Environmental and Hydraulic Design Issues for the City of Dalton's Water Storage Reservoir
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Golder Associates Inc. was retained by the City of Dalton to provide engineering services for the design and construction of a 1,100 million gallon off-stream storage water reservoir. The design of the reservoir incorporates a blend of environmental, wetlands, and hydraulic issues. The proposed reservoir is located adjacent to the Conasauga River, approximately 10 miles upstream of the City of Dalton's water treatment facilities. The reservoir is the second of a series of reservoirs to be constructed for Dalton Utilities to supplement the city's public and industrial water supply. An additional off-stream reservoir, the Conasauga Reservoir, is located approximately 6 miles downstream of the proposed reservoir. The Conasauga Reservoir was constructed in 1990 and has a maximum storage capacity of 500 million gallons. During seasonal high flows of the Conasauga River, water will be pumped into the reservoir. During seasonal low flows, or at other times as needed, water from the reservoir will be released back into the river to augment flow to the water treatment plant. Environmental design concerns include (1) impacts on aquatic life in the river, including two federally endangered fish species, the amber darter (Percina antesella) and the Conasauga log perch (Percina jenkinsi); and (2) creation of wetlands habitat within the proposed borrow area between the reservoir and the river. The two objectives of the hydraulic design were to re-route surficial drainage at the project site and to reduce impacts on the river flow during flood events.