Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: 10/18/2000
Publication Date: N/A
Technical Abstract: In 1983, the United States Congress passed Public Law 98-8 authorizing the Demonstration Erosion Control (DEC) Project within the Yazoo River Basin of Mississippi. The DEC project was to demonstrate, on a watershed basis, methods of reducing flooding, erosion, and sedimentation targeted at 15 watersheds of the Yazoo River basin. DEC watersheds contain incised channels caused by inadequate watershed management practices and channelization. The project contains two objectives, with the first to provide for construction and installation of erosion control measures, and the second to research, monitor, and evaluate the performance of the control measures. The DEC project is a cooperative effort by the US Army corps of Engineers - Vicksburg District, USDA-NRCS, USDA-ARS-National Sedimentation Laboratory, USA COE Waterways Experiment Station, and the USGS - MS District. DEC structures that have been constructed or planned by the various agencies include 2,300 grade control structures, which includes low and high drop structures and drop pipes, 72 flood water retarding structures, 200 debris basins, 5.7 miles of levees, and 310 miles of bank stabilization. Information has been collected concerning conditions in the streams before, during, and after construction of DEC structures. This includes runoff, sediment, geomorphological, ecological, climatological, and landscape information. Notable advances in land treatment and soil erosion conservation practices, stable channel assessment, streambank erosion, stream habitat restoration, physical and computational modeling of rivers and watersheds, sediment transport mechanics, and grade control design have resulted from the DEC project.