Natural Remediation of An Anthropogenic Sedimentation Event, Multi-Purpose Range Complex-Heavy (MPRC-H), Camp Shelby Training Site, Mississippi

Located within the Desoto National Forest and Camp Shelby Training Site in Perry County, Mississippi, the Multi-Purpose Range Complex-Heavy (MPRC-H) is a training range used by armored and mechanized infantry and attack helicopter units. Recently, two areas immediately outside the MPRC-H and within the Davis Creek Basin were impacted by a large anthropogenic sedimentation event, covering 42.5 acres of wetland with sediment, ranging in thickness from 6 to 14 inches. In addition, 30 un-permitted wetlands were adversely affected. The problem arose during construction of the MPRC-H in late 2004. Lack of adequate sediment control structures (sediment fences and matting) combined with high rainfall lead to mass erosion of sediment into the Davis Creek Basin, Popular Creek Basin and Dry Prong Creek.

In response, proper sediment control structures have been installed and have been successful in keeping subsequent erosion to a minimum. Ongoing field and mapping studies reveal that the natural processes of sedimentation due to local precipitation combined with the discharge of the Davis Creek Tributary have led to natural remediation of most of the sediment-covered wetlands. Understanding the processes that have taken place in and around the MPRC-H should form a template for future sites to determine whether anthropogenic remediation or naturally remediation is a more cost-effective and beneficial approach.