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  • ERDC’s biopolymer research group conducts overtopping field study

    The U.S. Army Engineer Research and Development Center (ERDC) is going “over the top” to solve challenges with innovative experiments. Recently, ERDC’s biopolymer research group conducted an overtopping field study of one of their experimental embankments.

  • Potential Engineering With Nature Features to be Incorporated at Woodtick Peninsula

    Purpose: Woodtick Peninsula is a barrier peninsula in western Lake Erie where restoration activities are being planned to combat erosion of the peninsula wetlands through placement of dredged material. As part of the restoration effort, design of an artificial reef is currently underway to function as a breakwater, preventing erosion of the fine-grained material being hydraulically placed along the west side of the peninsula. To the extent possible, it is desirable to design the reef such that it would not only provide erosion protection, but also incorporate features that would provide habitat, and thereby support the goals of Engineering With Nature® (EWN®). EWN is a concept focused on aligning natural and engineering processes to deliver economic, environmental, and social benefits efficiently and sustainably through collaboration. A range of breakwater and shoreline armoring alternatives have been utilized in coastal environments to enhance habitat. While a number of alternatives have been successfully demonstrated in marine waters, fewer structures have been adapted to freshwater systems of the Great Lakes. However, there have been several demonstrations within the Great Lakes in which breakwater structures have been enhanced to incorporate habitat features. In this report, potential designs for breakwaters and shoreline edging in freshwater systems that can incorporate EWN benefits are summarized.

  • USACE Jacksonville District issues scoping letter for the Cape Canaveral Wastewater Treatment Facility in east Brevard County

    The U.S. Army Corps of Engineers, Jacksonville District (USACE) is engaged with the City of Cape Canaveral to develop and construct a project under Section 14 of the Continuing Authorities Program (CAP) to address ongoing erosion at the Cape Canaveral Wastewater Treatment Facility (CCWWTF) in east Brevard County, Florida. The Jacksonville District is currently gathering information to define issues and concerns that will be addressed in an analysis to be prepared in compliance with the National Environmental Policy Act (NEPA).

  • Review of Regressive Channel Erosion and Grade Control Options on the Rio Coca, Ecuador

    Purpose: The US Army Corps of Engineers (USACE) is assisting the Ecuadorian state-run Corporación Eléctrica del Ecuador (CELEC) in addressing a water resource issue involving regressive channel erosion on the Rio Coca. Reconnaissance of the site was completed the week of 21 February 2022; parts of the river system were viewed to determine if improvements could be made to the current grade control structure (GCS) mitigation plan for reducing channel erosion and stabilizing the river system downstream of the Coca Coda Sinclair (CCS) Dam. The Rio Coca is a tributary to the Amazon River system in South America. It originates on the east side of the Andes Mountains and generally flows from southwest to northeast through the project area and then turns and flows east into the Amazon basin (Figure 1).* The Rio Coca valley is a current example of how damaging regressive erosion can be to a fluvial system (Figure 2).

  • Evaluation of a Permeable Dam as an Erosion Control Structure on Coca River, Ecuador

    Abstract: The effort performed here describes the process to evaluate the scour-protection performance of the proposed permeable dam. The US Engineer Research and Development Center, Coastal and Hydraulics Laboratory, built a 1:50 Froude scaled movable bed section model of the permeable dam structure and tested in a specialized flume that simulates regressive erosion propagation. Profiles were collected at various times to track the progression of the scour. Tests evaluated variations of the proposed structure, which included tetrapods, riprap, bridge piers, and longitudinal piles. For the various proposed alternatives, a total of six tests were conducted. The collected profiles show the ability or inability of each alternative and its associated performance. From this analysis, untethered tetrapods could not effectively arrest the local scour around the structure. However, large rock along with invert control stopped the regressive erosion and held the upstream grade.

  • USACE hosts charrette, public scoping meeting for St. Augustine Back Bay CSRM Feasibility Study

    St. Augustine, Fla. – Feb. 24, 2023 -- Jacksonville District’s St. Augustine Back Bay Coastal Storm Risk Management Feasibility Study took two big steps forward when the district and its non-federal sponsor, the City of St. Augustine, began a three-day charrette and held a public meeting to introduce residents to the study’s issues and aims.

  • 23-004 Corps ropes off hillside after erosion event at McNary

    Umatilla, OR – Officials at McNary Lock and Dam have roped off the hillside on the south shore near the dam due to hazardous conditions created by an erosion event.

  • Baseline Data for a Cedar Tree Revetment Monitoring Site near Wichita, Kansas

    Purpose: This US Army Corps of Engineers (USACE) National Regional Sediment Management technical note (RSM-TN) documents baseline data collected at a cedar tree revetment installation on a small creek near Wichita, KS. These data can be used in subsequent years to add to the understanding of the longevity, effectiveness, and failure modes of cedar tree revetments as bank stabilization.

  • Field Jet Erosion Tests on Benbrook Dam, Texas

    Abstract: This report summarizes the results of eight field Jet Erosion Tests (JETs) performed on Benbrook Dam, TX. The results from these tests will be used by the U.S. Army Corps of Engineers, Fort Worth District, in assessments of the erosion resistance of the Benbrook Dam with regards to possible overtopping by extreme flooding. The JETs were performed at four different locations, i.e., two locations at the lowest crest elevation and two locations at the mid-slope face of the downstream embankment. Variations in estimated critical hydraulic shear stress and erosion rate values may have been caused by differences in soil composition, i.e., when the material changed from silt/sand to clay. The resulting values of the Erodibility Coefficient, Kd, and Critical Stress, τc, are very useful information in assessing the stability of Benbrook Dam during an overtopping event. Because of the observed natural variability of the materials, combining the erosion parameters presented in this report with the drilling logs and local geology will be imperative for assessing erosion-related failure modes of Benbrook Dam.

  • Final ribbon-cuttings close out two-day celebration blitz

    To close out the two-day sprint across five states, the Memphis District held two final ribbon-cutting ceremonies on Nov. 18, 2021. Both events celebrated construction projects completed in Arkansas and Missouri.