Trans-Alaska Pipeline faces increasing threats from floods. Is there a long-term solution? This article was published in partnership with Inside Climate News.
Then, in August, rain gauges registered 171 percent higher precipitation than the 30-year average when the downpours hit the headwaters of the Sagavanirktok. The usual rainfall total for the region is about 3 inches for the month; it more than doubled that fall in 2019.
Such downpours are increasingly being fueled by evaporative moisture from the warming of the Bering Sea, said Rick Thoman, an Alaska climate specialist with the climate assessment center. The added moisture in the atmosphere supercharges the traditional summer storms along the North Slope. In June 2020, Alyeska again found itself where it began in 2019: scrambling to protect a section of pipeline buried 10 feet deep when the Lowe River roared to life and flooded near Valdez, eroding a 100-foot buffer between the riverbank and the pipeline. The company brought in heavy machinery to place up to 2,000 cubic yards of riprap to fortify 300 feet of the eroded bank.
“The program monitors stream crossings and flood plains along the route of the pipeline,” Egan said. “Flow rates and water levels traditionally shift and vary. We collect, store and analyze data for trends to proactively protect the pipeline.”
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