Terre Arch Concrete Detention and Infiltration

Terre Arch is a modular, multi-chambered, precast concrete stormwater storage system engineered for underground installation. Terre Arch’s strength, storage capacity, and fast installation make it the most economical concrete system available.

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Precast Concrete System for Stormwater Detention and Infiltration

Terre Arch is a modular, multi-chambered, precast concrete stormwater storage system that is engineered especially for underground installation. Terre Arch utilizes a proven arch design to provide a simple solution for stormwater detention and infiltration.

Terre Arch’s patented, fiber-reinforced design is lightweight, yet incredibly strong. With a load-bearing rating of HS-25 (with 12” cover from the top of the arch to final grade), each section can support heavy gross weight trucks and machinery, allowing installation equipment direct access to the site during installation, dramatically reducing installation time and labor.

Because little cover is required, Terre Arch is the best solution when the site engineer is faced with site restrictions such as high ground water tables and minimum separation between the top of the underground structure and the finished grade.

Each Terre Arch installs quickly, adding several hundred cubic feet of storage in a matter of minutes.

 Terre Arch Benefits

  • 100+ year design life
  • Lightweight fiber reinforced concrete
  • Minimum 5,000 psi compressive strength HS-25 load rating
  • No concrete foundation required
  • 12” minimum cover above arch
  • Simple and fast installation; install 30,000 - 50,000 cubic feet of storage per day
  • Provides maintenance access to individual chambered rows
  • Less cover required compared to plastic chambers

Terre Arch Configurations

Terre Arch 26
Terre Arch 26 is a connected 4 arch precast concrete structure providing 277 CF of installed storage and 152 SF infiltration area. Since it is less than 3’ high, Terre Arch 26 is great for shallow sites and low drop infiltration systems.

Terre Arch 48
Terre Arch 48 is a connected 3 arch precast concrete structure providing 541 CF of installed storage and 160 SF infiltration area.

Terre Arch Installation

No other concrete system can match Terre Arch’s ease of installation. With a properly excavated and prepared base, a Terre Arch can be set every five minutes; with installation of up to 50,000 CF of storage in 1 day, including cover and backfill. The “just in time” delivery of Terre Arch reduces material handling and eliminates on-site storage.

Terre Arch Maintenance

Terre Arch is the only chamber system that provides worker access from distribution boxes that extend from grade to the inside of the installed arch, providing confined space entry for removal of sediment and debris from inside the structure.

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Precast Systems for Stormwater Detention and Infiltration

Our CON/SPAN and Terre Arch concrete stormwater detention and infiltration solutions provide the versatility to accommodate any footprint needed. These patented precast structures are engineered to the highest degree – ensuring structural integrity.

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