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As California cracks down on groundwater, what will happen to fallowed farmland?

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Tuesday, April 30, 2024

In summary California water regulators are cracking down on the overuse of groundwater by farmers. Enforcement could prompt them to idle thousands of acres of farmland and poses larger questions about what will happen to the affected fields. A couple of weeks ago, the California Water Resources Control Board put five agricultural water agencies in Kings County on probation for failing to adequately manage underground water supplies in the Tulare Lake Basin that have been seriously depleted due to overpumping. It was the state’s first major enforcement action under the State Groundwater Management Act, passed a decade ago to protect the aquifers that farmers have used to supplement or replace water from reservoirs that’s curtailed during periods of drought. In some areas, so much groundwater has been pumped that the land above it has collapsed, a phenomenon known as subsidence. The board’s action on April 16 not only subjects the Kings County agencies to fees and tighter monitoring but sends a message to irrigators throughout the state that they must get serious about eliminating overdrafts after having a decade to adopt aquifer management plans. Curtailing groundwater use is not an isolated event, but rather a significant piece of the state’s declared intent to reduce the share of water devoted to agriculture – roughly three quarters of overall human use – as the state adjusts to the effects of climate change. As if to punctuate that goal, federal water managers have told San Joaquin Valley farmers that despite two wet winters they will receive less than half of their contracted allocations of water during this year’s growing season. In decades past, when surface water from reservoirs has fallen short of demand, farmers have drilled deep wells to tap aquifers. With the state water board cracking down on groundwater, it is inevitable, experts say, that some fields will have to be taken out of production. The Public Policy Institute of California, which closely monitors management of the state’s water supply, has estimated that at least 500,000 acres of farmland will be fallowed when the groundwater law is fully implemented. Whose lands will be affected, what happens to idled acreage and the financial impacts are issues hovering over groundwater reduction. One day after the water board’s crackdown on Kings County, a hint of those issues surfaced as the Assembly Utilities and Energy Committee approved legislation that would make it easier for farmers whose access to groundwater is restricted to convert their fields into solar energy farms. Assembly Bill 2528, carried by Assemblyman Joaquin Arambula, a Fresno Democrat, would allow affected farmers to withdraw their land from Williamson Act conservation contracts and use it for solar power generation without paying the stiff cancellation fees now in current law. The six-decade-old Williamson Act gives farmers big reductions in their property taxes in return for making long-term commitments to keep land in agricultural production. Learn more about legislators mentioned in this story. Joaquin Arambula Democrat, State Assembly, District 31 (Fresno) Arambula told the committee that “many agricultural landowners are at risk of losing access to water that is essential for their ability to farm their land (and) this confluence of water sustainability needs and clean energy demand creates an opportunity for us to craft an approach that addresses multiple economic and environmental goals.” The bill is backed by the solar power industry and the Western Growers Association, which generally represents large farmers. However, the California Farm Bureau, with many relatively small farmers as members, is opposed, saying the bill could undermine the Williamson Act’s goal of conserving farmland. The split between the two farm groups implies that as groundwater is curtailed, there will be a scramble over the conversion of fallowed fields. Some farmers are already lining up deals with solar energy interests that would be even more lucrative if they can cancel their Williamson Act contracts without paying hefty cancellation fees, as much as 25% of the land’s value.

California water regulators are cracking down on the overuse of groundwater by farmers. Enforcement could prompt them to idle thousands of acres of farmland and poses larger questions about what will happen to the affected fields.

Sheep grazing near solar panels at the Kettleman City Power solar farm on July 27, 2022 Sheep are let into the facility to eat bugs and graze on dry grass that could be a fire hazard. Photo by Larry Valenzuela, CalMatters/CatchLight Local

In summary

California water regulators are cracking down on the overuse of groundwater by farmers. Enforcement could prompt them to idle thousands of acres of farmland and poses larger questions about what will happen to the affected fields.

A couple of weeks ago, the California Water Resources Control Board put five agricultural water agencies in Kings County on probation for failing to adequately manage underground water supplies in the Tulare Lake Basin that have been seriously depleted due to overpumping.

It was the state’s first major enforcement action under the State Groundwater Management Act, passed a decade ago to protect the aquifers that farmers have used to supplement or replace water from reservoirs that’s curtailed during periods of drought.

In some areas, so much groundwater has been pumped that the land above it has collapsed, a phenomenon known as subsidence.

The board’s action on April 16 not only subjects the Kings County agencies to fees and tighter monitoring but sends a message to irrigators throughout the state that they must get serious about eliminating overdrafts after having a decade to adopt aquifer management plans.

Curtailing groundwater use is not an isolated event, but rather a significant piece of the state’s declared intent to reduce the share of water devoted to agriculture – roughly three quarters of overall human use – as the state adjusts to the effects of climate change.

As if to punctuate that goal, federal water managers have told San Joaquin Valley farmers that despite two wet winters they will receive less than half of their contracted allocations of water during this year’s growing season.

In decades past, when surface water from reservoirs has fallen short of demand, farmers have drilled deep wells to tap aquifers. With the state water board cracking down on groundwater, it is inevitable, experts say, that some fields will have to be taken out of production.

The Public Policy Institute of California, which closely monitors management of the state’s water supply, has estimated that at least 500,000 acres of farmland will be fallowed when the groundwater law is fully implemented.

Whose lands will be affected, what happens to idled acreage and the financial impacts are issues hovering over groundwater reduction.

One day after the water board’s crackdown on Kings County, a hint of those issues surfaced as the Assembly Utilities and Energy Committee approved legislation that would make it easier for farmers whose access to groundwater is restricted to convert their fields into solar energy farms.

Assembly Bill 2528, carried by Assemblyman Joaquin Arambula, a Fresno Democrat, would allow affected farmers to withdraw their land from Williamson Act conservation contracts and use it for solar power generation without paying the stiff cancellation fees now in current law.

The six-decade-old Williamson Act gives farmers big reductions in their property taxes in return for making long-term commitments to keep land in agricultural production.

Learn more about legislators mentioned in this story.

Arambula told the committee that “many agricultural landowners are at risk of losing access to water that is essential for their ability to farm their land (and) this confluence of water sustainability needs and clean energy demand creates an opportunity for us to craft an approach that addresses multiple economic and environmental goals.”

The bill is backed by the solar power industry and the Western Growers Association, which generally represents large farmers. However, the California Farm Bureau, with many relatively small farmers as members, is opposed, saying the bill could undermine the Williamson Act’s goal of conserving farmland.

The split between the two farm groups implies that as groundwater is curtailed, there will be a scramble over the conversion of fallowed fields. Some farmers are already lining up deals with solar energy interests that would be even more lucrative if they can cancel their Williamson Act contracts without paying hefty cancellation fees, as much as 25% of the land’s value.

Read the full story here.
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Navy families report new water contamination

Families using the Navy's water system report new contamination, with lab results indicating the presence of PFAS chemicals.Catherine Cruz reports for Hawaii Public Radio.In short:Environmental groups held a news conference to discuss the PFAS contamination in water samples from Hickam, a military base.Red Hill Community Representation Initiative's Marti Townsend highlighted the dangers of overlapping water and fuel lines, leading to a toxic mix of chemicals.University of Hawaiʻi researchers found that fuel mixed with chlorine in water can create harmful substances, posing health risks such as cancer and liver damage.Key quote:"These two samples came from Hickam because these are military dependents who are living on base, and their water lines overlap with fuel lines. And they're basically living in a horrible toxic soup between the jet fuel that was released and mixed with chlorine to make toxic chemicals, and the PFAS, all of which you know affect your immune system."— Marti Townsend, chair of the Red Hill Community Representation InitiativeWhy this matters:Contaminated water poses serious health risks, particularly for immune system function, and this incident is another example of ongoing health issues with military base infrastructure. Read more: Pioneering study links testicular cancer among military personnel to ‘forever chemicals.’

Families using the Navy's water system report new contamination, with lab results indicating the presence of PFAS chemicals.Catherine Cruz reports for Hawaii Public Radio.In short:Environmental groups held a news conference to discuss the PFAS contamination in water samples from Hickam, a military base.Red Hill Community Representation Initiative's Marti Townsend highlighted the dangers of overlapping water and fuel lines, leading to a toxic mix of chemicals.University of Hawaiʻi researchers found that fuel mixed with chlorine in water can create harmful substances, posing health risks such as cancer and liver damage.Key quote:"These two samples came from Hickam because these are military dependents who are living on base, and their water lines overlap with fuel lines. And they're basically living in a horrible toxic soup between the jet fuel that was released and mixed with chlorine to make toxic chemicals, and the PFAS, all of which you know affect your immune system."— Marti Townsend, chair of the Red Hill Community Representation InitiativeWhy this matters:Contaminated water poses serious health risks, particularly for immune system function, and this incident is another example of ongoing health issues with military base infrastructure. Read more: Pioneering study links testicular cancer among military personnel to ‘forever chemicals.’

Thousands in Devon no longer have to boil drinking water, says supplier

But authorities say households in some areas need to continue safety measures amid waterborne parasitic diseaseAnger in Devon as more cases of waterborne disease expectedThousands of households in the Brixham area of Devon can now safely use and drink their tap water without having to boil it first, South West Water (SWW) has said.The water company said about 14,500 households in the Alston supply area can now use their tap water safely, although about 2,500 properties in Hillhead, upper parts of Brixham and Kingswear should continue to boil their supply before drinking it. Continue reading...

Thousands of households in the Brixham area of Devon can now safely use and drink their tap water without having to boil it first, South West Water (SWW) has said.The water company said about 14,500 households in the Alston supply area can now use their tap water safely, although about 2,500 properties in Hillhead, upper parts of Brixham and Kingswear should continue to boil their supply before drinking it.The decision was made in consultation with the UK Health Security Agency (UKHSA) and the local authority’s environmental health department.UKHSA has confirmed 46 cases of cryptosporidium infection in the Brixham area, while more than 100 other people have reported symptoms which include diarrhoea, stomach pains and dehydration.SWW’s chief customer officer, Laura Flowerdew, said: “Following rigorous testing this week, it is now safe to lift the boil water notice in the Alston water supply area. This decision has been supported by the government’s public health experts and the local authority’s environmental health department.“This situation has caused an immense amount of disruption, distress and anxiety. We are truly sorry this has happened.“The public rightly expect a safe, clean and reliable source of drinking water and on this occasion, we have fallen significantly short of expectations. We will not stop working until this has been fully resolved.“With the boil water notice still in place in Hillhead, upper parts of Brixham and Kingswear, we are urging customers who are unsure if they are still affected to visit the postcode checker on our website or call us so we can check for them.”More details soon …

Silver Shadows: The Quiet Conquest of São Paulo’s Waters by an Amazon Invader

In São Paulo, Brazil, the Silver croaker, an invasive species, has become the predominant fish in the Jaguari reservoir and surrounding rivers, significantly diminishing the...

A specimen of P. squamosissimus caught in the Chavantes reservoir (São Paulo state): originally from the North region, it may be competing with and contributing to a decline in the population of native species. However, it has become a key fishing resource in much of the country. Credit: Edmir Daniel Carvalho/CAUNESPIn São Paulo, Brazil, the Silver croaker, an invasive species, has become the predominant fish in the Jaguari reservoir and surrounding rivers, significantly diminishing the diversity of native fish species. Despite its economic importance, controlling its population poses significant ecological and legal challenges.The Silver croaker (Plagioscion squamosissimus), also known as corvina or pescada-branca in Portuguese, is native to the Amazon and is likely responsible for the significant decline in the diversity of native species in the Jaguari Reservoir, Jaguari River, and Rio do Peixe. These water bodies are integral components of the Cantareira Water Production System and the Paraíba do Sul Basin, located in São Paulo state, Brazil.As a top predator in the food network, the invader has negatively affected local biodiversity by bringing about detrimental changes to its taxonomic, functional and phylogenetic structure, according to a study published in Biological Invasions by researchers at São Paulo State University (UNESP). They analyzed fish monitoring data collected by power utility CESP (Companhia Energética de São Paulo), which has recorded the presence of the species in the reservoir since 2001. The data analyzed is for a period ending in 2016. In no more than ten years, P. squamosissimus has become the most abundant fish species in the reservoir.Research and Monitoring Efforts“Although this predator is widely distributed in hydroelectric dam reservoirs throughout Brazil, its potential effects on native species had never been studied before. Our analysis highlights considerable losses to fish species diversity in the region,” said Aymar Orlandi Neto, first author of the article. Conducted at the Ilha Solteira School of Engineering (FEIS-UNESP), the study was part of his PhD research at the Botucatu Institute of Biosciences (IBB-UNESP) with a scholarship from FAPESP. Some of the results were obtained while he was doing research at the University of Valencia in Spain with a scholarship from FAPESP.CESP does this monitoring of fauna to comply with environmental licensing rules for operation of the dam and power plant enforced by IBAMA, the main federal environmental agency. Every four months its technicians install nets at predetermined locations in the reservoir (between Jacareí and São José dos Campos) and on the Peixe and Jaguari, identify the species caught, and estimate their abundance.Effects on Native Predators“We analyzed 15 years of monitoring data and found the abundance of native predators, particularly the Thin dogfish (Oligosarcus hepsetus), to have declined significantly as P. squamosissimus preyed on smaller fish and became more abundant,” said Igor Paiva Ramos last author of the article and a professor at FEIS-UNESP.However, it is not possible to tell from the available data whether the decline of O. hepsetus was due to indirect competition, since both this species and the invader may prey on the same fish. Another possibility is that P. squamosissimus, which can reach 80 cm, preyed on O. hepsetus, which is much smaller (30 cm as an adult). The former typically inhabits standing water bodies, such as lakes, and has thrived in the reservoir, whereas O. hepsetus, the native predator, prefers running water.Economic ImpactInvader species are a global problem and occur in environments of all kinds, on land and in water. In Brazil, the annual damage caused by non-native animals, plants, and microorganisms has been estimated at BRL 15 billion (now about USD 2.9 billion).The figure is from the Thematic Report on Invasive Exotic Species, Biodiversity and Ecosystem Services, launched in March by the Brazilian Platform on Biodiversity and Ecosystem Services (BPBES), which is supported by FAPESP via its Research Program on Biodiversity Characterization, Conservation, Restoration and Sustainable Use (BIOTA-FAPESP).In the article on the UNESP study, the researchers stress that other introduced species appear in the records for the Jaguari reservoir, including the Peacock bass (Cichla spp.), also native to the Amazon, and Oreochromis niloticus and Coptodon rendalli, both of which are tilapias and originally from Africa, but their numbers are very small, reinforcing the conclusion that native diversity has dwindled due to P. squamosissimus.The diversity loss observed by the authors applies to all three dimensions considered when this type of impact is assessed – taxonomic, functional and phylogenetic. Species richness losses during the period analyzed were noted, alongside substitution of many rare specialist species by a few generalists, and significant differences were found in species composition and abundance in the local fish community, with entire evolutionary groups disappearing.Management ChallengesThere are no simple solutions to the problem. The species is seen as a key fishing resource for both subsistence and sport. Eradicating it could cause social problems. “The species has become very common throughout Brazil. It replaces native species and now plays a very important social role in local economies,” Ramos said.Nevertheless, he proposed measures similar to those taken in other countries to deal with invader species. One such measure would be to permit hunting of this species throughout the year without size limits or a ban during the reproductive period, with the aim of eradicating it or at least reducing its abundance.However, federal and state laws restrict fishing not just of native species, which is quite right, but also of invasive species to some extent. “This ends up perpetuating the species that are harmful to local fauna,” Orlandi Neto said.Ramos pointed out that eradication of invaders does not necessarily lead to a return of the natives. “We don’t know whether another invader will take the place of P. squamosissimus if it’s removed. The environment has been modified to such an extent that it may no longer be suitable for former inhabitants,” he said.Reference: “Long-term impact of an invasive predator on the diversity of fish assemblages in a neotropical reservoir” by Aymar Orlandi Neto, Danilo Caneppele, Hugo Marques, João Henrique Pinheiro Dias, Juan Antonio Balbuena, Claudio de Oliveira and Igor Paiva Ramos, 14 February 2024, Biological Invasions.DOI: 10.1007/s10530-023-03243-9

MIT Engineers Create Game-Changing Lead Detection Device

A new chip-scale device could provide sensitive detection of lead levels in drinking water, whose toxicity affects 240 million people worldwide. Engineers at MIT and...

Artist’s impression of the chip surface, showing the on-chip light interferometer used to sense the presence of lead. The lead binding process to the crown ether is shown in the inset. Credit: Jia Xu Brian SiaA new chip-scale device could provide sensitive detection of lead levels in drinking water, whose toxicity affects 240 million people worldwide.Engineers at MIT and collaborators have developed a compact, inexpensive technology to detect and measure lead in water. This new system uses a photonic chip and crown ethers to capture lead ions, providing accurate, near-instant results with just a droplet of water.Engineers at MIT, Nanyang Technological University, and several companies have developed a compact and inexpensive technology for detecting and measuring lead concentrations in water, potentially enabling a significant advance in tackling this persistent global health issue. The World Health Organization estimates that 240 million people worldwide are exposed to drinking water that contains unsafe amounts of toxic lead, which can affect brain development in children, cause birth defects, and produce a variety of neurological, cardiac, and other damaging effects. In the United States alone, an estimated 10 million households still get drinking water delivered through lead pipes.Testing setup of the photonic chip sensor, including microfluidic chamber to transport analyte solutions and optical fibers on the sides to measure the photonic response of the chip. Credit: Courtesy of the researchers“It’s an unaddressed public health crisis that leads to over 1 million deaths annually,” says Jia Xu Brian Sia, an MIT postdoc and the senior author of the paper describing the new technology.However, testing for lead in water requires expensive, cumbersome equipment and typically requires days to get results. Or, it uses simple test strips that simply reveal a yes-or-no answer about the presence of lead but no information about its concentration. Current EPA regulations require drinking water to contain no more than 15 parts per billion of lead, a concentration so low it is difficult to detect.Innovative Photonic Chip TechnologyThe new system, which could be ready for commercial deployment within two or three years, could detect lead concentrations as low as 1 part per billion, with high accuracy, using a simple chip-based detector housed in a handheld device. The technology gives nearly instant quantitative measurements and requires just a droplet of water.The findings are described in a paper published on May 14 in the journal Nature Communications, by Sia, MIT graduate student and lead author Luigi Ranno, Professor Juejun Hu, and 12 others at MIT and other institutions in academia and industry.Jia Xu Brian Sia (left) and Luigi Ranno (right) showcasing the fully packaged sensor chip and microfluidic chamber. Credit: Courtesy of the researchersThe team set out to find a simple detection method based on the use of photonic chips, which use light to perform measurements. The challenging part was finding a way to attach to the photonic chip surface certain ring-shaped molecules known as crown ethers, which can capture specific ions such as lead. After years of effort, they were able to achieve that attachment via a chemical process known as Fischer esterification. “That is one of the essential breakthroughs we have made in this technology,” Sia says.In testing the new chip, the researchers showed that it can detect lead in water at concentrations as low as one part per billion. At much higher concentrations, which may be relevant for testing environmental contamination such as mine tailings, the accuracy is within 4 percent.Versatility and Practical ApplicationsThe device works in water with varying levels of acidity, ranging from pH values of 6 to 8, “which covers most environmental samples,” Sia says. They have tested the device with seawater as well as tap water, and verified the accuracy of the measurements.In order to achieve such levels of accuracy, current testing requires a device called an inductive coupled plasma mass spectrometer. “These setups can be big and expensive,” Sia says. The sample processing can take days and requires experienced technical personnel.While the new chip system they developed is “the core part of the innovation,” Ranno says, further work will be needed to develop this into an integrated, handheld device for practical use. “For making an actual product, you would need to package it into a usable form factor,” he explains. This would involve having a small chip-based laser coupled to the photonic chip. “It’s a matter of mechanical design, some optical design, some chemistry, and figuring out the supply chain,” he says. While that takes time, he says, the underlying concepts are straightforward.The system can be adapted to detect other similar contaminants in water, including cadmium, copper, lithium, barium, cesium, and radium, Ranno says. The device could be used with simple cartridges that can be swapped out to detect different elements, each using slightly different crown ethers that can bind to a specific ion.Impact on Global Health“There’s this problem that people don’t measure their water enough, especially in the developing countries,” Ranno says. “And that’s because they need to collect the water, prepare the sample, and bring it to these huge instruments that are extremely expensive.” Instead, “having this handheld device, something compact that even untrained personnel can just bring to the source for on-site monitoring, at low costs,” could make regular, ongoing widespread testing feasible.Hu, who is the John F. Elliott Professor of Materials Science and Engineering, says, “I’m hoping this will be quickly implemented, so we can benefit human society. This is a good example of a technology coming from a lab innovation where it may actually make a very tangible impact on society, which is of course very fulfilling.”“If this study can be extended to simultaneous detection of multiple metal elements, especially the presently concerning radioactive elements, its potential would be immense,” says Hou Wang, an associate professor of environmental science and engineering at Hunan University in China, who was not associated with this work.Wang adds, “This research has engineered a sensor capable of instantaneously detecting lead concentration in water. This can be utilized in real-time to monitor the lead pollution concentration in wastewater discharged from industries such as battery manufacturing and lead smelting, facilitating the establishment of industrial wastewater monitoring systems. I think the innovative aspects and developmental potential of this research are quite commendable.”Wang Qian, a principal research scientist at the Institute of Materials Research in Singapore, who also was not affiliated with this work, says, “The ability for the pervasive, portable, and quantitative detection of lead has proved to be challenging primarily due to cost concerns. This work demonstrates the potential to do so in a highly integrated form factor and is compatible with large-scale, low-cost manufacturing.”Reference: “Crown ether decorated silicon photonics for safeguarding against lead poisoning” by Luigi Ranno, Yong Zen Tan, Chi Siang Ong, Xin Guo, Khong Nee Koo, Xiang Li, Wanjun Wang, Samuel Serna, Chongyang Liu, Rusli, Callum G. Littlejohns, Graham T. Reed, Juejun Hu, Hong Wang and Jia Xu Brian Sia, 14 May 2024, Nature Communications.DOI: 10.1038/s41467-024-47938-6The team included researchers at MIT, at Nanyang Technological University and Temasek Laboratories in Singapore, at the University of Southampton in the U.K., and at companies Fingate Technologies, in Singapore, and Vulcan Photonics, headquartered in Malaysia. The work used facilities at MIT.nano, the Harvard University Center for Nanoscale Systems, NTU’s Center for Micro- and Nano-Electronics, and the Nanyang Nanofabrication Center.

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