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The use of proprietary SUDS and Green Infrastructure as Source Control techniques at plot level5th May 2016 – CIWEM - SUDS; 20 years onDr Rebecca WadeSenior Lecturer – Abertay University

School of Science Engineering and Technology - uwtc.abertay.ac.uk - sudsnet.abertay.ac.uk

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Source Control

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• Reduce size of flood risk problems (and management features) downstream

• Provide first level of treatment in a treatment train for a development

• Reduce size of site control SUDS(?) • Reduce burden on public purse for end-of-pipe features.• Potential to provide more opportunity for ES/Biodiversity

Why source control SUDS?Who Benefits?

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Source control – Multiple mentions in C697 (2007)‘Proprietary’ silt removal,

filtration and flow control

SUDS for Roads (2009)Lots of mention of source control ‘proprietary’ only mentioned

wrt vortex control systems

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C753 (2015)

Considerable mention of propietary systems/ options/ treatmentsCh 14 dedicated to proprietary systems

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“Source control can greatly reduce management costs of downstream SUDS … However, there are limited examples across Scotland of the treatment train and the use of emerging source control techniques such as green roofs and proprietary SUDS at the single plot level and in dense urban areas”

CREW Source Control Report (2015)

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CREW Source Control Report (2015)

“Ideally source control techniques should be located as close to the source of rainfall as possible, however the responsibility of a house plot source control measure falling to the owner is also identified as a barrier to uptake”

“… However, research into emerging innovative techniques such as green roofs and rain gardens is limited in Scotland and this may prove to be a barrier in the future”

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Testing proprietary Unit Plot SUDS at Abertay

2013 NovaTech paper(D’Arcy, Campbell, Wade)

2013 - 2015 MSc /BSc projects at Abertay w. C&D Associates

– SUDSbutt– SUDSbox– Raised raingarden

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The use of proprietary SUDS and Green Infrastructure as

Source Control techniques at plot level

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James Travers – Senior Engineer5th May 2016

Limitations of source control SUDS

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Typical Site Layout• Layouts• Land costs/competition• Plot densities• Designing streets• Legislation/guidance, no

section 7 agreements• 2 stages end of line• Why a third for housing?• Typically filter trenches

or porous paving• Poor maintenance • Costs

MSc Project

• Assessment of modular house plot drainage systems as source control SUDS

• Design & testing of SUDS Box Within Abertay Campus

• Sized for a hardstanding of 100 Sq. m roof area + 30 Sq.m parking

• Average house plus 2 parking spaces• Geographic location • Vertical Perforated outflow Control

panel (multi orifice)• Simulated rainfall – up to 200yr + 20%

climate change

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SUDS Box

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SUDS Box

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Rainfall Simulator

• 2 No. 1250l water tanks• Manually adjustable valve controls• To mimic any storm event (micro

drainage output)• At full plot scale• 1 hr test using approx.3000l of water

WaterTank V-notch

WeirTreatmentChamber

SUDS Box

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• 1500l capacity (6 No. stormcell units)• 100mm dia. inlet• Perforated outlet plate (multi 5mm dia.

Holes)• Ran at full plot scale• 1hr test using up to 3000l of water

SUDS Box Results

• Assuming no infiltration or losses

• 200 year storm outflow reduced to below 30 year

• Delayed time of entry to sewers

• Increased retention time

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Torrance Park

• Scottish Government approach Central Scotland Green network (CSGN) to involve a major house builder with regards to Green Infrastructure

• Installations at Torrance Park• Greener gardens client leaflet • VIBES Judge’s visit, Sept. 2015• Co-operation Award Winners

2015

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Future Work

• Torrance Park testing in conjunction with Abertay University on SUDS Box for min. 2 years

• Rain gauge installation to record events against outflows

• Liaise with local schools on surface water management & biodiversity

• Further work with the Scottish Government and CSGN on the Greener Gardens initiative

• Potential of additional trial Raingardens over further Taylor Wimpey West Scotland developments

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New Considerations

• SEPA Regulatory method WAT-RM-08 (Sustainable Drainage systems)• Interception storage – considered & receiving environment (ex. 100%

SC if less than good status)• CIRIA C753 SUDS Manual• Scottish Government• Local Authorities• Scottish Water

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C&D Associates

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From Sewers to Source Control SUDS UWTC – over 20 years

• Chris Jefferies (to 2012)• Joe Akunna• David Blackwood• Rebecca Wade• Alison Duffy• Neil Berwick• Dan Gilmour• Field and Lab Technicians• Many Other staff and associates…

(including Brian D’Arcy)

• PhD students• MSc students

• Wastewater management– Sewerage assets– exfiltration

• Loads & Flows measurement• Stormwater management• Diffuse Pollution management• Disconnection of surface water• Water Vision• Whole Life Costs• Treatment train assessment• SUDSnet• 3D visualisation• Transitioning• Decision Support Tools• Multiple Benefits and ES

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Collaborative working drives progress• Partnerships and Knowledge exchange

– Teaching (MSc and SUDS On-line)– Training (SG, LAs, SW, SEPA)– KTPs – Scottish Water; Greenbelt Group

• Contract and Consultancy work• SNIFFER and CREW projects• EU, Global and UK research• Making the Most of Masters

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Thanks for your attention

James Travers (Taylor Wimpey)– James.Travers@taylorwimpey.com

Rebecca Wade (Abertay)– r.wade@abertay.ac.uk