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City of Atlanta Raw Water Delivery System

Providing water sustainability for the next 100 years

Atlanta, Georgia

We are designing the underground aspects of the City of Atlanta's top priority infrastructure project – the Raw Water Supply System. Current infrastructure consists of components dating back to the 1890s, with critical portions well beyond their design life. The new system moves raw water from the Chattahoochee River to a quarry and the Hemphill and Chattahoochee water treatment plants to provide water sustainability for over 100 years.

The project consists of 5 miles of 10-foot diameter tunnel in hard and abrasive Gneiss bedrock, use of a 2.4 billion gallon quarry for raw water storage (one of the largest in the world), 10 shafts, raw water intake, pump station retrofit, and three new pump stations. The tunnel varies in depth from 250 feet to almost 500 feet.

Project challenges include mining near the river, mining under existing unlined raw water reservoirs, the Brevard Fault system, inability to shutdown treatment facilities, and construction near residences. Our risk management program uses contract risk management tools, a living risk register, and project specific subsurface investigations. We are also designing an energy recover system with power generating turbines in the drop shaft and specifying green construction methods in all above grade structures.

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