Freese and Nichols performed final design and construction support for the Dry Comal Creek Flood Retarding Structure, a new roller-compacted concrete (RCC) gravity dam designed to reduce flooding in Comal County, Texas.
The dam is designed to detain the 100-year flood event, and storm events greater than the 100-year will engage the overflow spillway. The project included extensive geologic evaluations, geotechnical explorations, field testing and advanced seepage analysis due to the highly-variable, karst limestone foundation. The design included a deep cut-off wall to control seepage through the highly permeable foundation and to limit uplift pressures. During final design, Freese and Nichols performed hydraulic and hydrologic, geotechnical, stability, structural, and thermal analyses. Our team developed the construction plans and specifications, construction cost estimate, and coordinated the bid phase. We provided project communications with the state dam safety and all regulatory agencies involved in the project permits and funding.
Freese and Nichols provided construction management services for the deep cut-off wall and RCC dam construction phases. The design and construction phases for the project were fast-tracked to accommodate key milestones associated with federal funding for the project. The project required that final design of the dam and construction of the $4.8-million deep cut-off wall be performed simultaneously to accommodate the deadlines. Immediately following completion of the deep cutoff wall in November 2011, construction on the RCC dam began and required double-shifts to accommodate the funding milestone. The construction of the $12.7-million RCC dam was completed in December 2012.
Water Districts/River Authorities, Municipal
Construction Services, Dams and Levees, Structural