Mississippi River Diversions for Marsh Creationby Nancy Jeanne Powell, US Army Engineer District, New Orleans, United States,
Abstract: Large scale, uncontrolled sediment diversions from the Mississippi River are proposed by the Corps of Engineers as a means of creating new marsh and reducing the loss of wetlands. These uncontrolled diversions are intended to simulate the natural bifurcations and crevasses of a delta system and would consist of a cut in the bank and a conveyance channel to convey sediment laden water to shallow open water areas. Various combinations of design discharges and sill elevations were evaluated. In order to enhance the development of marsh within the receiving waters, earthen dikes would be constructed to assist in retaining discharged sediment. To assist in extending delta growth, additional bifurcations would be dredged in the new delta.
Subject Headings: Sediment | Rivers and streams | Transportation engineering | Wetlands (coastal) | Sea water | Bifurcations | Water discharge | Spillways | Mississippi River
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