Posted on December 18, 2014 by Bob Berwyn
The Colorado River Delta in May, 2014. Photo courtesy NASA.
Science team tracks effects of historic pulse flow
FRISCO — Last May’s pulse flow in the Colorado River helped revive vegetation along a huge swath of the river’s edge, triggering new plant growth and raising the water table in the delta. After comparing satellite images taken August 2013 with new images from this year, scientists calculated a 23 percent increase in the greenness of riparian zone vegetation. Continue reading
Filed under: Colorado, Environment, rivers, water | Tagged: climate, Colorado River, Colorado River Delta, Colorado River pulse flow, water | 1 Comment »
Posted on December 16, 2014 by Bob Berwyn
Pollution from road salt is increasing quickly, a new USGS study found.
EPA standards for chloride exceeded at one in three sampling sites
FRISCO — Many streams in the northern U.S. are polluted to toxic levels by salt deicers, the U.S. Geological Survey said in a new study that found the frequency of these occurrences nearly doubling in two decades.
Chloride levels increased substantially in 84 percent of the urban streams analyzed, the researchers said, using data going back to 1960 and ending as recently as 2011. Continue reading
Filed under: climate and weather, Environment, rivers, water, water quality | Tagged: chloride pollution, Environment, road salt, transporation | Leave a comment »
Posted on November 20, 2014 by Bob Berwyn
Calcium loss turning lakes to ‘jelly’
Acid rain has fundamentally changed the chemistry and biology of some lakes.
Tiny jelly covered plankton are displacing other organisms in some Canadian lakes to the detriment of fisheries and public water supplies. Photo courtesy Michael Arts, Canada Centre for Inland Waters.
FRISCO — The toxic legacy of acid rain lives on in lakes in Canada, and possibly other places around the world, according scientists who say they’ve traced a trend of reduced calcium levels leading to a “jellification” of some lakes.
Specifically, the changes in water chemistry have reduced populations of calcium-rich plankton such as Daphnia — water fleas that dominate these ecosystems. Falling calcium levels mean Daphnia cannot get the nutrients they need to survive and reproduce, leading to a rise in other plankton species, including small jelly-clad organisms.
According to the new research, populations of those organisms has exploded in lakes across eastern Canada in the past 30 years. The average population of these small invertebrate jellies in many Ontario lakes doubled between the mid-1980s and the mid-2000s. Continue reading
Filed under: Environment, water, water quality | Tagged: acid rain, Canada, Environment, Plankton, water quality | 1 Comment »
Posted on November 12, 2014 by Bob Berwyn
Runoff in North Tenmile Creek, Summit County Colorado.
Rise in groundwater temps reflects surface temperature record
FRISCO — Decades of detailed temperature measurements from around the globe show how the thickening blanket of heat-trapping greenhouse gas pollutants is steadily raising surface and water temperatures, but until recently, there hasn’t been a lot of information about ground water. Now, scientists with ETH Zurich say groundwater temperature profiles echo those of the atmosphere, albeit damped and delayed.
For their study, the researchers used uninterrupted long-term temperature measurements of groundwater flows around the cities of Cologne and Karlsruhe, where the operators of the local waterworks have been measuring the temperature of the groundwater for 40 years. Continue reading
Filed under: climate and weather, Environment, global warming, water | Tagged: climate change, global warming, groundwater | Leave a comment »
Posted on November 9, 2014 by Bob Berwyn
An irrigated hay field in western Colorado.
Per capita water usage drops 11 percent from 2005-2010
FRISCO — A new study by the U.S. Geological Survey shows that overall water use in the U.S. dropped to its lowest level in 45 years. The USGS has tracked national water use since 1950.
The new report shows that total daily withdrawals dropped about 13 percent, from about 410 billion gallons per day in 2005, to 355 billion gallons per day in 2010, mainly from improvements in water-use technologies and management.
“Even as the U.S. population continues to grow, people are learning to be more water conscious and do their part to help sustain the limited freshwater resources in the country,” said Mike Connor, deputy secretary of the Interior. Continue reading
Filed under: agriculture, Environment, water | Tagged: Environment, irrigation public water supplies, per capita water use, USGS, water | Leave a comment »
Posted on October 21, 2014 by Bob Berwyn
Fish-eating ospreys not showing signs of contamination
Ospreys so far are not picking up significant amounts of pharmaceutical pollution found in many streams and rivers around the world. bberwyn photo
FRISCO — Pharmaceutical compounds from makeup and drugs are turning up in streams and rivers all over the world, even in remote Yucatan cenotes, but for now, they don’t seem to be working their way up the food chain.
The chemicals have been finding their way into the environment, primarily through wastewater, urban runoff and even biosolids applied to agricultural lands, but he impact on wildlife is unknown, so researchers with the U.S. Geological Survey and Baylor University teamed up to try and track the pollutants through the food chain by testing ospreys. Continue reading
Filed under: Environment, water, water quality | Tagged: bioaccumulation, Environment, ospreys, pharmaceutical pollutants, water quality, wildlife | Leave a comment »
Posted on October 20, 2014 by Bob Berwyn
All-out remediation effort targets acid mine drainage near Keystone Ski Area
By Bob Berwyn
FRISCO — For decades, the abandoned Pennsylvania Mine has been oozing heavy metals — zinc, manganese, cadmium, lead and and arsenic — into the waters of Peru Creek, a small tributary of the Snake River near Keystone, Colorado. The site has been the focus of intensive study during the past 15 years with the goal of improving water quality downstream.
Last week, engineers and environmental experts took a big step toward trying to staunch that flow by blocking one of the mine tunnels. If all goes well, the new bulkhead could reduce the direct discharge from the mine by about two-thirds, said Jeff Graves, a remediation expert with the Colorado Division of Reclamation Mining and Safety.
Graves explained that the new plug should force the water back into its natural underground pathways, trickling and percolating down through layers of rock and earth, and not as prone to the oxidation that’s key in the formation of acid mine drainage. Essentially, the work will restore the groundwater flow to more natural, pre-mining conditions, he said. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: abandoned mine pollution, acid mine drainage, EPA, Pennsylvania Mine, Peru Creek, Snake River Colorado, Snake River watershed task force | Leave a comment »