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Posts Tagged ‘Sediment’

BY BRIAN BARTH / PHOTOGRAPHY BY JULIE DERMANSKY

In Southern Louisiana, Evans + Lighter Landscape Architecture is helping the people of Isle de Jean Charles move away from a disappearing coast.

Every year LAM honors two articles that stand out in the realm of landscape architecture with the Bradford Williams Medal—one that has appeared in LAM, and one from outside the magazine. After a nomination and selection process by the LAM Editorial Advisory Committee, this year’s 2017 Bradford Williams Medal LAM winner is Brian Barth for his article “Let’s Beat It,” below, which appeared in the October 2016 issue.

Wenceslaus Billiot often spies dolphins leaping in the bay behind his house in Isle de Jean Charles, Louisiana. Just shy of his 90th birthday, he remembers his backyard as a vast, forested wetland when he raised his family here as a young man. In dry weather, the land was firm enough for his kids to walk to the store in the nearby hamlet of Chauvin. This June day the water is calm—a fisherman’s paradise—but hurricane season is another story. Billiot, a World War II veteran, former tugboat captain, and boat builder, says every year the water comes higher.

He lives in a dwindling community of the Biloxi–Chitimacha–Choctaw tribe, and like most of the 27 families who remain, Billiot and his wife, Denecia, are making plans to move inland. “But I don’t want to go,” he says in a Cajun accent.

He has no choice. Isle de Jean Charles, once 22,000 acres, has lost 98 percent of its land area since 1955, and state officials warn that (more…)

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BY TIMOTHY A. SCHULER

Where has all the sediment gone? Image courtesy of Landscape Metrics and the Dredge Research Collaborative.

Where has all the sediment gone? Image courtesy of Landscape Metrics and the Dredge Research Collaborative.

From the December 2016 issue of Landscape Architecture Magazine.

Thanks to a severe shortage of sediment, the tidal marshes of the San Francisco Bay are disappearing, taking with them a vital ecosystem and an important defense against sea-level rise. In response, in June 2016, voters approved a parcel tax that will generate $500 million over the next 20 years for wetland restoration. And yet the sediment hasn’t vanished; it’s a prisoner of the state’s highly altered hydrologic system. “There’s this incredible resource that’s just sitting behind this constellation of dams,” says Landscape Metrics principal Matthew Seibert.

This summer, as a part of DredgeFest California, Seibert worked with the Dredge Research Collaborative and workshop participants to visualize this “hidden sediment reserve.” Based on data published in the journal Water Resources Research in 2009, the team created an interactive map showing where—and when—California’s sediment was diverted, as well as the cost of removing that sediment, which far exceeds the expected $500 million in tax revenue. Seibert is optimistic, however, especially as the economics of climate change become increasingly apparent: “The Baylands have an amazing capacity for flood mitigation that I don’t feel is quantified economically yet, or valued as it should be.”

For an interactive version of this map, visit landscapemetrics.com/dredge.

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The things our art director, Chris McGee, hated to leave out of the current issue of LAM.

Image courtesy of California American Water.

Image courtesy of California American Water.

From “River Reroute” by Lisa Owens Viani in the November 2016 issue; a look at Rana Creek Design’s plans to swap a riverbed for a parallel-running creek so that sediment can be removed from a dam nearing the end of its useful life.

“Busy beavers. . .”

–Chris McGee, LAM Art Director

As always, you can buy this issue of Landscape Architecture Magazine at more than 700 bookstores, including many university stores and independents, as well as at Barnes & Noble. You can also buy single digital issues for only $5.25 at Zinio or order single copies of the print issue from ASLA. Annual subscriptions for LAM are a thrifty $59 for print and $44.25 for digital. Our subscription page has more information on subscription options.

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