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Home US-Mexico Border

Visualizing the aquifers that straddle the U.S.-Mexico border — Excessive Nation Information – Know the West

by Jane Holland
November 3, 2021
in US-Mexico Border
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For the primary time, scientists have mapped out the groundwater the 2 nations share.

 


Hydrogeological items between Mexico and the U.S.

Final 12 months, amid widespread drought, a violent protest over water erupted in Chihuahua, Mexico, a state within the northwestern a part of the nation. Native farmers armed themselves with sticks, rocks and Molotov cocktails and took over the Boquilla Dam, which was holding the water they desperately wanted to irrigate their crops. Two folks died in confrontations with Mexican troopers. 

The water in query was imagined to be despatched to farmers in Texas, a part of a water cost below a 1944 treaty between the U.S. and Mexico that allocates water from the Rio Grande. 

The dam standoff in Mexico hints on the conflicts that would come up as local weather change and rising water shortage pressure this shared useful resource. However little is understood in regards to the state of the water that lies beneath the floor—the area’s shared aquifers. 

A current examine on binational groundwater may assist change that. Printed in October, a sequence of maps from two Texas researchers exhibits the place underground water flows, and provides policymakers a typical software for learning aquifers that straddle the U.S.-Mexico border. Rosario Sánchez, a senior analysis scientist on the Texas Water Assets Institute at Texas A&M, and Laura Rodriguez, a geologist and graduate analysis assistant at Texas A&M, mapped 39 of those formations, that straddle the Borderlands within the Southwestern states of Arizona, New Mexico and California. Not like the Colorado River, groundwater shouldn’t be regulated binationally: The U.S. and Mexico have but to signal any treaties to collectively handle them. In reality, each nations are nonetheless simply starting to grasp the aquifers’ significance.  

Researchers began by analyzing the out there historic analysis, scientific literature and knowledge from either side of the border. They centered on geologic traits to find out their potential for storing water. If the rock is porous, for instance, that would point out that it could maintain extra water. Based on their paper, round 40% present “good-to-moderate” aquifer potential, which means {that a} important quantity of water might be extracted. 

“This paper delves deeper than most within the vital function that the geology (bedrock, laborious rock, crystalline rock) performs within the formation and understanding of southwest’s semi-arid aquifer methods,” Floyd Grey, a geologist with the USA Geological Survey (USGS), instructed Excessive Nation News in an e-mail.  

  • Transboundary map, West Sonora, Mexico, to West Arizona, U.S.

  • Transboundary map, Chihuahua, Mexico, to New Mexico, U.S.

  • Transboundary map, East Sonora, Mexico, to East Arizona, U.S.

  • Transboundary map, Baja California, Mexico and California, U.S.

Previous to the October analysis, particulars about these transboundary aquifer methods had been scarce. “The massive drawback is that each one the boundaries that the nations used to delineate (the aquifers) all of them stopped on the border,” mentioned Sánchez.  

The findings will inform a rising effort to grasp what water lies underground. “Maps like these are essential to creating a typical understanding of what these aquifer methods seem like and their traits in order that we will then get to some dialogue,” mentioned Sharon Megdal, director of the College of Arizona Water Assets Analysis Heart, who was not concerned within the analysis. For instance: “What can we do about aquifers that seem like overexploited?”  

Nonetheless, many questions stay as scientists work to get a clearer image of the transboundary aquifers. “It is a excellent bodily geological characterization, however it isn’t a mannequin of groundwater use,” mentioned Megdal. “It is advisable mix this form of data with different data to get a extra full image of what the groundwater scenario is. … What are the vulnerabilities?”  

Megdal, who has participated in binational assessments of the Santa Cruz and San Pedro aquifers, which cross Arizona’s border into Sonora, mentioned altering precipitation patterns and overuse are already impacting groundwater recharge. The Santa Cruz aquifer, for instance, the principle water supply for Ambos Nogales, two border cities separated by the wall, already has a water deficit. “It’s not getting in a constructive course,” she mentioned.  

Groundwater administration has taken on higher urgency around the globe. In December, each Megdal and Sánchez will current their work at a UNESCO convention on Transboundary Aquifers that can deal with the query of governance. Sánchez hopes the U.S. and Mexico will collaborate on an answer. 

“The reliance on floor water from each the Rio Grande or the Rio Colorado is actually not an choice for the long run,” mentioned Sánchez. “The water might be coming from groundwater.”

Jessica Kutz is an assistant editor for Excessive Nation Information. We welcome reader letters. E mail her at [email protected] or submit a letter to the editor. See our letters to the editor policy.

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Jane Holland

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