Woodlawn Tie Stormwater Drainage Repair & Stream Stabilization
S&ME was contracted by Duke Energy to provide solutions for the long-term stabilization of two segments of eroding streambank located adjacent to one of their existing substations and transmission towers and stormwater repairs within the substation in an urbanized portion of Charlotte. The stream had eroded and become incised to the point where it posed a significant threat to the integrity of the adjacent infrastructure.
S&ME personnel first conducted geomorphic and hydraulic assessments of the stream and affected areas. A limited geotechnical investigation of the streambank area was also performed. Following the assessments, S&ME evaluated multiple bank stabilization concepts. Through collaboration with Duke, S&ME selected a conceptual design that would protect the adjacent infrastructure while minimizing impacts to the stream. Due to the importance of the Duke facilities, the nature of the eroded streambank and the limited space between the streambank and the infrastructure, it was determined that bank stabilization would be best accomplished through the construction of a “Redi-Rock” retaining wall. S&ME provided H&H support for the stabilization and H&H modeling of the substation to evaluate the existing drainage system and provide upgrade recommendations.
S&ME prepared an Erosion and Sediment Control Plan and secured the necessary US Army Corps of Engineers and NC Division of Water Resources permits. Construction of the project is currently underway. In addition, S&ME permitted stream buffer mitigation with the City of Charlotte.