SPEL Basin

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SPEL Basin Modular Bioretention System is a highly advanced stormwater filtration system. Its size and capacity make it ideal for stormwater treatment trains that require high pollutant reduction in a small footprint. It can be used in place of standard catch basin structures, rain gardens, bioretention cells and media filters.

As a self-contained treatment train, it incorporates the following treatment components:

  • screening
  • hydrodynamic separation
  • media filtration
  • bioretention filter

The bioretention filter is an enhanced sub surface flow vegetated wetland with a special blend of sorptive media.

The Modular Bioretention System’s treatment train approach makes this system very effective at removing a wide range of stormwater pollutants.

Key Advantages

  1. Application
  2. Can be used in a wide range of configurations for new construction and retrofit applications.

  3. Versatility
  4. Because of its availability to accept variable pipe sizes or runoff directly from the built-in curb or drop inlet, this system can be used in most situations, regardless of site constraints.

  5. Lower Maintenance
  6. A pre-filter chamber eliminates the need for maintenance to be undertaken in the Biorention chamber.

  7. Volume Sizing
  8. The Modular Bioretention System can be installed downstream of retention systems.

SPEL Basin Demonstration


  • Commercial
  • Industrial
  • Residential
SPEL Basin Site Example


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Modular Wetlands

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