The Times Australia
The Times World News

.
The Times Real Estate

.

'Megadrought' along border strains US-Mexico water relations

  • Written by Robert Gabriel Varady, Research Professor of Environmental Policy, University of Arizona

The United States and Mexico are tussling over their dwindling shared water supplies[1] after years of unprecedented heat and insufficient rainfall.

Map showing the American Southwest and northern Mexico The Colorado River Basin. U.S. Geological Survey[2]

Sustained drought on the middle-lower Rio Grande since the mid-1990s means less Mexican water flows to the U.S.[3] The Colorado River Basin, which supplies seven U.S. states and two Mexican states, is also at record low levels[4].

A 1944 treaty[5] between the U.S. and Mexico governs water relations between the two neighbors. The International Boundary and Water Commission it established to manage the 450,000-square-mile Colorado and Rio Grande basins has done so adroitly, according to our research[6].

That able management kept U.S.-Mexico water relations mostly conflict-free. But it masked some well-known underlying stresses[7]: a population boom on both sides of the U.S.-Mexico border, climate change and aging waterworks.

1944 to 2021

The mostly semiarid U.S.-Mexico border region receives less than 18 inches of annual rainfall, with large areas getting under 12 inches. That’s less than half the average annual rainfall in the U.S., which is mainly temperate[8].

The 1940s, however, were a time of unusual water abundance on the treaty rivers. When American and Mexican engineers drafted the 1944 water treaty, they did not foresee today’s prolonged megadrought[9].

Nor did they anticipate the region’s rapid growth. Since 1940 the population of the 10 largest pairs of cities that straddle the U.S.-Mexico border[10] has mushroomed nearly twentyfold, from 560,000 people to some 10 million today[11].

This growth is powered by a booming, water-dependent manufacturing industry in Mexico that exports products to U.S. markets. Irrigated agriculture, ranching and mining compete with growing cities and expanding industry for scarce water.

'Megadrought' along border strains US-Mexico water relations Lake Mead circa 1950, left, and Lake Mead in June 2021. The surrounding cliffs show the substantial drop in water level. William M. Graham/Archive Photos/Getty Images and Ethan Miller/Getty Images

Today, there’s simply not enough of it to meet demand[12] in the border areas governed by the 1944 treaty.

Three times since 1992 Mexico has fallen short of its five-year commitment to send 1.75 million acre-feet of water across the border to the U.S. Each acre-foot can supply a U.S. family of four for one year.

Water conflicts

In the fall of 2020, crisis erupted in the Rio Grande Valley after years of rising tensions and sustained drought that endanger crops and livestock in both the U.S. and Mexico.

In September 2020, Texas Gov. Greg Abbott declared that “Mexico owes Texas a year’s worth of Rio Grande water[13].” The next month, workers in Mexico released water from a dammed portion of Mexico’s Río Conchos destined to flow across the border to partially repay Mexico’s 345,600-acre-foot water debt to the U.S.

Frustrated farmers and protesters in the Mexican state of Chihuahua clashed with Mexican soldiers[14] sent to protect the workers. A 35-year-old farmer’s wife and mother of three was killed.

Mexico also agreed to transfer its stored water at Amistad Dam to the U.S., fulfilling its obligation just three days before its Oct. 25, 2020, deadline[15]. That decision satisfied its water debt to the U.S. under the 1944 treaty but jeopardized the supply of more than a million Mexicans living downstream of Amistad Dam in the Mexican states of Coahuila and Tamaulipas.

'Megadrought' along border strains US-Mexico water relations Mexican National Guard troops stand guard at Las Pilas dam after 2020 clashes with farmers in Chihuahua State. AP Photo/Christian Chavez[16]

The U.S. and Mexico pledged to revisit the treaty’s Rio Grande water rules in 2023[17].

The drought dilemma on the Colorado River is similarly dire. The water level at Lake Mead, a major reservoir for communities in the lower Colorado River Basin, has dropped nearly 70% over 20 years[18], threatening the water supply of Arizona, California and Nevada[19].

In 2017, the U.S. and Mexico signed a temporary “shortage-sharing solution.” That agreement, forged under the authority of the 1944 treaty, allowed Mexico to store part of its treaty water in U.S. reservoirs upstream.

Saving a strained treaty

Water shortages along the U.S.-Mexico border also threaten the natural environment. As water is channeled to farms and cities, rivers are deprived of the flow necessary to support habitats, fish populations and overall river health.

The 1944 water treaty was silent on conservation. For all its strengths, it simply allocates the water of the Rio Grande and Colorado rivers. It does not contemplate the environmental side of water use.

But the treaty is reasonably elastic[20], so its members can update it as conditions change. In recent years, conservation organizations and scientists have promoted the environmental and human benefits of restoration[21]. New Colorado River agreements now recognize ecological restoration as part of treaty-based water management.

Environmental projects are underway in the lower Colorado River to help restore the river’s delta, emphasizing native vegetation like willows and cottonwoods. These trees provide habitat for such at-risk birds as the yellow-billed cuckoo and the Yuma clapper rail[22], and for numerous species that migrate along this desolate stretch of the Pacific Flyway[23].

'Megadrought' along border strains US-Mexico water relations The Rio Grande Basin. U.S. Geological Survey[24]

Currently, no such environmental improvements are planned for the Rio Grande.

But other lessons learned on the Colorado[25] are now being applied to the Rio Grande. Recently, Mexico and the U.S. created a permanent binational advisory body for the Rio Grande similar to the one established in 2010 to oversee the health and ecology of the Colorado[26].

Another recent agreement permits each country to monitor the other’s use of Rio Grande water using common diagnostics like Riverware, a dynamic modeling tool for monitoring water storage and flows[27]. Mexico also has agreed to try to use water more efficiently, allowing more of it to flow to the U.S.

Newly created joint teams of experts will study treaty compliance and recommend further changes needed to manage climate-threatened waters along the U.S.-Mexico border sustainably[28] and cooperatively.

Incremental treaty modifications like these could palpably reduce the past year’s tensions and revitalize a landmark U.S.-Mexico treaty that’s buckling under the enormous strain of climate change.

[This week in religion, a global roundup each Thursday. Sign up.[29]]

References

  1. ^ tussling over their dwindling shared water supplies (www.brookings.edu)
  2. ^ U.S. Geological Survey (www.usgs.gov)
  3. ^ less Mexican water flows to the U.S. (www.lawtext.com)
  4. ^ at record low levels (theconversation.com)
  5. ^ 1944 treaty (www.ibwc.gov)
  6. ^ according to our research (doi.org)
  7. ^ well-known underlying stresses (digitalrepository.unm.edu)
  8. ^ less than half the average annual rainfall in the U.S., which is mainly temperate (www.swcarr.arizona.edu)
  9. ^ foresee today’s prolonged megadrought (digitalrepository.unm.edu)
  10. ^ cities that straddle the U.S.-Mexico border (www.tceq.texas.gov)
  11. ^ 560,000 people to some 10 million today (www.wilkie-stats.org)
  12. ^ not enough of it to meet demand (digitalrepository.unm.edu)
  13. ^ Mexico owes Texas a year’s worth of Rio Grande water (www.elpasotimes.com)
  14. ^ clashed with Mexican soldiers (www.aljazeera.com)
  15. ^ just three days before its Oct. 25, 2020, deadline (abcnews.go.com)
  16. ^ AP Photo/Christian Chavez (newsroom.ap.org)
  17. ^ revisit the treaty’s Rio Grande water rules in 2023 (www.bakerinstitute.org)
  18. ^ nearly 70% over 20 years (www.azcentral.com)
  19. ^ water supply of Arizona, California and Nevada (www.usatoday.com)
  20. ^ reasonably elastic (doi.org)
  21. ^ environmental and human benefits of restoration (doi.org)
  22. ^ yellow-billed cuckoo and the Yuma clapper rail (www.allaboutbirds.org)
  23. ^ desolate stretch of the Pacific Flyway (raisetheriver.org)
  24. ^ U.S. Geological Survey (www.usgs.gov)
  25. ^ other lessons learned on the Colorado (doi.org)
  26. ^ oversee the health and ecology of the Colorado (www.ibwc.gov)
  27. ^ monitoring water storage and flows (www.colorado.edu)
  28. ^ manage climate-threatened waters along the U.S.-Mexico border sustainably (nepis.epa.gov)
  29. ^ Sign up. (theconversation.com)

Read more https://theconversation.com/megadrought-along-border-strains-us-mexico-water-relations-160338

The Times Features

Why Staying Safe at Home Is Easier Than You Think

Staying safe at home doesn’t have to be a daunting task. Many people think creating a secure living space is expensive or time-consuming, but that’s far from the truth. By focu...

Lauren’s Journey to a Healthier Life: How Being a Busy Mum and Supportive Wife Helped Her To Lose 51kg with The Lady Shake

For Lauren, the road to better health began with a small and simple but significant decision. As a busy wife and mother, she noticed her husband skipping breakfast and decided ...

How to Manage Debt During Retirement in Australia: Best Practices for Minimising Interest Payments

Managing debt during retirement is a critical step towards ensuring financial stability and peace of mind. Retirees in Australia face unique challenges, such as fixed income st...

hMPV may be spreading in China. Here’s what to know about this virus – and why it’s not cause for alarm

Five years on from the first news of COVID, recent reports[1] of an obscure respiratory virus in China may understandably raise concerns. Chinese authorities first issued warn...

Black Rock is a popular beachside suburb

Black Rock is indeed a popular beachside suburb, located in the southeastern suburbs of Melbourne, Victoria, Australia. It’s known for its stunning beaches, particularly Half M...

What factors affect whether or not a person is approved for a property loan

Several factors determine whether a person is approved for a real estate loan. These factors help lenders assess the borrower’s ability to repay the loan and the risk involved...

Times Magazine

Lessons from the Past: Historical Maritime Disasters and Their Influence on Modern Safety Regulations

Maritime history is filled with tales of bravery, innovation, and, unfortunately, tragedy. These historical disasters serve as stark reminders of the challenges posed by the seas and have driven significant advancements in maritime safety regulat...

What workers really think about workplace AI assistants

Imagine starting your workday with an AI assistant that not only helps you write emails[1] but also tracks your productivity[2], suggests breathing exercises[3], monitors your mood and stress levels[4] and summarises meetings[5]. This is not a f...

Aussies, Clear Out Old Phones –Turn Them into Cash Now!

Still, holding onto that old phone in your drawer? You’re not alone. Upgrading to the latest iPhone is exciting, but figuring out what to do with the old one can be a hassle. The good news? Your old iPhone isn’t just sitting there it’s potential ca...

Rain or Shine: Why Promotional Umbrellas Are a Must-Have for Aussie Brands

In Australia, where the weather can swing from scorching sun to sudden downpours, promotional umbrellas are more than just handy—they’re marketing gold. We specialise in providing wholesale custom umbrellas that combine function with branding power. ...

Why Should WACE Students Get a Tutor?

The Western Australian Certificate of Education (WACE) is completed by thousands of students in West Australia every year. Each year, the pressure increases for students to perform. Student anxiety is at an all time high so students are seeking suppo...

What Are the Risks of Hiring a Private Investigator

I’m a private investigator based in Melbourne, Australia. Being a Melbourne Pi always brings interesting clients throughout Melbourne. Many of these clients always ask me what the risks are of hiring a private investigator.  Legal Risks One of the ...

LayBy Shopping