A Cost-Saving Stormwater Alternative for an Auto Spa

Case Study by: StormTank, December 18, 2023
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A new Tidal Wave Auto Spa location opened in Helena, Alabama in the summer of 2023. An early version of the site development included an underground stormwater detention system providing 18,800 cubic feet of volume in a 60” diameter corrugated pipe system. During the bidding phase of the project in 2022, Brentwood’s StormTank team proposed a value engineering alternative to the pipe detention using 36” tall StormTank 25 Series Modules – an AASHTO HS-25 load rated product with a 97% void space ratio.

The StormTank Module alternate reduced the detention footprint by 23%, the required stone backfill quantity by 22%, and provided an equal detention volume in a shorter stage storage window. The installed cost of the StormTank system was determined to be a substantial savings against the installed cost of the pipe detention, so the StormTank Module detention system was used in the construction of the project.

The 36” StormTank Module system included Debris Row sections at the inlet points to capture and isolate influent suspended solids, trash, and other stormwater pollutants. These pollutants are prevented from spreading throughout the detention system, which greatly simplifies the long-term cleaning and maintenance process for the owner.

Civil Engineer of Record: Atlas Technical Consultants

Sitework Contractor: Cahaba Grading

Drainage Materials Distributor: Consolidated Pipe & Supply Company

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