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Jensen Beach, Florida

Stormwater Detention






MJC Land Development


December 2017

Technical Description:

  • 48" perforated Aluminized Steel Type 2

The new CarMax on Jensen Beach Boulevard sits on a 9 acre site which has the capacity to store approximately 200 pre-owned vehicles.  Naturally, a site of this size needs a robust stormwater management system. Given the urban nature of the site, it was more cost effective to store the runoff underground rather than in a large above ground pond.

Engineers from Kimley-Horn asked Contech engineers to design an underground detention system using plastic chambers. Contech engineers proactively reviewed the site plans and realized the depth of the system could be increased to accommodate 48” diameter corrugated metal pipe (CMP). Using CMP instead of chambers would result in a smaller footprint, resulting in less excavation and 40% less stone volume. In addition, the system requires only 12” of cover to support the traffic loading. Contech presented the CMP option to the engineers and they agreed CMP was the better solution.

Contech worked with the engineer to customize the design layout to avoid conflicts with light pole foundations and tree islands while maintaining the required storage volume within the available footprint. Several design iterations were completed to optimize the system and meet the site’s needs before finalizing the design.

In the end, a 48” diameter, perforated, aluminized corrugated metal pipe (CMP) detention system was installed that provides 85,000 cubic feet of storage.

Technical Description:

  • 48" perforated Aluminized Steel Type 2

800-338-1122 |


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