Seismic, Watertight, Accessible, Easy to Maintain

The SPEQ is our most efficient system with the highest void ratio and can be constructed for internal heights ranging from 3'-14'. Its large cavernous interior promotes good air flow and visibility for safer entry than other comparable systems on the market. The floor is also flat allowing for drainage to a corner when constructed on a sloped bedding.

Project Galleries

Primary Applications

  • Large Projects
  • Restricted foot print areas where depth is not a concern
  • Heavy loading areas with up to 20’ of earth cover
  • Watertight requirements without the need for a PVC/HDPE exterior liner
  • Seismic Zone areas as designated by the USGS
  • Infiltration, Detention or Rainwater Harvesting

More Information



Stormprism detention system units can be easily modeled with the HydroCAD Stormwater Modeling System, allowing simplified calculation of the unit's storage and infiltration behaviors. The HydroCAD Chamber Wizard also performs automated chamber system layout and simplifies the process of designing a system meeting specific storage and footprint requirements. Click here for details.