River Oaks Diversion Design-Build

Ardurra serves as the prime engineer for Hillsborough County's River Oaks Diversion Design-Build Project, a critical component of the comprehensive Northwest Wastewater Consolidation Program, retiring the Dale Mabry and River Oaks Advanced Wastewater Treatment Facilities while diverting flows to the expanded Northwest Regional Water Reclamation Facility. The strategic consolidation approach uses Design-Build delivery to achieve efficient, cost-effective design while optimizing risk management for the County.

The complex project encompasses a new 24-MGD wet pit-dry pit pumping station featuring an innovative "self-cleaning" trench-style wetwell design with emergency bypass capabilities. Comprehensive infrastructure includes 18,000 linear feet of new force mains, 13,000 linear feet of reclaimed water main, and specialized construction techniques, including jack-and-bore railroad crossings and directional drilling beneath sensitive wetland areas.

Key Project Components:

• Designed 24-MGD pumping station with self-cleaning trench-style wetwell, emergency bypass, and comprehensive pump configurations, including diesel engine emergency operation

• Installed 5,000 LF of 36-inch force main from River Oaks AWTF site crossing the major Channel A waterway parallel to Upper Tampa Bay Recreational Trail

• Constructed 13,000 LF of 30-inch force main to NWRWRF through urban 4-lane roadway median with CSX railroad jack-and-bore and wetland directional drilling

• Implemented 13,000 LF of 20-inch reclaimed water main along urban landscaped roadway with parallel alignment to new force main infrastructure

• Engineered a 30-MGD cascade-type aeration outfall structure discharging to the major Channel A drainage system

• Managed plant demolition and site repurposing following successful flow diversion, enabling future development opportunities

The consolidation program provides Hillsborough County with enhanced wastewater treatment efficiency while demonstrating innovative pumping station design and the installation of complex urban infrastructure. Strategic Design-Build delivery optimizes project risks while achieving cost-effective consolidation, supporting regional wastewater management objectives and environmental protection.