Pump Station 060 Replacement - How Varying Upstream Conditions Affect Pump Station Design

Authors:

  • Leon Fanning - Hazen and Sawyer

This presentation will discuss the background and design of Berkeley County Water and Sanitation’s (BCWS) Pump Station 060 Replacement project, specifically on varying influent conditions and upstream development encountered during the design process. The purpose of this presentation will be to highlight the design considerations for a pump station when influent conditions vary after design begins, including but not limited to the impacts on wetwell capacity, pump sizing and configuration, and flexibility within the system.

Pump Station 060 (PS060) received flow from two subdivisions, Sangaree and Tramway, as well as upstream Pump Station 061 (PS061). Flow is ultimately conveyed to the Lower Berkeley Wastewater Treatment Facility. The PS060 replacement pump station will receive flow from the same sources as well as a new subdivision, Nexton, and the projected increase in flow for the station’s tributary area for projected development over a twenty-five year period.

During the preliminary design, it was determined that build-out flows for PS061 would not reach the anticipated build-out flows presented in BCWS’s Master Plan, therefore the firm capacity for PS061 could be reduced, thereby reducing the required firm capacity for the PS060 replacement pump station. As the design progressed beyond a sixty percent (60%) level, a new industry, Volvo, announced it would be building in Berkeley County at a location that would convey additional flow to PS061, thus increasing the firm capacity required at the new PS060.

Some of the design challenges associated with the Pump Station 060 Replacement included but not limited to: confirming the pump station wetwell that was designed based on earlier projected flows, would adequately accommodate the additional flow capacity from Volvo; sizing and configuration of pumps to satisfactorily handle the low flows at startup while also being able to satisfy the increased flows over time without excess wear and tear on the pumps; and maintaining the existing pump station in continuous operation during construction.

For more information, please contact the author at lfanning@hazenandsawyer.com.

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