Tag Archive for: Dams

America Thrived by Choking Its Rivers with Dams. Now It’s Time to Undo the Damage.

/in , /by /Popular Scienceby Kate Morgan

Across the nation, the scenario repeats. Atlantic sturgeon, once a hallmark of the eastern seaboard, can reach only about half of their historic spawning grounds. Some 40 percent of the 800 or so varieties of freshwater fish in the US, and more than two-thirds of native mussels, are rare or endangered, in part because man-made barriers have altered their ecosystems. Reservoirs disrupt currents, altering water’s velocity and temperature. That can harm its quality and interrupt the reproductive cycles of aquatic creatures. Stanching a river stops the distribution of sediment and the formation of logjams, two things critical to creating healthy habitat. It also eliminates floodplains and natural meanders, both of which prevent the banks from overflowing.

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Opinion: The Dam Truth About the Colorado River

/in , /by /The Salt Lake Tribuneby Gary Wockner

The latest research about the Colorado River is alarming and also predictable: In a warming world, snowmelt has been decreasing while evaporation of reservoirs is increasing. Yet no politician has a plan to save the diminishing Colorado River. If you followed the news about the Colorado River for the last year, however, you’d think that a political avalanche had swept down from Colorado’s snow-capped peaks and covered the Southwest with a blanket of “collaboration” and “river protection.”

I won’t call it fake news, but I will point out errors of omission. First, the Colorado River is not protected. The agreement that was reached — called the “Drought Contingency Plan” — does not protect the river nor its ecological health. The agreement protects the federal government’s, the states’, the cities’, and the farmers’ ability to 100% drain the river bone dry every single year.

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Most Major California Dams Lack Emergency Plans. ‘High-Risk Issue,’ State Auditor Says

/in , /by /The Sacramento Beeby Dale Kasler

The vast majority of California’s major dams aren’t adequately prepared for an emergency.

Three years after the near-disaster at Oroville Dam, only 22 state-regulated dams have finalized emergency plans — out of 650 major dams that are required by law to have plans in place — according to a report issued Thursday by State Auditor Elaine Howle.

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Can a New Approach to Managing California Reservoirs Save Water and Still Protect Against Floods?

/in , , /by /Water Education Foundation (Sacramento)by Gary Pitzer

Many of California’s watersheds are notoriously flashy – swerving from below-average flows to jarring flood conditions in quick order. The state needs all the water it can get from storms, but current flood management guidelines require reservoirs to dump water each winter to make space for flood flows that may not come. However, new tools and operating methods could lead the way to a redefined system that improves both water supply and flood protection capabilities.

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The Fault Line And The Dams

/in , , /by /East Bay Express (Oakland, Calif.)by Erin Banks Rusby

The earthquakes that rocked Kern County in early July are a potent reminder of the East Bay’s own seismic risk. Last year, the U.S. Geological Survey imagined what could happen during a 7.0 quake on the Hayward Fault, which stretches 74 miles from north San Pablo Bay past San Jose. This so-called “HayWired Scenario” envisioned 800 people dying, 18,000 more being injured, and widespread damage occurring to property and infrastructure. The study also predicted that the surface of the earth would rupture in places “where the fault is currently creeping.” Some fault lines, which mark the edge of plates in the earth’s crust, only move during earthquakes.

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The Dam Truth: The 91,000 Dams In the US Earned A “D” For Safety

/in , /by /Mother Jones ( San Francisco )by Jacques Leslie

It is a telling illustration of the precarious state of United States dams that the near-collapse in February 2017 of Oroville Dam, the nation’s tallest, occurred in California, considered one of the nation’s leading states in dam safety management.

The Oroville incident forced the evacuation of nearly 190,000 people and cost the state $1.1 billion in repairs. It took its place as a seminal event in the history of US dam safety, ranking just below the failures in the 1970s of two dams—Teton Dam in Idaho and Kelly Barnes in Georgia—that killed 14 and 39 people, respectively, and ushered in the modern dam safety era.

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Five Most Fascinating L.A. Dams, Where Disasters Struck And Catastrophes Were Averted

/in , /by /KCETby Sandi Hemmerlein

In the late 19th and early 20th centuries, there was one surefire way for man to conquer nature in Southern California. Build a dam. With dams, water agencies could control the flow of raging rivers, stockpile emergency water supplies and even create giant lakes out of natural dry (or mildly soggy) basins. But the water that was supposed to be held and controlled sometimes overcame some of these great civil engineering feats. And so, many of the stories of the Los Angeles Basin’s tragedy and triumph can be told through the histories of its dams – those that still exist and those that have been lost to failure.

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OPINION: Coalition Of Agencies, Environmentalists Sees Future For Aging Dam

/in , /by /San Francisco Chronicle

While California contemplates new dams for its thirsty future, it’s also thinking about taking out old ones. Along with advancing plans to demolish three dams atop the Klamath River, there’s a movement to rethink and possibly take out a water and power dam in the Mendocino County back country. Pacific Gas and Electric Co. is walking away from the Potter Valley project and Scott Dam, built east of Ukiah in 1922. A new federal license will be costly and the utility has plenty to do working its way out of wildfire-caused bankruptcy. What’s coming next is intriguing: A coalition of local agencies and a dedicated fishing group, California Trout, are talking up a takeover of the dam.

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No Earthquake Damage To Dams

/in , , /by /Kern Valley Sun (Lake Isabella, Calif.)by Kathe Malouf

Shortly after two major earthquakes rocked buildings and rattled nerves in the Kern River Valley earlier this month, U.S. Army Corps of Engineer officials reported that it was “business as usual” at Isabella Dam, stating that the 6.4 magnitude earthquake on July 4 and 7.1 magnitude earthquake on July 5 did not cause any structural damage or safety concerns. Safety inspections on Isabella Dam were conducted immediately following the two earthquakes that were both centered outside of Ridgecrest with the use of both digital technology and on-the-ground inspections. Due to the ongoing construction that has been underway for the past three years at Isabella, Corps officials have been monitoring both Main and Auxiliary dams for seismic activity on a regular basis.

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In an Era of Extreme Weather, Concerns Grow Over Dam Safety

/in , , /by /Yale Environment 360 (New Haven, CT)by Jacques Leslie

It is a telling illustration of the precarious state of United States dams that the near-collapse in February 2017 of Oroville Dam, the nation’s tallest, occurred in California, considered one of the nation’s leading states in dam safety management.

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