Releases from the Aspinall Unit will be decreased from 1550 cfs to 1450 cfs on Tuesday, July 21st. Releases are being adjusted to maintain flows near the baseflow target in the lower Gunnison River. The July 15th runoff forecast for Blue Mesa Reservoir predicts 57% of average for April-July inflows.
There is a drought rule in the Aspinall Unit Operations EIS which has changed the baseflow target at the Whitewater gage. The rule states that during Dry or Moderately Dry years, when the content of Blue Mesa Reservoir drops below 600,000 AF the baseflow target is reduced from 1050 cfs to 900 cfs. Therefore, the baseflow target for July and August will now be 900 cfs.
Flows in the lower Gunnison River are currently above the baseflow target of 900 cfs. River flows are expected to stay at levels above the baseflow target after the release decrease has arrived at the Whitewater gage.
Currently, Gunnison Tunnel diversions are 1050 cfs and flows in the Gunnison River through the Black Canyon are around 550 cfs. After this release change Gunnison Tunnel diversions will still be around 1050 cfs and flows in the Gunnison River through the Black Canyon will be around 450 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.
U.S. Commissioner Jayne Harkins of the International Boundary and Water Commission, United States and Mexico, today reiterated that Mexico must take immediate action to deliver Rio Grande water to the United States to comply with the bilateral 1944 Water Treaty. Under the treaty, Rio Grande water is allotted to the United States in quantities calculated based on cycles of five years. The current cycle ends on October 24, 2020. To meet its international obligations, Mexico must deliver an additional 416,829 acre-feet (514.2 million cubic meters [mcm]) to the United States between now and the end of the cycle.
“Mexican government officials have stated there is enough water stored in the Mexican reservoirs to enable Mexico to meet the needs of Chihuahua farmers during this year’s irrigation season while complying with the treaty. They need to increase their water releases to the United States immediately,” said Commissioner Harkins. “Mexico has failed to implement releases promised earlier and continuing to delay increases the risk of Mexico failing to meet its delivery obligation.”
Commissioner Emily Lindley of the Texas Commission on Environmental Quality said, “Mexico has not honored its commitments. Texas farmers, irrigators, municipalities, and industries along the Rio Grande rely on water that should be delivered as laid out in the 1944 Treaty. I echo Commissioner Harkins that it is vital Mexico deliver water immediately to the U.S.”
Mexico has only delivered 1,333,171 acre-feet (1,644 mcm) out of the minimum five- year obligation of 1,750,000 acre-feet (2,159 mcm). The remaining volume yet to be delivered exceeds the 350,000 acre-feet (431.7 mcm) minimum average volume the 1944 Water Treaty requires over an entire year, demonstrating that immediate action is required.
“I want to emphasize that farmers and cities in South Texas rely on this water to get them through the summer,” Commissioner Harkins added.
Under the 1944 Water Treaty, Mexico delivers Rio Grande water to the United States while the United States delivers Colorado River water to Mexico. The United States continues to meet its obligations to deliver Colorado River water and expects Mexico to fulfill its Rio Grande obligations to the United States. The International Boundary and Water Commission is responsible for applying the boundary and water treaties between the United States and Mexico.
Here’s the release from Rice University (Jade Boyd):
Rice’s trap-and-zap strategy for antibiotic resistant bugs becomes wrap, trap and zap
A shield of graphene helps particles destroy antibiotic-resistant bacteria and free-floating antibiotic resistance genes in wastewater treatment plants.
Think of the new strategy developed at Rice University as “wrap, trap and zap.”
The labs of Rice environmental scientist Pedro Alvarez and Yalei Zhang, a professor of environmental engineering at Tongji University, Shanghai, introduced microspheres wrapped in graphene oxide in the Elsevier journal Water Research.
Alvarez and his partners in the Rice-based Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT) have worked toward quenching antibiotic-resistant “superbugs” since first finding them in wastewater treatment plants in 2013.
“Superbugs are known to breed in wastewater treatment plants and release extracellular antibiotic resistance genes (ARGs) when they are killed as the effluent is disinfected,” Alvarez said. “These ARGs are then discharged and may transform indigenous bacteria in the receiving environment, which become resistome reservoirs.
“Our innovation would minimize the discharge of extracellular ARGs, and thus mitigate dissemination of antibiotic resistance from wastewater treatment plants,” he said.
The Rice lab showed its spheres — cores of bismuth, oxygen and carbon wrapped with nitrogen-doped graphene oxide — inactivated multidrug-resistant Escherichia coli bacteria and degraded plasmid-encoded antibiotic-resistant genes in secondary wastewater effluent.
The graphene-wrapped spheres kill nasties in effluent by producing three times the amount of reactive oxygen species (ROS) as compared to the spheres alone.
The spheres themselves are photocatalysts that produce ROS when exposed to light. Lab tests showed that wrapping the spheres minimized the ability of ROS scavengers to curtail their ability to disinfect the solution.
The researchers said nitrogen-doping the shells increases their ability to capture bacteria, giving the catalytic spheres more time to kill them. The enhanced particles then immediately capture and degrade the resistant genes released by the dead bacteria before they contaminate the effluent.
“Wrapping improved bacterial affinity for the microspheres through enhanced hydrophobic interaction between the bacterial surface and the shell,” said co-lead author Pingfeng Yu, a postdoctoral research associate at Rice’s Brown School of Engineering. “This mitigated ROS dilution and scavenging by background constituents and facilitated immediate capture and degradation of the released ARGs.”
Because the wrapped spheres are large enough to be filtered out of the disinfected effluent, they can be reused, Yu said. Tests showed the photocatalytic activity of the spheres was relatively stable, with no significant decrease in activity after 10 cycles. That was significantly better than the cycle lifetime of the same spheres minus the wrap.
Deyi Li of Tongji University, Shanghai, is co-lead author of the paper. Co-authors are Xuefei Zhou and Zhang of Tongji and Jae-Hong Kim, the Henry P. Becton Sr. Professor and Chair of Chemical and Environmental Engineering at Yale University. Alvarez is the George R. Brown Professor of Civil and Environmental Engineering, a professor of chemistry, of materials science and nanoengineering, and of chemical and biomolecular engineering and director of NEWT.
The National Science Foundation, the National Natural Science Foundation of China and the National Key R&D Program of China supported the research.
Jade Boyd is science editor and associate director of news and media relations in Rice University’s Office of Public Affairs.
2020 has been a tumultuous year, and as we enter our fifth month of quarantine and social distancing, it can be encouraging to find things to celebrate. With the close of Colorado’s legislative session last month and Governor Polis finalizing his bill signings, one thing that we can laud is the work that was accomplished for our rivers. Even though the Colorado General Assembly struggled to fully address a more than $3 billion budget shortfall, they maintained and expanded programs and investments necessary to keep our rivers flowing, and this is something we can be proud of.
In March, Governor Polis signed two bills into law that expand and improve Colorado’s instream flow program. These bills, HB20-1157 and HB20-1037, provide new tools for water users and conservationists to work together to keep water in rivers for the benefit of fish and wildlife. HB20-1157 will be a particularly important tool for the Yampa River Fund which provides grants to improve the health of the Yampa River, including through leases of water from Stagecoach Reservoir to enhance late-season fish habitat, agriculture, and to benefit the local tourism and outdoor recreation economy.
Colorado also made a new commitment to improve water conservation in our cities and towns. The Colorado Water Plan, finalized in 2015, sets a goal of achieving 400,000 acre-feet of municipal and industrial water conservation savings by 2050. The way that we plan and build our cities and towns contributes to how we use water, how much we use, and how quickly demands grow for new supplies. The new law, HB20-1095, authorizes local governments to include water conservation elements into their master plans, thereby encouraging local governments to combine their land and water use planning to accelerate the state toward its 400,000 acre-foot conservation savings goal.
While budgets were slashed statewide, fortunately funding for the implementation of Colorado’s Water Plan was maintained. Over $7 million was included in the Colorado Water Conservation Board budget for Water Plan implementation grants or water projects across the state, and an additional $4 million was allocated to invest in stream and watershed management planning efforts to keep rivers healthy and flowing. We appreciate the state’s continued recognition of the importance of clean rivers and drinking water for all Coloradans and hope that this commitment continues.
Just over six months ago, voters demonstrated their own commitment to healthy rivers and water supplies by legalizing sports betting and directing tax revenues to fund the implementation of Colorado’s Water Plan. As sports begin to start back up, we urge the General Assembly to respect the will of the voters and ensure this tax revenue is directed, as intended, to Water Plan implementation.
While we celebrate these wins for Colorado’s waterways, we recognize there is still more work to be done.
In June, the Trump administration issued rules that significantly reduce protections for Colorado’s rivers and wetlands under the Clean Water Act, leaving many previously protected waterways in limbo. The new federal rule leaves one out of every five stream miles in Colorado, including half of the state’s wetlands, unprotected from construction activity discharges. Thanks to a lawsuit led by Colorado Attorney General Phil Weiser, the rule has been temporarily blocked pending resolution, which maintains protections for our state’s waterways—for now.
Regardless of the outcome in court, it is time for Colorado to ensure that its rivers and wetlands will always be protected from destructive dumping and discharges. The Water community is coming together—virtually—this summer to try to find some common ground on this issue and we plan to bring a solution before the General Assembly for the 2021 legislative session.
While 2020 seems to be the year of one bad headline after the next, we are heartened by the work of our state legislature and government to make positive strides toward safeguarding our water future.