City Vista Residential Development - Nashville, TN Case Study

Key Takeaways

• Reduced system footprint by approximately 40% compared to the originally proposed 96-inch pipe system.

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  Achieved required detention volume using a modular AquaCell system with 43,419 ft³ of tank storage and 50,584 ft³ total volume with stone.

   

• Optimized constructability by relocating the system to a shallower area of the site with a final burial depth of approximately 26 ft.

   

• Delivered a scalable, high-strength solution using AquaCell EX units rated for HS-25 loading at maximum allowable depth.

The Problem

The City Vista Residential Development in Nashville, Tennessee required a large underground detention system to satisfy the site’s stormwater storage requirements. The engineer of record originally proposed a 96 in. diameter, 230 ft. long pipe system installed at depths greater than 22 ft. This concept posed several challenges, including very deep excavation, increased construction risk, higher cost, and limited flexibility within the site’s varying elevations.
Integrated Technologies, played a key role in coordinating communication and design collaboration between Wavin and the engineer of record. Their involvement ensured that alternative system configurations, including modular detention, could be fully evaluated and optimized for the constraints of the site.

The Solution

To address these challenges, the team redesigned the detention solution using AquaCell EX modular units. The final configuration provided 43,419 cubic feet of internal system storage, with a total effective storage volume of 50,584 cubic feet when accounting for stone backfill. The system consisted of an SC-8-layer configuration wrapped in non-woven geotextile, installed with a 6-inch stone foundation layer. Relocating the system to the shallower end of the site reduced excavation depth and improved overall constructability. The AquaCell EX crates were used for their strength and suitability at depths up to approximately 26 feet under HS-20 traffic loading.

The Impact

The AquaCell design provided substantial reduction in system footprint, simplified installation, and eliminated the need for deep trenching required by the original pipe design. The modular configuration improved handling efficiency, reduced material cost, and allowed the contractor to complete installation within the compressed summer 2025 schedule. The final system delivered the required volume while enhancing long-term maintainability and structural reliability.