Patented Technology for the Integration of Water Quality Storage and Peak Flow Control

The Only System that Reduces Stormwater Storage Volumes to the Least Possible Size

Finished development in 2002 and granted a Patent on May 30, 2006 as No. 7052206 by the US Patent and Trademark Office,  this system should be used for new developments to comply with federal and state (and local) environmental, water quality and storm water discharge limitations (US EPA, NPDES, SPDES) especially when land area for installation is limited though provides savings even when excess land is available.

The system may also be used to design a retro-fit to reduce peak flows and provide storm water treatment at the least possible size.

The Extention Basin™ is in operation in a variety of locations and has obtained numerous local and state (NY) approvals for use in industrial, commercial and residential sites.

1. Continuous peak flow reduction over any range of storms (e.g. 0 year thru 100 year storms)

2. Capture the first-flush where 80-90 per cent of pollutants in runoff are found in storm water or the required Water Quality Volume (WQv)

3. Use in conjunction with any BMP (e.g. extended detention, infiltration, sand filter, etc)

4. Absolute minimum storage volume - generally 50% - 65% compared to conventional systems

5. Minimum land footprint - fully subsurface or above ground units are available

6. Modular construction

7. Expandable for future uses and watershed changes

8. Accurate natural watershed hydrograph matching (peak flow, time to peak) to minimize storm water impacts downstream

9. Passive design with no moving parts - no valves or controls

10. Market Ready! Can adapt to standard water quality practices such as extended detention, infiltration basins, etc.

11. Complete operation and performance may be modeled using HEC-1 software but is best solved using our  high-level EBSolve™ - a powerful software application that fully optimizes the model parameters

12. Modular Materials: Plastic or pre-cast concrete for subsurface units

Latest Installation! - Clarion Estates, Greenburgh, NY water quality control in drywells and detention storage in subsurface chambers as shown.  Concrete box is the EBS control structure.

1. Control storm water and water quality impacts from the new development of roads, homes, shopping centers, etc.

2. Retro-fit existing drainage system to protect lakes and streams from pollutants, polluted runoff and excessive peak flows.

The Extention Basin may be entirely underground using a main control structure and piping for Peak Flow control and Water Quality Treatment using infiltration or other means.	Above: EBS provides the required plastic flow control panels for the designed flow distribution - eliminating detailed forming in concrete.  Generally, three panels are required for water quality and peak flow control.
The Extention Basin may be designed with surface storage basins or with combinations of surface and subsurface.  For more information see the 3D Views or the Filmstrip

Technical details of the method of operation of an Extention Basin can be found in the Technical Papers.

New Research Paper!  The contribution of small storms to annual runoff volumes using the SCS curve number (2005)