Project Overview

Recognizing the need for another equalization basin to regulate the flow rate to its wastewater treatment system during heavy weather events, the Montgomery County Sanitation District hired consulting engineer Black & Veatch of Cincinnati to determine an optimal solution. After researching available options, Black & Veatch specified an AWWA Type III wire-wound prestressed concrete tank due to its long-term durability and negligible maintenance requirements. Preload, which has designed and constructed other equalization basins for Montgomery County, was selected as the preferred tank builder.
Built in 1998, this Preload equalization basin has a capacity of 700,000 gallons, an 89’ inside diameter, and a 15’ side water depth. The tank is mostly buried below the groundwater table alongside a creek bed. The tank’s dome features a suspended aluminum walkway bridge and a central platform for tank wash-down. A dormer on the dome provides access through the dome, connecting to a wall-supported aluminum stairway to the ground. Multiple dome penetrations include skylights, ventilation fans, ducts, and hatches.
The tank has an augercast pile foundation system to provide support for the structure and to resist hydrostatic uplift when the tank is empty.