The City of Fort Smith, Arkansas needed to upgrade pump stations within the sewage collection system as part of a citywide wet weather flow management program. This program included replacing and upsizing gravity sewers and increasing the pumping capacity of wastewater pump stations. For some larger stations, temporary flow storage is necessary to reduce peak, wet weather flows pumped to the city’s wastewater treatment plants.
In 2009, the City of Fort Smith selected Hawkins-Weir to design the Zero Street Pump Station and Wet Weather Improvements Project to replace the original Zero Street Pump Station, in operations since 1978. The project provides pumping of normal, dry weather sewage flow; and separate pumping and temporary storage of peak, wet weather sewage flow. The pump station included a self-cleaning, trench-style wet well, influent screening, two dry weather pumps, and three wet weather pumps for a pumping capacity range of 0.75 to 16.1 MGD. Two 5 million-gallon precast concrete storage tanks provide temporary flow equalization. Ancillary features included an electrical/chemical building, odor control facilities, and interior tank wash system.