Wildfowl and Wetlands Trust presentation on Sustainable Urban Drainage solutions at CaBA Regional Learning Workshops
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Andy Graham from WWT presents a design guide to SuDS from principles to practice http://www.rspb.org.uk/Images/SuDS_report_final_tcm9-338064.pdf
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Wildfowl and Wetlands Trust presentation on Sustainable Urban Drainage solutions at CaBA Regional Learning Workshops
- 1. Sustainable drainage systems for people and wildlife - from principles to practice – Andy Graham
- 2. What do SuDS do? Manage volume Improve stream quality Space for wildlife Amenity Mimic nature *can be quite dry
- 3. conventional v. SuDS • Manage runoff volumes and flow rates from hard surfaces • Protect/enhance water quality • Support flow regimes (and aquifers) • Support biodiversity • Address local needs • evapo-transpiration from vegetation and surface water (UHI effect) • Create better places
- 4. SuDS are for life... Well-being Educational Climate regulation Water regulation Erosion control Pollination Habitat/genetic resource
- 5. (some) drivers and tools for change Flood & Water Management Act (2010) – new build only WFD GI (& LBAPS) LNPs/LEPs ? NEP – Water Companies plans Community Development Trusts
- 6. national standards anyone? • Early consideration • multifunctional • follow management train • Allow infiltration • manage close to source possible • foul sewer connection not permitted. • Adoption – likely to be LAs • Already forging ahead despite govt inertia • Current best practice exceeds low bar to be set by government • Voluntary SuDS?
- 8. Rural SuDS Prevent soil loss Reduce diffuse pollution Wetland creation Flood attenuation Sediment traps Swales (check dams) On line wetlands (N removal) Detention/retention basins Wet woodland/scrub WWT guidance on Farm wetlands EA guidance - RSuDS
- 9. principles It’s a resource Manage water at source/surface Store in wildlife habitats Controlled discharge Generate clean water
- 10. principles Multi-disciplinary approach Ecological design Not one size fits all Early engagement with people more for less
- 12. Local engagement
- 14. WWT/RSPB guidance To guide planners and developers Signpost to information To show examples To inspire Push wildlife and people up the agenda
- 15. New Southgate Rail Suds for Schools 1. Coppetts Wood Primary 2. Friern Barnet Secondary 3. Hazelbury Juniors 4. Hollickwood Primary 5. Holly Park Primary 6. Martin Primary 7. Oakthorpe Primary 8. Queen Elizabeth Girls School 9. Susi Earnshaw Theatre School 10.West Lea School
- 17. Key objectives • WFD (EA) • Engagement (Thames Water) Flood management Re-connection with nature (via their brook) Well-being Wildlife
- 22. Hollickwood Primary School •What a wonderful day we had! It exceeded all our expectations. Thank you so much for everything. Please pass on our thanks to all your colleagues who made it such a successful event. •Mr Westmore, Acting Head Teacher •SuDS are now well and truly in the Hollickwood consciousness, and also of all our community guests, (I see that all the parents' Facebook pages are going crazy tonight with admiring comments about our SuDS!). •Linden Groves, Parent & Gardening Committee
- 24. “Love the garden. The children sit at the benches by the garden every break and lunchtime” Susi Earnshaw
- 26. Key challenges Retro-fit programme Inertia and cultural change (lack of) awareness of wetland values Adoption & maintenance Safety Demonstration sites
- 27. Some conclusions Take the wetlands to the people Community management makes SuDS sustainable SuDS – integral to solving many issues/agendas (inc diffuse pollution)
- 28. Free training CABA funded one day workshop SuDS training LWC April/May andy.graham@wwt.org.uk
Editor's Notes
- The site uses source control and the SuDS management train. Full attenuation of the 1 in 100 year storm is provided through the use multi use of open space (which is more cost effective). The storage required the use of Public Open Space, which includes basins in play areas. Overland flow routes were provided for runoff in excess of the design volume, sacrificial storage was provided for storms in excess of 1 in 100 year event. Quality, quantity and amenity were considered equally although particular attention was required to consider flood risk management. Engagement with the residents also took place to ensure that they understood how the site functioned. The SuDS Mgt Train Prevention – Water Butts provide prevention, lots of grassed areas as well. Drainage from impermeable areas leads into permeable pavement – source control. There is a token gesture of green roofs – however, depending on construction can provide 30-50% (if not more) this is regarded as a source control measure. Roof water is also collected into swales – which is a source control measure and the conveyed onwards to basins. Swales convey the water to detention basins that act as site control and only get wet in a 1 in 100 year event. The swale network then conveys water to a retention pond which acts a regional control at the bottom of the site.