Dams / Reservoirs

  • InfrastructureWater reservoirs for hydroelectric dams are sources of greenhouse gas emissions

    The large reservoirs of water behind the world’s 50,000 large dams are a known source of methane. Like carbon dioxide, methane is one of the greenhouse gases which trap heat near Earth’s surface and contribute to global warming.  Methane, however, has a warming effect twenty-five times more powerful than carbon dioxide. The methane comes from organic matter in the sediments that accumulate behind dams.

  • WaterDams play an important role in water pollution control

    Small dams, reservoirs and ponds trap water pollution, which provides an important benefit to water resources. This is especially relevant in agricultural lands of the Midwest U.S., where there are lots of small, but aging, dams.

  • Louisiana floodsChanges to levee system would reduce storm surge risks to New Orleans: study

    Historically, the design of Southeast Louisiana’s hurricane flood risk reduction system has hinged on raising and adding levees in response to river or hurricane events that impact the region. A new study shows that the lowering of man-made levees along 55-kilometer section of the west bank of the Lower Plaquemines river to their natural state, to allow storm surge to partially pass across the Mississippi River, will decrease storm surge upriver toward New Orleans.

  • WaterChina’s Mekong River dams undermine neighbors’ economies, food production

    Five Chinese dams on the Mekong River’s upper portions have caused rapid changes in water level, and other adverse effects, downstream, especially in Vietnam, Cambodia, Thailand, and Laos, where millions of people rely on the river for water, food, and transportation

  • InfrastructureDutch test-levee experiment helps strengthen U.S. levees, dams

    In the United States, the national flood-control infrastructure is aging and its structural health is deteriorating; the system comprises more than 5,600 km of levees, and 43 percent of the U.S. population lives in counties with levees designed to provide some level of protection from flooding; some of these levees are as old as 150 years; in 2009, the American Society of Civil Engineers Report Card for America’s Infrastructure gave the condition of the nation’s dams a grade of D, and levees a grade of D-minus; an dam-strength experiment in the Netherland helps engineers collect data to validate new suite of technologies for assessing the health of levees and dams

  • Infrastructure protectionNew earthquake assessment finds increased risk for Washington Dams

    Central Washington state has always been considered low risk for earthquakes back when big hydropower dams went up on the Columbia River many decades ago; a recently completed seismic hazard assessment, however, shows that there is a much greater earthquake potential for the area than previously thought; now, dam owners have to figure out whether their dams can hold up to an earthquake; if retrofits are needed, they could cost hundreds of millions of dollars

  • Infrastructure protectionLocal officials oppose “unacceptable” levee ratings

    In recent years as part of an effort to bolster the nation’s flood protection infrastructure, the Army Corps of Engineers has analyzed and declared more than 200 levee systems across the country as “unacceptable,” resulting in a firestorm of criticism from local officials

  • Infrastructure protectionCyber attacks on U.S. are becoming more lethal

    The head of the U.S. Cyber Command said that cyber attacks on the United States are escalating from large-scale theft and disruption of computer operations to more lethal attacks that destroy systems and physical equipment

  • Infrastructure protectionVirginia quake highlights overlooked danger: decrepit dams

    Tuesday’s Virginia earthquake raised fears that a Fukushima scenario would unfold somewhere on the East Coast, but experts say that earthquake pose a much greater threat: breaching decrepit dams; of the 85,000 dams in the United States, 4,000 are seriously unsafe or deficient — and of those, 1,800 are located in areas where a breach would cause grave damage to life and property

  • InfrastructureChina admits to critical flaws at world’s largest dam

    Last week, the Chinese government made a rare announcement and publicly admitted that there were critical problems at the Three Gorges dam, the world’s largest hydroelectric dam, lending support to the growing opposition to future dam projects; with the approval of Chinese Premier Wen Jiabao, the country’s second in command, last Thursday the State Council announced that the Three Gorges dam had been plagued by a series of problems “urgently in need of resolution”; problems include ecological deterioration, geological disasters, and the lingering uncertain status of more than one million people displaced by the dam; this is the first time such a high-ranking government official has publicly acknowledged the dam’s problems

  • DisastersHistoric, desperate measures to control Mississippi River

    The historic levels of water swelling the Mississippi River required the Army Corps of Engineers to take historic measures to prevent catastrophic flooding of Baton Rough and News Orleans: first, the Morganza control structure, located 186 miles upriver of New Orleans and completed in 1954 as part of the Army Corps of Engineers’ broad flood-protection upgrades in the wake of the Great Flood of 1927, was opened for only the second time to allow water to flow out of the river and into the Atchafalaya basin, a designated flood relief area; the Corps says that Saturday marked the first time in history that all three floodways built by corps after 1927 flood — the Morganza Floodway, the Bonnet Carre Spillway, and the Birds Point floodway in Missouri — have been in operation at the same time; about 25,000 people and 11,000 structures are in harm’s way, as up to 25 feet of flooding is expected in a 3,000 square-mile area of Louisiana

  • DisastersNew Orleans debates hurricane protection plans

    The Army Corps of Engineers is currently deciding how best to implement its $2.9 billion Mississippi River-Gulf Outlet (MR-GO) restoration plan in New Orleans; the plan is part of several projects designed to protect the Louisiana coast line from hurricane storm surges; residents are clashing over the plan and the public hearing period for the plan has been extended; state legislators are currently debating with the corps, as the $2.9 billion project funds do not include the costs for land acquisition, design, and operation and maintenance; the project is expected to take ten years to complete and construction could begin as early as 2012

  • The water we drinkExpert urges broad reforms in managing California's water

    Most threatening to California’s water situation is the vulnerability of the hub of the state’s fresh water system, the Sacramento-San Joaquin delta, which drains water from the northern Sierra mountains; over the past century, farmers have built a network of more than 1,700 kilometers of levees to protect farmland in the delta from floodwaters; those levees are weak and vulnerable to earthquakes, seasonal floods, and rising waters expected as a result of climate change; the failure of even a fraction of the levees would draw massive amounts of saltwater in from San Francisco Bay, forcing the state to shut off the pumps, cutting off water supplies for many months, and costing the state’s economy billions of dollars

  • InfrastructureDanger building up behind aging, vulnerable dams

    Of the U.S. 85,000 dams, more than 4,400 are considered susceptible to failure; a 2009 report put the cost of fixing the most critical dams — where failure could cause loss of life — at $16 billion over twelve years, with the total cost of rehabilitating all dams at $51 billion; those figures do not include dams among the approximately 3,000 that are owned by the federal government; the Army Corps of Engineers, for example, says that more than 300 of the roughly 700 dams it is responsible for need safety-related repairs, and estimates the total fix-up bill at about $20 billion

  • InfrastructureCalifornia Delta plan released, canal recommendation missing

    Last week the Delta Stewardship Council released the first draft of its proposed plan to resolve safety concerns over California’s Sacramento-San Joaquin River Delta, one of the state’s most critical pieces of infrastructure; the Delta accounts for 76 percent of the state’s fresh water supply; engineers, residents, and politicians fear that the aging levees along the Delta will break in the event of an earthquake; missing from the initial draft is a recommendation for a peripheral canal, a controversial proposal that has sparked fierce debate; more details will be added to the plan in subsequent drafts after public meetings are held to debate its contents; the final draft of the plan is scheduled to be completed and adopted in November 2011