hoover Dam

Revelations 6:3-4 “when he opened the second seal, I heard the second living creature say, “Come!” 4 And out came another horse, bright red. Its rider was permitted to take peace from the earth, so that people should slay one another, and he was given a great sword.

Important Takeaways:

  • A Massive Ukraine Dam Has Been Destroyed, And Both Sides Are Pointing Fingers.
  • The destruction of a Ukrainian dam approaching the scale of America’s Hoover Dam has unleashed a devastating torrent of water in the country’s south. Ukraine’s President Volodymyr Zelensky blamed Russia for damage to the Kakhovka Hydroelectric Power Plant.
  • Russian officials, however, say the attack on the dam was a “deliberate act of sabotage” by Ukraine, “linked to the fact that, having begun large-scale offensive operations two days ago, the Ukrainian armed forces are not achieving their aims.”
  • The BBC opines that Ukraine’s claims are “plausible” given major flooding in the region could hinder a Ukrainian counter-offensive – but the Ukrainians told The Washington Post in December that they had been considered blowing the dam, and even conducted a successful HIMARS test strike on its floodgates:
    • “The Ukrainians… even conducted a test strike with a HIMARS launcher on one of the floodgates at the Nova Kakhovka dam, making three holes in the metal to see if the Dnieper’s water could be raised enough to stymie Russian crossings but not flood nearby villages.”
    • – Washington Post, December 29 2022
  • Several villages are currently believed to be submerged. The dam held back a volume of water roughly equivalent to the Great Salt Lake in Utah.

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Brazil’s grief turns to anger as death toll from Vale disaster hits 60

Members of a rescue team search for victims after a tailings dam owned by Brazilian mining company Vale SA collapsed, in Brumadinho, Brazil January 28, 2019. REUTERS/Adriano Machado

By Gram Slattery

BRUMADINHO, Brazil (Reuters) – Grief over the hundreds of Brazilians feared killed in last week’s mining disaster has quickly hardened into anger as victims’ families and politicians say iron ore miner Vale SA and regulators have learned nothing from the recent past.

By Monday, firefighters in the state of Minas Gerais had confirmed 60 people dead in Friday’s disaster, in which a tailings dam broke sending a torrent of sludge into the miner’s offices and the town of Brumadinho. Nearly 300 other people are unaccounted for, and officials said it was unlikely that any would be found alive.

A member of a rescue team is sprayed with water to remove mud, upon returning from a rescue mission, after a tailings dam owned by Brazilian mining company Vale SA collapsed, in Brumadinho, Brazil January 28, 2019. REUTERS/Washington Alves

A member of a rescue team is sprayed with water to remove mud, upon returning from a rescue mission, after a tailings dam owned by Brazilian mining company Vale SA collapsed, in Brumadinho, Brazil January 28, 2019. REUTERS/Washington Alves

Shares of Vale, the world’s largest iron ore and nickel producer, plummeted 21.5 percent in Monday trading on the Sao Paulo stock exchange, erasing $16 billion

in market cap.

Brazil’s top prosecutor, Raquel Dodge, said the company should be held strongly responsible and criminally prosecuted. Executives could also be personally held responsible, she said.

Brazil’s Vice President Hamilton Mourao, who is acting president since Monday morning when Jair Bolsonaro underwent surgery, also said the government needs to punish those responsible for the dam disaster.

In a tweet, Brazilian Senator Renan Calheiros asked Justice Minister Sergio Moro “how many people should die before federal police charges Vale management before key evidence disappears.” Moro is a previous judge in charge of Brazil’s largest-ever corruption probe.

Israeli military personnel arrive to help search for victims of a collapsed tailings dam owned by Brazilian mining company Vale SA, at Confins airport in Belo Horizonte, Brazil January 27, 2019. REUTERS/Washington Alves

Israeli military personnel arrive to help search for victims of a collapsed tailings dam owned by Brazilian mining company Vale SA, at Confins airport in Belo Horizonte, Brazil January 27, 2019. REUTERS/Washington Alves

One of Vale’s lawyers, Sergio Bermudes, told newspaper Folha de S. Paulo that the executives should not leave the company and that Calheiros was trying to profit politically from the tragedy.

Vale Chief Executive Fabio Schvartsman said during a visit to Brumadinho on Sunday that facilities there were built to code and equipment had shown the dam was stable two weeks earlier.

The disaster at the Corrego do Feijao mine occurred less than four years after a dam collapsed at a nearby mine run by Samarco Mineracao SA, a joint venture by Vale and BHP Billiton, killing 19 and filling a major river with toxic sludge.

While the 2015 Samarco disaster dumped about five times more mining waste, Friday’s dam break was far deadlier, as the wall of mud hit Vale’s local offices, including a crowded cafeteria, and tore through a populated area downhill.

“The cafeteria was in a risky area,” Renato Simao de Oliveiras, 32, said while searching for his twin brother, a Vale employee, at an emergency response station.

“Just to save money, even if it meant losing the little guy… These businessmen, they only think about themselves.”

As search efforts continued on Monday, firefighters laid down wood planks to cross a sea of sludge that is hundreds of meters wide in places, to reach a bus in search of bodies inside. Villagers discovered the bus as they tried to rescue a nearby cow stuck in the mud.

A rescue helicopter flies after a tailings dam owned by Brazilian mining company Vale SA collapsed, in Brumadinho, Brazil January 27, 2019. REUTERS/Adriano Machado

A rescue helicopter flies after a tailings dam owned by Brazilian mining company Vale SA collapsed, in Brumadinho, Brazil January 27, 2019. REUTERS/Adriano Machado

Longtime resident Ademir Rogerio cried as he surveyed the mud where Vale’s facilities once stood on the edge of town.

“The world is over for us,” he said. “Vale is the top mining company in the world. If this could happen here, imagine what would happen if it were a smaller miner.”

Nestor José de Mury said he lost his nephew and coworkers in the mud.

“I’ve never seen anything like it, it killed everyone,” he said.

SAFETY DEBATE

The board of Vale, which has raised its dividends over the last year, suspended all shareholder payouts and executive bonuses late on Sunday, as the disaster put its corporate strategy under scrutiny.

“I’m not a mining technician. I followed the technicians’ advice and you see what happened. It didn’t work,” Vale CEO Schvartsman said in a TV interview. “We are 100 percent within all the standards, and that didn’t do it.”

Many wondered if the state of Minas Gerais, named for the mining industry that has shaped its landscape for centuries, should have higher standards.

“There are safe ways of mining,” said Joao Vitor Xavier, head of the mining and energy commission in the state assembly. “It’s just that it diminishes profit margins, so they prefer to do things the cheaper way – and put lives at risk.”

Reaction to the disaster could threaten the plans of Brazil’s newly inaugurated president to relax restrictions on the mining industry, including proposals to open up indigenous reservations and large swaths of the Amazon jungle for mining.

Mines and Energy Minister Bento Albuquerque proposed in an interview late on Sunday with newspaper O Estado de S. Paulo that the law should be changed to assign responsibility in cases such as Brumadinho to the people responsible for certifying the safety of mining dams.

“Current law does not prevent disasters like the one we saw on Brumadinho”, he said. “The model for verifying the state of mining dams will have to be reconsidered. The model isn’t good.”

The ministry did not immediately respond to questions about the interview.

German auditor TUV SUD said on Saturday it inspected the dam in September and found all to be in order.

(Reporting by Gram Slattery; Additional reporting by Tatiana Bautzer; Editing by Frances Kerry and Marguerita Choy)

Hundreds missing after Laos dam under construction collapses: media

Villagers evacuate after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 24, 2018. ABC Laos News/Handout via REUTERS

By Amy Sawitta Lefevre

BANGKOK (Reuters) – Hundreds of people are missing and several are feared dead after a hydropower dam under construction in southern Laos collapsed, causing flash flooding that swept away homes, state media reported on Tuesday.

The disaster left more than 6,600 people homeless, the Lao News Agency reported. It showed pictures of villagers wading through muddy floodwater carrying belongings. Others boarded rickety wooden boats or stood on the roofs of partially submerged houses.

Officials have brought boats to help evacuate people in San Sai district of Attapeu province, where the Xepian-Xe Nam Noy hydropower dam is located, as water levels rise after the collapse, ABC Laos news reported.

The South Korean company building the dam said heavy rain and flooding caused the collapse and it was cooperating with the Laos government to help rescue villagers near the dam.

“We are running an emergency team and planning to help evacuate and rescue residents in villages near the dam,” a SK Engineering Construction spokesman told Reuters by telephone.

Another official of SK Engineering Construction said the company ordered the evacuation of 12 villages as soon as it became clear that the dam would collapse.

The South Korean foreign ministry said in a text message to reporters that 50 workers of the company and three from Korea Western Power Co. who were stationed at the construction site had been evacuated.

The dam collapsed at 8:00 p.m. local time (1300 GMT) on Monday, releasing 5 billion cubic meters of water and several hundred people are missing after homes were swept away, the Lao News Agency said. It said several people had died.

A video posted by the ABC Laos news on its Facebook page showed villagers stopping to watch the fast-flowing water from the side of a riverbank.

Another showed a distraught woman getting into a wooden boat with her baby, saying that she had to wait to be rescued after the floodwater came and her mother was still trapped in a tree.

The prime minister of the Communist-run Southeast Asian nation, Thongloun Sisoulith, has suspended government meetings and led Cabinet members to monitor rescue and relief efforts in one of the affected areas, the state agency reported.

Villagers carry their belonging as they evacuate after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 24, 2018. REUTERS/Stringer

Villagers carry their belonging as they evacuate after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 24, 2018. REUTERS/Stringer

HYDROPOWER AMBITIONS A WORRY

One of Asia’s poorest and most secretive countries, Laos is landlocked, but aims to become the “battery of Asia” by selling power to neighbors through a series of hydropower dams.

Lao experienced one of its worst natural disasters in 2013 when five major monsoon storms hit the country in a period of three months, according to the ReliefWeb humanitarian information portal. It said that approximately 347,000 people were affected by severe flooding in that disaster.

Environmental rights groups have for years raised concerns about Laos’ hydropower ambitions, including worries over the impact of dams on the Mekong River, its flora and fauna and the rural communities and local economies that depend on it.

The collapsed dam was expected to start commercial operations by 2019 and export 90 percent of its power to Thailand under a Power Purchase Agreement between the Xe-Pian-Xe Namnoy Power Company (PNPC) and the Electricity Generating Authority of Thailand (EGAT).

The remaining 10 percent of power would be sold to the local grid under an agreement between the PNPC and the Electricite du Laos.

PNPC was established in 2012 by SK Engineering & Construction Co., Ltd, Korea Western Power Co. Ltd., Ratchaburi Electricity Generating Holding, Thailand’s largest private power producer, and Lao Holding State Enterprise (LHSE).

Ratchburi Electricity Generating Holding Company said in a statement the dam, which it referred to as ‘Saddle Dam D’, was eight meters (26 feet) wide, 770 meters (2,526 feet) long and 16 meters (52 feet) high.

The dam “was fractured and the water had leaked to the downstream area and down to the Xe-Pian River which is about five kilometers from the dam,” said Kijja Sripatthangkura, chief executive officer of Ratchaburi Electricity Generating Holding Company.

International Rivers, a U.S.-based group that works to protect rivers and the rights of communities dependent on them, said the accident exposed “major risks” associated with some dam designs that cannot cope with extreme weather conditions.

“Unpredictable and extreme weather events are becoming more frequent in Laos and the region due to climate change,” the group told Reuters in an e-mail.

“This also shows the inadequacy of warning systems for the dam construction and operations. The warning appeared to come very late and was ineffective in ensuring people had advance notice to ensure their safety and that of their families.”

(Reporting by Amy Sawitta Lefevre and Ju-min Park; Writing by John Chalmers; Editing by Michael Perry)

Hundreds leave homes near dangerously crumbling Puerto Rico dam

Local residents look at the flooded houses close to the dam of the Guajataca lake. REUTERS/Carlos Garcia Rawlins

By Dave Graham and Robin Respaut

SAN JUAN (Reuters) – Most people living near a crumbling dam in storm-battered Puerto Rico have been moved to safety, Governor Ricardo Rossello said on Monday, as he urged the U.S. Congress to fund an aid package to avert a humanitarian crisis after Hurricane Maria.

Most of the Caribbean island, a U.S. territory with a population of 3.4 million, is still without electricity five days after Maria swept ashore with ferocious winds and torrential rains, the most powerful hurricane to hit Puerto Rico for nearly a century.

There have been growing concerns for some 70,000 people who live in the river valley below the Guajataca Dam in the island’s northwest, where cracks were seen appearing on Friday in the 88-year-old earthen structure.

An aerial view shows the damage to the Guajataca dam. REUTERS/Alvin Baez

An aerial view shows the damage to the Guajataca dam. REUTERS/Alvin Baez

Rossello said he was working on the assumption that the dam would collapse. “I’d rather be wrong on that front than doing nothing and having that fail and costing people lives,” he said in an interview with CNN.

“Some of the dam has fallen apart and now we’re making sure that we can assess if the other part is going to fall down as well. … Most of the people in the near vicinity have evacuated.”

It was unclear if the governor was saying that most of the 70,000 valley inhabitants had left the area, or only the several hundred people living in the small towns closest to the dam. About 320 people from those towns have moved to safety, according to local media.

The fear of a potentially catastrophic dam break added to the difficulties facing disaster relief authorities after Maria, which was the second major hurricane to strike Caribbean this month and which killed at least 29 people in the region.

At least 10 of those who died were in Puerto Rico, including several people who drowned or were hit by flying debris, and three elderly sisters who died in a mudslide.

Many structures on the island, including hospitals, remain badly damaged and flooded. Clean drinking water is hard to find in some areas. Very few planes have been able to land or take off from damaged airports.

After Maria caused widespread flooding, the National Weather Service warned of further flash floods in some western parts of the island on Monday as thunderstorms moved in.

The hurricane hit at a time when Puerto Rico was already battling economic crisis. [nL2N1M31LR]

Rossello said on Monday that before the storms struck he had been embarking on an aggressive fiscal agenda that included more than $1.5 billion in cuts.

“This is a game changer,” the governor told CNN. “This is a completely different set of circumstances. This needs to be taken into consideration otherwise there will be a humanitarian crisis.”

In Washington, U.S. House of Representatives Speaker Paul Ryan said Congress was working with President Donald Trump’s administration to make sure the necessary assistance reaches Puerto Rico.

“Our fellow citizens in Puerto Rico remain in our prayers as we make sure they have what they need,” Ryan said in a statement.

Local residents react while they look at the water flowing over the road at the dam of the Guajataca lake.

Local residents react while they look at the water flowing over the road at the dam of the Guajataca lake.
REUTERS/Carlos Garcia Rawlins

Maria continued to weaken and would likely be downgraded from a hurricane to a tropical storm by Tuesday night, the National Hurricane Center said. As of 11 a.m. ET (1500 GMT) on Monday, it was about 315 miles (505 km) south-southeast of Cape Hatteras, North Carolina, heading slowly north, the center said.

The storm was unlikely to hit the continental United States directly, but a tropical storm warning was in effect for much of the North Carolina coast. Officials issued a mandatory evacuation order for visitors to Ocracoke Island in the Outer Banks, beginning at 5 a.m. ET (0900 GMT) on Monday.

 

(Reporting by Dave Graham and Robin Respaut; Additional reporting by Jonathan Allen and Peter Szekely in New York and Doina Chiacu in Washington; Editing by Daniel Wallis and Frances Kerry)

 

U.S.-backed militias oust Islamic State from Syria’s Tabqa old city

Syrian Democratic Forces fighters gesture while posing on a damaged airplane inside Tabqa military airport after taking control of it from Islamic State fighters, west of Raqqa city, Syria ,

BEIRUT (Reuters) – U.S.-backed militias said on Monday they had pushed Islamic State fighters out of the old quarters of Tabqa, a strategically vital town controlling Syria’s largest dam, hemming the militants into the remaining modern district along the shore.

The Syrian Democratic Forces (SDF), an alliance made up of Syrian Kurdish and Arab fighting groups, are fighting a multi-phased campaign to drive Islamic State from its stronghold of Raqqa, 40km (25 miles) downstream and east of Tabqa.

The SDF will wait to assault Raqqa until it seizes Tabqa, its military officials have previously said, but it had made slow progress since besieging the town in early April.

This changed on Thursday when the SDF began to advance north into the old city.

On Monday the SDF said in an online statement it had taken the last three neighborhoods of the old city and an adjoining industrial district.

SDF forces were now fighting Islamic State in the three modern quarters of the town which lie along the Tabqa reservoir, SDF spokesman Talal Silo said.

Islamic State still control the dam.

The Syrian Observatory for Human Rights, a Britain-based war monitor, said on Monday the SDF now controls about 80 percent of Tabqa.

In recent weeks the SDF has also squeezed Islamic State’s pocket of territory around Raqqa, which the jihadist group has used as a base to plot attacks and manage much of its self-declared caliphate since seizing the city in 2014.

(Reporting by Lisa Barrington; Editing by Toby Chopra)

Evacuees from California dam allowed home even as storms near

Oroville residents look at flooded area after evacuation order

By Deborah M. Todd

OROVILLE, Calif. (Reuters) – Californians who were ordered to evacuate due to a threat from the tallest dam in the United States can now return home after state crews working around the clock reinforced a drainage channel that was weakened by heavy rain.

Officials had ordered 188,000 people living down river from the Oroville Dam to evacuate on Sunday and reduced that to an evacuation warning on Tuesday, Butte County Sheriff Kory Honea said.

That means people can move back to their homes and businesses can reopen, but they should be prepared to evacuate again if necessary, Honea told a news conference.

Both the primary and backup drainage channels of the dam, known as spillways, were damaged by a buildup of water that resulted from an extraordinarily wet winter in Northern California that followed years of severe drought.

The greater danger was posed by the emergency spillway, which was subject to urgent repairs in recent days. Though damaged, the primary spillway was still useable, officials said.

More rain was forecast for as early as Wednesday and through Sunday, according to the National Weather Service, but the state Department of Water Resources said the upcoming storms were unlikely to threaten the emergency spillway.

Evacuees received more good news from President Donald Trump, who declared an emergency in the state, authorizing the Federal Emergency Management Agency and the Department of Homeland Security to coordinate disaster relief efforts.

The lifting of the mandatory evacuation improved the mood among evacuees at Silver Dollar Fairgrounds in Chico, where families packed cars and sifted through piles of donated clothing.

Philip Haar, 37, of Oroville, prepared to take his five dogs back home. He also would be able to feed the rabbit he left behind.

“I’m confident with the warning, at least we’ll know the next time something happens to be prepared more than this time,” Haar said.

But Richard and Anna Lawson of Oroville said they were not rushing home. Officials last week expressed calm, then abruptly ordered the evacuation on Sunday.

“They kept contradicting themselves. Every time they said something they turned around and said something different,” said Richard, 25.

“We’re waiting until tomorrow to hear something. We’re going to wait until the storm comes through,” said Anna, 21.

The sheriff credited swift action by the Department of Water Resources to shore up the emergency spillway and use the main spillway to relieve pressure on the dam, averting the immediate danger of a dam failure, Honea said.

A failure could have unleashed a wall of water three stories tall on towns below.

State officials used 40 trucks carrying 30 tons of rock per hour to reinforce the eroded area around the emergency spillway while two helicopters dropped rock and other materials into the breach.

“We’re aggressively attacking the erosion concerns that have been identified,” said William Croyle, acting director of the Department of Water Resources.

Water authorities had been relieving pressure on the dam through the concrete-lined primary spillway last week, but lake levels rose as storm water surged in and engineers moderated its use. Then the rising water topped over the earthen backup spillway, which has a concrete top, for the first time in the dam’s 50-year history over the weekend.

When the emergency spillway showed signs of erosion, engineers feared a 30-foot-high section could fail, leading to the evacuation order on Sunday. Both spillways are next to the dam, which itself is sound, engineers say.

(Additional reporting by Gina Cherelus and Sharon Bernstein; Writing by Daniel Trotta; Editing by Peter Henderson, James Dalgleish and Lisa Shumaker)

U.N. warns of catastrophic dam failure in Syria battle

Euphrates River at sunset in Syria

By Tom Miles

GENEVA (Reuters) – The United Nations is warning of catastrophic flooding in Syria from the Tabqa dam, which is at risk from high water levels, deliberate sabotage by Islamic State (IS) and further damage from air strikes by the U.S.-led coalition.

The earth-filled dam holds back the Euphrates River 40 km (25 miles) upstream of the IS stronghold of Raqqa and has been controlled by IS since 2014.

Water levels on the river have risen by about 10 meters since Jan. 24, due partly to heavy rainfall and snow and partly to IS opening three turbines of the dam, flooding riverside areas downstream, according to a U.N. report seen by Reuters on Wednesday.

“As per local experts, any further rise of the water level would submerge huge swathes of agricultural land along the river and could potentially damage the Tabqa Dam, which would have catastrophic humanitarian implications in all areas downstream,” it said.

The entrance to the dam was already damaged by airstrikes by the U.S.-led coalition, it said.

“For example, on 16 January 2017, airstrikes on the western countryside of Ar-Raqqa impacted the entrance of the Euphrates Dam, which, if further damaged, could lead to massive scale flooding across Ar-Raqqa and as far away as Deir-ez-Zor.”

The town of Deir-ez-Zor, or Deir al-Zor, is a further 140 km downstream from Raqqa, and is besieged by IS. The U.N. estimates that 93,500 civilians are trapped in the town, and it has been airdropping food to them for a year.

The U.S.-backed Syrian Democratic Forces (SDF) are undertaking a multiphased operation to encircle Raqqa, and have advanced to within a few kilometers of the dam. The SDF has previously said air strikes are not being used against IS near the dam to avoid damaging it.

As IS, also known as ISIL, retreats, its fighters have deliberately destroyed vital infrastructure, including three water stations and five water towers in the first three weeks of January, the U.N. report said.

“ISIL has reportedly mined water pumping stations on the Euphrates River which hinders the pumping of water and residents are resorting to untreated water from the Euphrates River.”

The U.N. has also warned of the danger of a collapse of the Mosul dam on the Tigris River in Iraq, which could affect 20 million people. The dam was briefly captured by IS in 2014, but remains at risk, with constant repairs needed to avoid disaster.

Last month Lise Grande, the top U.N. humanitarian official in Iraq and a trained hydrologist who is an expert on the Mosul dam, said a catastrophic burst could have “Biblical” consequences. The U.N. is preparing an international response in case the Mosul dam collapses.

(Reporting by Tom Miles; Editing by Toby Chopra)

No return home in sight for thousands of Californians sheltering from dam

Oroville Dam flooding in Calfornia

By Deborah M. Todd and Sharon Bernstein

OROVILLE, Calif. (Reuters) – Tens of thousands of Californians faced an indefinite stay in shelters as engineers worked for a second day on Tuesday to fix the United States’ tallest dam before more storms sweep the region.

After what looks set to be the wettest winter in Northern California following years of drought, more rain was forecast for as early as Wednesday and through Sunday, according to the National Weather Service.

Crews were working to shore up an overflow channel and drain the reservoir at the Lake Oroville Dam but authorities gave no indication of when it would be safe for people to go home.

Late on Sunday, about 188,000 residents were ordered to evacuate their homes in the Feather River valley below the dam, 65 miles (105 km) north of Sacramento.

Authorities say they had averted the immediate danger of a catastrophic failure at the dam that could unleash a wall of water three stories tall on towns below.

“We’re doing everything we can to get this dam in shape that they can return and they can live safely without fear. It’s very difficult,” California Governor Jerry Brown told reporters during a news conference on Monday evening.

On Monday, Brown sent a letter to U.S. President Donald Trump asking him to issue an emergency declaration, which would open up federal assistance for the affected communities, after an emergency overflow channel appeared on the brink of collapse.

Yolanda Davila, 62, of Thermalito, ended up at the Silver Dollar Fairgrounds in Chico, one of only five in the area taking people with pets. She left home without medicine and dog food in the rush to find shelter before the evacuation deadline.

She said that areas such as Sacramento had been issued flood warnings earlier in the week and that authorities should have warned residents near Oroville much sooner.

“We didn’t have a plan, all we knew is to head north toward Chico,” Davila said. “If I knew we had to get out earlier I would have went to the Bay Area.”

The earth-filled dam is just upstream and east of Oroville, a town of about 16,000 people. At 770 feet (230 meters) high, the structure, built between 1962 and 1968, it is more than 40 feet taller than the Hoover Dam.

On Monday afternoon, crews dropped large bags filled with rocks into a gap at the top of the emergency spillway to rebuild the eroded hillside.

The main spillway, a separate channel, is also damaged because part of its concrete lining fell apart last week. Both spillways are to the side of the dam itself, which has not been compromised, engineers said.

(Additional reporting by Brendan O’Brien in Milwaukee; Editing by Louise Ireland)