|Demonstration Erosion Control Project|
The Demonstration Erosion Control Project (DEC) addressed problems associated with watershed erosion, sedimentation, flooding, and environmental degradation. Initiated by the federal government in 1984, DEC activities were targeted at 17 watersheds comprising 7,600 sq. km within the Yazoo River Basin of northwest Mississippi. These watersheds had suspended sediment yields about three to six times greater than the national average for similar-sized watersheds.
DEC watersheds were plagued with accelerated channel erosion caused by poor watershed management practices and channelization. Stream channels tended to deepen as small waterfalls or knickpoints migrated upstream from the mouths of the larger channels to the upstream end of even the tiniest tributaries. After channel depth exceeded a critical threshold, explosive widening often occurred. Erosion, sedimentation, and changes in streamflow patterns associated with channel incision degrade and destroy fish and wildlife habitats. The DEC project has been renamed the Mississippi Delta Headwaters Project.
DEC is conducted through cooperative efforts of several agencies and institutions.
Stream corridors respond to inputs of runoff and sediment from upland areas as well as to conditions in the channels themselves. Accordingly a systematic approach is required to diagnose and treat problems associated with watershed degradation due to channel incision. 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 structure design have resulted from NSL research sponsored by DEC.
Completed DEC structures include (approximate)
Contacts of DEC - Technology Transfer Activities
DEC -developed technology is available for transfer to other agencies and institutions in the United States and around the world to address watershed and channel erosion problems as well as enhance the conservation of natural resources.