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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 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
Relationships between areas of development, urban catchments and river basin
Stormwater drainage - an integral component of urban environmental management
The priorities of a city ? • Drinking water • Sanitation / sewers • Wastewater treatment & reduction of flooding • Reduction of pollution in recipients • Recreative values of water
Excessive amounts of litter in a drainage channel in Dhaka Source: Urban Stormwater Management in Developing Countries, 2005 Photo: Birgitte Helwigh
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…..
Urban poor living on the banks of an urban river in Jakarta, Indonesia
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….
What does flooding cost ? Direct Damages
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
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 ?
This should be avoided… This was the control of a pumping station
Informed decissions!!! How should we handle extreme rain fall and climate changes in the urban areas?
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 ?
Analyses of urban flooding Climate & Risk/Hazard analyses Timely management (climate, planning, cost-benefit, etc) Managment of climate changes Summary Today In the future