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Strategies for adaptation of urban drainage systems to climate change
by
Ole Mark, DHI
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Urban Stormwater Management Urban Stormwater Management in Developing Countriesin Developing Countries
Jonathan ParkinsonJonathan Parkinson
Ole MarkOle Mark
IWA Publishing
2005
www.iwapublishing.com
ISBN: 1-843390-57-4
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Relationships between areas of development, urban catchments and river basin
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Conceptual framework and operational structure for IWRM
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Main components of integrated urban water management
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Stormwater drainage - an integral component of urban environmental management
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The priorities of a city ?
1.Drinking water
2.Sanitation / sewers
3.Wastewater treatment & reduction of flooding
4.Reduction of pollution in recipients
5.Recreative values of water
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Dubai
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Excessive amounts of litter in a drainage channel in Dhaka
Source: Urban Stormwater Management in Developing Countries, 2005 Photo: Birgitte Helwigh
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Blocked inlet to the stormwater drainage system in Dhaka
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While waiting for the next flood in your city…
Karachi, Pakistan – 19th August 2006Power supply,telecommunication,moblie systems disrupted
Rain related death toll: 26Rain: 50-60 mm…..
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While waiting for the next flood in your city…
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Urban poor living on the banks of an urban river in Jakarta, Indonesia
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Causes and types of urban flooding
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Initial elevation grid
Grid with streets
Final grid with streets and buildings
Lowering by 20 cm places where there are
streets
Raising by 5 m places where there are buildings
Today, the model is a copy of the city….
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Modeling of flooding in cities
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What is flooded ?
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What does flooding cost ?
Direct Damages
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Traffic Planning
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Flood damage reduction
1. Land use planning
2. Reduction of the flood extent
3. Reduction of the interaction with the flood
4. Control of the surface runoff and subsequently flooded areas
5. Emergency plans and actions
6. Flood warning and information systems
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Wh
ile w
ait
ing
for
the n
ext
flood
in
you
r cit
y…
.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 ?
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Clim
ate
ch
an
ge
This should be avoided…
This was the control of a pumping station
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Flooding computed for a new “climate” 10 year rain
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The football field in Greve
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Flooding computed for a new “climate” 10 year rain
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The football field as flood strorage…
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Beijing – 2004
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Clim
ate
ch
an
ge
Informed decissions!!!
How should we handle extreme rain fall and
climate changes in the urban areas?
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Clim
ate
ch
an
ges
So while you are waiting for the climate changes and the next flood in your city – spend some time to think about:
1. What will be flooded ?
2. What will it cost ?
3.How can damages be reduced ?
4.Can you learn something from other places ?
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Clim
ate
ch
an
ges
Summary
• Analyses of urban flooding
• Climate & Risk/Hazard analyses
• Timely management (climate, planning, cost-
benefit, etc)
Today
In the future
Managment of climate changes
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