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2005 Honor Award for ENGINEERING EXCELLENCE
Presented by the American Council of Engineering Companies of Georgia
Scott Candler Reservoir in Doraville, Georgia
Services
Design team member responsible for pumping stations, flow control structures, raw water piping, hydraulic analyses, control systems, and construction administration.
Construction Cost
$45 million
Commencement
May 1, 2001 |
Substantial Completion
October 29, 2004 |
Original Storage Capacity
250 Million Gallons (approx.) |
Final Storage Capacity
1 Billion Gallons (approx.) |
Water Surface Area (at Normal Pool)
110-acres (approx.) |
Peeler Road Linear Park
3,200 Feet Long (approx.) |
Design Data
- Depth of each Reservoir = 35 Feet
- Maximum Embarkment Height = 90 Feet
- Over 2.5 Million Cubic Yards of Earthwork
- Nine (9) 50 MGD Submersible Pumps
- Over 10,000 Feet of Large Diameter Pipes (48 Inch to 108 Inch)
- State of the Art Seepage Collection Systems
Challenge
DeKalb County desired to increase raw water storage capacity at their primary filter facility, the Scott Candler Filter Plant, to meet county growth and development projections far into the future and protect customers from potential drought conditions and other service interruptions. This expansion presented significant challenges including:
- Allowable raw water supply interruptions to the existing reservoirs would be minimal and heavily dependant on unpredictable weather conditions.
- Raw water supply to the filter plant could not be interrupted.
- Effects of raising the reservoir normal and high pool elevations on the existing river intake raw water pumping system capacity were unknown.
- New filter plant design and construction would overlap and follow the reservoir expansion, creating multiple interim conditions and require phased completion schedules.
Solution
Prime Engineering, Inc. in association with Golder Associates and Khafra Engineering carefully studied existing piping and flow control systems and filter plant head requirements prior to developing an expansion raw water process phasing plan that allowed uninterrupted service to DeKalb's customers. A system of flow control structures and pipe capacity were developed to allow gravity flow to the plant in normal operating conditions, with three (3) 100 MGD pumping stations to be utilized in drought conditions.
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