Supporters of Louisianaâs largest coastal project welcome the findings in a new federal report Draft Environmental Impact Statement examines proposed $2 billion sediment diversion Supporters of Louisianaâs largest coastal project welcome the findings in a new federal report By John Snell | March 5, 2021 at 5:53 PM CST - Updated March 5 at 5:53 PM NEW ORLEANS (WVUE) - The largest coast restoration project in U.S. history, the Mid-Barataria Sediment Diversion, reached a milestone with the publishing of a required federal environmental study. The Draft Environmental Impact Statement finds that, at its peak in the year 2050, the project would have built or sustained 28 square miles of marsh in Barataria Bay.