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Module 3: Exploring the options

Module 3: Exploring the options. SWITCH Training Kit Module 3B: Sustainable Stormwater Management An overview. The issues facing urban stormwater management. Inadequately designed and maintained infrastructure. Increased urbanisation. Changing weather patterns due to climate change.

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Module 3: Exploring the options

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  1. Module 3: Exploring the options SWITCH Training Kit Module 3B: Sustainable Stormwater Management An overview

  2. The issues facing urban stormwater management Inadequately designed and maintained infrastructure Increased urbanisation Changing weather patterns due to climate change Fragmented management structures

  3. Links between stormwater management and other areas of the water sector Water supply Water treatment Wastewater management Water quality

  4. Links between stormwater management and other sectors of urban management Housing Roads and transport Solid waste Parks and gardens Land-use management

  5. The conventional approach • Combined sewers • Concrete drainage culverts, channels and pipes • Disposal of stormwater directly into rivers, lakes and coastal waters

  6. Drawbacks of the conventional approach to stormwater management • Increased downstream flood risk • Erosion and sedimentation • Overflows in combined sewer systems • Pollution of receiving water bodies • Waste of a valuable resource

  7. A more sustainable approach

  8. A more sustainable approach (SUDS) • Structural SUDS (such as swales, ponds, porous paving and green roofs) • Non-structural SUDS (such as site planning, pesticide and fertiliser management, and public education and awareness raising campaigns) Options include:

  9. A more sustainable approach (WSUD) The concept of Water Sensitive Urban Design (WSUD): • Stormwater attenuation and retention • River restoration • Combining water infrastructure with landscape design • Embedding water management into existing urban and regional planning • Incorporating water recycling facilities into urban architecture

  10. Benefits of sustainable urban drainage solutions and WSUD • Flood control • Pollution control • Protection against erosion • Aquifer replenishment • Alternative source of water • Amenity value • Climate change adaptation

  11. Why the non-conventional approach is more sustainable Amenity value Reduced flood risk Protection and enhancement of natural habitats Reduced pressure on natural water supply sources Reduced treatment and pumping costs Reduced flood risk

  12. Structural SUDS

  13. Non-structural SUDS

  14. Acknowledgements This presentation has been produced as part of the SWITCH Training Kit by: Ralph Philip and Barbara Anton ICLEI – Local Government’s for Sustainability based on the joint efforts of the following SWITCH partners: Alison Duffy (University of Abertay), B. Ellis (Middlesex University), Chris Jefferies (University of Abertay), M. Revitt (Middlesex University), L. Scholes (Middlesex University), H. Sieker (Ingenieurgesellschaft Prof. Dr. SiekermbH), B. Shutes (Middlesex University), M. Soutter (Swiss Federal Institute of Technology (EPFL), J. Eckart (HafenCity University, Hamburg), W. Holste (Middlesex University), H. Langenbach (HafenCity University, Hamburg), G Schröder (HafenCity University, Hamburg), I. Wagner (Technical University of Lodz) The UNESCO-IHE led SWITCH project runs from Feb. 2006 to Jan. 2011 and is part-financed by Directorate General Research of the European Commission under the Sixth Framework Programme. For more information see www.switchurbanwater.eu

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