FRISCO — Federal scientists said they’ve developed ways to detect invasive quagga and zebra mussels while they’re still in the larval stage. That could help resource managers beef up protective measures before the mussels establish themselves in reservoirs and lakes.
FRISCO — Since the 1980s, warmer spring temperatures in the Rocky Mountain region have been melting the snowpack earlier, with increasing temperatures tabbed as the main factor in the decline, according to the U.S. Geological Survey.
The agency carefully tracks streamflows and snowpack measurements, with decades of data now showing clear trends toward shorter winters, earlier spring runoff and an overall 20 percent shrinkage of the snowpack in the mountains of the western U.S.
The researchers say at least part of the changes are due to global warming caused by heat-trapping greenhouse gases, but that natural variability is also a factor. Regardless of the exact cause, the snowpack decline is already causing major headaches for water managers in the region facing dwindling supplies and increased demand.
Federal water agency says it will cut deliveries from Lake Powell next year
By Bob Berwyn
FRISCO — Colorado River water supplies are already stretched dangerously thin, and the faucet is about to get turned down, as federal water managers said they will probably have to curtail downstream deliveries from Lake Powell in 2014.
FRISCO — The Colorado River took center stage in Congress for a few hours this week, as the Senate Subcommittee on Water and Power focused on a recent Colorado River study that predicts a growing gap between what the demand for water and what the river can deliver.
The hearing was chaired Sen. Mark Udall, a Colorado Democrat, who knows first-hand what is at stake, from the headwaters in the mighty Rockies down to the Gulf of California. Business as usual just won’t cut it, Udall said, advocating for a short-term focus on conservation, innovation and better management of supply. A video of the hearing, as well as the written testimony of the witnesses, is online here.Continue reading “Hearing shines spotlight on Colorado River woes”→
FRISCO — Water managers in the Southwest are considering all sorts of options to address what is expected to become a huge shortage of water in the Colorado River Basin. But one path they haven’t explored in detail is a fundamental re-allocation of water between the Upper Basin and Lower Basin states.
“Slight improvement in the Colorado basin water supply is like expecting a road-killed jackrabbit to feed a whole pack of hungry coyotes. It’s not nearly enough to go around. ~USDA hydrologist Randall Julander
By Bob Berwyn
FRISCO — With May inflow into Lake Powell less than half the long-term average, the U.S. Bureau of Reclamation is projecting that total reservoir storage in the Colorado River Basin will dip to about 29.3 million acre feet. That’s just 49 percent of storage capacity and the lowest level since the peak of the early 2000s drought, when the 2005 water year started with storage at 29.8 million acre feet (50 percent of capacity). More Lake Powell water info here: http://lakepowell.water-data.com/.
May’s inflow into Lake Powell was 1,121 thousand acre-feet, about 48 percent of average — a stark reminder that winter and spring precipitation was well below average in large parts of the Colorado River Basin, despite a surge of late-season moisture in the headwaters region of north-central Colorado. But at least the May inflow was an improvement from April, when inflow was only about a third of average.
After releasing about 602,000 acre-feet downstream, Lake Powell’s elevation at the end of May was at about 3,599 feet, which is about 100 feet below full. According to BuRec, the reservoir elevation is expected to remain within several feet of the current elevation throughout spring and summer as inflow from runoff roughly matches reservoir releases. In late summer, the reservoir elevation will begin to decline again.
For the April to July runoff season, water managers are now projecint that total inflow will be about 3 million acre feet, which is about 42 percent of the average inflow for the 1981 to 2010 period, with the overall water supply outlook remaining significantly below average. Lake Powell will probably end the current water year at just 44 percent of capacity.
The past decade has seen significant variability in precipitation totals, with near record runoff in 2011, followed by two of the driest years on record.
Projected water shortages spur more conservation and collaboration
By Bob Berwyn
FRISCO — Federal agencies say they will try to offer leadership, technical expertise and — perhaps most importantly — money, as southwestern states grapple with what could be significant water shortages in the Colorado River Basin during the coming decades.
At a major water powwow in California this week, all the major stakeholders in the Colorado River Basin said they’re ready to work together to find a long-term, systematic solution to the potential long-term imbalance between the Colorado River’s future supply and projected demands.