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Arctic Avenue

Virginia Beach, Virginia


City of Virginia Beach


CBC Engineers


General - Asphalt Roads & Materials Co Utilities - Adroit Utilities, Inc. Plate Assembler - SILVERBRIDGE Inc.


April 2009

The City of Virginia Beach needed a structure to replace a twin barrel storm sewer that was deteriorating after 13 years in a brackish, saltwater environment.

Contech suggested that a 10-9-in. span x 6-ft. 10-in. rise Contech corrugated 0.125-in. thick Aluminum Structural Plate (ASP) pipe arch be installed, and the City agreed. ASP weighs 1/50 as much as reinforced concrete pipe, reducing assembly and equipment costs and allowing for easy handling of long, preassembled structures.

The City chose the ASP because of its ability to meet critical design factors that were involved with this project. These factors included installation in a brackish water environment, unstable soil conditions, stormwater capacity requirements and a tie in to an existing stormwater system. The ASP satisfied all of the design requirements and, following a cost evaluation, became the best option when compared with other pipe materials and options reviewed.

The solution provided a lightweight structure that was pre-assembled concurrent to excavation. Premanufactured fittings allowed for rapid installation and connections to the existing stormwater drain.

Installation of the structure was completed on higher, dry ground and then placed in the trench in one piece with the use of a crane.

“The installation of the ASP went very well,” noted Chris Hasty, of the City of Virginia Beach, “from the coordination between Contech, pipe representatives and the City’s design team, the pipe delivery and erection on site, construction by the contractor, all the way to the final lift and insertion of the ASP into place. In recent post construction inspection, we found no defects in the ASP and it has provided exactly what we were after in both storing and carrying larger amounts of stormwater during large rain events.”

Technical Description:

  • Span: 10-ft. 9-in.
  • Rise: 6-ft. 10-in.
  • Length: 67.5 LF
  • Product: Aluminum Structural Plate

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