Practice 16: Hydrodynamic Devices

The hydrodynamic devices listed on this page are approved by DEQ for use to meet the total phosphorus (TP) water quality requirements of Virginia Stormwater Management Program (VSMP) regulation.* The assigned Event Mean Concentration (EMC) percent TP removal efficiency may be manually added into the Virginia Runoff Reduction Method (VRRM) spreadsheets to demonstrate water quality compliance.

*DEQ does not endorse any device and does not provide assistance with device selection.

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BACKGROUND

DEQ Evaluations

The devices listed here have been approved by DEQ in accordance with in accordance with § 62.1-44.15:28 of the Code of Virginia and 9VAC25-870-65 D of the Virginia Stormwater Management Program (VSMP) Regulation.

For each approved manufactured treatment device (MTD), the following information is provided:

      • DEQ approval letter
      • Web link to view specifications and other product information
      • Vendor contact information
      • Information reviewed by DEQ.

If you have questions regarding an evaluation, please contact DEQ’s Robert Cooper, P.E., at Robert.Cooper@deq.virginia.gov or 804-698-4033.

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Sizing Information

To obtain the water quality credit assigned to a manufactured treatment device (MTD), the device must be properly sized. The MTD vendor and design professional are responsible for properly sizing a specific device for a given project.

DEQ recommends that designers and reviewers contact the MTD vendor for specific information regarding the type and size of device needed for each specific project.

To determine the MTD size needed for a project:

      1. Calculate the treatment volume to the device (TvBMP). The calculated TvBMP can be obtained from the Virginia Runoff Reduction Method (VRRM) spreadsheets.
      2. Calculate the peak discharge of the obtained treatment volume (qpTv). DEQ’s preferred method to calculate the peak discharge for a BMP drainage area is described here.
      3. Work with the MTD vendor to ensure that the obtained peak discharge to the device (qpTv) is less than or equal to the maximum treatment flow rate (MTFR) of the device (qpTv < MTFR).

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HYDRODYNAMIC DEVICES AWARDED 20% TP REMOVAL EFFICIENCY

(listed alphabetically)
Aqua-Swirl® Stormwater Treatment System
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after August 13, 2014. Initial approval letter from DEQ (August 13, 2014).

Specifications for the MTD are available from the website:
https://www.aquashieldinc.com/.

Contact Information: AquaShield Inc.
Mark Miller
2733 Kanasita Drive, Suite 111
Chattanooga, TN 37343
Toll-free: 888-344-9044, Ext. 1766
Direct Phone: 423-468-1766
Fax: 423-826-2112
E-mail: mmiller@aquashieldinc.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration
  • Item 3: NJCAT Technology Verification Report
  • Item 4: NJCAT Summary Letter
  • Item 5: NJDEP Certification Letter
  • Item 6: WASDOE GULD for Pretreatment and CULD for Basic Treatment
  • Item 7: Inspection and Maintenance Manual
  • Item 8: Warranty
  • Item 9: NJDEP Certification Letter (added 12/31/2021)

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Aqua-Swirl® XCelerator Treatment System
Approval letter from DEQ (May 17, 2022) for use with stormwater management plans submitted on or after May 17, 2022.

Specifications for the MTD are available from the website:
https://www.aquashieldinc.com/.

Contact Information: AquaShield Inc.
Mark Miller
2733 Kanasita Drive, Suite 111
Chattanooga, TN 37343
Toll-free: 888-344-9044, Ext. 1766
Direct Phone: 423-468-1766
Fax: 423-826-2112
E-mail: mmiller@aquashieldinc.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: Proprietary BMP Registration Statement
  • Item 3: NJDEP Certification Letter

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Barracuda™ MAX Hydrodynamic Separator
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after January 1, 2022. The previously approved device, BaySaver Barracuda, has been included on the Prior-Approved List of Hydrodynamic Devices for use with stormwater management plans submitted between November 8, 2017 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.adspipe.com/.

Contact Information: Baysaver Technologies LLC
Travis Dorman
1030 Deer Hollow Drive
Mount Airy, MD 21771
Phone: 540-526-6045
Fax: 866-802-2641
Email: travis.dorman@adspipe.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
  • Item 2: NJCAT Technology Verification Report
  • Item 3: NJDEP Certification Letter

2022 Updated Submission:
  • Item 4: MTD Registration (added 2/21/2022)
  • Item 5: New Jersey Department of Environmental Protection Certification (added 2/21/2022)
  • Item 6: NJCAT Technology Verification (added 2/21/2022)

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Cascade SeparatorTM
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after November 27, 2019. Initial approval letter from DEQ (November 27, 2019).

Specifications for the MTD are available from the website:
http://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific and Design Questions:
Baltimore, Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Resubmission (December 29, 2021):
  • Item 1: Registration Statement
  • Item 2: NJDEP Certification Letter
Initial information reviewed by DEQ (2019):
  • Item 1: MTD Registration
  • Item 2: NJDEP Certification Letter
  • Item 3: NJCAT Technology Verification Report

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Continuous Deflective Separator (CDS) Stormwater Treatment Device
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after July 9, 2014. Initial approval letter from DEQ (July 9, 2014).

Specifications for the MTD are available from the website:
https://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Rd, Ste. 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific Questions:
Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Resubmission (December 29, 2021):
  • Item 1: Registration Statement
  • Item 2: NJDEP Certification Letter
Initial information reviewed by DEQ (2014):
  • Item 1: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Use the contact information provided on this webpage.)
  • Item 2: WASDOE GULD for Pretreatment and PULD for Oil Control
  • Item 3: Application: GULD for Pretreatment and CULD for Oil Treatment
  • Item 4: Independent Review of Evaluation Testing for Online Application in NJ

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Debris Separating Baffle Box (DSBB) Hydrodynamic Separator
Approval letter from DEQ (May 17, 2022) for use with stormwater management plans submitted on or after May 17, 2022.

Specifications for the MTD are available from the website:
https://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Rd, Ste. 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific Questions:
Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Information reviewed by DEQ:
  • Item 1: Proprietary BMP Registration Statement
    (Note: The contact information for this device has changed since submission of the Registration Statement. Use the contact information provided on this webpage.)
  • Item 2: NJDEP Certification Letter
  • Item 3: NJCAT Technology Verification

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Downstream Defender
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after September 4, 2014. Initial approval letter from DEQ (September 4, 2014).

Specifications for the MTD are available from the website:
https://www.hydro-int.com/en.

Contact Information: Hydro International
Phillip Taylor
94 Hutchins Dr
Portland, ME 04102
Mobile: 608-358-1194
Fax number: 207-756-6212
Email: ptaylor@hydro-int.com

Resubmission (August 23, 2021):
  • Item 1: Registration Statement
  • Item 2: NJDEP Certification Letter
  • Item 3: NJCAT Verification Report
  • Item 4: Operation and Maintenance Manual
Initial information reviewed by DEQ (2014):
  • Item 1: Cover Letter
  • Item 2: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Phillip Taylor.)
  • Item 3: Fact Sheet
  • Item 4: HX Guide
  • Item 5: Schematics
  • Item 6: ME DEP Letter
  • Item 7: WASDOE GULD for Pretreatment (TSS) and PULD for Basic (TSS) and Oil Treatment
  • Item 8: NJDEP Certification Letter
  • Item 9: City of Indianapolis Selection Guide
  • Item 10: ME DEP Testing Report
  • Item 11: NJCAT Technology Verification Report
  • Item 12: Operation and Maintenance Manual
  • Item 13: Report Sections from Onondaga Lake Project

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Dual Vortex Separator (DVS) Stormwater Treatment Device
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after November 18, 2015. Initial approval letter from DEQ (November 18, 2015).

Specifications for the MTD are available from the website:
https://oldcastleinfrastructure.com/.

Contact Information: Oldcastle Infrastructure
Jay Holtz, P.E.
Director of Regulatory Management, Stormwater
7000 Central Parkway, Suite 800
Atlanta, GA 30328
Mobile: 971-271-0796
E-mail: jay.holtz@oldcastle.com

Resubmission (January 13, 2022):
  • Item 1: Registration Statement
  • Item 2: NJDEP Certification Letter
Initial information reviewed by DEQ (2015):
  • Item 1: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Jay Holtz.)
  • Item 2: NJDEP Certification Letter
  • Item 3: NJCAT Technology Verification Report
  • Item 4: Inspection and Maintenance Guide

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First Defense® Optimum Vortex Separator
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after January 1, 2022. The previously approved device, First Defense, has been included on the Prior-Approved List of Hydrodynamic Devices for use with stormwater management plans submitted between September 4, 2014 and December 31, 2021.

Specifications for the MTD are available from the website:
www.hydro-int.com.

Contact Information: Hydro International
Phillip Taylor
94 Hutchins Dr
Portland, ME 04102
Phone: 608-358-1194
Fax: 207-756-6212
Email: ptaylor@hydro-int.com

Information reviewed by DEQ:
  • Item 1: Registration Statemet
  • Item 2: NJDEP Certification Letter
  • Item 3: Operation and Maintenance Manual

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HydroDome (HD) Stormwater Separator
Approval letter from DEQ (May 17, 2022) for use with stormwater management plans submitted on or after May 17, 2022.

Specifications for the MTD are available from the website:
http://www.hydroworks.com/.

Contact Information: Hydroworks, LLC
Graham Bryant
257 Cox Street
Roselle, NJ 07203
Phone: 848-235-5950
Fax: 888-290-7900
Email: gbryant@hydroworks.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
  • Item 2: Appendix 1: NJDEP Certification
  • Item 3: Appendix 2: NJCAT Verified Report
  • Item 4: Appendix 3:Sump Depths
  • Item 5: Appendix 4: Operations & Maintenance Manual

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HydroStorm Hydrodynamic Separator
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after December 7, 2018. Initial approval letter from DEQ (December 7, 2018).

Specifications for the MTD are available from the website:
http://www.hydroworks.com/.

Contact Information: Hydroworks, LLC
Graham Bryant
257 Cox Street
Roselle, NJ 07203
Phone: 848-235-5950
Fax: 888-290-7900
Email: gbryant@hydroworks.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
  • Item 2: Brochure (sizing)
  • Item 3: NJDEP Certification Letter
  • Item 4: NJCAT Verification Letter
  • Item 5: NJCAT Report
  • Item 6: ETV Canada Verification Statement
  • Item 7: ISO 14034 Verification Report
  • Item 8: Alden Testing Compliance Letter
  • Item 9: Alden Testing Report (NJDEP Protocol)
  • Item 10: Operations and Maintenance Manual
  • Item 11: Sizing Software Program (see manufacturer website)

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Nutrient Separating Baffle Box® (NSBB) with Hydro-Variant Technology Stormwater Treatment Device
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after January 1, 2022. The previously approved device, Nutrient Separating Baffle Box, has been included on the Prior-Approved List of Hydrodynamic Devices for use with stormwater management plans submitted between December 7, 2018 and December 31, 2021.

Specifications for the MTD are available from the website:
https://oldcastleinfrastructure.com/.

Contact Information: Oldcastle Infrastructure
Jay Holtz, P.E.
7000 Central Parkway, Suite 800
Atlanta, GA 30328
Mobile: 971-271-0796
Email: jay.holtz@oldcastle.com

Information reviewed by DEQ:
  • Item 1: Application (Registration Statement, NJDEP Certification Letter, Operation and Maintenance Manual)

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SciClone Hydrodynamic Separator
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after March 8, 2018. Initial approval letter from DEQ (March 8, 2018).

Specifications for the MTD are available from the website:
https://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Rd, Ste. 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific Questions:
Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Resubmission (December 29, 2021):
  • Item 1: Registration Statement
    (Note: The contact information for this device has changed since submission of the Registration Statement. Use the contact information provided on this webpage.)
  • Item 2: NJDEP Certification Letter
Initial information reviewed by DEQ (2018):
  • Item 1: Cover Letter and Table of Contents
  • Item 2: MTD Registration (Section A)
  • Item 3: SC-4 Cut Sheet (Section B)
  • Item 4: Brochure (Section C)
  • Item 5: Warranty (Section D)
  • Item 6: NJCAT Technology Verification (112 Micron) (Section E)
  • Item 7: NJCAT Technology Verification and NJDEP Approval (Section F)
  • Item 8: O&M Manual (Section G)

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SciCloneX Hydrodynamic Separator
Approval letter from DEQ (May 17, 2022) for use with stormwater management plans submitted on or after May 17, 2022.

Specifications for the MTD are available from the website:
https://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Rd, Ste. 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific Questions:
Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Information reviewed by DEQ:
  • Item 1: Proprietary BMP Registration Statement
    (Note: The contact information for this device has changed since submission of the Registration Statement. Use the contact information provided on this webpage.)
  • Item 2: NJDEP Certification Letter
  • Item 3: NJCAT Technology Verification

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SiteSaver®
Approval letter from DEQ (April 20, 2022) for use with stormwater management plans submitted on or after June 7, 2018. Initial approval letter from DEQ (June 7, 2018).

Specifications for the MTD are available from the website:
https://stormtrap.com/.

Contact Information: StormTrap
For Project Specific Information:
Dan Fajman
1287 Windham Parkway
Romeoville, IL 60450
Phone: 815-341-9890
Email: dfajman@stormtrap.com

For Regulatory Information:
Luke Matteson
1287 Windham Parkway
Romeoville, IL 60446
Phone 815-263-6972
Email: lmatteson@stormtrap.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration
  • Item 3: NJDEP Approval Letter (Appendix A)
  • Item 4: Warranty (Appendix B)
  • Item 5: NJCAT Testing Report – June 2017 (Appendix C)
  • Item 6: Operations & Maintenance Manual (Appendix D)
  • Item 7: Design Drawings (Appendix E)
  • Item 8: Material Specifications (Appendix F)
  • Item 9: Installation Manual & Installation Photographs (Appendix G)
  • Item 10: NJDEP Certification Letter (added 1/20/2022)

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