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Strategies for adaptation of urban drainage systems to climate change

Strategies for adaptation of urban drainage systems to climate change. by Ole Mark, DHI. Urban Stormwater Management in Developing Countries. Jonathan Parkinson Ole Mark. IWA Publishing 2005 www.iwapublishing.com ISBN: 1-843390-57-4.

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Strategies for adaptation of urban drainage systems to climate change

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  1. Strategies for adaptation of urban drainage systems to climate change by Ole Mark, DHI

  2. Urban Stormwater Management in Developing Countries Jonathan Parkinson Ole Mark IWA Publishing 2005 www.iwapublishing.com ISBN: 1-843390-57-4

  3. Relationships between areas of development, urban catchments and river basin

  4. Conceptual framework and operational structure for IWRM

  5. Main components of integrated urban water management

  6. Stormwater drainage - an integral component of urban environmental management

  7. The priorities of a city ? • Drinking water • Sanitation / sewers • Wastewater treatment & reduction of flooding • Reduction of pollution in recipients • Recreative values of water

  8. Dubai

  9. Excessive amounts of litter in a drainage channel in Dhaka Source: Urban Stormwater Management in Developing Countries, 2005 Photo: Birgitte Helwigh

  10. Blocked inlet to the stormwater drainage system in Dhaka

  11. While waiting for the next flood in your city… Karachi, Pakistan – 19th August 2006 Power supply,telecommunication,moblie systems disrupted Rain related death toll: 26 Rain: 50-60 mm…..

  12. While waiting for the next flood in your city…

  13. Urban poor living on the banks of an urban river in Jakarta, Indonesia

  14. Causes and types of urban flooding

  15. Final grid with streets and buildings Raising by 5 m places where there are buildings Grid with streets Lowering by 20 cm places where there are streets Initial elevation grid Today, the model is a copy of the city….

  16. Modeling of flooding in cities

  17. What is flooded ?

  18. What does flooding cost ? Direct Damages

  19. Traffic Planning

  20. Flood damage reduction • Land use planning • Reduction of the flood extent • Reduction of the interaction with the flood • Control of the surface runoff and subsequently flooded areas • Emergency plans and actions • Flood warning and information systems

  21. Do you believe in climate changes ? • Will a 10 year rain become a 2-3 year rain ?? 30 years => 5 years ? • Can/will we ”build” fast enough ?? • What do we do - When we get flooded ?

  22. This should be avoided… This was the control of a pumping station 

  23. Flooding computed for a new “climate” 10 year rain

  24. The football field in Greve

  25. Flooding computed for a new “climate” 10 year rain

  26. The football field as flood strorage…

  27. Beijing – 2004

  28. Informed decissions!!! How should we handle extreme rain fall and climate changes in the urban areas?

  29. So while you are waiting for the climate changes and the next flood in your city – spend some time to think about: • What will be flooded ? • What will it cost ? • How can damages be reduced ? • Can you learn something from • other places ?

  30. Analyses of urban flooding Climate & Risk/Hazard analyses Timely management (climate, planning, cost-benefit, etc) Managment of climate changes Summary Today In the future

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