Utilities Infrastructure / Water
PIQUA WASTEWATER TREATMENT FACILITY
||City of Piqua|
KEY STRUCTURAL CHALLENGE
- Design a 140-foot, 3.0 million gallon flow equalization basin and diversion structure ahead of the wastewater treatment plant to reduce sanitary sewer overflows during high precipitation periods.
- Design walkway bridge across basin, center platform, handrails, and stairs, diversion chamber, backflow preventer, water meter housing, generator foundation, transformer slab, and electric equipment foundation/slab, as well as a support for a new, standby power generator.
SOLUTION/FACILITIES GOP completed these elements for this $3.9 million, one-year project:
- The foundation to support a new 150-foot diameter, 25-foot high equalization tank, with a recirculating pump structure in the tank's bottom. A rock anchor system resists flotation during the 100-year flood elevation, and is excavated into a hillside.
- The stairs were designed to access the basin from ground level outside the basin; a catwalk structure across the tank provides access to the sump structure.
- Foundations/slabs were designed for the backflow preventer/water meter housing, standby power generator, transformer, and electrical equipment near the diversion chamber.
- A diversion chamber on top of the existing influent sewer line was designed.