R2T was subcontracted as part of the City of Atlanta Water Supply Program design team to support infrastructure upgrades to convert the Bellwood Quarry into a raw water storage facility. The program entails a 10-foot diameter tunnel to convey water from the Chattahoochee River to the new reservoir with shafts and pump stations to deliver flows to two water treatment plants. R2T developed an alternative phased approach that allowed the City to extend the tunnel by approximately 4-miles and complete upgrades at the raw water pump station at a much-reduced cost by maximizing value of equipment, mobilization, and eliminating many obligations of the initial phasing plan.
R2T completed reviews of water quality modeling, studies to provide insight into the operational mode of the water, and developed design documents that utilized hydraulic similitude testing, in cooperation with the Clemson University Hydraulic Testing Facility. This review resulted in a compact footprint for the various shafts, wet wells for the multiple pump selection and types and developed and evaluated alternate pump configurations, and conducted workshops with the owner’s staff to finalize pump type and configuration. R2T staff led and completed detailed design of 120 MGD raw water intake, screen and vertical turbine pump station at the Chattahoochee River.
Our team expedited delivery of the detailed design after field investigations required modification to the original plan due to condition of existing valves and isolation facilities. We developed Innovative Solutions that allowed implementation/design and a construction scheme that resulted in significant increase in value provided to DWM by doubling the length of the excavated tunnel at minimal increase to the cost, streamlined phasing of the project, maximized value of the tunnel boring machine, and allowed DWM to proceed with the project without reducing any of the critical design criteria.