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Canterbury Commons

Westlake, Ohio

Stormwater Management

Engineer:

GBL Design

Contractor:

KMU Trucking and Excavating

Installation:

June 2019

Technical Description:

  • (2) CDS® Hydrodynamic Separators
  • 315' of 120" Solid Aluminized Steel Type 2
  • 715' of 96" Perforated Aluminized Steel Type 2 

Constructed in 2019, Canterbury Commons is a commercial development that houses a 45,000 square-foot Marc’s grocery store and two 3,942 square feet outlot buildings. Developing the site was challenging, as multiple older buildings had to be raised, and dozens of old boats and RVs stored on the property for decades needed to be removed. In addition, thousands of cubic yards of engineered fill were brought in to level the site to make it usable.

The site was subject to stormwater regulations that called for stormwater treatment and detention. Engineers specified two CDS hydrodynamic separators and a corrugated metal pipe (CMP) underground detention system from Contech Engineered Solutions.

Stormwater is directed to a diversion structure that splits the flow between two CDS hydrodynamic separators. The CDS units use swirl concentration and continuous deflective separation to screen, separate and trap trash, debris, sediment, and hydrocarbons from the runoff before it enters the CMP detention system. This approached lowers long-term maintenance costs and extends the life of the detention system.

Site conditions allowed for large diameter pipe to be used, which maximizes storage in the smallest footprint. The system utilizes 120” solid CMP and 96” perforated CMP. The 120” was placed at 24” or 2’ below the 96” invert. This results in a permanent pool (sump) in the 120” where additional sediment settling can occur, providing easier maintenance as the vast majority of sediment will be captured and stored in 120” pipe versus the entire system.

Installation went smoothly, with Contech providing pipe pieces of 40’+ in length to reduce the number of joints and pieces the contractor needed to set, saving both time and money. 

Technical Description:

  • (2) CDS® Hydrodynamic Separators
  • 315' of 120" Solid Aluminized Steel Type 2
  • 715' of 96" Perforated Aluminized Steel Type 2 

800-338-1122 | www.ContechES.com
Project #: 601213

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