If Washington state issues additional permits for water to be diverted from the Columbia River for farm irrigation, it should do so only under the condition that withdrawals can be stopped if river flows become critically low for endangered and threatened salmon, says a new report from the National Academies National Research Council. Salmon are at increased risk during periods of low flows and high water temperatures, conditions that are most likely to occur during the summer months when demand for water by farmers is greatest, the report says.
"Whether or not to issue additional permits is a decision to be made by the public and policy-makers, but if the withdrawals are allowed, there should be enough flexibility to halt them if river conditions become too severe for the salmon," said Ernest Smerdon, chair of the committee that wrote the report, and retired vice provost and dean, College of Engineering and Mines, University of Arizona, Tucson.
The report was requested by the Washington State Department of Ecology, which asked for an evaluation of the effects of additional water withdrawals of approximately 250,000 acre-feet to 1.3 million acre-feet per year, roughly the volume sought in currently pending applications for additional water withdrawals. An acre-foot is the quantity of irrigation water that would cover an acre to a depth of one foot -- equal to 325,851 gallons.
Despite government claims, orangutan populations have not increased. Call for better monitoring
06.11.2018 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Increasing frequency of ocean storms could alter kelp forest ecosystems
30.10.2018 | University of Virginia
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
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16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences