Our Fragile Infrastructure: Lessons From Hurricane Helene
Buncombe County North Carolina – damage after Hurricane Helene floods. NCDOTcommunications, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons
Asheville, North Carolina, is known for its historic architecture, vibrant arts scene and as a gateway to the Blue Ridge Mountains. It was a favorite escape for “climate migrants” moving from California, Arizona, and other climate-challenged vicinities, until a “500 year flood” ravaged the city this fall.
Hurricane Helene was a wakeup call not just for stricken North Carolina residents but for people across the country following their tragic stories in the media and in the podcasts now favored by young voters for news. “Preppers” well equipped with supplies watched in helpless disbelief as homes washed away in a wall of water and mud, taking emergency supplies in the storm. Streets turned into rivers, and many businesses and homes suffered extensive water damage if they were not lost altogether.
The raging floods were triggered by unprecedented rainfall and winds, but a network of fragile dams also played a role. On Sept 27, when the floods hit, evacuation orders were issued to residents near a number of critical dams due to their reported “imminent failure” or “catastrophic collapse.” Flood waters were overtopping the dams to the point that in some cases the top of the dam structure could not be seen.
The dams did not collapse, but to avoid that catastrophe, floodgates and spillways had to be opened, releasing huge amounts of water over a number of days. Spokesmen said the dams had “performed as designed,” but they were designed for an earlier era with more stable, predictable climates and no population buildup below the dams.
Five days after the floods hit in East Tennessee, half a million gallons of water were still being released per second from Douglas Dam, northwest of Asheville and upstream from Knoxville on the French Broad River. (Video clip of opened floodgates.) The Watauga Dam in Tennessee was also releasing record flows, surrounding nearby homes in water. WTVC NewsChannel 9 Chattanooga reported that Chickamauga Dam, upstream from Chattanooga, released approximately 566,118 gallons of water per second.
The Nolichucky Dam, in Tennessee near the North Carolina border, was reported to have “withstood nearly twice the water flow of Niagara Falls.” (See dramatic videos on Fox Weather showing the overflow and the floodgate release continuing three weeks later, a similar clip from 11Alive adding the damage downstream, and overflow footage on WKYC Charlotte.) Other major dams in which the floodgates were opened included Cowans Ford Dam, north of Charlotte (see video clip of the floodgate release); and Waterville Dam (also called Walters Dam), upstream from Newport in Tennessee (video). Homeowners accused Duke Energy of sacrificing poor neighborhoods for wealthier properties, but as one official said, the excess water had to go somewhere. It had to go downstream. They did what they had to do to avoid outright collapse of the dams, a much worse disaster.
Upriver from Asheville, the auxiliary spillway of the North Forks Dam was activated. It too is said to have “performed as designed,” but the result was again significant flooding. Mandatory evacuation orders were put in place from the dam to Biltmore Village in Asheville, which suffered major damage. North Forks Dam is classified as a ”high-hazard potential dam,” meaning its failure could result in potential loss of life and serious property damage.
One concerned Asheville podcaster complained that the city had known for 20 years that the North Forks Dam was inadequate and a lethal danger under flood conditions, but it hadn’t been repaired. The dam was put to the test in September, when residents were told there was no choice but for the flood gates to be opened to prevent the dam from breaking. The result was a 30 foot wall of water that swept homes and lives away, rushing so fast that people were found in the tops of trees. The podcaster’s suspicions were aroused because lithium worth billions of dollars is located in Western North Carolina, where a mining company has been trying to restart operations since 2021, over community protests.
That was also true of the nearby town of Spruce Pine, downstream from the North Toe Dam, which was submerged under eight feet of water from the combination of torrential rain and the release of the dam’s floodgates. Spruce Pine is a major producer of high-quality quartz, a rare but necessary resource for many tech products. Mining companies have been attempting to double their operations in Spruce Pine, but they too have met resistance from local landowners. For some controversial details, see here.
Asheville is also downstream from Lake Lure Dam, which was reported on Sept. 27 to be “at risk of imminent failure” as the river was overtopping the dam. Most heavily affected was Chimney Rock, the town immediately downstream from Lake Lure, known for both its rustic scenery and its lithium mines. The damage was extensive.
According to an Oct. 2 broadcast on WBTV News in Charlotte titled “Lake Lure Dam ‘high hazard’ and needed repairs at time Helene hit,” the dam, completed in 1926, does not meet current state safety requirements. Repairs were ongoing but unfinished. Lake Lure Dam is one of 1,581 dams across the state considered “high hazard,” and according to a 2022 report, North Carolina has 194 high-hazard dams in poor or unsatisfactory condition, meaning they “may require immediate or emergency remedial action.”
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