The “UniStorm” is environment 21’s system which employs low head loss internal flow diffusers and flow distributors.  This design reduces turbulence, improves flow distribution, and allows on-line operation to eliminate pollutant bypass during high intensity rainfall events.  The UniStorm is available in manholes and vaults , and it carries the environment 21 reputation for helping meet EPA regulations of 80% TSS, but the cost savings obtained from using a single structure design.  In addition the UniStorm can be designed with a flow control device when it is being utilized at the outlet of detention, creating the perfect treatment train.

If you are looking for a cost effective option to help meet EPA Phase 2 Stormwater requirements then contact our sales office at 1-800-809-2801.

For more product and testing information please contact environment 21.


The NYSDOT is currently reviewing, revising, and eventually issuing the new SWTD Specification, §738-01.  The Environment 21 StormPro was reviewed by the NYSDOT and conditionally approved pending issuance of the new SWTD Specification.  In the interim, the StormPro may be used on NYSDOT projects after standard review by the NYSDOT office nearest to the proposed project.