David Schofield, Associate Director

CIHT North Western Branch Seminar Highway Management Practices For Tough Times, Tuesday 30 April 2013

Managing Surface Water Quality from

Highway Runoff with Sustainable Drainage

UK’s Quality Challenge: The Water Framework Directive, National SUDS Standards, BS 8582, etc.

Innovative Bioretention Device or; Simply Unacceptable Maintenance?

“Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs”

Gro Harlem Brundtland

UK Surface Water Quality Case Study

Housing Development Planning Application Objection

United States of America Sustainable Drainage

2006 & 2011 Sustainable Drainage Technical Visits Representing Arup www.yorkshirewater.com/your-water-services/waste-water-and-sewerage/sustainable-urban-drainage-systems.aspx

Global Watch Mission Report Was Available on DEFRA’s Website

2006 British Water Led DTI Global Watch Mission

Born in the USA: The Clean Water Act 1972

“Runoff loadings are diffuse, stochastic and highly unsteady, causing significant control challenges” John Sansalone, University of Florida

The Streets of LA; Demonstrating The Requirement For Whole-Life O&M

Contemporary Highway Drainage Techniques

Bioswales, Gully Inserts & Porous Macadam; With Caution

Reducing CSO Spills Into The Willamette River

Managing Portland’s “Big Pipe” Solution With Sustainable Drainage

The Green Streets of Portland, Oregon

Pioneering Portlander Tom Liptan (in 2011) At NE Siskiyou, The First Green Streets Project, Retrofitted in 2003

The Green Streets of Portland, Oregon

The First Green Streets Project At NE Siskiyou; Textbook Multiple Benefits Design & Implementation

The Green Streets of Portland, Oregon

Each Green Street Visited Up To Four Times A Year For Maintenance

Independent Third Party Validation for Proprietary Surface Water Quality Technology

“Upon successful completion of expanded performance testing, the Downstream Defender® by Hydro International has been certified for the use of TSS treatment in online applications by the New Jersey Department of Environmental Protection’s Bureau of Nonpoint Pollution Control, one of the most respected stormwater authorities in the United States.”

UK Applicable Validation?

How Do We Validate Whole Life Sediment & Pollutant Capture Performance Of A Swale?

High Point Development, Seattle, Washington Bioremediation/Biofiltration/Bioretention Techniques

Ensuring SuDS Are Authentically Sustainable

Detention Basin Sediment Forebay Inlet 2005; Construction

Ensuring SuDS Are Authentically Sustainable

Detention Basin Sediment Forebay Inlet 2008; Going....

Ensuring SuDS Are Authentically Sustainable

Detention Basin Sediment Forebay Inlet 2013; Gone

Proprietary Water Quality Technology Sediment Capture Performance with CFD

Gravitational Separation Device: The Catchpit

Forces Acting on a Particle in a Simple Linear Sedimentation Chamber or Catchpit (where Fd = drag and Fg = gravity)

• Gravitational sedimentation • Quiescent conditions • Linear tanks, gullies and catchpits

Fg

Fd

Proprietary Water Quality Technology Sediment Capture Performance with CFD

Forces Acting on a Particle in a Hydrodynamic Vortex Separation Chamber

(where Fd = drag and Fg = gravity Adding Fc = Centrifugal Force)

• Enhanced gravitational sedimentation • Harness rotational behaviour • Extends flow path and chance to settle • Reduced footprint and cost • Low headloss separation • Base flow sweeps sediment into sump

Advanced Hydrodynamic Vortex Separation

Proprietary Water Quality Technology Sediment Retention Efficiency During High Flows

Sediment Retention Efficiency of Traditional Gravitational Separation Devices (Catchpits)

Gravitational Separation Device at Peak Flow Sump loaded with fine sediment for washout simulation

Sediment Retention Efficiency of Advanced Hydrodynamic Vortex Separation

Proprietary Water Quality Technology Sediment Retention Efficiency During High Flows

Hydrodynamic Vortex Separator at Peak Flow Sump loaded with fine sediment for washout simulation

Proprietary Water Quality Technology Research & Development Third Party Validation

Downstream Defender’s supplied for M25 Retrofit (Highways Agency) with a growing number of other projects across the UK

Lab Testing • Maine DEP • TARP Tier I • Washington DOE

Field Testing • ETV – EPA Madison, WI • PhD – Trinity College Dublin

Washout Testing • Liverpool John Moore’s

University – model scale testing • University of Minnesota – full

scale testing Analysis of Sediments Captured

• University of Bristol Study over a 10 month period, including car parks, roads and residential development.

• Some units captured up to 3m3

Proprietary Bioretention Technology: Engineering Nature’s Way

Hydro Filterra™ Bioretention System

Hydro Filterra™ Bioretention System

Proprietary Bioretention Technology: Engineering Nature’s Way

Essential: Whole-Life Operation & Maintenance for Authentic Sustainable Drainage

Standard O&M Plant, Reduced Health & Safety Risks

Thank You For Listening dschofield@hydro-consultancy.com

www.hydro-int.com www.hydro-consultancy.com

www.swim-innovation.com www.engineeringnaturesway.co.uk

“Sustainable drainage is drainage that meets the needs of the present without

compromising the ability of future generations to meet their own needs”