James E. Quarles WTP Reservoir Dam Improvements Client: Cobb County Marietta Water Authority Location: Cobb County, GA Hazen and Sawyer (Hazen) is providing dam rehabilitation design, permitting, and construction services for the James E. Quarles Water Treatment Plant (WTP) Reservoir Dam Improvements project. Upon completion of the initial scope, which included drainage basin analysis, spillway capacity evaluation, eld inspections, and 2D breach modeling, the Cobb County Marietta Water Authority requested that Hazen develop a cost-eective option for rehabilitating the dam.West corner of the reservoir where the ACB auxiliary spillway will be installed. WTP in the background.Northwest side of the dam looking toward the west corner where the ACB auxiliary spillway will be installed. Low-lev

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