Stormwater Detention

Smarter stormwater solutions with mack industries:

Design advantages superior to other technologies in minimum and maximum burial requirements.

The Arcs have a span of 9′-4″ between parallel rows of chambers with a running length of 4′. The units are universal allowing for installation with any concrete stormwater chamber ranging in height from 1′ to 6′. The design eliminates the need for intricate and expensive header distribution by allowing stormwater to flow freely through the entire system and is contained by a solid wall on the outside.

Cost-Effective Installation –

  • 45-55% smaller footprint compared to other solutions – less labor.

  • Significantly less stone required.

  • Lightweight system allows easy installation with standard excavation equipment. No Crane Needed.

  • Unmatched installation speed with lower labor requirements.

Customizable Designs –

  • Engineered to fit any site layout.

Storage Capacity –

  • The highest capacity modular precast detention system in the industry.

Durable & Strong –

  • Precast concrete design supports H20 wheel loads with minimal soil cover.

Maximum Site Utilization –

  • High storage capacity per surface square foot frees up valuable space for buildable land.

HS-20 Rated

Third-party tested, StormArc uses reinforced concrete for superior underground strength. Eliminating the risks of plastic chambers and special compaction needs.

Substantial Savings

StormArc saves on stone, labor, and excavation with a smaller footprint. It eliminates complex installs, cranes, and slabs, while being on par with plastic chambers — all while lasting decades.

No Soil Intrusion

The Arcs interlock with lips to prevent soil penetration, while end units feature concrete slabs and metal pipes for a secure, confined system.

StormArc specifications

StormArc dimenstions are 9.4′ W x 4′ L x 12″ H

(from the top of the chambers)


The length may be modified from 1′ – 4′.

Versatile- Allows for Different System Configurations

All projects are not the same and have different challenges regarding space. StormArc provides engineers the ability to design systems in different configurations.

Typical Detention/Retention

Typical Dog Leg

Customized with Multiple Beds 

and Various Heights

Customized with Stepped Bed

For More information on Stormarc: